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Effect of standing and squatting on echocardiographic left ventricular function
European Journal of Cardiology
|January 1, 1980
Summary
Posture significantly impacts left ventricular (LV) dimensions and function in children. Standing decreases LV diameter and cardiac output, while squatting increases them, indicating adaptive cardiovascular responses.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Physiology
Background:
- Understanding how posture affects cardiac function is crucial for assessing cardiovascular health in children.
- Previous studies have explored postural effects on adult cardiovascular systems, but pediatric data is less comprehensive.
Purpose of the Study:
- To investigate the acute effects of postural changes (supine, standing, squatting) on left ventricular (LV) dimensions and function in healthy children.
- To assess the adaptive cardiovascular responses to different postural challenges.
Main Methods:
- Echocardiography was used to measure LV diameter and function in 14 healthy children.
- Measurements were taken in the supine position (baseline), during standing, and during squatting.
Main Results:
- Standing from a supine position led to a significant decrease in LV end-diastolic diameter, stroke index, and cardiac index, with a concurrent heart rate increase.
- Squatting resulted in increased LV cavity dimensions, stroke index, and cardiac index, alongside a rise in mean blood pressure and a slight heart rate decrease.
- While most contractility indices remained unchanged, some patients showed increased LV contractility in response to postural changes, suggesting sympathetic nervous system involvement.
Conclusions:
- Postural changes elicit significant, predictable alterations in LV dimensions and cardiac output in healthy children.
- These findings highlight the dynamic cardiovascular adaptability in pediatric populations and provide a reference for normal responses.