Key result
Quiescent papillary muscles from cat and kitten hearts use oxygen at rates of 2.84 and 4.05 microliters/mg wet weight/hour, respectively, and require diameters ≤0.64 mm and ≤0.53 mm for adequate diffusion.
The study establishes the baseline oxygen uptake rates for quiescent cat and kitten papillary muscles and defines the maximum muscle diameters allowing adequate oxygen supply by diffusion.
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Muscle diameter limits must be respected in isolated cardiac preparations; leaves open translation to other species and human myocardium.
Cranefield et al. (1960) studied Quiescent cardiac muscle. Oxygen uptake measurement was evaluated on Rate of oxygen uptake. Quiescent papillary muscles from cat and kitten hearts use oxygen at rates of 2.84 and 4.05 microliters/mg wet weight/hour, respectively, and require diameters ≤0.64 mm and ≤0.53 mm for adequate diffusion.