Results 341 to 350 of about 1,121,875 (382)
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Effects of myocardial contraction on ultrasonic backscatter before and after ischemia.
American Journal of Physiology, 1984To determine whether contraction and relaxation influence quantitative myocardial ultrasonic backscatter we measured systolic and diastolic integrated backscatter separately in 10 pentobarbital-anesthetized dogs with defined, paced heart rates, before ...
B. Barzilai +4 more
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Effect of tetanic myocardial contraction on coronary pressure-flow relationships.
American Journal of Physiology, 1993Cardiac contraction causes a decrease in coronary flow. Despite many studies, it is still not clear what mechanism or mechanisms are responsible for this flow decrease.
J. Livingston, J. Resar, F. Yin
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The role of tropomyosin in the regulation of myocardial contraction and relaxation
Pflügers Archiv - European Journal of Physiology, 2003Studies over the last 30 years have demonstrated the essential nature of the evolutionarily highly conserved tropomyosin (TM) protein. TM-deficient cells neither function properly nor survive, and mutations within this protein impair severely its function within the sarcomere.
David F. Wieczorek, Beata M. Wolska
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Indices of myocardial oxygen consumption for isotonic contraction
American Journal of Physiology-Heart and Circulatory Physiology, 1979To investigate the model-independent mechanical determinants of energy expenditure, a respirometer was constructed to study isolated feline papillary muscles. Mechanical parameters recorded were the distance of shortening (deltaL), peak velocity of shortening (Vp), mean velocity of shortening (V), tension-time index (TTI), afterload (P), and the ...
C. R. Lambert, P. Posner
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European Heart Journal, 1994
The effect of coronary insufficiency on the myocardial contraction pattern was studied in 11 thoracotomized cats using apical long axis echocardiograms and cross-oriented segments in the anterior midwall.
S. Birkeland +4 more
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The effect of coronary insufficiency on the myocardial contraction pattern was studied in 11 thoracotomized cats using apical long axis echocardiograms and cross-oriented segments in the anterior midwall.
S. Birkeland +4 more
semanticscholar +1 more source
Application of myocardial contraction fraction
International Journal of Cardiology, 2022Xiaoshang Zhang +3 more
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Myocardial contraction band necrosis in stranded cetaceans
Journal of Comparative Pathology, 1998The term contraction band necrosis describes focal hypercontraction and lysis of small groups of myocardial cells. Contraction band necrosis of the myocardium was identified in 100% of 52 whales and dolphins (cetaceans) stranded along the western coast of the Gulf of Mexico between April 1991 and November 1996.
B.S. Turnbull, D.F. Cowan
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Velocity of contraction as a determinant of myocardial oxygen consumption
American Journal of Physiology-Legacy Content, 1965In 12 dogs on right-heart bypass with heart rate, stroke volume, and aortic pressure constant, the velocity of contraction was augmented comparably by three fundamentally distinct interventions in the same heart: 1) sustained postextrasystolic potentiation produced by paired, electrical stimulation; 2) norepinephrine infusion; and 3) calcium infusion.
Eugene Braunwald +4 more
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Modeling Ischemia-Induced Dyssynchronous Myocardial Contraction
Anesthesia & Analgesia, 2006Left ventricular (LV) contraction dyssynchrony is not easily quantified. We previously described a model for quantifying LV dyssynchrony that referenced regional amplitude and phase angles to global LV systole using esmolol-induced regional dyskinesis.
Michael R. Pinsky, David P. Strum
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The Intrinsic Control of Myocardial Contraction — Ionic Factors
New England Journal of Medicine, 1971THE heart is an organ that is notable for its ability to adapt very rapidly to changes in demand even in the absence of extrinsic neural or humoral stimuli.
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