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Results 451 - 500 of 515
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Aaltonen H - - 1984
Defective temporal integration for a foveally fixated 100' of arc red (660 nm) Btest flash presented on a 30 cd/m2 yellow ( Schott , OG 530) background was measured in subjects with deuteranopia , as well as in subjects with anomalous trichromacy of the deutan type. The mean integration time ...
Pryor D B - - 1984
The purpose of this investigation was to determine which variables obtained when performing radionuclide angiography predict subsequent survival or total events (cardiovascular death or nonfatal myocardial infarction) in stable patients with symptomatic coronary artery disease (CAD). Univariable and multivariable analyses of 6 variables, including ejection fraction (EF) at rest and ...
Hakki A H - - 1984
The purpose of this study was to assess the relation between the extent of coronary artery disease (CAD) and size of exercise-induced myocardial hypoperfusion in 79 patients with angiographically documented CAD. None of the patients had Q-wave myocardial infarction. Fifty patients had one-vessel disease, ten had two-vessel disease, and 19 ...
Ferro G - - 1984
Percent diastole (%D) was evaluated at rest and during effort (submaximal upright exercise) in 13 normal subjects and in 14 age-matched patients with coronary artery disease (CAD). Systolic time intervals were also simultaneously recorded by using the thermistor pulse transducer. At rest, in both groups, a positive linear regression was ...
Christopher T D - - 1984
A continuous Bayesian model was developed by fitting a beta-function to the frequency distributions of resting ejection fraction, exercise ejection fraction, and change in end-systolic volume during exercise measured by radionuclide angiocardiography in a group of 249 men with coronary artery disease (CAD) and in a group of 56 men ...
Currie P J - - 1983
The incremental value of clinical assessment, exercise electrocardiography (ECG) and biplane radionuclide ventriculography (RVG) in the prediction of coronary artery disease (CAD) was assessed in 105 men without myocardial infarction who were undergoing coronary angiography for investigation of chest pain. Independent clinical assessment of chest pain was made prospectively by ...
DePace N L - - 1983
This study determines whether a mathematical model can be used to assess noninvasively the extent of coronary artery disease (CAD). The model was based on stepwise multivariate discriminant analysis of data obtained in 99 patients from clinical and nonhemodynamic exercise variables, or from radionuclide determination of left ventricular function at ...
Visser C A - - 1983
Two-dimensional echocardiography (2DE) was performed during 30-degree left lateral decubitus bicycle exercise in 52 patients who underwent cardiac catheterization for suspected coronary artery disease (CAD). Adequate echocardiograms were obtained in 39 patients (75%). Thirty-five of these patients underwent radionuclide angiography (RNA) with the same exercise protocol as for echocardiography. Exercise-induced ...
Turner D A - - 1983
Thirty-six patients with chest pain but no myocardial infarction or conduction defects and 4 volunteers (3 normals and 1 with asymptomatic aortic insufficiency) underwent radionuclide angiocardiography. Phase analysis was performed and the standard deviation (SD) ("spread") and skewness ("asymmetry") of the left ventricular (LV) phase histogram determined at rest and ...
Campos C T - - 1983
The accuracy of rest and exercise radionuclide angiocardiography (RNA) and exercise treadmill testing (ETT) for diagnosis of three-vessel or left main coronary artery disease (extensive CAD) was determined in 544 patients. ETT and RNA sensitivities were similar (88% vs 92%, NS), but ETT was more specific than RNA (46% vs ...
Limacher M C - - 1983
Two-dimensional echocardiography (2-D echo) was performed in 73 patients evaluated for coronary artery disease (CAD) and in four normal volunteers before and immediately after a maximal treadmill exercise test. Diagnostic images were obtained from the apical and parasternal windows. In 17 patients with normal coronary arteriograms, ejection fraction (EF) increased ...
Wasserman A G - - 1983
Cold pressor stimulation (CPS) was compared with supine bicycle exercise during radionuclide ventriculography as a procedure for diagnosing coronary artery disease (CAD). Thirty patients were studied. In the 18 patients with angiographically proved CAD, left ventricular ejection fraction (LVEF) decreased a mean of 5.0 +/- 1.0 ejection fraction units (+/- ...
Weiner D A - - 1983
The cardiokymograph (CKG) is a device that has been shown to reflect left ventricular (LV) wall motion abnormalities. Its accuracy in detecting coronary artery disease (CAD) during treadmill exercise testing was assessed in 204 consecutive patients undergoing coronary arteriography. Of the 188 patients with a technically adequate CKG, 146 (78%) ...
Ajisaka R - - 1983
Left ventricular asynergy has been shown to occur commonly in patients with coronary artery disease (CAD) and to be induced or exaggerated by exercise. The purpose of this study is to report on a method to detect asynergy and estimate its severity by M-mode echocardiographic analysis of left ventricular wall ...
Wilson R A - - 1983
Exercise-induced increases in radionuclide-determined pulmonary blood volume (PBV) and thallium lung uptake have been described in patients with coronary artery disease (CAD) and have been shown to correlate with transient exercise-induced left ventricular dysfunction. To compare these 2 techniques in the same patients, 74 patients (59 with and 15 without ...
Baehler E A - - 1983
To determine whether prolonged retention of diaphragms alters Staphylococcus aureus colonization of the lower genital tract, 183 nonpregnant, asymptomatic women were screened for the presence of this pathogen in the cervix and upper vagina. Nineteen (10.4%) had positive cultures: 5 from the vagina, 8 from the cervix, and 6 from ...
Famularo M A - - 1983
Septal Q-wave amplitudes were studied in lead CM5 to evaluate its utility in predicting segmental coronary artery pathoanatomy. Q-wave amplitudes were measured in 41 patients with coronary artery disease (CAD) before and immediately after treadmill exercise. All patients studied had either significant single-vessel CAD (greater than 70% diameter reduction) or ...
Ferro G - - 1983
18 patients with coronary artery disease (CAD) and 21 normal subjects underwent a triangular bicycle exercise test. Systolic time intervals (STI) were calculated at rest and every 2 min during exercise. Under resting conditions, STI were similar in the two groups. During exercise, the ejection time index (ETI), i.e. left ...
Osbakken M D - - 1983
Left ventricular function was evaluated with rest and supine bicycle exercise-multigated blood pool scans in 53 patients who had previously undergone coronary angiography for evaluation of a chest pain syndrome. There were 21 normal patients (less than 25% stenosis in any coronary artery, left ventricular end-diastolic pressure less than or ...
Rowe D W - - 1983
To investigate changes in left ventricular (LV) function during exercise in patients with left bundle branch block (LBBB), 22 patients without a history or physical findings of previous myocardial infarction or LV dysfunction were studied by gated radionuclide ventriculography (GRNV) at rest and during bicycle exercise. Coronary arteriography demonstrated greater ...
Austin E H - - 1982
This investigation assesses prospectively the accuracy of rest and exercise radionuclide angiocardiography (RNA) in detecting coronary artery disease (CAD). By retrospective analysis of 496 patients, optimal RNA criteria were determined for the presence or absence of CAD. Multivariate analysis of patients with normal coronary arteries on catheterization provided a formula ...
Goldman L - - 1982
To determine the incremental value of the exercise test (ETT) for diagnosing coronary artery disease (CAD), we derived a multivariate logistic regression model for the pre-ETT prediction of CAD using data from 3840 patients at Duke University. We then applied the model to 324 patients at the Brigham and Women's ...
Sugiura T - - 1982
The effect of oral propranolol on left ventricular performance during early upright exercise was evaluated by ear densitography in patients with arteriographic coronary artery disease (CAD). Measurements of systolic time intervals differentiated 10 unmedicated patients with CAD (group 1) and 15 patients with CAD taking propranolol (group 3). The patients ...
Hecht H S - - 1982
To evaluate the reproducibility of ejection fraction (EF) and regional wall motion (RWM) analyses by rest and exercise equilibrium radionuclide ventriculography (RNV) in the presence of coronary artery disease (CAD), 18 patients underwent two maximum, multistage supine bicycle exercise studies separated by an interval of 2 weeks. There were no ...
Verani M S - - 1982
To investigate the role of the cold pressor test (CPT) with radionuclide angiocardiography in the diagnosis of coronary artery disease (CAD), we performed angiocardiography in 52 patients (18 with angiographically normal coronary arteries and 34 with CAD) during the resting state, CPT, and supine bicycle exercise (EX). In normal subjects, ...
Ratib O - - 1982
The value of phase analysis of multiple gated acquisition blood pool images for identifying wall motion abnormalities due to stress-induced ischemia was examined. Myocardial segments with an abnormal phase, i.e., delayed onset of wall motion, were localized on a phase distribution image of the LV and the synchrony of LV ...
Lindhagen A - - 1982
A total of 112 patients participated in a prospective study of after-exercise thermography as a screening method for predicting risk of postoperative deep venous thrombosis. The fibrinogen-uptake test was used to detect thrombosis after elective surgery. The incidence of the complication showed no significant difference between patients who had had ...
Ehsani A A - - 1982
The effects of graded isometric exercise on left ventricular performance were characterized in 11 male patients (53 +/- 2 years) with coronary artery disease (CAD) and in 12 normal subjects (11 male and one female 35 +/- 5 years). The echocardiographic indices of left ventricular function at rest were similar ...
Mehta J - - 1982
Platelet function parameters as influenced by exercise stress were evaluated in 22 patients with coronary artery disease (CAD) and in 13 normal subjects. Upon exercise stress, 14 CAD patients exhibited positive tests and eight exhibited negative tests. Platelet counts during exercise increased similarly in normal and CAD patients. Platelet aggregation ...
Pratt C M - - 1981
Attenuation of exercise-induced increases in heart rate and cardiac output by chronic beta-adrenergic blockade has been thought to compromise benefit of exercise training in patients with coronary artery disease (CAD). To assess this important issue, 35 CAD patients were evaluated by a 3-month walk-jog-cycle training program: 14 patients received no ...
Moreyra A E - - 1981
To further elucidate the value of the R wave criteria during the exercise stress test (EST), we studied the direction and magnitude of the changes of the QRS amplitude (delta R) as well as the extent of ST segment depression in 75 patients with coronary artery disease (CAD) and 26 ...
Steele P - - 1981
Platelets may contribute to the pathogenesis of atherosclerotic coronary artery disease (CAD), and platelet reactivity may be activated by exercise. Fourteen men with CAD participated in a double-blind, crossover study of aspirin (ASA), dipyridamole (DPY), ASA-DPY, and placebo. The ASA therapy increased platelet survival time (autologous labelling with 51Cr), but ...
Drummond P D - - 1981
The amplitude of temporal artery pulsation was monitored at rest, after standing from the sitting position and after exercise in 23 normal controls, 10 patients subject to chronic tension headache and 107 migrainous patients. The pulses of migrainous patients did not differ from normal at rest or on standing. On ...
Freeman M R - - 1981
Upright and supine multiple gated cardiac blood pool scintigraphy was performed at rest and during maximum exercise in 37 patients, 15 with normal coronary arteriograms, 12 with coronary artery disease (CAD) without myocardial infarction (MI), and 10 with CAD and previous MI. Heart rate and systolic blood pressure were similar ...
Massie B - - 1981
Thallium-201 myocardial scintigraphy (TMS) has become an increasingly popular noninvasive technique with a high diagnostic specificity, but a somewhat lower sensitivity for coronary disease (CAD) detection. Many centers now routinely employ computer techniques to contrast enhance scintigrams, but the resulting changes in sensitivity and specificity have not been carefully evaluated. ...
Kirshenbaum H D - - 1981
Thallium-201 redistribution pattern after exercise was related to rest and exercise left ventricular regional and global function, measured by radionuclide ventriculography, in 61 patients, 50 with coronary artery disease (CAD). Sixteen patients had exclusively transient thallium defects, suggesting ischemia: in this group, mean left ventricular ejection fraction (LVEF) was 65% ...
Slutsky R - - 1981
To assess left ventricular (LV) response to supine bicycle exercise, we studied 10 normal (group 1). 10 patients with coronary artery disease (CAD) (group 2), 12 patients with severe obstructive lung disease (COPD) (group 3), and eight patients with both CAD and COPD (group 4) by gated equilibrium radionuclide angiography. ...
MacIntyre N R - - 1981
To study to prognostic capabilities of the exercise electrocardiogram (ECG) in a fit, healthy, middle-aged population, 548 members of the U.S. Navy's "1000 Aviator" cohort were exercised to 85% predicted maximum heart rate in 1969 and then followed-up in 1977 for the development of clinically evident coronary artery disease (CAD). ...
Sotobata I - - 1981
The present status of exercise testing in coronary artery disease (CAD) was discussed in respect to test protocols, ECG criteria and lead systems, and hemodynamic responses. Advantages of modern multistage protocols over single-stage ones such as Master two-step tests are obvious in diagnostic accuracy and patient's safety. Clinical significance of ...
Manyari D E - - 1981
Left ventricular function and volume changes during supine isotonic exercise were assessed in 32 patients with coronary artery disease (CAD) and 12 normal subjects by electrocardiographically gated blood pool cardiac scintigraphy. Ejection fraction (EF) in normal subjects was 49 +/- 10% at rest, 54 +/- 10% during intermediate exercise (P ...
Kambara H - - 1980
Fractional myocardial uptake of thallium-201 was estimated by routine scintigraphic evaluation at rest and during exercise in 10 control subjects, 15 patients with coronary artery disease (CAD) and 12 patients with hypertrophic cardiomyopathy (HCM). Fractional myocardial uptake of the total dose administered at rest was 3.59 +/- 0.98% in the ...
Kunkes S H - - 1980
Forty-nine patients undergoing cardiac catheterization for suspected coronary artery disease (CAD) were monitored with a two-channel ambulatory ECG and were given maximal treadmill exercise tests when these were not contraindicated. The ambulatory ECG recordings were evaluated for the number of ST segment deviations after correction for positional changes, and the ...
Pfisterer M E - - 1980
The results of rest and exercise ECG, 201Tl myocardial perfusion imaging and equilibrium radionuclide angiography were analyzed in 71 consecutive patients referred for diagnosis or evaluation of coronary artery disease (CAD). In 45 patients the diagnosis was established either by catheterization or typical history. In this group the overall sensitivity ...
Dei Cas L - - 1980
In order to assess the diagnostic value of stress testing in patients with coronary artery disease (CAD) and ST abnormalities at rest, the results of a bicycle ergometer exercise, were compared in two groups of patients. Group 1 was composed of 58 CAD patients with normal resting ECG; group 2 ...
Lütolf U M - - 1980
Radionuclide measurement of left ventricular ejection fraction (LVEF) response to exercise has been proposed as a way to help identify patients with coronary artery disease (CAD). Previous studies were done using an exercise bicycle or a treadmill and showed that patients with CAD do not increase ejection fraction (EF) to ...
Wolfe L A - - 1980
A 3-stage cycle ergometer exercise test which combines the noninvasive measurement of systolic time intervals (STI's), stroke volume (SV), mean systolic ejection rate (MSER) and blood pressure was administered to 2 groups of middle-aged men. Group 1 included 15 healthy men. Group 2 consisted of 20 men with coronary artery ...
Roosdorp N - - 1979
The correlation of the diagnostic indices FTI and T4/TBG with actual free T4 levels (FT4) was investigated by numerical analysis. It was shown that, FT4 being kept constant, both indices vary with altered TBG concentrations. Thus neither index is truly proportional to FT4. In this respect both indices appear doubtful ...
Brady T J - - 1979
Eighty-nine patients were evaluated for coronary artery disease (CAD) with exercise radionuclide ventriculography (ERV) and contrast coronary angiography. In 70 patients with documented lesions the ERV was abnormal in 65 for a sensitivity of 93%. In patients with normal coronary arteries, the ERV was abnormal in none for a specificity ...
Berger H J - - 1979
The right ventricular (RV) response to upright bicycle exercise was assessed in 16 patients with chronic obstructive pulmonary disease (COPD), in 23 patients with coronary artery disease (CAD), and in 19 normal control subjects. Right ventricular (RV) and left ventricular (LV) ejection fractions were determined noninvasively using first-pass quantitative radionuclide ...
Auchincloss J H JH - - 1979
Treadmill exercise responses of oxygen uptake (VO2), CO2 production (VCO2), and venoarterial CO2 difference (Cv-Ca), measured by CO2 rebreathing (Defares technique) at 1 and 3 min of exercise, were studied in two separate series of control (apparently healthy) and coronary artery disease (CAD) subjects. In the 1-min series there were ...
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