Radioisotope angiocardiography was performed by peripheral venous or pulmonary arterial injection of 99mTc pertechnetate in 64 patients with acute myocardial infarction. End-diastolic volume determined with this technic averaged 101 + 7 (+ SEM) ml/m2 and was elevated (>90 ml/m2) in 47 patients. Initial ejection fraction (EF) averaged 0.38 + 0.03 and was reduced (<0.52) in 58 patients. The exten...

Angiographically determined changes in segmental wall motion (SWM) and ejection fraction (EF) are sensitive indices of left ventricular (LV) function. To compare the effects of exercise on LV function, first pass radionuclide angiocardiography was used before and during maximal upright bicycle stress in patients with nonsignificantly stenosed coronary arteries, and in those with greater than 75...

• In previous studies from this and other laboratories, rapid biplane angiocardiography has been utilized to quantify left ventricular chamber volume and volume changes in man and experimental animals." Arvidsson measured left ventricular stroke volume in several subjects with valvular heart disease in the course of extensive studies on left atrial volume changes, and Chapman and coworkers' det...

Twenty-six patients with constrictive pericarditis have been investigated and treated-by surgical in addition to medical methods in 22, and by medical management alone in four. A tuberculous aetiology was proved in only two patients but was probable in 10 others. One patient developed constriction of the heart following a stab wound, which caused a haemopericardium, and one after organization o...

Angiographically determined changes in segmental wall motion (SWM) and ejection fraction (EF) are sensitive indices of left ventricular (LV) function. To compare the effects of exercise on LV function, first pass radionticlide angiocardiography was used before and during maximal upright bicycle stress in patients with nonsignificantly stenosed coronary arteries, and in those with > 75% stenosis...

Radioisotope angiocardiography was performed by peripheral venous or pulmonary arterial injection of 99mTc pertechnetate in 64 patients with acute myocardial infarction. End-diastolic volume determined with this technic averaged 101 + 7 (+ SEM) ml/m2 and was elevated (>90 ml/m2) in 47 patients. Initial ejection fraction (EF) averaged 0.38 + 0.03 and was reduced (<0.52) in 58 patients. The exten...

We used first-pass radionuclide angiocardiography to assess filling fraction during the first third of diastole, peak filling rate and peak filling rate during the first third of diastole as indexes of left ventricular diastolic performance at rest and after upright bicycle exercise in 32 normal patients and 68 patients with coronary artery disease. The mean filling fraction was unchanged from ...

IN THE PAST, clinical assessment of left ventricular function has been largely limited to the measurement of pressure and flow. Recently methods have been developed for the in vivo measurement of left ventricular volumes in man.1-3 Rackley and associates4 have described a method for determining left ventricular mass. The determination of left ventricular volume and mass are of definite help in ...

A new method of determining pulmonary-to-systemic flow ratios (Qp/Qs) in patients with left-to-right shunts using radionuclide angiocardiography is described. It involves the analysis of pulmonary time-activity histograms using a gamma-variate model. It appears to be simple, relatively atraumatic, and superior to the methods using C2/C1 ratios because, in addition to accurately detecting the pr...

In the study of cardiodynamics, the role of specific radiographic techniques is assuming increasing significance. The development of kymography and electrokymography results from the effort to record the deviations in individual portions of the cardiac silhouette as correlated with the electrocardiogram. However, the movements of the silhouette fail to give an accurate representation of the wor...