Results 211 to 220 of about 68,210 (242)
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Physiology of Myocardial Contraction
2002The principal function of the heart is to propel oxygenated blood to the peripheral tissues to meet their metabolic demands. The systemic arterial and venous systems provide the conduits. The interaction of the left ventricle (LV) with the arterial and venous systems is therefore integral to the satisfactory performance of this vital function.
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A Note on the Influence of Asynchronous Activation on Myocardial Contraction
Acta Physiologica Scandinavica, 1972AbstractPairs of rabbit papillary muscles were mounted in series to make it possible to study the effects of asynchronous activation on myocardial contraction. The two muscles were connected together via platinum loops hooked to a lever (displacement transducer), the other end of each muscle being fixed to a force transducer.
M. Jóhannsson, Erik Nilsson
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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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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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Application of myocardial contraction fraction
International Journal of Cardiology, 2022Xiaoshang Zhang +3 more
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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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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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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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Effects of Endocardial Damage on Myocardial Contraction
1992The endocardium of the heart has long been regarded merely as a passive interface between underlying myocardium and blood in the cardiac cavities. It comprises a monolayer of closely apposed endothelial cells overlying a thin layer of connective tissue, but it has a relatively large surface area because of its complex trabeculation (Becker, 1964 ...
Ajay M. Shah, Andrew H. Henderson
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Synchronous Myocardial and Diaphragmatic Contractions In a Dog
JAMA: The Journal of the American Medical Association, 1969To the Editor:— Persistent vomiting in a dog evoked an unusual syndrome consisting of simultaneous contraction of the heart and left hemidiaphragm. The condition, positively diagnosed by cinefluorography, was successfully treated with an intravenous infusion of phenobarbital.
Lawrence Gould +2 more
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