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Effects of postural changes on cardiac function in healthy subjects
B P Paelinck1, J W M van Eck, S G De Hert
1Department of Cardiology, University of Antwerp, Wilrijkstraat 10, Edegem, Belgium. bernard.paelinck@uza.be
Summary
Leg lifting improved cardiac function in healthy adults by increasing stroke volume and enhancing diastolic relaxation. Doppler measurements revealed significant improvements in mitral flow and annulus velocities, indicating better myocardial performance.
Area of Science:
- Cardiology
- Physiology
- Echocardiography
Background:
- Assessing cardiac function relies on accurate measurements of hemodynamics.
- Understanding the impact of preload changes on myocardial function is crucial for clinical practice.
Purpose of the Study:
- To analyze Doppler measurements in response to increased venous return.
- To evaluate changes in left ventricular filling and myocardial velocities after leg lifting in healthy middle-aged adults.
Main Methods:
- Left ventricular pulsed Doppler parameters and mitral annulus velocities were measured.
- Measurements were taken at baseline and after passive leg lifting in 24 healthy subjects.
- Color M-mode echocardiography assessed early left ventricular filling.
Main Results:
- Leg lifting increased stroke volume and peak systolic annulus velocity.
- Enhanced peak early mitral flow, flow propagation, and early diastolic mitral annulus velocity (E') were observed.
- Shortened E wave deceleration time and isovolumic relaxation time indicated accelerated relaxation.
Conclusions:
- Leg lifting positively impacted myocardial function, evidenced by increased stroke volume and improved relaxation.
- Flow propagation velocity and diastolic mitral annulus velocities were sensitive to induced changes in cardiac preload.
- Doppler parameters demonstrated the beneficial effects of increased venous return on cardiac performance.