Results 161 to 170 of about 83,346 (209)
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Myocardial Contraction and Long QT Syndrome
Trends in Cardiovascular Medicine, 2011The long QT syndrome is an inherited cardiac arrhythmic disease that has been regarded as a purely electrical disease. However, sporadic reports have indicated that myocardial contraction abnormalities are present in these patients. Novel echocardiographic techniques such as strain echocardiography have made it possible to further elucidate cardiac ...
Kristina H, Haugaa, Thor, Edvardsen
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The influence of endocardial endothelium on myocardial contraction
Trends in Pharmacological Sciences, 1992A novel unidentified agent, provisionally named 'endocardin', has been shown to be released from endocardial endothelium. Endocardin has a unique prolonging effect on myocardial contraction. In contrast, endothelium-derived relaxing factor released from endocardial endothelium has the opposite effect of abbreviating contraction.
J A, Smith +3 more
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Effect of vanadate on myocardial force of contraction
Basic Research in Cardiology, 1980Ammonium vanadate (NH4VO3; 50-1000 microM) increases the force of contraction of isolated electrically driven cat papillary muscles in a concentration-dependent manner. The positive inotropic effect (PIE) of NH4VO3 became significant at 50 microM and was maximal at 500 to 1000 microM.
H, Scholz +3 more
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Application of myocardial contraction fraction
International Journal of Cardiology, 2022Xiaoshang, Zhang +3 more
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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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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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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, E, 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.
Beata M, Wolska, David M F, Wieczorek
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[Cardiac myosins and myocardial contraction].
Giornale italiano di cardiologia, 1987The contractile properties of cardiac muscle cells are determined by the molecular composition of the contractile apparatus and in particular by the structure of myosin. Three isoforms of myosin heavy chains have been recently identified in the mammalian heart: alpha and beta myosin heavy chains, present in atrial and ventricular myocardium, and nodal ...
S, Schiaffino, L, Gorza
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