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THE CAPACITY OF THE CORONARY BED IN CARDIAC HYPERTROPHY
1Department of Pathology, Stanford University School of Medicine, San Francisco.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Postmortem human heart perfusion with kerosene reveals coronary flow decreases with age and heart hypertrophy. This reduced coronary capacity may contribute to congestive heart failure in older individuals.
Area of Science:
- Cardiovascular Physiology
- Gerontology
Background:
- Coronary flow is a critical indicator of cardiac health.
- Age and cardiac hypertrophy are known to affect heart function.
- Understanding changes in coronary flow is essential for diagnosing and treating heart conditions.
Purpose of the Study:
- To establish a method for measuring maximum possible coronary flow in human hearts.
- To investigate the impact of aging and cardiac hypertrophy on coronary flow.
- To explore the relationship between coronary capacity and congestive heart failure.
Main Methods:
- Postmortem perfusion of human hearts with kerosene under pressure.
- Measurement of coronary flow rates (cc. per gm. per minute).
- Comparison of flow rates across different age groups and heart weights.
Main Results:
- Normal coronary flow in men under 40 is 3.1 cc./gm./min. at 100 mm. Hg.
- Coronary flow is 35% lower in individuals aged 60-80 compared to younger groups.
- Flow decreases in hypertrophied hearts and is significantly lower in heavier hearts (>600 gm.) across age groups.
Conclusions:
- Reduced coronary capacity with age and hypertrophy may predispose hearts to congestive failure.
- No evidence suggests inadequate oxygen supply or diffusion in hypertrophied hearts.
- Decreased perfusibility with age might be a normal adaptation; young adult hearts have half the perfusibility of 2-year-old infants.
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