Key result
Leg lifting in healthy middle-aged subjects significantly increased stroke volume from 69 to 74 ml (P<0.01) and improved myocardial function and relaxation parameters.
Why the study?
Does leg lifting alter Doppler measurements of cardiac function in healthy subjects?
Observational (n=24)
Does leg lifting alter Doppler measurements of cardiac function in healthy subjects?
Leg lifting increases cardiac preload, which improves myocardial function and significantly alters flow propagation and diastolic mitral annulus velocities in healthy subjects.
Answers are grounded in this paper and cite their sources.
Findings in healthy adults warrant no practice change; leaves open utility of postural maneuvers for diastolic assessment in patients.
AIMS: To analyse the response of Doppler measurements to increased venous return in middle-aged healthy subjects. METHODS AND RESULTS: Left ventricular pulsed Doppler parameters, colour M-mode of early left ventricular filling and septal mitral annulus velocities were measured at baseline and after leg lifting (n=24). Leg lifting resulted in increased stroke volume (69 +/- 14 to 74 +/- 14 ml, P<0.01) and peak systolic annulus velocity (6.8 +/- 1.3 to 7.3 +/- 1.1 cm/s, P<0.01). Leg lifting enhanced peak early (E) mitral flow (74 +/- 13 to 80 +/- 14 cm/s, P<0.01), flow propagation (53 +/- 10 to 59 +/- 13 cm/s, P<0.01) and E' diastolic mitral annulus velocity (10.8 +/- 2.2 to 11.7 +/- 2.0 cm/s, P<0.01). There was a shortening of E wave deceleration time (178 +/- 27 to 163 +/- 27 ms, P<0.01) and isovolumic relaxation time (76 +/- 11 to 68 +/- 10 ms, P<0.01). However, individual changes in Doppler parameters differed among subjects. CONCLUSIONS: Leg lifting improved myocardial function as manifested by increase in stroke volume, systolic annulus motion and acceleration of relaxation. Flow propagation velocity and diastolic mitral annulus velocities were influenced by the induced change in cardiac preload as well.
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Bernard P. Paelinck (2003) conducted an observational in Healthy (n=24). Leg lifting vs. Baseline was evaluated on Stroke volume (p=<0.01). Leg lifting in healthy middle-aged subjects significantly increased stroke volume from 69 to 74 ml (P<0.01) and improved myocardial function and relaxation parameters.
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