Abstract
Summary
Tension, dT/dt, and transmembrane action potentials were recorded in papillary muscles excised from hearts of control and hyperthyroid cats. The effect of (Ca+ +)e on the action potential was unchanged in hyperthyroid muscles, but the contractility was more sensitive to decreased (Ca+ +)e than the controls. This may provide a clue as to the basis of the increased contractile state documented in hyperthyroid myocardium.
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