Abstract
Summary
(1) A new method is described for quantitating inotropic effects in the cat papillary muscle preparation. (2) When 9-alpha fluorohydrocortisone (9-a FF) is added to the perfusate in a concentration of 0.5 to 1.0 μg/ml there is observed a direct effect on the muscle as manifested by a marked positive inotropic action and an increased uptake of radioactive Na.
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