Non-Linear Pressure-Volume Relation in Left Ventricle.
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چکیده
منابع مشابه
Non-linear pressure-volume relation in left ventricle.
A thick-walled elastic cylinder contracting symmetrically is used as a model for the myocardium. The active force generated by the myocardium during systolic contraction is represented by body force (force/unit volume of myocardium). A mathematical formalism previously developed and based on large deformation analysis is used to derive a quadratic equation to represent the non-linear pressure v...
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Left ventricular (LV) pressure-volume (PV) relations of quasi-isobaric contractions around zero transmural pressure were studied with a new volumetric method. Left ventricles of isolated cross-circulated dog hearts were connected to a large air tank through the mitral annulus. The volume of the air space was changed with a volume servo pump to oscillate the transmural pressure (P) around zero. ...
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The effects of mechanical changes in loading conditions on the left ventricular end-systolic pressure-volume relation (ESPVR) were studied in nine open-chest dogs, including three dogs studied before and after beta-adrenergic blockade. Left ventricular pressure was measured with a micromanometer, and left ventricular volume was measured with a conductance catheter. ESPVRs were obtained by incre...
متن کاملDiastolic pressure-volume relationship in the canine left ventricle.
Analysis of the passive pressure-volume filling curve of the left ventricle demonstrates that heart size and ventricular geometry exert major effects on the pressure-volume curve in the absence of changes in intrinsic muscle stiffness. Because the pressure-volume relationship is curvilinear, both quantitative and qualitative comparison of pressure-volume curves from different hearts is difficul...
متن کاملThe pressure-volume and stiffness-pressure relations in the isolated rabbit left ventricle.
A balloon was introduced into the isolated rabbit left ventricle with intraventricular volume being controlled by a feedback amplifier. Pressure-volume and stiffness-pressure relations were determined as intraventricular volume was changed. These ventricular relations were explained according to the theory of wall muscle mechanics.
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ژورنال
عنوان ژورنال: Japanese Heart Journal
سال: 1991
ISSN: 0021-4868,1348-673X
DOI: 10.1536/ihj.32.337