Titlebook: Interactive Phenomena in the Cardiac System; Samuel Sideman,Rafael Beyar Book 1993 The Editor(s) (if applicable) and The Author(s), under

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Estimation of Myocardial Mechanical Properties with Dynamic Transverse Stiffnessess was then used to study the effects of myocardial perfusion on passive tissue stiffness and on contractility. In addition, the transverse stiffness was studied in intact canine hearts during diastole, where it was related to the chamber stiffness. Thus, dynamic transverse stiffness appears to all

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Book 1993interacting phenomena, from ionic transport, membrane channels and receptors through cellular metabolism, energy production to fiber mechanics, microcirculation, electrical activation to the global, clinically observed, function, which is measured by pressure, volume, coronary flow, heart rate, shap

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0065-2598 array of interacting phenomena, from ionic transport, membrane channels and receptors through cellular metabolism, energy production to fiber mechanics, microcirculation, electrical activation to the global, clinically observed, function, which is measured by pressure, volume, coronary flow, heart

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Endocardial Coronary Microcirculation of the Beating Heartharge-coupled-device (CCD) camera to visualize the subendocardial microcirculation. Images of the subendocardial microcirculation of a porcine beating heart were successfully observed in all cases. The vascular compression by cardiac contraction decreased the diameter of subendocardial arterioles and venules by about 20%.

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Neuromodulation of Calcium Current by Extracellular ATP in Isolated Ventricular Myocytes it did decrease the Ca. transient. The effects of extracellular ATP were mediated independently of adenosine A. receptors and a pertussis-toxin sensitive G protein. Pharmacological characterization of receptor subtype using ATP analogs was consistent with ATP binding to a P. type receptor.

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Cellular Responses to Electrical Stimulation: A Study Using a Model of the Ventricular Cardiac Actioenhanced supernormal excitability that results in unstable responses (“chaotic activity”) are observed. These observations are consistent with recent experimental results, and the simulations provide insights into the underlying mechanisms at the level of membrane ionic channel kinetics.