Wall-thickness and midwall-radius variations in ventricular mechanics.
نویسندگان
چکیده
منابع مشابه
The relation between left ventricular geometric patterns and left ventricular midwall mechanics in hypertensive patients.
To evaluate the alteration of myocardial contractility in hypertensive patients with different left ventricular geometric patterns by the end-systolic stress-midwall fractional shortening relation. Echocardiography was applied to study the left ventricular geometry and cardiac function among 117 cases of essential hypertension, with 45 normal cases as control(s). Left ventricular mass index (LV...
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Left ventricula wall thickness (LVWT) was measured by ultrasound in 100 subjects without heart disease. The data on both diastolic (LVWT,) and systolic (LVWT,) thickness were related to sex, age, weight, height, heart volume (HV), and ECG voltage criteria. LVWT, was greater in men (P<0.01) but LVWT, was of the same magnitude in both sexes. In both sexes LVWT, and LVWT, increased with age (P<0.0...
متن کاملTissue structure and ventricular wall mechanics.
Considering that the left ventricle is a thick-walled body that maintains its volume while reducing intracavitary volume by two thirds, it should come as no surprise that the ventricular wall thickens during systole and that there is a transmural gradient in wall thickening. Wall thickening on the inner wall may exceed values of 40% measured by a variety of techniques. These values far exceed t...
متن کاملLeft ventricular midwall mechanics in systemic arterial hypertension. Myocardial function is depressed in pressure-overload hypertrophy.
BACKGROUND Left ventricular (LV) midwall geometry has been described conventionally as the sum of the chamber radius and half of the wall thickness; this convention is based on the assumption of uniform transmural thickening during systole. However, theoretical considerations and experimental data indicate that the inner half (inner shell) of the LV wall thickens more than the outer half (outer...
متن کاملChauges in Ventricular Volume, Wall Thickness and Wall Stress During Progression of Left Ventricular Dysfuncthu
To assess the long-term changes in cardiac function iu N tomatic patients with severe left veatricuiar dysfunction, left ventricular (clneangiography) and right ventricular (radionuelide angiography) function were assesxd at baseline in 49 patients enrolled in the prevention arm of the Studies of Left Ventricular Dysfuoction. After an average follow-up period of 12.4 months, 30 patients (11 ran...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1989
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.86.9.2996