Abstract:
The present disclosure may provide a system and method for analyzing data acquired using a physiological monitor. In one embodiment, the analysis is performed on the physiological monitor and results in the analysis of data collected by the physiological monitor over an interval of time. The analysis may include comparing the data to sample data representative of known disease states and/or may include performing statistical analyses or recalculations of the data based on adjusted monitor settings. In one embodiment, the settings of the physiological monitor may be adjusted based on the results of the analyses.

Description:
BACKGROUND 
       [0001]    The present disclosure relates generally to medical devices, and, more particularly, to a physiological monitor having research capabilities. 
         [0002]    This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present disclosure, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. 
         [0003]    In the field of healthcare, caregivers (e.g., doctors and other healthcare professionals) often desire to monitor certain physiological characteristics of their patients. Accordingly, a wide variety of monitoring devices have been developed for monitoring many such physiological characteristics. These monitoring devices often provide doctors and other healthcare personnel with information that facilitates provision of the best possible healthcare for their patients. As a result, such monitoring devices have become a perennial feature of modern medicine. 
         [0004]    One technique for monitoring physiological characteristics of a patient is commonly referred to as pulse oximetry, and the devices built based upon pulse oximetry techniques are commonly referred to as pulse oximeters. Pulse oximeters may be used to measure and monitor various blood flow characteristics of a patient. For example, a pulse oximeter may be utilized to monitor the blood oxygen saturation of hemoglobin in arterial blood, the volume of individual blood pulsations supplying the tissue, and/or the rate of blood pulsations corresponding to each heartbeat of a patient. 
         [0005]    In practice, a pulse oximeter may be employed to provide a running assessment of a patient&#39;s physiological signs, such as pulse rate and blood oxygen saturation, and to indicate when one ort more of the monitored characteristics crosses an alarm or threshold value. However, in addition to this monitoring function, a pulse oximeter may also store the measured physiological data as it is collected over time. A pulse oximeter may allow some limited functionality in reviewing the measured data, such as displaying a historical trendline or waveform representing a measured physiological characteristic, but such review capabilities typically do not provide for meaningful analysis of the collected data. Instead, to the extent the collected physiological data is to be analyzed, the data may be exported to an external device, such as a computer or workstation, for analysis. The process of exporting data, however, may be complicated and/or time consuming and may remove the pulse oximeter from its principal monitoring duties. Further, the analysis of the collected data may utilize equipment and/or tools that are costly and/or not readily available. 
       SUMMARY 
       [0006]    Certain aspects commensurate in scope with the original claims are set forth below. It should be understood that these aspects are presented merely to provide the reader with a brief summary of certain embodiments and that these aspects are not intended to limit the scope of the claims. Indeed, the claims and disclosure may encompass a variety of aspects that may not be set forth below. 
         [0007]    A method for analyzing data is provided in an embodiment. In accordance with this embodiment, data is collected over a time interval using a physiological monitor. The data is analyzed on the physiological monitor. 
         [0008]    In accordance with an embodiment, a method for analyzing data is provided. In accordance with this embodiment, a research mode on a physiological monitor is entered in response to a user input. A set of data acquired by the physiological monitor over a time interval is accessed and one or more analyses are executed to analyze the set of data. The results of the one or more analysis routines are displayed. 
         [0009]    In accordance with an embodiment, a physiological monitor is provided. The physiological monitor includes a port capable of receiving sensor data and one or more memory or storage devices capable of at least storing the sensor data, one or more derived physiological characteristics, and/or one or more analysis routines. The physiological monitor also includes one or more processors capable of processing the sensor data to derive the one or more physiological characteristics and of executing the one or more analysis routines to analyze at least the sensor data or the physiological characteristics. 
         [0010]    In an embodiment, a system is provided. The system includes a physiological monitor capable of analyzing data when placed in a research mode. The system also includes one or more electronic devices in communication with the physiological monitor. The one or more electronic devices are capable of placing the physiological monitor in the research mode and/or of viewing the results of the research mode 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]    Advantages of the disclosure may become apparent upon reading the following detailed description and upon reference to the drawings in which: 
           [0012]      FIG. 1  is a perspective view of a pulse oximeter coupled to a multi-parameter patient monitor and a sensor in accordance with embodiments; 
           [0013]      FIG. 2  is a block diagram of the pulse oximeter and sensor coupled to a patient in accordance with embodiments; 
           [0014]      FIGS. 3-4  are exemplary graphical user interfaces of the pulse oximeter in accordance with embodiments; and 
           [0015]      FIG. 5  is a block diagram of a data analysis system in accordance with embodiments. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    One or more specific embodiments will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
         [0017]    Physiological monitors, such as pulse oximeters may be employed to provide running measurements of a patient&#39;s physiological characteristics and to alert caregivers when such measurements are abnormal. However, the physiological data collected over time by such devices may also provide useful information, such as diagnostic information, about a patient. For example, the analysis of hours or days worth of pulse oximetry data may provide useful information about a patient&#39;s susceptibility to apnea events or other respiratory or circulatory disorders. Further such analyses and/or diagnoses may suggest more appropriate monitoring parameters for the patient when using the physiological monitor, such as a pulse oximeter. However, it may be difficult or inconvenient to download the collected physiological data to an appropriate analysis platform, such as a computer. Accordingly, it may be desirable to provide analysis functionality on the monitor, such as on a pulse oximeter. 
         [0018]      FIG. 1  is a perspective view of such a pulse oximetry system  10  in accordance with an embodiment. The system  10  includes a sensor  12  and a pulse oximetry monitor  14 . The sensor  12  includes an emitter  16  for emitting light at certain wavelengths into a patient&#39;s tissue and a detector  18  for detecting the light after it is reflected and/or absorbed by the patient&#39;s tissue. The monitor  14  may be capable of calculating physiological characteristics received from the sensor  12  relating to light emission and detection. Further, the monitor  14  includes a display  20  capable of displaying the physiological characteristics, other information about the system, and/or alarm indications. The monitor  14  also includes a speaker  22  to provide an audible alarm in the event that the patient&#39;s physiological characteristics exceed a threshold. The sensor  12  may be communicatively coupled to the monitor  14  via a cable  24 . However, in other embodiments a wireless transmission device or the like may be utilized instead of or in addition to the cable  24 . 
         [0019]    In the illustrated embodiment, the pulse oximetry system  10  also includes a multi-parameter patient monitor  26 . In addition to the monitor  14 , or alternatively, the multi-parameter patient monitor  26  may be capable of calculating physiological characteristics and providing a central display  28  for information from the monitor  14  and from other medical monitoring devices or systems. For example, the multi-parameter patient monitor  26  may display a patient&#39;s SpO 2  and pulse rate information from the monitor  14  and blood pressure from a blood pressure monitor on the display  28 . Additionally, the multi-parameter patient monitor  26  may indicate an alarm condition via the display  28  and/or a speaker  30  if the patient&#39;s physiological characteristics are found to be outside of the normal range. The monitor  14  may be communicatively coupled to the multi-parameter patient monitor  26  via a cable  32  coupled to a sensor input port or a digital communications port. In addition, the monitor  14  and/or the multi-parameter patient monitor  26  may be connected to a network to enable the sharing of information with servers or other workstations. 
         [0020]      FIG. 2  is a block diagram of the exemplary pulse oximetry system  10  of  FIG. 1  coupled to a patient  40  in accordance with embodiments. Examples of pulse oximeters that may be used in the implementation of the present disclosure include pulse oximeters available from Nellcor Puritan Bennett LLC, but the following discussion may be applied to other pulse oximeters and medical devices. Specifically, certain components of the sensor  12  and the monitor  14  are illustrated in  FIG. 2 . The sensor  12  may include the emitter  16 , the detector  18 , and an encoder  42 . It should be noted that the emitter  16  may be capable of emitting at least two wavelengths of light e.g., RED and IR, into a patient&#39;s tissue  40 . Hence, the emitter  16  may include a RED LED  44  and an IR LED  46  for emitting light into the patient&#39;s tissue  40  at the wavelengths used to calculate the patient&#39;s physiological characteristics. In certain embodiments, the RED wavelength may be between about 600 nm and about 700 nm, and the IR wavelength may be between about 800 nm and about 1000 nm. Alternative light sources may be used in other embodiments. For example, a single wide-spectrum light source may be used, and the detector  18  may be capable of detecting certain wavelengths of light. In another example, the detector  18  may detect a wide spectrum of wavelengths of light, and the monitor  14  may process only those wavelengths which are of interest. It should be understood that, as used herein, the term “light” may refer to one or more of ultrasound, radio, microwave, millimeter wave, infrared, visible, ultraviolet, gamma ray or X-ray electromagnetic radiation, and may also include any wavelength within the radio, microwave, infrared, visible, ultraviolet, or X-ray spectra, and that any suitable wavelength of light may be appropriate for use with the present disclosure. 
         [0021]    In an embodiment, the detector  18  may be capable of detecting the intensity of light at the RED and IR wavelengths. In operation, light enters the detector  18  after passing through the patient&#39;s tissue  40 . The detector  18  may convert the intensity of the received light into an electrical signal. The light intensity may be directly related to the absorbance and/or reflectance of light in the tissue  40 . That is, when more light at a certain wavelength is absorbed or reflected, less light of that wavelength is typically received from the tissue by the detector  18 . After converting the received light to an electrical signal, the detector  18  may send the signal to the monitor  14 , where physiological characteristics may be calculated based at least in part oil the absorption of the RED and IR wavelengths in the patient&#39;s tissue  40 . 
         [0022]    The encoder  42  may contain information about the sensor  12 , such as what type of sensor it is (e.g., whether the sensor is intended for placement on a forehead or digit) and the wavelengths of light emitted by the emitter  16 . This information may allow the monitor  14  to select appropriate algorithms and/or calibration coefficients for calculating the patient&#39;s physiological characteristics. The encoder  42  may, for instance, be a coded resistor which stores values corresponding to the type of the sensor  12  and/or the wavelengths of light emitted by the emitter  16 . 
         [0023]    These coded values may be communicated to the monitor  14 , which determines how to calculate the patient&#39;s physiological characteristics. In another embodiment, the encoder  42  may be a memory on which one or more of the following information may be stored for communication to the monitor  14 : the type of the sensor  12 ; the wavelengths of light emitted by the emitter  16 ; and the proper calibration coefficients and/or algorithms to be used for calculating the patient&#39;s physiological characteristics. Pulse oximetry sensors capable of cooperating with pulse oximetry monitors include the OxiMax® sensors available from Nelicor Puritan Bennett LLC. 
         [0024]    In an embodiment, signals from the detector  18  and the encoder  42  may be transmitted to the monitor  14 . The monitor  14  generally may include processors  48  connected to an internal bus  50 . Also connected to the bus may be a read-only memory (ROM)  52 , a random access memory (RAM)  54 , user inputs  56 , one or more mass storage devices  58  (such as hard drives, disk drives, or other magnetic, optical, and/or solid state storage devices), the display  20 , or the speaker  22 . A time processing unit (TPU)  60  may provide timing control signals to a light drive circuitry  62  which controls when the emitter  16  is illuminated and the multiplexed timing for the RED LED  44  and the IR LED  46 . The TPU  60  control the gating-in of signals from detector  18  through an amplifier  64  and a switching circuit  66 . These signals may be sampled at the proper time, depending upon which light source is illuminated. 
         [0025]    The received signal from the detector  18  may be passed through an amplifier  68 , a low pass filter  70 , and an analog-to-digital converter  72 . The digital data may then be stored in a queued serial module (QSM)  74  for later downloading to the RAM  54  or mass storage  58  as the QSM  74  fills up. In one embodiment, there may be multiple separate parallel paths having the amplifier  68 , the filter  70 , and the JD converter  72  for multiple light wavelengths or spectra received. 
         [0026]    The processor(s)  48  may determine the patient&#39;s physiological characteristics, such as SpO 2  and pulse rate, using various algorithms and/or look-up tables based generally on the value of the received signals corresponding to the light received by the detector  18 . In certain embodiments, the processor(s)  48  may also analyze previously acquired physiological characteristics, such as the trend data, to provide diagnoses based upon the trend data and/or to recommend monitor settings for the patient based upon the trend data. For example, the processor(s)  48  may execute analysis routines stored in the ROM  52  and/or the mass storage  58  to analyze trend or other historical data stored in the RAM  54  or mass storage  58 . 
         [0027]    Signals corresponding to information about the sensor  12  may be transmitted from the encoder  42  to a decoder  74 . The decoder  74  may translate these signals to enable the microprocessor to determine the proper method for calculating the patient&#39;s physiological characteristics, for example, based generally on algorithms or look-up tables stored in the ROM  52  or mass storage  58 . In addition, or alternatively, the encoder  42  may contain the algorithms or look-up tables for calculating the patient&#39;s physiological characteristics. 
         [0028]    In an embodiment, the monitor  14  may also include one or more mechanisms to facilitate communication with other devices in a network environment. For example, the monitor  14  may include a network port  76  (such as an Ethernet port) and/or an antenna  78  by which signals may be exchanged between the monitor  14  and other devices on a network, such as servers, routers, workstations and so forth. In some embodiments, such network functionality may be facilitated by the inclusion of a networking chipset  80  within the monitor  14 , though in other embodiments the network functionality may instead be provided by the processor(s)  48 . 
         [0029]      FIGS. 3-4  illustrate an embodiment of a monitor  14  for use in the system  10  ( FIG. 1 ). The monitor  14  may generally include the display  20 , the speaker  22 , the user inputs  56 , and a communication port  80  for coupling the sensor  12  to the monitor  14 . In one embodiment, the display  20  may be a standard LCD or CRT type display (such as a VGA or SVGA screen) and the user inputs  56  may be mechanical or electrical buttons, dials, keys, switches and so forth. In other embodiments, the display  20  may be a touchscreen (such as a color or gray-scale screen) and some or all of the user inputs  56  may be locations on the touchscreen corresponding to the desired command or action. 
         [0030]    The user inputs  56  may enable the caregiver to control the monitor  14  and change settings. For example, an alarm silence button  82  may enable the caregiver to silence an audible alarm (e.g., when the patient is being cared for), and volume buttons  84  may enable the caregiver to adjust the volume of the alarm and/or any other indicators emitted from the speaker  22 . In addition, soft keys  86  may correspond to variable functions, as displayed on the display  22 . The soft keys  86  may provide access to further data and/or setting displays. Soft keys  86  provided on the display  20  may enable the caregiver to see and/or change alarm thresholds, view different trend data, change characteristics of the display  20 , turn a backlight on or off, or perform other functions. 
         [0031]    The monitor  14  may display physiological characteristics, such as, for example, an SpO 2  value  90  (i.e., percentage), a pulse rate  92  (i.e., beats per minute), and/or a plethysmographic waveform (i.e., a plot  94 ) when used to monitor a patient. In the course of such a monitoring operation, the monitor  14  may store the measured physiological data. For example, hours, days, or weeks worth of measured data may be stored on the monitor  14 . 
         [0032]    In an embodiment, the monitor  14  may include an option to enter a research mode, such as by activating a programmable soft key  86 . Such a research mode may allow analysis of some or all of the stored physiological data. For example, selecting the soft key  86  labeled “Research” in  FIG. 3  may cause the display of a research mode screen that provides selectable analysis options and/or displays the results ( FIG. 4 ) of such an analysis. 
         [0033]    In an embodiment, the monitor  14  may indicate, such as by vistal or audible signals, when the monitor  14  is in research mode as opposed to monitoring mode. For example, as depicted in  FIG. 4 , the monitor  14  may display a banner or caption (such as “DATA ANALYIS” or “RESEARCH MODE”) on the display  20  to indicate when the monitor  14  is in research mode. In this way, a user can be visually and/or audibly alerted that the monitor  14  is displaying data analysis options or results and not the patient&#39;s current physiological characteristics. In one embodiment, though the monitor  14  may be in research mode and may not be displaying current measured physiological characteristics, the monitor  14  may still be actively monitoring the patient. Similarly, in some embodiments, the monitor  14  may still display some current measured physiological characteristics even when in research mode, such as in a side bar or along the top or bottom edge of the display  20 . 
         [0034]    The research mode may allow a user to implement a variety of post-processing analyses of the acquired data over some preceding time frame or may automatically implement one or more of such analyses. For example, in one embodiment, the research mode may automatically or upon user instruction analyze 1, 2, 4, 6, 8, 10, 12, 24, 36, and/or 48 hours of acquired physiological data for a patient (or, indeed, any duration of acquired physiological data sufficient to perform the selected analysis). The analyzed data may or may not be the most recent acquired data. For example, in one embodiment, the analyzed data may not be the most recent data but may instead correspond to a certain period of prior patient activity (such as a sleep cycle or period of exercise). In this manner, irregularities in the physiological characteristic(s) being analyzed may be determined during periods of interest, such as when the patient sleeps or is under physical stress. 
         [0035]    In an embodiment, the analyses may take a variety of forms and may include statistical analyses, filtering operations, neural networks, and/or pattern recognition operations. In such an embodiment, the analyses may be performed on the derived physiological characteristics, such as SpO 2  and pulse rate, or on the underlying sensed data, i.e., the measurements of light reflectance or transmission at different wavelengths and/or times. 
         [0036]    In an embodiment, a monitor  14  may be a pulse oximeter utilized in a sleep lab to evaluate a patient for apnea events or other respiratory irregularities during a sleep cycle. In such an embodiment, after a sleep session the monitor  14  may be placed in research mode, such as by activating the appropriate soft key  86  or location on a touchscreen. In research mode, the physiological data corresponding to the sleep cycle, such as an 8 hour set of SpO 2  and/or pulse measurements acquired while the patient slept, may be statistically analyzed to identify patterns in the trend data corresponding to apnea events, to count the number of apnea events, to determine average and/or median SpO 2  and/or pulse rate, and/or to calculate an index value (such as a saturation pattern detection (SPD) index value) categorizing or diagnosing the patient based on the observed data. Such analyses may be specified and/or initiated by a user or may be performed automatically upon entering research mode. 
         [0037]    For example,  FIG. 4  depicts an embodiment in which a monitor  14  in a data analysis or research mode displays various results of statistical analyses performed on physiological trend data acquired over time. Such results may include an SPD and/or pattern index, average and median SpO 2  values, and/or a count of apnea events, as depicted. In addition, as depicted in  FIG. 4 , a soft key  86  may be programmed and appropriately labeled to return the monitor  14  to a monitor mode. In certain embodiments a time out feature may also be provided so that an interval of time, such as five minutes, with no activity automatically returns the monitor  14  to monitor mode from research mode. In other embodiments, security mechanisms such as a password, barcode, and/or RFID tag may be used to enable research mode. 
         [0038]    In an embodiment, the analyses available in the research mode may include manipulating how physiological characteristics were derived and/or sensed data measured over a preceding time interval. For example, for a previously acquired set of measurements, one or more different calibration coefficients may be applied and/or one or more different algorithms for deriving SpO 2  or some other characteristic may be applied to the sensed data. In this way, a previous set of measured physiological characteristics or the trend derived from such characteristics may be recalculated based upon different calibration, equations, and/or other parameters. The recalculated characteristics and/or trend line may be subjected to additional analyses by the monitor  14  in research mode and/or may be visually reviewed by a caregiver. 
         [0039]    In an embodiment, the operation of the monitor  14  and/or the performance of the staff at the facility over a time interval may be analyzed when in the research mode. For example, in such an embodiment, the number of alarms and/or the length of time alarms sound before being silenced may be analyzed in the research mode of the monitor  14 . Such response time measurements may be used to evaluate staff performance and/or to evaluate whether the alarm limits for a particular patient are appropriate. 
         [0040]    With the foregoing discussion in mind, one or more system settings or parameters of the monitor  14  may be evaluated based on the results of the analyses and recommendations made with regard to these setting or parameter values. For example, the monitor  14  may have various alarm limits set for a measured physiological characteristic and/or may apply certain calibration coefficients or algorithms in deriving such physiological characteristics. These parameters may initially be set to a default value) such as to a default value based on the patient&#39;s age, sex, physical condition, and so forth. After collection of physiological or monitor data over an interval of time and analysis of this collected data on the monitor in the research mode, suggested parameters (such as alarm limits, calibration coefficients, and/or algorithms) may be generated or selected based on the results of the statistical analyses (such as based on the number of apnea events, a calculated SPD index value, a recalculation of the SpO 2  values or trend line, and/or an analysis of the number of alarms and/or staff response time). 
         [0041]    In an embodiment, the suggested parameters may be automatically implemented on the monitor  14 . In another embodiment, the suggested parameters may be implemented on the monitor  14  when a user accepts the new parameters. For example, referring to  FIG. 4 , a message such as “Reconfigure Parameters” may be displayed on the display  20  along with respective yes/no soft key options such that a user can indicate whether or not the settings of the monitor  14  are to be reconfigured based on the analyses. In some embodiments the suggested settings may be displayed for review by the user, though in other embodiments the suggested settings are not displayed. After implementation of the new parameters, the monitor  14  may be returned to monitor mode, such as by selection of a suitably configured soft key  86 , to continue monitoring the patient. 
         [0042]    In some embodiments the monitor  14  may communicate with other devices to facilitate or share the analyses performed using the implemented research mode. For example, referring to  FIG. 5 , the monitor  14  may be connected by wired or wireless techniques to a variety of systems such as one or more workstations  100  used in a clinical environment and/or to handheld devices  102  such as may be carried by doctors or other caregivers. As depicted, the workstations  100  and/or handheld device  102  may communicate with the monitor  14  by a variety of topologies. For example, a workstation  100  or handheld device  102  may communicate directly with the monitor  14  or may be connected via a router or switch  104  and/or server  106  provided as part of a network on which the monitor  14  resides. In such a networked embodiment, the monitor  14  may communicate with devices on a local network, such as within a department or hospital, or on attached or external networks. 
         [0043]    In view of the various communication configurations in which the monitor  14  can participate, in certain embodiments, the research mode of the monitor  14  may also leverage these communication connections. For example, in one embodiment the monitor  14  may communicate in networked relationship (such as a peer-to-peer relationship) with a workstation or other processor-based system, such as a hand held device. In such an embodiment, the research mode application may be a networked application, taking advantage of computing and/or storage resources shared between the monitor  14  and the other peer-to-peer or networked devices. Thus, the research mode application may act as if it were implemented or running on a single platform even though aspects of the application may be stored and/or executed on the combination of networked devices. Further, in one such embodiment, resources such as input devices, i.e., keyboards, mice, and so forth, and display devices may be shared. In such an embodiment, an analysis may be configured or initiated at the monitor  14 , workstation  100 , and/or handheld device  102  using each devices respective input interface. Likewise, the results from the research mode analyses may be displayed on the connected device(s), such as at the workstation  100  or handheld device  102 , as well as at the monitor  14 . Thus, a caregiver may be located in their office or otherwise away from the monitor  14  and still perform data analyses on the monitor  14  using other available processor-based systems. 
         [0044]    Similarly, in an embodiment the monitor  14  may host a web page that may be accessible by connected devices. The web page interface hosted on the monitor  14  in such an embodiment may allow a remote user to initiate, manipulate, and/or view results of a research mode analysis performed at the monitor  14 . In such an embodiment, the research mode and corresponding analyses may be performed on the monitor  14 , but the interface for controlling the analyses and viewing the results may reside on a device in communication with the monitor  14  which may be capable of interacting with the hosted web page. For example, a computer, personal digital assistant (PDA), or cell phone capable of displaying and interacting with a web page may be used to control and view the research mode processes executing on the monitor  14 . In such an embodiment the device in communication with the monitor  14  may be equipped with a web browser to interact with the web page hosted on the monitor  14  but does not need any application specific software or hardware to implement the research mode analyses. 
         [0045]    In addition, in some embodiments the research mode of the monitor  14  may function as a training or demonstration device. In such an embodiment, exemplary SpO 2  trend data for various disease states may be stored on the monitor  14  and displayed separately or in conjunction with acquired patient trend data. A user in the research mode might, therefore, be able to flip between an example of what a SpO 2  trend line looks like for one or more particular disease states and the SpO 2  trend line for a patient monitored by the monitor  14 . Further, the user may be allowed to manipulate the configuration of the monitor  14  to see the effect of such manipulations of the displayed disease state trend data. In this manner; a user may familiarize himself or herself with how a disease state might be presented on the monitor  14  or how thresholds for caregiver alerts can be manipulated to trigger at the optimal time. This feature may be used in conjunction with a web page hosted on the monitor  14  to allow viewers at another location, such as a classroom, to compare the exemplary disease state trend lines with a tend line associated with a patient. 
         [0046]    While only certain features have been illustrated and described herein, many modifications and changes will occur to those skilled in the all. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within their true spirit.