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Influence of age on left ventricular contractility.
A Merino1, E Alegría, R Castelló
1Departamento de Cardiología y Cirugía Cardiovascular, Universidad de Navarra, Pamplona, Spain.
The American Journal of Cardiology
|November 15, 1988
Summary
Aging does not significantly impair resting left ventricular (LV) function. However, younger individuals exhibit a more responsive relationship between pressure and LV dimensions, indicating preserved cardiac elasticity in youth.
Area of Science:
- Cardiology
- Gerontology
- Physiology
Background:
- Aging's impact on left ventricular (LV) function remains debated.
- Understanding age-related changes in cardiac mechanics is crucial for geriatric cardiovascular health.
Purpose of the Study:
- To investigate whether aging affects left ventricular (LV) systolic function.
- To compare cardiac performance metrics between healthy young and elderly adults.
Main Methods:
- Utilized M-mode echocardiography for LV measurements in 10 healthy elderly (group B, >65 years) and 10 young (group A, ~22 years) subjects.
- Assessed blood pressure with an automatic cuff and altered load conditions using sublingual isosorbide dinitrate.
- Calculated relationships between pressure, dimensions, wall stress, and shortening.
Main Results:
- No significant differences in resting end-systolic diameter, end-systolic volume, fractional shortening, or ejection fraction were observed.
- Older adults had higher resting peak systolic pressure and lower heart rates.
- Younger subjects demonstrated steeper pressure-dimension relationships (peak systolic pressure to end-systolic diameter/volume slopes).
Conclusions:
- Resting left ventricular (LV) systolic function appears preserved in healthy aging.
- Age-related differences exist in the heart's response to changes in load, with younger individuals showing greater elasticity.