Journal of the American College of Cardiology
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J. Am. Coll. Cardiol. · Nov 1992
Review Comparative StudyEvaluation of mitral leaflet motion by echocardiography and jet direction by Doppler color flow mapping to determine the mechanisms of mitral regurgitation.
This study was designed to assess the accuracy of two-dimensional and Doppler echocardiography in determining the mechanism of mitral regurgitation, as compared with direct inspection of the valve at operation. ⋯ Echocardiography before mitral valvuloplasty provides a dynamic appraisal of the mechanism of dysfunction, enabling the surgeon to systematically understand the dysfunction and successfully apply the correct procedures to eliminate mitral regurgitation without valve replacement.
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J. Am. Coll. Cardiol. · Nov 1992
Multicenter Study Comparative StudyRight bundle branch block, persistent ST segment elevation and sudden cardiac death: a distinct clinical and electrocardiographic syndrome. A multicenter report.
The objectives of this study were to present data on eight patients with recurrent episodes of aborted sudden death unexplainable by currently known diseases whose common clinical and electrocardiographic (ECG) features define them as having a distinct syndrome different from idiopathic ventricular fibrillation. ⋯ Common clinical and ECG features define a distinct syndrome in this group of patients. Its causes remain unknown.
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J. Am. Coll. Cardiol. · Nov 1992
Comparative StudyEffects of quinidine on vascular resistance and sympathetic nerve activity in humans.
The purpose of the present study was to test the hypothesis that intravenous quinidine, unlike procainamide, causes direct vasodilation and reflexly mediated increases in sympathetic nerve activity. ⋯ These data show that quinidine, unlike procainamide, causes vasodilation directly and, when given intravenously, is associated with baroreflex-mediated increases in sympathetic nerve activity.
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J. Am. Coll. Cardiol. · Nov 1992
Comparative StudyEffects of steal-prone anatomy on intraoperative myocardial ischemia. The SPI Research Group.
Our study objective was to determine whether the presence of steal-prone anatomy conferred an increased risk in the development of intraoperative myocardial ischemia. ⋯ These findings demonstrate that under strict hemodynamic control the presence of steal-prone anatomy does not confer an increased risk in the development of intraoperative myocardial ischemia.
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J. Am. Coll. Cardiol. · Nov 1992
Comparative StudyPhysiologic changes with maximal exercise in asymptomatic valvular aortic stenosis assessed by Doppler echocardiography.
We hypothesized that the physiologic response to exercise in valvular aortic stenosis could be measured by Doppler echocardiography. ⋯ Doppler echocardiography allows assessment of physiologic changes with exercise in adults with asymptomatic aortic stenosis. A majority of subjects show a rest-exercise response that closely parallels the predicted relation between Vmax and Qmax for a given orifice area. The potential utility of this approach for elucidating the relation between hemodynamic severity and clinical symptoms deserves further study.