Key result
Right coronary arterial blood flow and myocardial oxygen consumption are significantly lower per unit weight of tissue than in the left ventricle, and right ventricular oxygen extraction increases during stress unlike the left ventricle.
Why the study?
Does right ventricular oxygen metabolism differ from left ventricular oxygen metabolism in response to cardiac loading in open-chest dogs?
Population
24 open-chest adult mongrel dogs weighing >20 kg
Comparison
Cardiac loading via atrial pacing, isoproterenol… vs Baseline state and comparison between right and…
Design
Preclinical, Order of loads was completely randomized
Authors
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Highlights RV reliance on oxygen extraction during stress unlike LV; leaves open translation beyond this canine model.
Does right ventricular oxygen metabolism differ from left ventricular oxygen metabolism in response to cardiac loading in open-chest dogs?
Absolute Event Rate: 8.6% vs 4%
p-value: p=<0.01
Right ventricular oxygen metabolism relies on both increased coronary blood flow and increased oxygen extraction to meet higher oxygen demands, unlike the left ventricle which relies primarily on increased blood flow.
Shozo Kusachi (1983) studied Normal physiology (animal model) (n=24). Left ventricle (compared to right ventricle) vs. Right ventricle was evaluated on Mean myocardial oxygen consumption (MVO2) at baseline (ml/min/100g) (p=<0.01). Right coronary arterial blood flow and myocardial oxygen consumption are significantly lower per unit weight of tissue than in the left ventricle, and right ventricular oxygen extraction increases during stress unlike the left ventricle.
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