[Ultrasound-induced myocardial preconditioning: analysis of its effectiveness and mechanisms].

It has been shown that exposure of the isolated rat heart perfused according to Langendorff to therapeutic ultrasound (210 kHz and 0.5-1.5 W/cm2 ) induces a cardioprotective response similar to ischemic preconditioning. This reduces the infarct size and improves the postischemic systolic and diastolic function. The ATP-sensitive K+ channel blocker glybenclamide abolished the protection afforded by ultrasound; in contrast, the free radical scavenger N-2-MPG did not influence the ultrasound-induced cardioprotective response.