[The positive inotropic effect after washout of acetylcholine in isolated rabbit hearts].

Aim: To study the regular pattern and mechanism of positive inotropic effect after washout of ACh (rebound of myocardial contractile force) in isolated rabbit hearts.

Methods: The changes of myocardial contractile force after perfusion and washout of ACh were observed in isolated Langendorff perfused rabbit hearts.

Results: Maximum rebound rate induced by ACh of 10(-8)-10(-3) mol/L were 2.