Effects of Acute Myocardial Ischemia on Intramyocardial Contraction Heterogeneity
نویسندگان
چکیده
منابع مشابه
Effects of acute myocardial ischemia on intramyocardial contraction heterogeneity: A study performed with ultrasound integrated backscatter during transesophageal atrial pacing.
BACKGROUND [corrected] Subendocardial thickening is greater than subepicardial thickening and acute myocardial ischemia mainly impairs the former. Integrated backscatter cyclic variations (IBScv) reflect regional myocardial contractility and are blunted during myocardial ischemia. We hypothesized that stress-induced myocardial ischemia mainly affects subendocardial IBScv. METHODS AND RESULTS ...
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The diagnostic approach of patients with coronary artery disease normally relies on the assessment of global and regional perfusion and contraction in the normal and pathological areas of the myocardium. However, experimental pathophysiological studies have clearly shown that microvascular flow, metabolic consumption and the strength of contraction do not behave homogeneously in the different t...
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A number of recent two-dimensional echocardiographic studies have attempted to relate quantitative changes in short-axis left ventricular radial wall motion to underlying myocardial ischemia/infarction. The significance of temporal variation in the contraction sequence within these ischemic regions in the overall evaluation of segmental left ventricular dysfunction, however, remains undefined. ...
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A number of recent two-dimensional echocardiographic studies have attempted to relate quantitative changes in short-axis left ventricular radial wall motion to underlying myocardial ischemia/infarction. The significance of temporal variation in the contraction sequence within these ischemic regions in the overall evaluation of segmental left ventricular dysfunction, however, remains undefined. ...
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The immediate functional deficit resulting from acute regional myocardial ischemia was evaluated in 40 anesthetized dogs. Ventricular function curves, maximum dp/dt, isovohimetric force-velocity curves, and peak systolic and resting diastolic length-tension curves were assessed at fixed heart rate and constant aortic pressure before and during occlusion of the anterior descending coronary arter...
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ژورنال
عنوان ژورنال: Circulation
سال: 1999
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.100.17.1770