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Age-related changes in normal Chinese hearts
Insights
Heart size increases with age, with body weight being the best predictor. Chinese heart measurements show differences from Caucasian norms, particularly in aortic size.
Area of Science:
- Cardiovascular Anatomy
- Gerontology
- Human Physiology
Background:
- Understanding age-related changes in cardiovascular structure is crucial for clinical practice.
- Previous studies have documented variations in heart dimensions across different populations and age groups.
Purpose of the Study:
- To establish normative data for heart weight, ventricular wall thickness, and valve circumferences in a Chinese population across a wide age range (10-90 years).
- To investigate sex-based differences and age-related trends in these cardiac parameters.
- To compare findings with existing data from Caucasian populations.
Main Methods:
- Autopsy specimens from 507 normal hearts were analyzed.
- Measurements included heart weight, ventricular wall thickness, and valve circumferences.
- Indexed left ventricular wall thickness (indexed to Body Surface Area - BSA) was calculated.
- Statistical analysis was performed to assess age and sex differences.
Main Results:
- Heart weight increased with age and was generally greater in males, with a reversal in the 6th to 8th decades.
- Body weight was the strongest predictor of heart weight.
- Ventricular wall thickness showed no significant sex difference, but indexed left ventricular wall thickness was higher in females from the 6th to 9th decades.
- Mean valve circumference was greater in males, significantly for tricuspid valves in the 9th decade.
- Pulmonary valve circumference consistently exceeded aortic valve circumference.
Conclusions:
- This study provides age- and sex-specific reference values for cardiac dimensions in Chinese individuals.
- Significant differences were observed compared to Caucasian populations, notably the absence of age-related aortic dilatation.
- These findings have implications for the clinical evaluation of cardiovascular health in Chinese populations.
Abstract:
The heart weights, ventricular wall thickness and valve circumferences were measured in 507 autopsy specimens of normal hearts from persons aged from 10 to 90 years. The heart weights increased with age and were greater in the males than in the females, except from the 6th to 8th decades where they were reversed. The body weight was the best predictor of heart weight. The ventricular wall thickness in males did not differ significantly from that in females. The values of the indexed left ventricular wall thickness (i.e. values divided by BSA) in the females exceeded those in the males from the 6th to 9th decades. The mean valve circumference was greater in the males but it was significant (P < 0.05) only for the tricuspid valves at the 9th decade of life. The pulmonary valve circumferences were greater than the aortic for all decades and the ratio of the aortic to pulmonary valve circumference remained constant. In the clinical evaluation of the specimens of Chinese hearts, the absence of the aged-related dilatation of the aorta described in Caucasian hearts should be duly taken into account.