Search Results
Results 451 - 500 of 929
< 5 6 7 8 9 10 11 12 13 14 15 >
Okazaki Y - - 1993
OBJECTIVES: The aim of this study was to test the hypothesis that the warm-up phenomenon is attributable to a reduction of increased myocardial oxygen consumption rather than to increased coronary blood flow during exercise. BACKGROUND: The underlying mechanism of the warm-up phenomenon is not elucidated. METHODS: Thirteen patients with effort ...
Herreras O - - 1993
The propagation of sustained potential shifts associated with spreading depression (SD) was studied by microelectrodes placed in diverse layers at different locations in hippocampus of anesthetized rats. SD was induced by raising interstitial potassium concentration ([K+]0) focally in the CA1 region of the dorsal hippocampus either by microdialysis or by ...
Myers J - - 1993
Although important strides have been made in related procedures, exercise ECG remains an invaluable tool in the initial assessment of coronary disease and yields a great deal of prognostic information. Access to limited health care resources often hinges on its outcome. Proper methodology is critical to patient safety and to ...
Jajoo U N - - 1993
In 1983, we carried out a cross-sectional, rural community based study and highlighted an abysmally low prevalence of probable coronary heart disease in resting electrocardiogram. A seven year follow-up (1983-1990) of 179 suspects showed no morbidity or mortality from coronary heart disease. Eighty one out of 98 suspects tested negative ...
Montorsi P - - 1993
Patients with syndrome X have been found to have an abnormal coronary blood flow reserve. The physical performance during exercise, however, has been incompletely investigated. Cardiopulmonary exercise testing (CPX) is a reliable noninvasive method to provide indexes of lung, heart, circulation, and muscle functions. In 15 patients (10 women) with ...
Schmidt P - - 1993
We studied the release of immunoreactive somatostatin, VIP, and galanin during net aboral propulsive complexes (NAP) in isolated, perfused, 80-cm segments of porcine ileum. Net aboral propulsive complexes were induced by controlled infusion of liquid (perfusion medium, 3.5 ml/min) into the proximal opening of the ileum segment. In response to ...
Toyoda T - - 1993
To evaluate the prognostic value of exercise-induced silent ST-segment depression, 157 patients who had suffered myocardial infarction underwent symptom-limited exercise testing and coronary angiography. Patients were divided into 3 groups according to the presence or absence of ischemic ST-segment depression and angina during exercise testing. Group A patients had ST-segment ...
Ribisl P M - - 1993
To determine which computer ST criteria are superior for predicting patterns and severity of coronary artery disease during exercise testing, 230 male veterans were studied who had both coronary angiography and a treadmill exercise test. Significant (p < or = 0.05) differences in computer-scored ST criteria were observed among patients ...
Mickley H - - 1993
The relation between early out-of-hospital ambulatory ST-segment monitoring, clinical characteristics, predischarge maximal exercise testing and cardiac events was determined in 123 consecutive men (age 55 +/- 8 years) with a first acute myocardial infarction (AMI). During 36 hours of ambulatory recording 11 +/- 5 days after AMI 23 patients (19%) ...
Janota M - - 1993
Hypoxaemic precordial ST mapping was compared with precordial exercise mapping in a group of 64 patients. During hypoxaemia, IHD patients show ischaemic changes in ST maps similar to those found in exercise maps, and a significant increase in the sums of ST depressions. The test can be recommended to detect ...
Visser F C - - 1993
To assess the value of exercise stress testing to predict the functional result of revascularization, 90 patients were evaluated by coronary angiography and exercise testing pre and postoperatively. Patients were classified on the basis of the postoperative angiogram in a group with successful surgery and a group with unsuccessful surgery. ...
Horner S M - - 1993
There is a pressing need for a non-invasive marker of restenosis following percutaneous transluminal coronary angioplasty. Computerised measurement of restenosis has not been used in conjunction with exercise test variables reflecting maximum exercise capacity. Thus we investigated thirty consecutive patients undergoing repeat coronary angiography for restenosis who had a satisfactory ...
Barthwal S P - - 1993
One hundred seventy patients with ischaemic heart disease (IHD) and 141 healthy controls were evaluated to assess the diagnostic significance of T I < T III and TV1 > TV6 as compared to widening of QRS-T angle. Number of cases with abnormal widening of QRS-T angle was significantly higher (P ...
Jespersen C M - - 1993
The importance of maximal versus submaximal exercise testing and the significance of heart failure on the prognostic value of exercise-provoked ST-segment depression > or = 0.1 mV was studied in 143 patients recovering from acute myocardial infarction. Patients were exercise tested prior to discharge and follow up lasted for up ...
Pilhall M - - 1993
BACKGROUND: The relation between QRS changes during exercise and ischemic heart disease is controversial. The present investigation addressed whether exercise QRS changes are related 1) to myocardial ischemia or necrosis, 2) to possibly confounding factors such as baseline QRS size and changes in heart rate and ST magnitude during exercise, ...
Barlow C W - - 1992
Routine stress electrocardiography has been criticised for yielding too many so-called 'false-positive' results because ST/T changes that develop during and after exercise are prevalent. Recent studies in our institution indicate, however, that the time-course behaviour patterns of these ST/T configurational 'abnormalities' after exercise are different from those reflecting myocardial ischaemia ...
Pilhall M - - 1992
Changes in the QRS segment during exercise have repeatedly been suggested to provide diagnostic information with respect to ischaemic heart disease, but the subject is controversial. In order to study the possibly confounding effects of gender, age, resting ECG and exercise performance, 50 healthy subjects were investigated with computerized vectorcardiography ...
Kanemoto N - - 1992
A patient is reported in whom exercise induced reversible ischemic left anterior fascicular block and far advanced right bundle branch block. Master's two step exercise test for pre-operative check-up revealed significant ST elevation in leads V1-5, negative U waves in leads V3-5 and fascicular blocks with retrosternal anginal chest pain. ...
Martin T W - - 1992
It is uncertain whether dobutamine echocardiography is a better test than exercise electrocardiography for the detection of coronary disease in patients who can exercise. We compared the hemodynamics, sensitivity, and specificity of these tests in 24 patients, 16 with coronary disease and 8 controls. The tests were performed within six ...
Brown S P - - 1992
To compare the oxygen cost of submaximal exercise on the Stairobic stepping (SS) machine with bench stepping (BS), 12 healthy men and women (mean age 23 years) underwent six different five minute exercise bouts that were randomly assigned. Tests were conducted using standard open circuit calorimetry. SS at 40 and ...
Morise A P - - 1992
In the primary care setting, exercise testing is frequently used to evaluate patients with known or suspected coronary artery disease. Appropriate utilization requires knowledge of the indications as well as the contraindications and interpretation of the variables generated by the test. While ST segment changes are widely regarded as the ...
De Cock C C - - 1992
To assess the reproducibility of variables with prognostic value from exercise testing, two symptom-limited treadmill exercise tests were performed in 76 consecutive patients at 2 weeks (predischarge) and 6 weeks after myocardial infarction. In addition, cardiac catheterization was performed at 6 weeks. Exercise duration showed a moderate increase from 7.9 ...
Hambrecht R P - - 1992
Maximal hemodynamic and ventilatory responses using cycle and treadmill ergometer were compared in 52 asymptomatic patients with angiographically proved coronary artery disease. Moreover, test sensitivity with respect to ST-segment depression and typical angina pectoris were compared between exercise modes used. Exercise tests were performed on different days in randomized order. ...
Marraccini P - - 1992
This study evaluated the effect of pirenzepine, an M1 antimuscarinic agent, on exercise duration and ischemic threshold in patients with angiographically documented coronary artery disease and clear-cut ST depression (greater than 0.2 mV, 0.08 second after the J point) during ergometric stress testing. Twenty-five patients, mean age 56 +/- 8 ...
Blunn G W - - 1992
106 unicondylar knee replacement tibial components were retrieved and analyzed for the amount and type of polyethylene wear. Three different designs were retrieved which had essentially the same femorotibial conformity. Each design showed a characteristic failure pattern. The polyethylene of PCA tibial components showed serious delamination after only short durations, ...
Kurata C - - 1992
This study was undertaken to determine whether the site of ST depression on 12-lead exercise electrocardiography can identify the ischemic site assessed by myocardial Tl-201 emission computed tomography in 409 patients with transient defects. ST depression in some leads was more frequent in those with inferior or lateral ischemia than ...
Sanderson J E - - 1992
The effectiveness of epidural spinal electrical stimulation has been studied in 14 patients with severe intractable angina unresponsive to standard therapies including bypass grafting. After implantation of the neurostimulator units the patients were assessed by a symptom questionnaire, treadmill exercise testing and right atrial pacing. There was a significant improvement ...
Ellestad M H - - 1992
We studied the time course of ST segment depression during and after exercise testing in 462 subjects who also had coronary angiograms. Sixty-three percent of patients with late onset-early offset ST depression, previously reported to be likely to have false positive tests, had significant coronary artery disease, and 32% had ...
Quek D K - - 1992
Silent myocardial ischaemia is now well-recognised in patients with symptomatic coronary artery disease. Its pathogenesis remains speculative, though diminished sensitivity to pain is thought to be one of the mechanisms involved. Because cardiovascular autonomic dysfunction occurs frequently in diabetic patients, we postulate that it contributes towards painless myocardial ischaemia among ...
Zdrenghea D - - 1992
Arm exercise test (AET) is described as an alternative to the classical leg exercise test (LET). The value of these two types of exercise was studied in a group of 32 patients aged 34 to 65 years. The patients performed LET for several reasons and, after 24 hrs, AET under ...
Pilhall M - - 1992
In order to find new ischaemic parameters, the spatial changes of the Frank vectorcardiogram were continuously analysed with a new, highly precise vectorcardiographic method during, and immediately after a maximal exercise test. This was done in 18 young healthy males, and 18 patients with scintigraphic reversible ischaemia. During exercise, different ...
Morise A P - - 1992
The accuracy of ST/heart rate (ST HR) index was evaluated in patients presenting for exercise electrocardiography with suspected coronary disease. In all, 420 patients (235 men and 185 women) with normal electrocardiograms at rest underwent exercise testing, followed within 3 months by coronary angiography. The sensitivity and specificity for standard ...
Mazzotta G - - 1992
In 183 consecutive patients with recent, uncomplicated myocardial infarction, the following variables were associated with 4-year cardiac death: haemodynamic decompensation with exercise (P = 0.01), left ventricular ejection fraction at rest (P = 0.004) and at peak exercise (P = 0.003), persistent ST segment elevation at rest in the area ...
Miranda C P - - 1992
Multiple lead systems are shown to have a higher sensitivity than that of single leads for detecting coronary artery disease (CAD) during exercise testing, but the value of ST-segment depression isolated to the inferior leads is questionable. To ascertain the diagnostic accuracy of inferior limb lead II compared with that ...
Pascual E E - - 1992
For nearly 30 years clinicians have assumed that diuretic therapy, per se, even in the absence of clinical hypokalemia, can cause false-positive exercise ST-segment responses. The precept has stubbornly persisted in the literature and in the day-to-day interpretation of exercise tests in clinical settings. The assumption probably originated with very ...
Kurita A - - 1992
To verify whether plasma beta-endorphin and bradykinin affects the pathophysiology of myocardial ischemia and the perception of cardiac pain, 35 patients with coronary artery disease were subjected to treadmill testing and 48-hour Holter ECG monitoring to measure their pain thresholds. Patients were divided into two groups during exercise testing: group ...
Frandsen F - - 1992
This investigation was carried out in an effort to analyze the influence of various degrees of ischaemic heart disease (IHD) on cardiovascular and physical performance. Assessment of the severity of IHD was based on observations obtained routinely during exercise tests (ST segment response and systolic blood pressure response). The study ...
Spinelli L - - 1992
The relationship between either heart rate or diastolic time and ST segment depression has been evaluated during supine and upright exercise in 16 coronary artery disease patients. Diastolic perfusion time and ST segment depression were related by a linear regression, which was independent of exercise posture. The entity of ST ...
Solari A J - - 1992
The different morphological types of ZW pairs have been classified in three main types according to the relative extension of the free segment of the Z axis: 1, "long asynaptic segment;" 2, "medium asynaptic segment;" and 3, "equalized." Pre- and post-pairing types have also been defined. Frequencies of each type ...
McInnis K J - - 1992
The importance of low-level (warm-up) exercise for reducing exercise-induced myocardial ischemic symptoms in patients with coronary artery disease is well-recognized by clinicians. Whether altering the abruptness of exercise, such as that which occurs during different frequently used testing protocols, affects myocardial ischemic variables and maximal exercise capacity has not been ...
Moussa I - - 1992
This study tested the hypothesis that discriminant function analysis of clinical and exercise-test variables including computerized ST measurements could improve the prediction of severe coronary artery disease. Secondary objectives were to demonstrate the effect of digoxin and/or resting electrocardiographic (ECG) abnormalities, and to evaluate the relative importance of ST measurements ...
Yale C E - - 1992
Primary pneumatosis cystoides intestinalis (PCI) is an uncommon, usually benign condition whose natural course is poorly understood and which can sometimes produce significant changes in a patient's cecum and sigmoid colon. In this study, PCI was produced by monocontaminating the peritoneal cavities of adult germfree rats with Clostridium perfringens. These ...
Zanolla L - - 1992
A double-blind, placebo-controlled, cross-over trial of oral gallopamil was performed in 10 patients with stable angina. Gallopamil significantly increased mean exercise time and 1-mm ST time. The rate-pressure product was increased at 1-mm ST time, but unmodified at the highest comparable work load and at peak exercise. The ST segment ...
Ridocci F - - 1992
To determine the effects of exercise training on exercise-induced ischemia in patients following myocardial infarction, the experience of 13 patients with exercise-induced ST depression, who were moderate-to-high intensity trained for 1 year, has evaluated. After training, the maximum ST depression was significantly less (1.9 +/- 0.8 vs. 1.1 +/- 0.8 ...
Detrano R - - 1992
In order to evaluate the variability in the diagnostic accuracy of the exercise electrocardiogram, a meta-analytic database derived from a review of 147 publications and a multicenter database derived from 2,826 angiographic referrals were analyzed. Wide variability in sensitivity and specificity were found from the meta-analytic review (standard deviations of ...
Dimauro J - - 1992
The effects were investigated of high intensity short duration exercise and anabolic steroid treatment on the medial gastrocnemius muscle of female rats. Twelve rats were divided equally into four groups, exercise with and without steroid administration and sedentary with and without steroid administration. Animals were made to swim for 5 ...
Ellestad M H - - 1992
The contribution of relative lead strengths to ST depression during exercise was evaluated in 334 patients who had both a treadmill stress test and an angiogram. Patients were referred for exercise testing for the evaluation of suspected or known coronary artery disease. This was accomplished by comparing the magnitude of ...
Ahlawat S - - 1991
Acute effects of ethyl alcohol on left ventricular performance, haemodynamic and electrocardiographic response to treadmill exercise test were studied in 20 patients with chronic stable angina. Following ingestion of 80 ml of whisky (43% ethyl alcohol by volume) the mean heart rate and rate-pressure product decreased significantly at the end ...
Mooss A N - - 1991
Digoxin causes false-positive ST depression during exercise stress testing, but it is unknown if digoxin produces ST depression during ambulatory electrocardiographic monitoring. Fifty healthy volunteers underwent both exercise stress testing and ambulatory electrocardiographic monitoring before and after 14 days of digoxin (0.25 mg/day) administration. Significant ST depression was defined as ...
el-Tamimi H - - 1991
BACKGROUND: The mechanism responsible for exercise-induced myocardial ischemia early after successful coronary angioplasty (PTCA) is poorly understood. METHODS AND RESULTS: Twelve patients who underwent one-vessel PTCA were studied. Exercise testing was performed before and on day 7 after PTCA, which was repeated after 10 mg sublingual isosorbide dinitrate if the ...
< 5 6 7 8 9 10 11 12 13 14 15 >