Search Results
Results 551 - 600 of 923
< 7 8 9 10 11 12 13 14 15 16 17 >
Berkenboom G - - 1990
In order to assess the role of alpha-adrenergic coronary tone in exercise-induced ischemia, 23 patients with chronic stable angina underwent, after coronary angiography, a symptom-limited supine exercise test on a cyclo-ergometer. After recovery, either phentolamine (for the first nine patients) or indoramin (for the following nine patients) was directly injected ...
Josephson R A - - 1990
An abnormal ST segment response to treadmill exercise has a low predictive value for future coronary events (angina pectoris, nonfatal myocardial infarction, or cardiac death) in apparently healthy individuals. To determine whether the conversion from a normal to an abnormal ST segment response might identify individuals at high risk for ...
Gaglione A - - 1990
Coronary vasomotion of normal, stenotic, and poststenotic vessel segments was studied in 18 patients with coronary artery disease at rest, during submaximal bicycle exercise, and 5 min after sublingual nitroglycerin or oral isosorbide-dinitrate (ISDN) spray. Patients were divided into two groups: group 1 consisted of 10 patients with no premedication ...
Hayat N H - - 1990
Exercise electrocardiography with or without thallium-201 scintigraphy was performed (pre-hospital discharge) in 66 asymptomatic survivors of a first inferior myocardial infarction (IMI). Although coronary angiography revealed an 82% incidence of multivessel coronary artery disease (MV-CAD) in the total cohort, the sensitivity of exercise ECG for MV-CAD in the group with ...
Thompson R F - - 1990
Treadmill testing (TMT) was performed on 76 frail but ambulatory subjects, between 64 and 84 years of age, who had common health problems contributing to physical limitations but had no clinically apparent heart disease. The subjects achieved a mean symptom-limited maximal heart rate of 140.1 +/- 2.07 (SEM) beats per ...
Tanaka K - - 1990
The purpose of the present study was to document that the coronary collateral vessels do not open immediately upon the occurrence of myocardial ischemia. A multistage bicycle exercise was performed to determine a maximal tolerable work load until the onset of angina and significant ST segment depression in 10 patients ...
Ferro G - - 1990
The present study has been performed to assess the effects of alinidine on diastolic duration during exercise in chronic coronary artery disease. Twelve male patients with stable effort angina and without previous myocardial infarction were studied. They received alinidine or placebo in a double-blind randomized crossover trial for 3 days ...
Kadel C - - 1989
The value of exercise ECG in predicting the occurrence of restenosis after successful transluminal coronary angioplasty (PTCA) was investigated in 398 patients with exercise tests of comparable workload before, immediately after and within 6 months after PTCA. In patients with normalized exercise ECG (n = 166) restenosis was observed in ...
Mulcahy D - - 1989
In this article we discuss the place of ambulatory ST-segment monitoring in the investigation of the patient following coronary angioplasty. Particular attention is focused on the relationship between the results of exercise testing (the standard technique in the evaluation of the post-angioplasty patient) and ambulatory ST-segment monitoring, in order to ...
Deckers J W - - 1989
The diagnostic accuracy of the following methods of analysing exercise tests were evaluated: (a) the cumulative area of ST segment depression during exercise normalised for workload and heart rate (exercise score); (b) discriminant analysis of electrocardiographic exercise variables, workload, and symptoms; and (c) ST segment amplitude changes during exercise adjusted ...
Mulcahy D - - 1989
To establish the relation between treadmill exercise testing and ambulatory St segment monitoring in the detection of ischemia in patients with coronary artery disease, and to assess whether standard medical therapy affects any such relation, 277 patients with stable angina and angiographically documented coronary artery disease were studied with treadmill ...
Aronow W S - - 1989
A positive exercise ECG with greater than or equal to 1.0 mm ischemic ST-segment depression, limited exercise duration, persistence of ischemic ST-segment depression past 8 minutes in the recovery period, and exertional hypotension is associated with increasing severity and extent of CAD. The sensitivity and specificity of the exercise ECG ...
Allred E N - - 1989
The purpose of this study was to determine, using more objective evidence than that reported in previous studies, whether or not exposures to carbon monoxide that produce approximately 2% or 4% blood carboxyhemoglobin levels cause an exacerbation of myocardial ischemia during a progressive exercise test. The objective measurements were based ...
Kurita A - - 1989
Bradykinin, alone or in combination with prostaglandin, is thought to produce pain in patients with coronary heart disease. To elucidate this further, we have investigated and compared serum bradykinin, TXB2 and 6 KPGF1 alpha levels in patients with silent myocardial ischemia (SMI, n = 18), painful myocardial ischemia (PMI, n ...
Okin P M - - 1989
The ST-segment/heart rate (ST/HR) slope has markedly improved the accuracy of the exercise electrocardiogram for the identification and quantification of coronary artery disease. However, clinical use of this technique has been limited by time-consuming manual ST-segment measurements and calculator-based linear regression analyses after testing. To assess the accuracy of on-line ...
Papazoglou N - - 1989
The purpose of this study was to evaluate jogging in place as an electrocardiographic exercise test. Jogging in place continuously recorded via an ordinary single-channel electrocardiograph was compared with the Bruce treadmill protocol with a three-channel monitor and recorder in 141 cases with a wide spectrum of chest complaints. Agreement ...
Mark D B - - 1989
To evaluate the clinical correlates and long-term prognostic significance of silent ischemia during exercise, 1,698 consecutive symptomatic patients with coronary artery disease who had both treadmill testing and cardiac catheterization were studied. These patients were classified into three groups: Group 1 = patients with no exercise ST deviation (n = ...
Pupita G - - 1989
The effects of different types of exercise on ischemic threshold were studied in 33 patients with chronic stable angina, documented coronary artery disease, and reproducible positive exercise test results. On average, ST segment depression developed at a significantly higher heart rate and rate-pressure product when the standard modified Bruce protocol ...
Bhave S - - 1989
Thirty-one boys between the ages of 9 and 17 years were subjected to submaximal exercise stress testing on a treadmill using the Bruce's protocol. All the children completed the test with the younger group (9-13) reaching Grade III and the older group boys (14-17) reaching Grade IV on an average. ...
Galassi A R - - 1989
Patients with syndrome X (typical angina pectoris, positive exercise tests [greater than or equal to 1 mm of ST-segment depression], no evidence of coronary spasm and angiographically normal coronary arteries) have a reduced coronary flow reserve due to inappropriate dilatation of small resistive vessels. To assess whether alpha-adrenergic mechanisms play ...
Brüggemann T - - 1989
The accuracy of ST-segment analysis in a direct-recording ambulatory ECG monitoring (AEGG) system (CardioData Mk 4 with recorder CardioData PR3) was compared with that obtained in a standard ECG recorder. Twenty two patients with coronary heart disease and a positive exercise test were submitted to a second bicycle exercise test ...
Pupita G - - 1989
The long-term course of angina and the electrocardiographic signs of ischemia were assessed in 13 patients (10 women and 3 men, mean age 49 +/- 6 years) with typical angina pectoris, positive exercise tests, no evidence of coronary spasm and angiographically normal coronary arteries (syndrome X). Clinical and electrocardiographic parameters ...
Okin P M - - 1989
To assess the effect of exercise protocol and number of monitoring leads on the ability of the ST/HR slope and delta ST/HR index to identify three-vessel coronary artery disease, the exercise ECGs of 50 patients who had coronary arteriography were reviewed. Test performance of the ST/HR slope using the Cornell ...
Gianrossi R - - 1989
To evaluate the variability in the reported diagnostic accuracy of the exercise electrocardiogram, we applied meta-analysis to 147 consecutively published reports comparing exercise-induced ST depression with coronary angiography. These reports involved 24,074 patients who underwent both tests. Population characteristics and technical and methodologic factors, including publication year, number of electrocardiographic ...
Lehmann K G - - 1989
Complete injury to the cervical spinal cord results in total disruption of central sympathetic outflow. Although ventricular repolarization can be significantly influenced by disorders of autonomic function, the effects of cervical sympathectomy are unknown. Therefore, 40 subjects with complete chronic spinal cord injury were prospectively divided into 2 groups, half ...
Deckers J W - - 1989
The diagnostic accuracy of conventional exercise electrocardiography was compared with exercise algorithms specifically aimed at application in females, with R wave and heart rate adjusted ST-segment changes, and with discriminant analysis. A symptom-limited bicycle exercise test was performed by 189 females without previous infarction with a normal electrocardiogram (ECG) at ...
Gordon J B - - 1989
We studied the vasomotion of epicardial coronary arteries during exercise and tested the hypotheses that abnormal vasoconstriction is related to the presence of atherosclerosis and may be related to endothelial dilator dysfunction. During cardiac catheterization quantitative coronary angiography was performed in 21 patients during supine bicycle exercise. 21 of 28 ...
Marraccini P - - 1989
This study assessed both group and individual variability of ECG exercise stress test in patients with effort angina. Forty-five untreated patients with typical effort angina, without evidence of spontaneous angina, with a positive exercise stress test (ST depression greater than 0.2 mV) and angiographically documented coronary artery disease were studied. ...
Michaelides A P - - 1989
The significance of exercise-induced ST segment depression in supraventricular extrasystoles (STx), in the preceding sinus beats (STs), as well as the significance of the difference between the two of them (STx-s), was studied in 96 patients with angiographically documented coronary artery disease (CAD) (group A)--34 with myocardial infarction (group A1) ...
Zilberman A - - 1989
In 25 patients with asymptomatic exercise-induced positive stress tests heart rate, blood pressure, double product, exercise duration, and ST-segment changes were studied prior to and 4 weeks after administration of 120 mg of verapamil therapy three times a day. Significant improvement was observed at rest and at peak exercise in ...
Endo Y - - 1989
The correlation between the treadmill exercise test results and the hemodynamic data of 152 patients with previous myocardial infarction were investigated. The patients were classified into 4 groups as follows: H1 left ventricular end-diastolic pressure (LVEDP) less than or equal to 12 mmHg and cardiac index (CI) greater than or ...
Tesch P A - - 1989
Percutaneous muscle biopsies were obtained from the vastus lateralis of physically active men (n = 12) 1) at rest, 2) immediately after an exercise bout consisting of 30 maximal voluntary knee extensions of constant angular velocity (3.14 rad/s), and 3) 60 s after termination of exercise. Creatine phosphate (CP) content ...
Ardissino D - - 1989
To investigate the significance of hyperventilation-induced ST segment depression, 329 consecutive patients with angina and documented coronary artery disease who underwent hyperventilation and exercise tests during pharmacologic washout were studied. The hyperventilation test induced ST segment depression in 79 patients. In 36 of these 79 patients, the electrocardiographic changes occurred ...
Nagarajan R - - 1989
Isoproterenol, as an exercise simulating agent, was evaluated in twenty subjects, ten normal volunteers and ten with Coronary Artery Disease (CAD). Both groups were evaluated using 0.5 ug increments of intravenous infusion of isoproterenol every 3 minutes with computerised ECG (Marquette Electronics--MAC PC) monitoring. The normal volunteers did not have ...
Ono S - - 1989
To elucidate the clinical significance of the exercise-induced negative U-wave (NU) in patients with anterior myocardial infarction, we compared the angiographic and scintigraphic findings in 15 patients with and 20 patients without NU, and obtained the following results: 1) On coronary angiography, all patients in the NU (+) group showed ...
Henriksson P - - 1989
The aim of this study was to predict cardiovascular complications in patients with prostatic cancer treated with oestrogen. A randomised prospective study of oestrogen therapy versus orchiectomy was performed. Patients with pre-existing cardiovascular morbidity were excluded (16%). Prior to the initiation of therapy, patients were subjected to exercise stress tests, ...
Brayman A A - - 1989
The postulate that electric field-induced bioeffects in the root model system are related to the induction of 60-Hz transmembrane potentials (Vim) was quantitatively tested. Root segment growth rate data and the calculated mean 60-Hz Vim which would arise in the cortical cells of a segment under specified exposure conditions were ...
Rotenberg Z - - 1989
Values for total lactate dehydrogenase (LD, EC 1.1.1.27) activity and LD isoenzymes were determined in serum from 56 patients and 40 healthy subjects before and 24, 48, and 72 h after they performed an exercise test. The mean (for all four times) total LD activity concentration and proportion of LD-2 ...
Esquivel L - - 1989
The sensitivity of ST-segment depression on the electrocardiogram during exercise is influenced by the level of effort. Whether such is the case with thallium-201 imaging (initial defect or redistribution) has not been established. Accordingly, the prevalence of these parameters was evaluated in 288 patients (age 59 +/- 10 years, 88% ...
Romano M - - 1989
The assessment of chronic pharmacological treatment of stable angina requires serial exercise stress testings. It is well known that exercise tolerance can be improved by the training effect of performing repeated testings. Our study investigated the values of heart rate, systolic blood pressure, rate-pressure product, and duration of exercise at ...
McConnell M E - - 1989
In order to evaluate potential electrocardiographic (ECG) correlates of ST-segment depression during exercise in patients with sickle cell anemia (SS), 43 subjects, aged 5-23 years, underwent submaximal exercise testing. Eight (19%) had ST-segment depression on the exercise ECG during submaximal exercise. These eight patients had significantly lower hemoglobin levels than ...
Greene K R - - 1989
The experimental evaluation of the fetal ECG waveform as a method of fetal surveillance has been based largely on experimentally induced hypoxia. The present data, obtained from chronically instrumented fetal lambs, includes three fetuses monitored throughout spontaneous labour, six fetuses with spontaneously developed long-term ST waveform changes and another three ...
Pratt C M - - 1989
Women have a notoriously high rate of false positive exercise test results. Since the exercise ST segment response has low specificity in predicting CAD in women, we examined additional exercise parameters in 200 women with a history of chest pain compatible with angina and having ST segment depression greater than ...
Graves G M - - 1989
Postoperative ileus is characterized by decreased gastrointestinal myoelectric activity and motility. Metoclopramide was used to treat experimentally induced postoperative ileus in six dogs. Contractile activity was monitored by extraluminal strain gages on the pyloric antrum and proximal segment of the duodenum, and myoelectric activity was measured by recording bipolar electromyograms ...
Eggeling T - - 1988
The analysis of ST segment changes during Holter monitoring is one important diagnostic method for detection and diagnosis of silent myocardial ischaemia. To assess the specificity and sensitivity of ST segment alterations as a diagnostic tool, 106 healthy medical students (43 females, 57 males, aged 18-36 years, mean age 26 ...
Pfisterer M - - 1988
Demonstration of ischaemic left ventricular dysfunction in the absence of chest pain should provide important confirmation of silent myocardial ischaemia in patients with asymptomatic ST segment changes. For this purpose, a new portable scintillation probe (VEST) similar to a miniaturized nuclear stethoscope combined with a Holter ECG was evaluated. After ...
Rotman B - - 1988
Long-term ambulatory electrocardiographic monitoring [AEM] of the ST segment is clinically the most practical test for the documentation and quantification of myocardial ischaemia. However, there is still some controversy about the validity of ST measurements in Holter monitoring. Therefore, in the present study, in a series of 26 patients with ...
Günther H - - 1988
Seventy-nine patients with angiographically documented coronary artery disease were studied with exercise ECG and Holter ECG for ischaemic ST segment changes. Fifty-four patients (68.3%) had ischaemia on exercise, 48 patients (62.0%) had ischaemic ST segment depression during Holter monitoring. Twenty-four (30%) of the patients with a positive exercise test and ...
Neumann E - - 1988
The diagnosis of silent ischaemic heart disease may be important in men as well as in women. However, diagnosing women by exercise ECG is limited due to the higher rate of false positive results. For improving diagnostic validity the following investigations were done. In 310 women, aged 41-63 years (mean ...
Moczurad K W - - 1988
Silent ischaemic ST segment depression and heart rate changes during ambulatory 24 h electrocardiography and bicycle exercise stress testing were studied 8-12 weeks after the first myocardial infarction in 22 patients, aged 36-65 years (X = 50.2). During Holter monitoring it was found that 18 patients had 64 episodes of ...
< 7 8 9 10 11 12 13 14 15 16 17 >