The percent contribution of wall thickening to left ventricular ejection was inversely correlated (r = 0.94) to the midwall radius-to-wall thickness ratio at end diastole.
Observational (n=40)
What are the quantitative relationships between left ventricular wall shortening, wall thickening, and geometry during LV ejection?
The contribution of wall thickening to left ventricular ejection is strongly and inversely correlated to the midwall radius-to-wall thickness ratio at end diastole.
Estimación del efecto: r = 0.94
The quantitative relationships that exist between left ventricular (LV) wall shortening, wall thickening, and geometry during LV ejection are not well defined. We used a mathematical model to measure these parameters in 40 patients with various LV geometries studied by echocardiography. As opposed to wall shortening, the percent contribution of wall thickening to LV ejection (% delta Vh) was 25 +/- 2% in normal subjects; in all the patients, it varied from 18 to 45% and was inversely correlated (r = 0.94) to the midwall radius-to-wall thickness ratio (R/h) of the ventricle at end diastole. On the other hand, the ratio of the quantity of blood ejected per unit of LV wall volume magnitude of delta V/V omega magnitude of varied from 0.20 to 1.20 (normal subjects 0.83 +/- 0.11) and was directly correlated (r = 0.94) to R/h; using independent data in the literature, we also found a similar relationship (r = 0.80) between the ratio of quantity of blood ejected per unit of LV mass (magnitude of delta V/M omega magnitude of) and R/h. Patients with presumably abnormal myocardial function did not satisfy the relationship between magnitude of delta V/V omega magnitude of or magnitude of delta V/M omega magnitude of and R/h.(ABSTRACT TRUNCATED AT 250 WORDS)
Dumesnil et al. (Tue,) conducted a observational in Various left ventricular geometries (n=40). Left ventricular wall thickening and geometry was evaluated on Percent contribution of wall thickening to LV ejection and ratio of quantity of blood ejected per unit of LV wall volume (r = 0.94). The percent contribution of wall thickening to left ventricular ejection was inversely correlated (r = 0.94) to the midwall radius-to-wall thickness ratio at end diastole.