bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cardiac catheterization in infants through a venous cutdown sheath
Authors: Henry G. William , Harned Herbert S. 
Published: March 2007

AbstractWhen percutaneous vascular access for cardiac catheterization of small infants fails, necessitating a cutdown approach, we cannulate the isolated vein (usually the great saphenous vein) with a guidewire, dilator, and sheath with subsequent introduction of the catheter through the indwelling sheath. We have used this technique in sixty‐one infants without complications and recommend this modified sheath approach because of the following advantages: ease of introduction of the introducer set and catheter, the ability to change catheters quickly, elimination of distal vascular spasm, reduction of vascular trauma induced by catheter manipulation, prevention of backflow bleeding at the catheter entry site, and possible reduction of catheterization time.
Two‐dimensional echocardiographic assessment of left ventricular stroke volume: Experimental correlation with thermodilution and cineangiography in normal and ischemic states
Authors: Gueret Pascal , Meerbaum Samuel , Zwehl Werner , Wyatt H. L. , Davidson Robert M. , Uchiyama Takahisa , Corday Eliot 
Published: March 2007

AbstractLeft ventricular stroke volumes derived by two‐dimensional echocardfography (20 echo) were compared with thermodilution and Cineangiography measurements in closed‐chest dogs before and one hour after proximal LAD occlusion. Stroke volume was calculated from end‐dlastolic and end‐systolic volumes reconstructed by two models: (1) Simpson's rule employing left ventricular length and five short‐axis cross‐sectional areas; (2) a simplified volume formula (V = 5/6 area · length), utilizing a single short‐axis area at either the mitral valve or midpapillary muscle level. The comprehensive Simpson reconstruction yielded a good correlation of 2D echo stroke volume against thermodilution (r = 0.89) over a range of normal (N = 14) and ischemic (N = 8) states. The simplified formula provided a satisfactory correlation (r = .90, N = 22) when using the midpapillary cross‐section, which encompassed the Induced ischemic dys‐synergy. In contrast, when using the mitral valve level cross‐section above the site of ventricular asymmetry, there was no significant statistical correlation. Comparison of Cineangiography with 2D echo volume reconstruction based on the simplified formula with the midpapillary muscle level section yielded good correlations for stroke volume (r = 0.87) and ejection fraction (r = 0.97). Intraobserver and interobserver variability of duplicate echo stroke volume measurements was 8% and 10%, respectively. We conclude that 2D echocardlography In dogs permits quantitatlon of left ventricular stroke volume in normal and ischemic states.
Can the human right ventricle create a negative diastolic pressure suggestive of suction?
Authors: Sabbah Hani N. , Anbe Daniel T. , Stein Paul D. 
Published: March 2007

AbstractPressure in the right ventricle (RV) as well as the right atrium (RA) and pulmonary artery (PA) were measured in 80 patients with catheter‐tip mlcromanometere and evaluated to determine If the pressures are compatible with the concept of RV diastollc suction. In 40 patients with normal PA pressure, minimal RV diastollc pressure that occurred during early filling, was negative (−2 ± 0.3 mm Hg) (mean ± SEM). In 29 patients with PA hypertension, minimal RV dlastolic pressure during expiration also was negative (−2 ± 0.7 mm Hg). In 11 patients with right ventricular failure, however, minimal RV diastolic pressure was positive (9 ± 2 mm Hg). These results indicate that the human right ventricle, in the absence of failure, has a negative early diastollc pressure, which may reflect RV diastollc suction.
Subvalvular left ventricular pseudoaneurysm: A rare complication of mitral valve replacement
Authors: Bassan Roberto , Jasbik Waldir , Souza Maria Angelica De , Nogueira Alvaro Alves , Luz Fabio S. Oliveira , Baldwin Brian J. 
Published: March 2007

AbstractA patient who developed a subvalvular left ventricular paeudoaneurysm following mitral valve replacement is presented, the fourth such case in the literature. The etiology of this uncommon complication is felt to be caused by excessive surgical resection of the diseased nitral valve, which may weaken or cause rupture of the heart at the mitral annulus. The diagnosis can only be made by left ventriculography. Surgical treatment is indicated, because rupture of the pseudoaneurysm can occur.
Coronary artery dissection secondary to coronary arteriography: Presentation of three cases and review of the literature
Authors: Morise Anthony P. , Hardin Nicholas J. , Bovill Edwin G. , Gundel Walter D. 
Published: March 2007

AbstractThree cases of coronary artery dissection secondary to coronary arteriography are presented. Two of these include autopsy material demonstrating medial degeneration in the coronary arteries, which may have predisposed these arteries to dissect The literature on catheter‐induced coronary artery dissection is reviewed and an analysis is presented.
Nonsurgical untangling of a multiple‐coiled flow‐directed catheter
Authors: Handler Bruce , Lam Wilfred 
Published: March 2007

AbstractA multiple‐coiled, flow‐directed balloon‐tipped catheter was successfully untangled by hooking it with a tip‐deflector guidewlre. This nonsurgical technique was an effective means of untangling the catheter when previously reported techniques were not feasible.
A time‐saving technique in angiography of aortocoronary bypass patients
Authors: Arani Djavad T. 
Published: March 2007

AbstractWe have used the sidewinder catheter for selective cattwterization and anglography of aortocoronary bypass grafts and have been Impressed by the usefulness of this catheter. Selective anglography of vein grafts can be done easily and quickly wtth this catheter, with a very high success rate.
An accurate method for the continuous measurement of oxygen consumption in infants during cardiac catheterization
Authors: Ahrend Jacob , Damjanovic Dragana , Kerr Lorraine , Kappagoda C. Tissa 
Published: March 2007

AbstractThis paper describes the assessment of a method for measuring the oxygen consumption of infants and young children that is suitable for use in the cardiac Catheterization laboratory. It is based upon the open‐circuit technique and permits the continuous display of the oxygen consumption during the investigative procedures. The accuracy of the apparatus was assessed over the range 40‐200 ml/min, both in vitro and in vivo. It was found that the apparatus was free from systematic error and that it had a random error of approximately 2% of the measured value.
New family of preformed left atrial‐coronary catheters for retrograde left atrial catheterization and coronary and/or aortocoronary bypass angiography via brachial artery cutdown
Authors: Freeman D. Joe 
Published: March 2007

AbstractA previously described preformed No. 7 Oucor catheter for retrograde left atrlal catheterizatlon was modified for coronary anglography and used In 358 consecutive patients, 22 of whom had 26 of 51 previous aortocoronary bypass grafts still patent in 42 patients these catheters were also employed for retrograde left atrial catheterlzation. Sixty percent of right coronary, 96% of left coronary, and 96% of aortocoronary bypass anglography attempts were successful. Complete left heart study and anglography were accomplished with one catheter in ten patients (2.8%), with two catheters in 200 patients (55.9%), with three catheters in 132 patients (36.9%), and with more than three catheters In 16 patients (4.5%). Except in 4 of 12 patients with aortic valve deformities, left atrial catheterlzation was achieved whenever attempted. The complication rate was within acceptable limits. Average left heart and angiography procedure and fluoros‐copy times were respectively 29.4 and 6.5 minutes. In addition to reconfirming usefulness for retrograde left atrial catheterlzation, these data demonstrate this family of catheters is useful for coronary–particularly left–and aortocoronary bypass angiography.
Improvement in the design of preshaped coronary catheters
Authors: Farrehi Cyrus 
Published: March 2007

AbstractBecause of the slanted relationship between the origins of coronary arteries and the adjacent sinus, a nonplanar angle of 45 degrees is proposed to be incorporated In the distal part of the preshaped coronary catheters that need the aortic valve for direction toward the coronary ostla. This angulation will Improve the catheter function and reduce the risk of coronary angiography.
A new lack of twist for the judkins left coronary catheter
Authors: Hirshfeld John W. , Untereker William J. , Goldberg Sheldon , Dlenel Nicholas H. , Drew Thomas , Lozner Eugene 
Published: March 2007

AbstractWe have developed a modified Judkins left coronary arteriography catheter. The catheter is fabricated from 7 French thin‐walled tubing made of extruded polyethylene. This tubing has a larger lumen diameter than either the 7 French or 8 French torque‐control tubings used for standard Judkins coronary arteriography catheters. The large lumen substantially improves the pressure‐flow characteristics of the catheter. Accordingly, it is considerably easier to inject contrast medium through this tubing. Although this tubing has no torslonal rigidity, the lack of torque‐control has proved to be an advantage rather than a detriment in the use of the catheter. Based on an experience of over 2,000 studies with this catheter, we feel that it is superior to standard torque‐control catheters for left coronary anglograms.
Radiographic anatomy of the internal mammary arteries
Authors: Singh Ram N. 
Published: March 2007

AbstractThe radiographic anatomy of the IMAs is described based on bilateral selective arteriography in 100 patients with coronary artery disease. The right and left IMAs were identical in caliber in their mid portions in 94% of cases. Fifteen percent of the IMAs measured less than 2 mm in luminal diameter at the level of the fourth costal cartilage. The side branches showed a great deal of variability and asymmetry in their origin and distribution. The understanding of the radiographic anatomy of the IMA and its branches is helpful in preoperative appraisal and is crucial for postoperative evaluation of the IMA grafts.
The role of intra‐aortic balloon pump in the management of patients with main left coronary artery disease
Authors: Vijayanagar R. , Bognolo Diego A. , Eckstein Paul F. , Toole John C. , Natarajan P. , Mukherjee D. 
Published: March 2007

AbstractSeventy‐five patients with ≥70% stenosis of the left main coronary artery (LMCA) were treated surgically between January 1974 and February 1980. The group consisted of 57 men and 18 women with a mean age of 62.8 years. All patients were symptomatic with angina pectoris, and 64 (85%) had unstable angina. Twenty‐nine patients (38.6%) had electrocardiographic evidence (ECG) of old myocardial infarction (MI) and only six (8%) had a normal resting ECG. Preoperative exercise testing was done in 22 of the 75 patients. The stress test was positive in all patients, 17 (77%) of whom had > 2 mm ST depression; 90.6% (68/75) had significant right coronary artery disease. The intra‐aortic balloon pump (IABP) was inserted preoperatively in only four patients (5%) and was required in two additional patients postoperatively. The IABP was inserted preoperatively in four patients because of medically refractory angina and not on the basis of coronary anatomy alone. An average of three grafts per patient were inserted. There were three (4%) postoperative myocardial infarctions and two (2.6%) deaths. During the follow‐up period, which comprised 105 patient‐years, there was one myocardial infarction and one death. These data indicate that successful surgical treatment of left main coronary artery disease can be achieved with low mortality and that routine preoperative insertion of IABP is unnecessary.
Tricuspid stenosis masquerading as right ventricular failure in a patient with a prosthetic mitral valve
Authors: Borow Kenneth M. , Henschke Claudia , Sloss Laurence J. , Wynne Joshua 
Published: March 2007

AbstractEchocardiographic, phonocardiographic, and pulse tracing recordings demonstrated clinically unsuspected tricuspid stenosis in a 53‐year‐old man with a prosthetic mitral valve and signs of right heart failure. Physiologic correlates of the patient's heart sounds and diastolic murmur were studied by simultaneous M‐mode echocar‐diograms and phonocardiograms. Cardiac catheterization and subsequent valve surgery confirmed the presence of tricuspid stenosis. It is important to consider the diagnosis of tricuspid stenosis in all patients with a history of rheumatic mitral valve disease who develop findings suggestive of right ventricular failure.
A safe, rapid method of transfemoral retrograde left ventricular catheterization in valvular aortic stenosis
Authors: Little William C. , Arciniegas Joaquin G. , Mantle John A. 
Published: March 2007

AbstractWe report our experience with the use of a standard left Amplatz coronary catheter and a guidewire to cross the aortic valve in 34 patients being evaluated for valvular aortic stenosis. A number 2 Amplatz left coronary catheter inserted via the femoral artery was positioned above the noncoronary aortic valve cusp with the tip aligned toward the aortic valve. This catheter allowed a soft‐tipped, Teflon‐coated guidewire to be guided through the aortic valve orifice. The catheter was then advanced over the guidewire into the left ventricle. This technique was successful within six minutes in 32 of 34 patients (94%). The stenotic aortic valve was crossed in less than two minutes in 15 patients (42%) and in less than four minutes in 31 (91%). The aortic valve was not crossed in two patients. Twenty‐one patients (62%) had an aortic valve area area of less than 0.75 cm2. There were no complications. We conclude that this technique provides a method for safe, rapid transaortic left ventricular catheterization in patients with aortic stenosis of all degrees of severity.
Percutaneous left ventricular angiography
Authors: Wong C. M. , Wong P. H. C. , Miller G. A. H. 
Published: March 2007

AbstractRecurrence of persistence of heart failure in patients after mitral and aortic valve replacement is a difficult diagnostic problem. Clinical evaluation and noninvasive tests cannot always distinguish poor left ventricular function from paraprosthetic leak or persistent pulmonary vascular disease. Full evaluation by cardiac catheterisation may then be necessary but is difficult because of the inaccessibility of the left ventricle. Under these circumstances, left ventriculography by direct transapical puncture is an alternative to crossing the prosthesis by a catheter and may be the only way of obtaining diagnostic information. We describe our experience of left ventriculog‐raphy by percutaneous transapical passage of a flexible angiographic catheter (as distinct from a rigid angiographic needle) in 15 such patients (on 16 occasions). Non‐fatal complications occurred in three patients. The information thus obtained allowed a clinical decision to be made and distinguished the inoperable from the operable group. Surgery was subsequently performed in seven patients with beneficial results.
Percutaneous intraaortic balloon insertion in patients with aortoiliac disease
Authors: Nichols Allen B. , Weiss Melvin B. , Casarella William J. , Bregman David 
Published: March 2007

AbstractA new technique for percutaneous insertion of intraaortic balloon catheters in patients with tortuous or narrowed external iliac arteries is described. This method uses a long (45 cm) 12F sheath, which extends up to the descending aorta and protects the iliac artery and aorta from injury during insertion of the balloon catheter. Insertion of intraaortic balloon catheters was not possible by conventional percutaneous technique in six patients with severe acute myocardial ischemia. Use of the long sheath approach permitted rapid and successful institution of circulatory support in these patients.
A coronary pressure‐recording and contrast‐delivery system for percutaneous transluminal coronary angioplasty
Authors: Dorros Gerald , Spring Donald A. 
Published: March 2007

AbstractA simple, double‐transducer, coronary pressure recording and contrast‐delivery system is described for use in percutaneous transluminal coronary angioplasty with either the Sones or the Judkins technique. The materials are all readily available in most cardiac catheterization laboratories.
Analysis of the complications of cardiac catheterization over nine years
Authors: Gwost Jim , Stoebe Tom , Chesler Elliot , Weir E. Kenneth 
Published: March 2007

AbstractThe mortality and morbidity associated with cardiac catheterization at the Minneapolls VA Modical Center has been analysed over a period of nine years (1971–1979) In order to identity correctable problems, obtain accurate data for patient information, and allow comparison with other institutions. In common with reports from other cather laboratories, the mortality has fallen from 0.74% (952 patients) between 1971 and 1975 to 0.24% (819) patients between 176 and 1979. There has been a similar deciline in the combined incidence of myocardial infarction and carebral embolism from 1.05% to 0.24% over the same period. Our patients with ischemic heart disease included many at high risk of complications in that three vessel disease was present in 53% and the ejection fraction was loss than 50% in 24% of cases. In order to ensure that the best standards of cardiac catheterization are maintained, we agree with a recent auggestion that there should be a national survelliance program monitoring fatality and complication rates in catheterization laboratoris.
Left main stem coronary artery dissection during coronary angiography
Authors: Kruyswijk H. H. , Müller E. J. 
Published: March 2007

AbstractThis paper describes a case of dissection of the main stem of the left coronary artery during coronary angiography with an uneventful clinical course. As far as we know, only one comparable case has been reported before. A brief survey of the pertinent literature is presented. Some possible pathogenetic factors are considered. No specific preventive or therapeutic measurement can be recommended.
The relationship between left ventricular functional response to isometric exercise and asynergic contraction and diastolic stiffness
Authors: Ludbrook Philip A. , Gowda Siddhesh , Tiefenbrunn Alan J. , Reed Frank R. 
Published: March 2007

AbstractEither augmentation or impairment of left ventricular function has previously been reported in different patients, in response to isometric exercise. To identify the mechanisms associated with these disparate responses, the effects of submaximal sustained handgrip upon left ventricular systolic and diastolic properties were studied in 29 patients during diagnostic catheterization. In 16 patients (group I), ejection fraction, mean Vcf, and the mean systolic ejection rate remained constant, while the ratio of peak systolic pressure to end systolic volume increased significantly from 2.81 ± 0.6 to 3.17 ± 0.6 ml/mm Hg. In 13 patients (group II) ejection fraction declined from 0.6 ± 0.03 to 0.51 ± 0.03, Vcf from 0.96 ± 0.09 to 0.85 ± 0.09 circ/sec, mean normalized systolic ejection rate from 1.79 ± 0.1 to 1.50 ± 0.09 sec−1, and the peak systolic pressure to end systolic volume ratio from 2.23 ± 0.3 to 1.99 ± 0.3 (p < 0.05 for each). Systemic arterial mean pressure increased similarly by 19% and 21 % in groups I and II, respectively (p < 0.05 for each). Systemic vascular resistance increased significantly by 23% in group I and by 5% in group II (p < 0.05). Left ventricular end diastolic volume declined from 85.4 ± 7 to 77.3 ± 11 ml/m2 in group I, while end diastolic and end systolic volumes increased by 13% and 35%, respectively in group II (p < 0.05 for each). In both groups, baseline exponential pressure‐volume relations were similar, though higher intercepts of the pressure‐volume relations upon the Y‐axis suggested greater “diastolic tone”, and steeper volume‐normalized pressure‐volume elasticity relations indicated “stiffer” left ventricular chambers in group II patients. While the incidence of coronary artery disease was similar, both the severity and extent of left ventricular asynergy were greater in group II patients.We conclude that dilatation and deterioration of left ventricular ejection function in response to isometric exercise are causally related to, and comprise a useful predictor of, severe underlying left ventricular asynergy and impaired chamber distensibility.
Premature closure of prosthetic mitral valves as a consequence of gravity
Authors: Busch Ulrich W. , Pechacek Leonard W. , Garcia Efrain , Mathur Virendra S. , Hall Robert J. 
Published: March 2007

AbstractTo determine the influence of gravity on premature closure of prosthetic mitral valves, we studied 17 patients in whom this phenomenon had been observed during routine examination. All patients were in atrial fibrillation and none had aortic incompetence. Patients were studied in multiple positions by means of simultaneous echocardiography, phonocardiography, and cinefluoroscopy. In all patients premature closure was observed when the atrial side of the prosthesis was below the ventricular side, resulting in a downward motion of the occluder inside the valve cage. When patients were studied in positions in which the atrial side of the valve was higher than the ventricular side, premature closure never occurred, even during extremely prolonged diastolic periods. Since minor positional changes, which were found to determine whether premature closure occurred or not, are unlikely to produce significant alterations in pressure and flow across the mitral orifice during diastole, we conclude that position‐dependent premature closure of prosthetic mitral valves in patients with atrial fibrillation is best explained by the effect of gravity on the prosthetic occluder. Examination of such patients in multiple positions should be helpful in distinguishing premature valve closure caused by aortic regurgitation from gravity‐related presystolic closure. Inability to produce premature closure in patients in whom it had previously been demonstrated in the presence of similar R‐R intervals may even prove useful in diagnosing new orifice obstruction.
Sequential study of left ventricular function in aortic valvular stenosis
Authors: Cha Se Do , Naeem Sheikh M. , Maranhao Vladir , Gooch Alden S. , Koehler Eugene 
Published: March 2007

AbstractTo assess the progression of aortic valvular gradients (AVG) and their relation to left ventricular function, 21 patients with aortic valvular stenosis were studied sequentially by cardiac catheterization and left ventriculography. All AVG were obtained from the left ventricle to ascending aortic pullback tracings. The ejection fraction and mean velocity of circumferential fiber shortening were obtained from left ventriculograms. A new onset of syncopal episode was helpful to predict the progression of AVG in five patients, but in others the progression of aortic stenosis was generally not predictable. The left ventricular contractility of these patients was usually normal, but seven patients exhibited the progressive impairment that was not proportional to the change of AVG and was clinically unrecognized. Also, the left ventricular function may deteriorate in the absence of progression of the aortic valvular gradient. Thus, serial hemodynamic studies could be indicated in patients with mild to moderate aortic stenosis even in the absence of new symptoms and signs.