Key result
Volume-overload hypertrophy without hypertension did not significantly increase minimal coronary vascular resistance per unit weight of left ventricle compared to controls (16.4 vs 14.7).
Why the study?
Does volume-overload hypertrophy without hypertension increase minimal coronary vascular resistance in awake dogs?
Population
21 mongrel dogs (13 with volume-overload hypertrophy induced by complete heart block, 8 controls)
Comparison
Volume-overload hypertrophy produced by creating… vs Control dogs without heart block/hypertrophy
Design
Preclinical
Follow-up
6 to 7 weeks
Authors
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Suggests hypertension-specific vascular changes drive coronary resistance in pressure-overload LVH; hypothesis-generating for human translation.
Does volume-overload hypertrophy without hypertension increase minimal coronary vascular resistance in awake dogs?
Absolute Event Rate: 16.4% vs 14.7%
Volume-overload hypertrophy without hypertension does not increase minimal coronary vascular resistance per unit weight of left ventricle, suggesting that vascular hypertrophy related to chronic hypertension causes the increased resistance seen in pressure-overload hypertrophy.
Gascho et al. (1982) studied Volume-overload left ventricular hypertrophy (n=21). Volume-overload hypertrophy (via complete heart block) vs. Control dogs was evaluated on Minimal coronary vascular resistance per unit weight of left ventricle during maximal vasodilatation. Volume-overload hypertrophy without hypertension did not significantly increase minimal coronary vascular resistance per unit weight of left ventricle compared to controls (16.4 vs 14.7).
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