Key result
In isolated canine hearts with chronic pressure overload, the slope of the end-systolic volume to ejection pressure regression line decreased by 47% compared to controls, indicating improved capability to generate pressure.
Population
12 isolated canine heart preparations from mongrel puppies, average age 5.7 weeks, average body weight 3.7…
Comparison
Chronic pressure overload induced by ascending… vs Control canine hearts without aortic constriction.
Design
Preclinical
Follow-up
40 weeks
Authors
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Highlights need for geometry-adjusted Emax metrics in hypertrophy; leaves open human translation and clinical relevance.
Effect estimate: 47% decrease
Absolute Event Rate: 0.095% vs 0.186%
p-value: p=<0.01
Concentric hypertrophy from chronic pressure overload maintains stroke volume despite reduced end-diastolic volume due to improved pressure generation, demonstrating that Emax is dependent on ventricular geometry.
Nakamura et al. (1984) studied Concentric hypertrophied heart after chronic pressure overload (n=12). Chronic pressure overload (aortic constriction) vs. Control canine hearts was evaluated on Slope of the regression line of end-systolic volume on ejection pressure (47% decrease, p=<0.01). In isolated canine hearts with chronic pressure overload, the slope of the end-systolic volume to ejection pressure regression line decreased by 47% compared to controls, indicating improved capability to generate pressure.