Abstract:
An external programming system and method for implantable medical devices (IMDs) is disclosed. The external programming system includes a communication circuit, a display device, an input device, and a processor. The communication circuit is configured to link to an IMD to transmit or monitor IMD timing parameter settings. The display device is configured to display a textual representation of an IMD timing parameter setting and a specified IMD timing parameter limit, a graphical slide control comprising a movable feature indicating the IMD timing parameter setting, a graphical slide-control limit corresponding to the specified IMD timing parameter limit, and a graphical representation of physiologic information including a portion of said graphical representation aligned with the slide control movable feature. The input device is configured to adjust the movable feature in response to user input. The processor is configured to monitor or store an IMD timing parameter setting.

Description:
RELATED APPLICATIONS 
     This application is a divisional of U.S. application Ser. No. 10/841,966, filed on May 6, 2004, now U.S. Pat. No. 7,272,444, which application is incorporated herein by reference, which claims the benefit of provisional application U.S. Ser. No. 60/468,946 filed on May 7, 2003, entitled “MEDICAL DEVICE INTERFACE SYSTEM AND METHOD”, Peterson et al. 
    
    
     FIELD OF INVENTION 
     The present invention relates to programming devices used to program implantable programmable medical devices, such as cardioverter-defibrillators and pacemakers. More particularly, but not by way of limitation, the present invention relates to improvements in the graphical user interface of the programmer devices, wherein the graphical user interface automatically communicates to the programming device user in real-time suggested changes in parameters in response to the user&#39;s modification of related parameters. The programming device graphical user interface improvements also include a method of preventing parameter modification that creates unsafe conditions. 
     BACKGROUND OF THE INVENTION 
     Implantable cardiac rhythm CRM devices, more specifically, cardiac defibrillators (ICDs) are well established therapeutic devices for treating patients who have experienced one or more documented episodes of hemodynamically significant ventricular tachycardia or ventricular fibrillation. Since their clinical inception more than two decades ago, ICDs have evolved from basic to sophisticated electronic devices that provide physicians with a variety of clinically useful functions with which to treat patients. 
     Presently, even the most basic ICDs typically have more than one tachycardia detection criterion, tiered therapy which combines bradycardia support pacing with various antitachycardia pacing modes, low-energy cardioversion, defibrillation, and data logging capabilities. The data logging capabilities within ICDs have become increasingly important, since the amount of data required for the ICDs operation increases proportionally with the increase in ICD functions. Efficiently processing this large amount of data has become possible with the incorporation of microprocessors and memory with the ICD. 
     Once an ICD has been implanted, the physician interacts with the ICD through a clinical programmer. The clinical programmer is used to establish a telemetric link with the implanted ICD. The telemetric link allows for instructions to be sent to the electronic circuitry of the ICD and clinical data regarding the occurrence and treatment of a patient&#39;s cardiac arrhythmias and the ICD&#39;s operation to be sent from the electronic circuitry of the ICD to the programmer. The typical programmer is a microprocessor based unit that has a wand for creating the telemetric link between the implanted ICD and the programmer, and a graphics display screen that presents a patient&#39;s recorded cardiac data and ICD system information to the physician. 
     As ICD feature sets become richer and more complex, ICDs are getting increasingly more complicated to program. This is especially the case in situations where modifications of one feature ripples through and interacts with other selected features. 
     For ICDs it can be very difficult for physicians to deal with non-compatibilities with programming. Such devices may have many features to program and, when physicians go in to program, there may be some inconsistencies that are not recommended by logic or by concerns for safety of the patient. In the past, these inconsistencies were displayed as error messages and the physician often had to wade through a series of screens to determine the nature of the inconsistency and how to resolve it. 
     In addition, physicians were frustrated by error messages, which note an interaction but did not tell them what to do resolve the problem. They were often reduced to trial and error programming which might create a second parameter interaction while resolving the first. 
     In addition, for devices currently on the market, device parameters are set by selecting from a list of possible options via the programmer. The options have typically been scattered throughout the programmer user interface. 
     What is needed is a more intuitive way for the physician to resolve parameter interactions and a user interface that allows related parameters to be displayed simultaneously to enhance physician resolution of such parameter interaction conflicts. 
     SUMMARY OF THE INVENTION 
     A medical device system having a medical device and a programming interface, wherein the programming interface provides a method of automatically adjusting parameters to be programmed to a medical device in direct response to a user modifying related parameters that are to be programmed to the medical device. The programming interface is comprised of a graphical user interface including slide controllers that are engaged on the display screen by the system user to graphically modify related parameters on screen. In response to the on screen parameter changes implemented by the user via slide controller movement, the programmer automatically adjusts related parameters on the display screen by moving slide controllers for related parameters. This automatic adjustment by the programmer graphically illustrates to the user the automatic adjustments being made to the related parameters, which thereby prevent the creation of unsafe conditions. The automatic adjustment also graphically illustrates the relationship between parameters being adjusted by the programmer user and the related parameters that are automatically adjusted by the programmer. In response to on screen parameter changes, the system graphically illustrates the parameter values that are changed and those that are programmed to the medical device and those that would cause unsafe condition in the medical device if programmed. 
     These and various other features, as well as advantages, which characterize the present invention, will be apparent from a reading of the following detailed description and a review of the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings, which are not necessarily drawn to scale, like numerals describe substantially similar components throughout the several views. Like numerals having different letter suffixes represent different instances of substantially similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document. 
         FIG. 1  is an embodiment of an implantable cardiac defibrillator implanted into a heart of a patient, from which portions have been removed to show detail; 
         FIG. 2  illustrates a perspective view of an external programming unit according to one embodiment of the present invention that is used for communicating with the defibrillator of  FIG. 1 ; 
         FIG. 3  illustrates one embodiment of an implantable cardiac defibrillator medical device system according to the present invention; 
         FIG. 4  illustrates one embodiment of a display of a graphical user interface of the external programming unit of  FIG. 3  for use in setting and adjusting rate thresholds of an implantable cardiac defibrillator; 
         FIG. 5  illustrates one embodiment of a display of a graphical user interface of the external programming unit of  FIG. 3  for use in adjusting and visualizing device timing of an implantable cardiac defibrillator; and 
         FIG. 6  illustrates one embodiment of a display of a graphical user interface of the external programming unit of  FIG. 3  for use in adjusting and visualizing device timing of an implantable cardiac defibrillator. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific embodiments or examples. These embodiments may be combined, other embodiments may be utilized, and structural, logical and electrical changes may be made without departing from the spirit and scope of the present invention. The following detailed description is therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims and their equivalents. 
     The present invention is an improved graphical user interface of a programmer used within a medical device system, wherein the medical device system is comprised of a medical device and a medical device programmer. The medical device programmer provides a method for automatically adjusting rate threshold parameters to be programmed to a medical device in direct response to a user modifying related rate threshold parameters that are to be programmed to the medical device. The programmer graphical user interface utilizes slide controllers that are engaged on the display screen by the system user to modify rate threshold parameters. In response to the on screen rate threshold parameter adjustments implemented by the user via slide controller movement or engaging a pop-up menu that includes a plurality of numbers that are displayed upon engagement of the rate control window within each slide controller. The programmer automatically adjusts related rate threshold parameters on the display screen by automatically moving slide controllers for related threshold parameters. This automatic adjustment by the programmer graphically illustrates to the user the automatic adjustments being made to the related rate threshold parameters by the programmer. The automatic responsive adjustment function that adjusts related rate threshold parameters in response to user parameter adjustments is controlled by programmer rules that dictate levels and ranges for related threshold rates so as to prevent the creation of unsafe conditions caused by conflicts in the parameters. The automatic responsive adjustment function also graphically illustrates the relationship between rate threshold parameters being adjusted by the programmer user and the related rate threshold parameters that are automatically adjusted by the programmer. 
     Another aspect provided by the improved graphical user interface is the ability of the programmer to provide for the graphical setting, adjusting and visualizing of device timing behavior. The improved graphical user interface provides the programmer user with the ability to graphically communicate how cardiac conditions relate to particular parameters as the user adjusts parameters such as Atrioventricular delay (AV delay), left ventricular offset (LV offset), post-ventricular atrial refractory period (PVARP) right ventricular refractory period (RVRP), and left ventricular refractory period (LVRP). It also allows the programmer user with the ability to graphically resolve potentially unsafe conditions and undesirable states resulting from the adjustment of parameters. It further allows the user to visualize the graphic relationship between timing parameters such as AV delay, LV offset, PVARP, RVRP and LVRP while facilitating the user&#39;s ability to graphically adjust the atrial and ventricular timing settings using parameter control sliders. It also uses color codes to illustrate the relationship between different atrial and ventricular timing settings. 
     The present system and methods are described with respect to implantable cardiac rhythm management (CRM) devices, such as pacemakers, cardioverter defibrillators (ICDs), pacer/defibrillators, and multi-chamber and/or multi-site (in a single chamber or multiple chambers) cardiac resynchronization therapy (CRT) devices that utilize standard pacing and defibrillating leads. Notwithstanding, it is contemplated that the present invention and methods may be used in alternative embodiments with CRM devices that are not using standard pacing and defibrillating leads or with CRM devices that are leadless. 
       FIG. 1  illustrates a medical device system  10  including a medical device programmer  12  and a medical device  20 . The programmer  12  includes a processor, memory and a program module for controlling an improved graphical user interface feature that allows a user to adjusts rate thresholds while graphically illustrating the relationship between the rate thresholds the user changed and rate thresholds that are automatically changed by the programmer in response to the rate threshold adjustments made by the user. The programmer  12 , illustrated in  FIG. 2  also includes an input device  14  and a display  18  and is connected to a medical device via communications link  34 , as shown in  FIG. 1 . In the present embodiment, the communications link  34  is established by the programmer&#39;s telemetry system  30  and the medical device&#39;s telemetry system  32 . In one embodiment, the medical device system is an implantable shock therapy system. An example of such a system is shown in  FIG. 3 . Medical device  20  generally includes its control unit  20  and implantable leads  22  and  24 , coupled to the unit  20 . The leads  22  and  24  are, in turn, introduced into the heart  50 , as described below. As also described in more detail below, the medical device  20  may be implanted or may be used as an external device. 
     The implantable leads  22  and  24  may comprise elongated bodies, having a proximal end  28  and  26 , respectively, and a distal end  60  and  64 , respectively. The implantable leads  22  and  24  may include one or more acceleration sensor units  66 , respectively, and may further include one or more pacing/sensing electrodes  68  and  70 , respectively. The electrodes  68  and  70  can be used to sense electrical activity or provide electrical stimulation to the heart tissue adjacent to the electrodes 
     Each lead  22  and  24  has an inner lumen  25  and  27 , and the acceleration sensor unit  66  may be positioned within the lumens  25  and  27  of each lead. A suitable lead for this purpose is the easy track from Guidant Corporation. Suitable miniaturization accelerometers having a diameter of approximately 1 millimeter available from Ball Semiconductor, Inc. (see U.S. Pat. No. 6,197,610) and others, and these miniaturization accelerometers may be positioned within the inner lumen of the easy track lead and positioned adjacent the lead electrode after the lead has been properly positioned on or within the heart  500 . Accelerometer(s) may be positioned in the lumen of the lead within the coronary sinus vein, if desired, thereby minimizing the invasiveness of the accelerometer implantation. 
     As illustrated in  FIG. 2 , the programmer  12  includes an input device  14  such as a touch screen pen or mouse, a display  18  and a telemetry system. Features and threshold parameters selected or programmed by physicians into programmer  12  are communicated through telemetry link  30  to the medical device  20  via communication link  32 , as illustrated in  FIG. 1 . The medical device  20  controls how shock and pacing therapy are applied to the patient&#39;s heart. 
     Programmer  12  includes an automatic responsive adjustment function that adjusts related rate threshold parameters of CRM devices while graphically illustrating the relationship between the rate thresholds adjustments on the programmer display  18 . The method implemented by programmer  12  provides a user with a means to graphically modify rate thresholds while the programmer itself processes each rate threshold change and automatically modifies related parameters that need to be changed in order to prevent conflicts among related parameters when changes are made. 
     In one embodiment, the programmer&#39;s automatic responsive adjustment function and an interactive programming feedback feature are designed to assist the user in programming the medical device appropriately. In one such embodiment, a set of rules governs the number of possibilities that the various parameters may be programmed to. The rules ensure that incompatibilities among features are identified and prevented and that programming conflicts cannot exist. In one such embodiment, if a user attempts to program a parameter in such a way that may cause incompatibility among features, the programmer  12  automatic responsive adjustment function and interactive programming feedback feature automatically modifies related parameters that need to be changed in order to prevent conflicts in the parameters. In addition, because the programming interface is graphical, the programming interface provides a visual indication on the respective programmer display  18  that informs the user of the changes being made to parameters being changed by the user. It also provides a visual indication on the respective display  18  that informs the user of the automatic changes that occur with related parameters automatically modified in response to the changes being made to selected parameters by the user. The programmer automatically causes changes in related parameters so that the medical device parameter sets remain clear of conflicts. 
     In some instances, parameter modifications that may cause programming conflicts are not automatically modified by the programmer automatic responsive adjustment function. Under this circumstance, the interactive programming feedback function provides a visual indication on the respective display that informs the user of the programming conflict between parameters. 
     A graphical user interface display, which includes the automatic responsive adjustment function and interactive programming feedback feature may be used to set and adjust rate thresholds in ICDs and defibrillators, is shown in  FIG. 4 . The display shown in  FIG. 4  is geared toward the defibrillator system shown in  FIG. 1  but can be generalized to control any medical device  20 . In the embodiment shown in  FIG. 4 , the graphical user interface display illustrates that the programmer interface includes seven rate grabbers, Ventricular Fibrillation (VF), Ventricular Tachycardia (VT), Ventricular Tachycardia (VT-1), Atrial Fibrillation (AF), Maximum Sensor Rate (MSR), Maximum Tracking Rate (MTR) and Lower Rate Limit (LRL). Of the seven rate grabbers, three of them are in the ventricle zone (VF, VT, VT-1) and one of them AF is in the atrial zone. In this embodiment, the three ventricular zones (VF, VT, VT-1) and the single atrial zone (AF) are tachyarrhythmia zones. The graphical user interface  100  allows the number of zones in the ventricles to be modified and selectively toggled between single zone, dual zone and three zones. This feature is accomplished by the interactive ventricle zone button  116 , which allows for the selection of the number of ventricle zones ranging from one to three. In the present embodiment, a single zone ventricle configuration would comprise a VF zone, and a dual zone ventricle configuration would comprise VF and VT zones. It is to be understood that the invention can use any number of rate grabbers. For example, an alternative embodiment may include more or less than seven rate grabbers. If eight rate grabbers are used in an alternative embodiment, the seven rate grabbers previously identified and are utilized along with an AT rate grabber. 
     Interface for Setting and Adjusting Rate Thresholds 
     As illustrated in  FIG. 4 , each ventricular zone is identified on display  100  by colored windows  120 ,  124 , and  128 , which are all different colors. Colored window  120  represents the VF zone. Colored window  124  represents the VT zone, and colored window  128  represents the VT-1 zone. Adjacent to the edge of each colored window  120 ,  124 , and  128  are parameter slide controllers  122 ,  126  and  130 . Parameter slide controllers  122 ,  126  and  130  are the graphical control mechanisms that the system user engages to control threshold settings for VT-1, VT and VF. In the embodiment shown in  FIG. 4  the threshold rate for VT-1 is 125 bpm, the threshold rate for VT is 145 BPM and the threshold rate for VF is 165 BPM. The threshold rates for VT-1, VT and VF (125 BPM, 145 BPM and 165 BPM) are illustrated in the rate windows on parameter slide controllers  122 ,  126  and  130 . The rate windows of the slide controllers (VT)  122 , (VF)  126 , (VT-1)  130 , (AF)  142 , (MSR)  134 , (MTR)  140 , and (LRL)  136  has a white background that indicates to the user that the threshold rates illustrated in the slide controller rate windows are threshold rates currently programmed in the medical device. The threshold rates within the rate windows on parameter slide controllers  122 ,  126  and  130  are modified by sliding the parameter slide controllers  122 ,  126  and  130  up and down vertically. When threshold rates are adjusted, the background of the slide controller rate window changes to a different color to indicate that the threshold rate illustrated in the window is a proposed rate that has not be programmed. In the present embodiment, the background of the slide controller rate window changes to green to illustrate that a threshold rate adjustment has been made. It is to be understood that the background or the actual text within the slide controller rate window may be changed to any color so long as the colors indicate that the rates have been adjusted. In addition to the background of the slide controllers (VT)  122 , (VF)  126 , (VT-1)  130 , (AF)  142 , (MSR)  134 , (MTR)  140 , and (LRL)  136  changing to a different color when the threshold rates for VT, VF, VT-1, AF, MSR, MTR and LRL are adjusted, the threshold rates for VT, VF, VT-1, AF, MSR, MTR and LRL programmed into the medical device (the threshold rate displayed in the slide controller prior to modification) are displayed in parenthesis in close proximity to the slide controller to illustrate to the user the threshold rate currently programmed into the medical device. 
     Movement of parameter slide controllers  122 ,  126  and  130  vertically upward causes threshold settings for VT-1, VT and VF to be increased and such increase is reflected within the rate control windows on the parameter slide controllers  122 ,  126  and  130 . Movement of parameter slide controllers  122 ,  126  and  130  vertically upward also causes the size of the colored windows  120 ,  124  and  128  to be decreased or remain the same. Movement of parameter slide controllers  122 ,  126  and  130  vertically downward causes threshold settings for VT-1, VT and VF to be decreased and such decrease is reflected within the rate windows on the parameter slide controllers  122 ,  126  and  130 . It also causes the size of the colored windows  120 ,  124  and  128  to be increased or remain the same. If the parameter slide controller  130  is adjusted by the system user or automatically in response to the automatic responsive adjustment function whereby the threshold rate of VT-1 is reduced to a rate that is within a predetermined range of the maximum sensor rate or maximum tracking rate thresholds displayed, the automatic responsive adjustment function causes automatic adjustment of the maximum sensor rate and/or maximum tracking rate via parameter slider controllers  134  and  140 . In the present embodiment, the predetermined range is 5 Bpm in accordance with programmer rules that require a range of at least 5 Bpm between the threshold rate of VT-1 and the thresholds for the maximum sensor rate and maximum tracking rate. It is to be understood that the predetermined range may vary and is dependent upon the level of safety the programmer rules are implementing into the automatic responsive adjustment function. 
     It is to be understood that the predetermined range may be set at any range necessary for the system to accomplish the automatic responsive adjustment function. Parameter slide controllers  134  and  140  are automatically moved to adjust the maximum sensor rate and/or maximum tracking rate thresholds to rates that are consistent with the rules and do not cause parameter conflicts. In the embodiment illustrated in display  100 , the maximum sensor rate and/or maximum tracking rate thresholds are adjusted so that the threshold rates are at least 5 Bpm less than the threshold rate of VT-1. If adjustment of the maximum sensor rate and/or maximum tracking rate thresholds downward causes the maximum sensor rate and/or maximum tracking rate thresholds to be within a predetermined range of the lower rate limit, the automatic responsive adjustment function adjusts the lower rate limit threshold downward. In the present embodiment, the predetermined range is 15 Bpm in accordance with programmer rules that require a range of at least 15 Bpm between the lower rate limit threshold and the thresholds for the maximum sensor rate and maximum tracking rate. It is to be understood that the predetermined range may vary and is dependent upon the level of safety the programmer rules are implementing into the automatic responsive adjustment function. 
     During movement of parameter slide controllers  122 ,  126  and  130  to adjust the threshold settings for VT-1, VT and VF, if an attempt is made to change one of the threshold settings for VT-1, VT and VF to a level where the difference between setting rates of VT-1 and VT and VT and VF have ranges that are less than minimum ranges set by programmer rules that control engagement of the automatic responsive adjustment feature, the automatic responsive adjustment feature engages. In the present embodiment, the minimum ranges set for difference between the threshold setting rates of VT-1 and VT and VT and VF is 20 beats per minute (Bpm). The automatic adjustment feature engages upon the adjustment of threshold settings for VT-1, VT and VF via movement of parameter slide controllers  122 ,  126 ,  130  vertically upward or downward, when the resulting difference between VT-1 and VT and/or VF and VF is less than 20 Bpm. 
     By way of example, the automatic responsive adjustment feature engages as a result of the threshold level for VT-1 being increased to a level that would cause the difference in threshold levels between VT-1 and VT to be smaller than 20 Bpm. When the automatic responsive adjustment feature engages, it causes VF to increase to a level wherein the threshold level for VF is equal to VT plus the minimum range set by program rules. Or, in the present embodiment, VF is equal to the new threshold level set for VT plus 20 Bpm. In addition, the automatic responsive adjustment feature engages as a result of the threshold level for VF being lowered to a level that would cause the difference in threshold levels between VT and VF to be smaller than the minimum range set by programmer rules that control engagement of the responsive adjustment feature (20 Bpm). When the automatic responsive adjustment feature engages, it causes VT to be automatically lowered to a level wherein the threshold level for VT is 20 Bpm lower than the new threshold level for VF. The automatic responsive adjustment feature also engages as a result of the threshold level for VT-1 being increased to a level that would cause the difference in threshold levels between VT-1 and VT to be smaller than the minimum range set by programmer rules that control engagement of the automatic responsive adjustment feature (20 Bpm). When the automatic responsive adjustment feature engages, it causes VT to increase to a level wherein the threshold level for VT is 20 Bpm greater than the new threshold level for VT-1. In addition, the automatic responsive adjustment feature engages as a result of the threshold level for VT being lowered to a level that would cause the difference in threshold levels between VT-1 and VT to be smaller than the minimum range set by programmer rules that control engagement of the automatic responsive adjustment feature (20 Bpm). When the automatic responsive adjustment feature engages, it causes VT-1 to be automatically lowered to a level wherein the threshold level for VT-1 is 20 Bpm lower than the new threshold level for VT. 
     The atrial zone illustrated in display  100  is also shown to have threshold rates defined by a colored window  144  and a parameter slide controller  142 . Colored window  144  represents the AF zone. Adjacent to the edge of colored window  144  is a parameter slide controller  142  that the user engages to control the threshold settings for AF. As illustrated in  FIG. 4 , the threshold rate for AF, as illustrated in the rate window of parameter slide controller  142 , is 170 Bpm. The AF threshold may be modified by moving the parameter slide controller  142  upward to increase the threshold level and downward to decrease the threshold level. If the parameter slide controller  142  is adjusted by the system user and the resulting threshold rate of AF is reduced to a threshold rate that is within a predetermined range of the maximum sensor rate or maximum tracking rate thresholds displayed, the automatic responsive adjustment feature engages and causes automatic adjustment of the maximum sensor rate and/or maximum tracking rate via parameter slider controllers  134  and  140  so that the AF threshold rate remains at least at a predefined level as defined by program rules higher than the maximum sensor rate and maximum tracking rate. In the present embodiment, the predetermined range is 5 Bpm, and in accordance with programmer rules there is a required range of at least 5 Bpm between the resulting threshold rate of AF and the resulting maximum sensor rate and maximum tracking rate. Parameter slide controllers  134  and  140  are automatically moved to adjust the maximum sensor rate and/or maximum tracking rate thresholds to rates that are consistent with the rules so as to prevent parameter conflicts. In the embodiment illustrated in display  100 , the maximum sensor rate and/or maximum tracking rate thresholds are automatically adjusted downward so that the threshold rates are at defined level less than the threshold rate of AF. In the present embodiment, the maximum sensor rate and/or maximum tracking rate thresholds are automatically adjusted downward so that the threshold rates are at least 5 Bpm less than the threshold rate of AF. If adjustment of the maximum sensor rate and/or maximum tracking rate thresholds downward via movement of parameter slide controllers  134  and  140  or adjustment of the lower rate limit upward via movement of parameter slide controller  136  causes the maximum sensor rate and/or maximum tracking rate thresholds to be within a range defined by programmer rules of the lower rate limit threshold rate, the automatic programming function adjusts the lower rate limit threshold downward or the maximum sensor rate and maximum tracking rate upward, maintaining a threshold range in accordance with the range defined by the programmer rules between the lower rate limit and the maximum sensor rate and maximum tracking rate. In this embodiment the range set by programmer rules is 15 Bpm. The programmer rules require a range of at least 15 Bpm between the lower rate limit threshold and the thresholds for the maximum sensor rate and maximum tracking rate. 
     When the AF threshold level is increased, the size of colored window  144  becomes smaller. When the AF threshold level is decreased, the size of the colored window  144  becomes larger. The graphical user interface  100  further allows the number of atrial zones to also be modified and selectively toggled between single zone and dual zones. The present embodiment is a single zone atrial configuration that includes an AF zone only. Alternatively, engaging interactive atrial zone button  118  allows for the selection of two alternative dual zone sets. A first atrial zone set being comprised of AF and AT and a second atrial zone set being comprised of AF Rhythm and AT. 
     The graphical user interface  100  also provides rate grabbers for Brady threshold rates for the ventricle and atrial zones. The Brady threshold rates are comprised of the maximum sensor rate, maximum tracking rate and lower rate limit. The maximum sensor rate, illustrated by a first edge of the maximum sensor rate colored window  132 , has a parameter slide controller  134  adjacent the first edge. The parameter slide controller  134  includes a rate window that also illustrates a maximum sensor threshold rate. The threshold rate illustrated within the rate window of parameter slide controller  134  may be the rate currently programmed in the medical device, if the background of the rate window is white, or it would reflect a new threshold that has not be transmitted to the medical device if the background of the rate window is green. It is to be understood that the feature of changing the background of the rate window of parameter slide controllers applies to all slide controllers of this invention, and is not to be limited by colors being used. The concept of advising the user as to whether the parameter illustrated in the rate window is already programmed in the medical device or one that may be programmed in the feature or of the important features. The maximum tracking rate  140 , illustrated by a first edge of the colored window  138 , has a parameter slide controller  140  adjacent the first edge. The parameter slide controller  140  includes a rate window that also illustrates a maximum tracking threshold rate. The lower rate limit is illustrated by a parameter slide controller  136  that is adjacent a second edge of the maximum sensor rate colored window  132  and a second edge of the maximum tracking rate colored window  138 . The Brady threshold upper rate limit is the higher threshold rate of the maximum sensor rate and maximum tracking rate, reflected in the first edge or in the rate window of parameter slide controllers  134  and  140 . 
     As illustrated in  FIG. 4 , the maximum sensor rate  132  and the maximum tracking rate  138  are both 120 Bpm. Both the maximum sensor rate  132  and the maximum tracking rate  138  may be increased or decreased by sliding the parameter slide controllers  134  and  140  vertically upward or downward. The programmer rules that control engagement of the automatic responsive adjustment feature governs interaction of maximum sensor rate  132  and maximum tracking rate  138  and controls the range within which the maximum sensor rate  132  and maximum tracking rate  138  may be adjusted. In this embodiment, the maximum sensor rate  132  may be increased or decreased by sliding the parameter slide controller  134  vertically upward or downward until it reaches a maximum or minimum defined by program rules. In this embodiment, the maximum sensor rate may be increased up to a point at which the threshold rate is at least 5 Bpm less than VT-1 (125 Bpm) or, in the present embodiment 120 Bpm. Accordingly, in the embodiment illustrated in  FIG. 4 , the maximum sensor rate parameter slide controller  134  may not be adjusted upward to increase the maximum sensor rate as it is already at its highest level possible within the program rules. The automatic responsive adjustment feature, in accordance with the rules, will not allow the maximum sensor rate to be increased because an increase of the maximum sensor rate to a threshold rate that is within 5 BP of the threshold rate of VT-1 would cause parameter conflicts. To prevent such conflicts, the automatic responsive adjustment feature prevents such an adjustment. Notwithstanding, in an alternative embodiment, wherein the threshold rate of VT-1 has been removed from the display and only two zones VT and VF are illustrated in display  100 , the maximum sensor rate could be increased via slider  134  up to 140 Bpm. Upon the maximum sensor rate reaching 140 Bpm, the parameter control slider  134  is not allowed to move upward any further. Under no circumstance does the automatic responsive adjustment feature allow an increase of the maximum sensor rate to adjust the threshold rates of VF, VT and VT-1. The maximum sensor rate may only be increased to a threshold rate that is at least 5 Bpm less than the smaller of the threshold rates for VF, VT and VT-1. The maximum sensor rate may be decreased to a minimum level set by program rules by moving the parameter slide controller  134  downward. 
     Similar to the maximum sensor rate, the maximum tracking rate  138  may also be increased or decreased by sliding the parameter slide controller  140  vertically upward or downward. In this embodiment, the maximum tracking rate may be increased up to a point at which the threshold rate is at least 5 Bpm less than VT-1 (125 Bpm) or, in the present embodiment 120 Bpm. Accordingly, in the embodiment illustrated in  FIG. 4 , the maximum tracking rate parameter slide controller  140  may not be adjusted upward to increase the maximum sensor rate as it is already at its highest level possible within the rules. The automatic responsive adjustment feature, in accordance with the rules, will not allow the maximum tracking rate to be increased because an increase of the maximum tracking rate to a rate that is within 5 Bpm of the threshold rate of VT-1 would cause parameter conflicts. To prevent such conflicts, the automatic responsive adjustment feature prevents such an adjustment. Notwithstanding, in an alternative embodiment, wherein the threshold rate of VT-1 has been removed from the display and only two zones VT and VF are illustrated in display  100 , the maximum tracking rate could be increased via slider  140  up to 140 Bpm. Upon the maximum tracking rate reaching 140 Bpm, the parameter control slider  140  is not allowed to move upward any further. Under no circumstance does the automatic responsive adjustment feature allow an increase of the maximum tracking rate to adjust the threshold rates of VF, VT and VT-1. The maximum tracking rate may only be increased to a threshold rate that is at least 5 Bpm less than the smaller of the threshold rates for VF, VT and VT-1. The maximum tracking rate may be decreased to a minimum level set by program rules by moving the parameter slide controller  140  downward. 
     In the embodiment illustrated in display  100 , the maximum sensor rate and maximum tracking rate colored windows  132  and  138  may decreased by sliding lower rate limit parameter slide controller  136  upward until the lower rate limit reaches 105 Bpm. This reflects that the maximum sensor rate and maximum tracking rate range colored windows  132  and  138  are only 15 Bpm each. The programmer rules require a range of at least 15 Bpm between the lower rate limit threshold and the thresholds for the maximum sensor rate and maximum tracking rate. Accordingly, in the embodiment illustrated in  FIG. 4 , the lower rate limit parameter slide controller  136  may not be adjusted upward to increase the lower rate limit threshold as it is already at its highest level possible within the rules. The automatic responsive adjustment feature, in accordance with the rules, will not allow the lower rate limit threshold to be increased because an increase of the lower rate limit threshold to a threshold rate that is less than 15 Bpm would cause parameter conflicts. To prevent such conflicts, the automatic responsive adjustment feature prevents such an adjustment. Notwithstanding, in an alternative embodiment, wherein the threshold rate of VT-1 has been removed from the display and only two zones VT and VF are illustrated in display  100 , the lower rate limit threshold could be increased via parameter control slider  136  up to 125 Bpm. Moving of lower rate limit parameter control slider  136  up to 125 Bpm causes the automatic responsive adjustment feature to automatically adjust the maximum sensor rate and maximum tracking rate thresholds upward via automatic movement of the maximum sensor rate and maximum tracking rate parameter slide controllers  134  and  140 . Upon the maximum sensor rate and maximum tracking rate reaching threshold rates of 140 Bpm, the parameter control sliders  134  and  140  are not allowed to move upward any further. Under no circumstance does the automatic responsive adjustment feature allow an increase of the maximum tracking rate to adjust the threshold rates of VF, VT and VT-1. The maximum tracking rate may only be increased to a threshold rate that is at least 5 Bpm less than the smaller of the threshold rates for VF, VT and VT-1. The maximum tracking rate may be decreased to a minimum level set by program rules by moving the parameter slide controller  140  downward. 
     Display  100  includes colored display windows  120 ,  124 ,  128 ,  132 ,  138 ,  144 , that are comprised of at least three distinct colors, one color for the atrial, one for the ventricle and one for Brady. In the present embodiment, the colored display windows  120 ,  124 , and  128  for ventricle zones VF, VT and VT-1 are comprised of different shades of a color to reflect that there are three separate and discreet zones in the ventricle. In an alternative embodiment in which the Atrial Zone is comprised of two zones, AF and AT, AF and AT are comprised of different shades of a color to reflect that there are two separate and discreet zones. 
     On the right-hand side of display  100 , therapy summary areas for ventricular tachy therapy, atrial tachy therapy and Brady therapy are illustrated in summary areas  171 ,  173  and  175 . Ventricular tachy summary area  171  displays the patient scheme, mode and rate for each of the three zones VF, VT and VT-1 at  150 ,  152  and  154 . Additional ventricular tachy parameter settings may be viewed and changed by selecting the detection or therapy buttons  156  and  158 . 
     Atrial tachy summary area  173  illustrates the pacing mode and rates within the atrial zones. In the embodiment illustrated in display  100 , the atrial tachy therapy summary illustrates the pacing modes and rates within the atrial zones  141 ,  143  and  145 . Additional atrial tachy parameter settings may be viewed and changed by selecting the detection management button  160 , therapy management button  162  or arrhythmia management button  164 . The Brady therapy summary area  175  illustrates the normal and post-shock Brady cardio modes, rates, and outputs  180 ,  182  and  184 . Additional Brady cardio parameters settings may be viewed and changed by selecting the Brady cardio normal settings button  170 , the post shock settings button  172 , and the timing cycles button  174 . 
     In the embodiment shown in  FIG. 4 , the ECG display  110 ,  112  and  114  is always visible. The ECG display  110 ,  112 ,  114  shows real time surface ECG traces, as well as real-time electro grams, which are useful in ascertaining system performance. 
     In one embodiment, real-time electro grams can be transmitted from the pace/sense or shocking electrodes to evaluate lead system integrity such as lead fractures, insulation breaks, or dislodgments. 
     As illustrated in  FIG. 4 , the graphical user interface display  100  illustrates the threshold settings in beats per minute in accordance with the scale positioned in proximity to the colored windows  120 ,  124 , and  128  and parameter slide controllers slide controllers  122 ,  126 ,  130 ,  142 ,  134 ,  140 , and  136  along the left side of graphical user interface  100 . The scale along the left side of graphical user interface  100  may be modified and illustrated in time as milliseconds by engaging the scale modification button  135 . Engaging the scale modification button also changes the values inside the slide controller windows to be reflective of intervals instead of rate.  FIG. 4A  illustrates display  100  wherein the scale modification button  135  has been engaged and the values inside the slide controller windows are reflective of intervals. 
     Interface for Setting, Adjusting and Visualizing Device Timing Behavior 
     In order to understand and analyze a cardiac cycle in a heart, it is common to break the cardiac cycle down into its composite parts. Display  400  assists in the understanding of the cardiac cycles of the heart by illustrating the respective timing intervals of the cardiac cycle and how the timing intervals interrelate with each other. 
     Referring to  FIGS. 5 and 6 , is another illustration of a graphical user interface display  400  wherein the programmer utilizes the automatic responsive adjustment feature. Display  400  is used for setting, adjusting and graphically visualizing device timing behavior and the relationship between different timing parameters. It also prevents certain timing behavior in an implantable medical device from being set to an unsafe or undesirable condition. It also provides the programmer user with the ability to graphically communicate how cardiac conditions relate to particular parameters as the user adjusts parameters such as Atrioventricular delay (AV delay), left ventricular offset (LV offset), post-ventricular atrial refractory period (PVARP) right ventricular refractory period (RVRP), and left ventricular refractory period (LVRP). It also allows the programmer user to graphically resolve potentially unsafe conditions and undesirable states resulting from the adjustment of parameters. It further allows the user to visualize the graphic relationship between timing parameters such as AV delay, LV offset, PVARP, RVRP and LVRP while facilitating the user&#39;s ability to graphically adjust the atrial and ventricular timing settings using parameter control sliders. When the timing parameters are adjusted by the parameter slide controllers, the timing behavior including sensing windows and blanking periods will also be graphically displayed. Display  400  also uses color codes to illustrate the relationship between different atrial and ventricular timing settings and the status of the certain parameter changes. With certain parameter changes, the change is illustrated with a green background because it is a safe. Other parameter changes are illustrated with a yellow background to illustrate that the proposed change are undesirable and with a red background to illustrate that the proposed changes are unsafe. Yellow is to warn the user and red is to indicate that an error will occur if an attempt is made to program the parameters illustrated. Under these circumstances, the programmer automatically indicates recommended changes to overcome the undesirable or unsafe conditions. 
     Display  400  includes an AV delay area  401 , an LV offset area  410 , a PVARP display area  420 , an RVRP display area  430  and an LVRP display area  440 . Each display area, including LV delay area  401 , an LV offset area  410 , an PVARP display area  420 , an RVRP display area  430  and an LVRP display area  440 , illustrates timing settings and includes parameter slide controllers for adjusting the timing settings graphically. The AV display area  401  illustrates the timing setting associated with the AV delay timing interval and includes a graphical user interface for adjusting the minimum and maximum values for AV delay. Although not to scale, it also includes a graphical representation of the AV delay timing cycle in relation to the LV offset, PVARP, RVRP and LVRP timing settings. The adjustments to AV delay are accomplished by movement of parameter slide controllers  402  and  403  to the appropriate timing settings. The adjusted or programmed parameters of the AV delay are illustrated in the parameter slide controller rate windows  404  and  405 . 
     The atrial pulse indicator line  510  illustrates the beginning of the AV delay period, which ends at the Right Ventricular Pulse (RVP) indicator line  520 . The graphical representation of the AV delay timing cycle is further reflected in the adjustment guide  407  which is a graphical display of the AV delay timing cycle shown in relation to the timing cycles for, LV offset, PVARP, RVRP and LVRP. When it is desired to adjust the minimum and/or maximum rates for the AV delay, parameter slide controllers  402  and  403  are moved horizontally along the adjustment guide  407 . Movement of parameter slide controllers  402  and  403  causes the parameters illustrated within the parameter slide controller rate windows  404  and  405  to be adjusted. Movement of parameter slide controller  403  also causes the movement of the Right Ventricular Pulse (RVP) indicator line  520 . The RVP indicator line  520  is representative of the beginning of the right side of the timing interval. It may be reflective of a sensed ventricular event (R wave) or a ventricular pace. 
     It can be seen in display  400  that the AV delay minimum illustrated in the parameter slide controller rate window  404  in display  400  is 10 milliseconds. The AV delay maximum has been adjusted to 300 milliseconds by movement of parameter slide controller  403 . The user is automatically advised that the 300 milliseconds illustrated in the parameter slide controller rate window  405  is not the AV delay maximum parameter that is programmed into the medical device because the background of the rate window  405  is green. Whenever the user of the programmer&#39;s graphical user interface adjusts parameters within the parameter slide controllers, the background of the parameter slide controller rate window changes to another color. In the present embodiment, the background is white when the parameter within the parameter slide controller rate window reflects the value previously programmed to the medical device. The background is green when the parameter within the parameter slide controller rate window is a non-conflicting parameter that has not been programmed to the medical device. The background is red when the parameter within the parameter slide controller rate window is a conflicting parameter with another parameter. In instances where the parameter slide controller rate window displays a parameter that conflicts with other parameters and thereby may cause an unsafe condition, the program rules prevent the transmission of such a parameter to the medical device. As illustrated in  FIG. 6 , display  400  also provides the user with the ability to view the changes by engaging the view changes button  490  and the ability to seek help regarding the conflicting parameters by engaging the help button  492 . 
     Regarding the maximum AV delay, the medical device is sensing for a P wave from the atrial pulse indicator line  510  following the occurrence of the Atrial pulse  512  up to Right Ventricular Pulse (RVP) indicator line  520  or for up to 300 milliseconds. If a P wave is sensed prior to completion of 300 milliseconds, the sensed ventricular event is used as a basis for all other interval timing. That sensed event acts as the beginning of the timing intervals for the LV offset, the PVARP, RVRP and LVRP refractory periods, and the overall cardiac cycle intervals which end at the lower rate limit (LRL). Because all timing is based off ventricular to ventricular events, if something is sensed within the AV delay interval, or in the example illustrated in display  400  within 300 milliseconds, then that is the beginning of a new cycle. If a ventricular pulse is not sensed within 300 milliseconds, then the medical device will send a pulse to the right ventricle of the heart at 300 milliseconds as illustrated by Right Ventricular Pulse (RVP) indicator line  520 . Under this circumstance, the Right Ventricular Pulse (RVP) indicator line  520  is used as the base timing for all other interval timing because an R wave will not have been sensed within the AV delay timing period or within 300 milliseconds. The minimum AV delay, as illustrated in the AV delay display area  401  is 10 milliseconds. The minimum AV delay corresponds to the maximum tracking rate (MTR) or the maximum sensor rate (MSR), which is 120 pulses per minute or 500 milliseconds. The maximum AV delay corresponds to the lower rate limit (LRL)  60  pulses per minute Ppm or 1000 milliseconds. 
     The LV offset display area  410  includes an LV offset parameter slide controller  413  and an adjustment guide  417  which provides a visual display of the LV offset timing window. The LV offset parameter slide controller  413  may be moved horizontally forward and backward to increase or decrease the LV offset timing window. Upon movement of the LV offset parameter slide controller  413 , the LV offset rate adjusts as illustrated in the LV offset parameter slide controller rate window  415 . The Left Ventricular Pace (LVP) indicator  530  line is an indication of the level at which the pacing in the left chamber needs to be offset from the pacing in the right chamber. Parameter slide controller  413  may be adjusted to the left of the Right Ventricular Pulse (RVP) indicator line  520  or to the right of the Right Ventricular Pulse (RVP) indicator line  520 . Movement of slide controller  513  to the left of the Right Ventricular Pulse (RVP) indicator line  520  indicates that the LV offset may be set for example at negative timing window, for example negative 40 milliseconds, which is reflective of the concept that the left chamber needs to be paced 40 milliseconds before the right chamber. Accordingly, Parameter slide controller  413  can be adjusted to either side of Right Ventricular Pulse (RVP) indicator line  520 . However, timing shall be based off of the Right Ventricular Pace. 
     Left Ventricular Pulse (LVP) indicator line  530  is the second edge of the LV offset window, which begins at the Right Ventricular Pulse (RVP) indicator line  520  and ends at the Left Ventricular Pulse (LVP) indicator line  530 . The actual value of the LV offset in the embodiment illustrated in display  400  is 80 milliseconds. The LV offset value may be modified or adjusted by sliding parameter slide controller  413  from the edge of the Right Ventricular Pulse (RVP) indicator line  520  up to a timing rate allowable within the program rules. 
     PVARP display area  420  is a post-ventricular atrial refractory period. Refractory periods are defined to make sure that the medical device doesn&#39;t sense during inappropriate times. If a natural event occurs, for example, a P wave or an R wave, or the medical device paces, the event may have happened in another chamber. However, some of the event may be sensed in other chambers and the medical device may believe an event has occurred in chambers for which an event has not. When this happens, it is problematic if the medical device reacts to these events. The refractory period makes sure that the medical device is not over sensing and thereby prevents the sensing of events in chambers that the medical device should be ignoring. Even though the medical device may see an event from a first chamber in a second chamber as if it occurred in the second chamber, the medical device will ignore the first chambers event during the refractory period. The chemistry of the heart tissue requires that the tissue receive a time of rest (refractory period) after it squeezes before it can squeeze again. Generally, the heart does not respond during this period. If the heart is not responding because it physically cannot, the medical device should not be responding to sensed events. If the medical device does not ignore those sensed events as the heart does, premature pacing would occur. Refractory periods are periods where the medical device sensing is blinded and the medical device will not pace if it senses an event during the refractory period. 
     The PVARP refractory period represented by the period from the edge of the Right Ventricular Pulse (RVP) indicator line  520  to the edge of the parameter slide controller  523 , is not reflected in display  400  to scale. The actual minimum and maximum PVARP refractory periods are displayed in the parameter slide controller rate windows  424  and  425  of parameter slide controllers  422  and  423 . The period from the edge of the parameter slide controller  423  to the maximum tracking rate indicator  550  is the period during which sensing following the right ventricular pace can occur. The period during which sensing can occur is graphically illustrated by changing the background of a portion of adjustment guide  427  to an alternative color or texture, represented in display  400  as white background with diagonal blue lines drawn there through  429 . 
     The PVARP refractory period is the period that affects sensing in the atrium following a right ventricular pace. Any events that occur within the atrium immediately following the Right Ventricular Pulse (RVP) indicator line  520  all the way to the maximum PVARP will be ignored. Alternatively, if the minimum PVARP is used, anything that occurs immediately following the Right Ventricular Pulse (RVP) indicator line  520  to the minimum PVARP will be ignored. Whether the system user utilizes the minimum or maximum PVARP is dependent upon whether pacing is occurring at the lower rate limit (LRL)  560  or the maximum tracking rate (MTR)  550 . If pacing by the medical device is occurring at the lower rate limit (LRL)  560 , anything sensed in the atrium between 0 and 250 milliseconds will be ignored. If pacing is based off of the maximum tracking rate (MTR)  550 , anything sensed between 0 and 240 milliseconds will be ignored. 
     RVRP display area  430  is representative of the right ventricular refractory period. It is comprised of the time that the ventricular sensing on the right side is ignoring events following a right ventricular pace represented by Right Ventricular Pulse (RVP) indicator line  520 . The RVRP display area  430  includes a blanking period  438 , parameter slide controllers  432  and  435  and an adjustment guide  437 . The RVRP refractory period represented by the period from the edge of the Right Ventricular Pulse (RVP) indicator line  520  to the edge of the parameter slide controller  435 , is not reflected in display  400  to scale. The actual minimum and maximum RVRP refractory periods are displayed in the parameter slide controller rate windows  433  and  434  and may be adjusted by horizontal movement of parameter slide controllers  432  and  435 . The period from the edge of the parameter slide controller  435  to the Maximum Tracking Rate (MTR) indicator  550  is the period during which sensing following the right ventricular pace can occur. 
     The RVRP refractory period is the period that affects sensing in the right ventricle following a right ventricular pace. Any events that occur within the right ventricle immediately following the Right Ventricular Pulse (RVP) indicator line  520  all the way to the maximum RVRP (represented by the edge of the parameter slide controller  435 ) will be ignored. Alternatively, if the minimum RVRP (represented by the edge of the parameter slide controller  432 ) is used, anything that occurs immediately following the Right Ventricular Pulse (RVP) indicator line  520  to the edge of the parameter slide controller  432  will be ignored. Whether the system user utilizes the minimum or maximum RVRP is dependent upon whether pacing is occurring at the lower rate limit (LRL)  560  or the maximum tracking rate (MTR)  550 . If pacing by the medical device is occurring at the lower rate limit (LRL)  560 , anything sensed in the atrium between 0 and 250 milliseconds will be ignored. If pacing is based off of the maximum tracking rate (MTR)  550 , anything sensed between 0 and 240 milliseconds will be ignored. 
     The left ventricular refractory period (LVRP) display  440  illustrates the timing that the ventricular sensing in the left ventricle is ignoring events following a left ventricular pace represented by Left Ventricle Pulse (LVP) indicator line  530 . The LVRP display area  430  includes a parameter slide controllers  443  and an adjustment guide  447 . The LVRP refractory period represented by the period from the edge of the Left Ventricular Pulse (LVP) indicator line  530  to the edge of the parameter slide controller  443 , is not reflected in display  400  to scale. The actual LVRP refractory period is displayed in the parameter slide controller rate windows  445  and may be adjusted by horizontal movement of parameter slide controllers  443 . 
     The left ventricular refractory period, which follows a left ventricular pulse  530 , is 250 milliseconds. It begins at the left ventricular pulse  530  and ends at the edge of parameter slide controller  443 . The actual refractory period timing parameter is illustrated in the parameter slide controller rate window  445 . The left ventricular refractory period may be increased or decreased by sliding parameter slide controller  443  horizontally from 0 milliseconds beginning at the left ventricular pace  530  out to the maximum tracking rate (MTR)  550 . 
     Display  400  also includes a diagram of a heart  500  that reflects the atrium  502 , the right ventricle  504  and the left ventricle  506 . The atrium  502 , the right ventricle  504  and the left ventricle  506  are all shaded different colors. In the present embodiment the colors are blue for the atrium  502 , magenta for the right ventricle  504  and orange for the left ventricle  506 . It is to be understood that the colors reflected in the atrium  502 , the right ventricle  504  and the left ventricle  506  may be any color so long as the colors are sufficient to identify a distinction between these chambers of the heart. The colored areas of the atrium  502 , the right ventricle  504  and the left ventricle  506  correspond to the adjustment guides  407 ,  417 ,  427 ,  437 , and  447  to reflect that for example in the AV delay, the adjustment guide  407  relates to delay in the atrium  502 . The LV offset adjustment guide  417  relates to offset within the right ventricle  504 . The refractory period adjustment guide  427  relates to the refractory period for the PVARP, which is associated with the atrium  502 . The refractory period adjustment guide  437  relates to the refractory period for the RVRP, which is associated with the right ventricle  504 , and the refractory period adjustment guide  447  relates to the refractory period for the LVRP, which is associated with the left ventricle  506 . 
     Display  400  also includes a static ECG trace  501  illustrating how the respective components of an ECG trace, including P-wave  512  and the QRS of a R-wave  514 . The atrial and ventricular waveforms P-wave  512  and the QRS of a R-wave  514  are adjusted based on timing parameters. For example, if the slide controller  403  is adjusted to decrease the maximum AV delay from 300 milliseconds to 250 milliseconds, the distance on the ECG trace from the atrial P-wave  512  to the ventricle R-wave  514  would also be decreased. The ECG trace also includes sensing window timing indicators  466  and  468  that illustrate sensing windows for the atrium  466  and sensing windows for the ventricle  468 . Sensing windows  466  and  468  illustrate the beginning and ending of the atrial and ventricular sensing windows in relation to an ECG. Sensing windows  466  and  468  are also color coded to graphically indicate to the user via display  400  that the sensing window  466  relates to the atrium  502  and that the sensing window  468  relates to the right ventricle  504 . In the embodiment illustrated in display  400  in  FIGS. 5 and 6 , sensing window  466  has is blue and sensing window  468  is magenta. It is to be understood that it is contemplated that the ECG trace  501  may not be static and may be an actual ECG trace of a patient illustrated dynamically in display  400 . 
     Display  400  also utilizes the automatic responsive adjustment function that automatically illustrates to the user when there are conflicts within the timing cycle parameters. As illustrated in  FIG. 6  of display  400 , there are conflicts within timing cycle parameters for the AV delay minimum and the PVARP refractory period minimum, as illustrated in parameter slide controller rate windows  404  and  424 . Within the AV delay display area  401 , the adjustment guide  407   a  turns red and has crosshatches for the portion of the AV delay timing cycle that creates a parameter conflict, if the AV delay minimum parameters are within that range. In display  400 , if the AV delay minimum, which is 80 milliseconds, is reduced to 50 milliseconds, the automatic response adjustment function would automatically remove the red crosshatches illustrated in  407   a  and  429   a , thereby informing the system user automatically that the parameters selected are no longer in conflict. 
     In addition, the background of the timing parameters illustrated in parameter slide controller rate windows  404  and  424  have a red background to further indicate to the user which particular timing cycle parameters are in conflict. The system includes a myriad of rules that define circumstances during which modification or adjustments of timing cycle parameters may create conflict between parameters. Upon the adjustment of timing cycle parameters causing parameter conflicts, the red cross hatches would be illustrated on the adjustment guide of the appropriate timing cycle and the background of the parameter slide controller rate window would become red to illustrate that these particular parameters need to be adjusted. Upon adjustment of these values the red background within the parameter slide controller rate window would be changed back to green if it is a non-programmed value and to white if it the current value that is programmed within the medical device. As illustrated in  FIG. 6 , the display  400  includes a help button  492 , which allows the system user to receive additional detail concerning the parameter conflicts created by the parameter adjustments made by the user. 
     It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments may be used in combination with each other. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the invention should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. In the appended claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.”