Monophasic action potential recordings during acute changes in ventricular loading induced by the Valsalva manoeuvre.

23 patients undergoing routine cardiac catheterisation procedures (7 with no angiographic evidence of abnormal wall motion or history of MI, 5 with history of MI but normal wall motion, 10 with abnormal wall motion, and 1 transplant recipient).

Valsalva manoeuvre to induce acute changes in ventricular loading (ventricular unloading).

Baseline/resting state (before and after the Valsalva manoeuvre).

Monophasic action potential duration recorded from the left ventricular endocardium.surrogate