A. Carbamylcholine (CCh, 200nmol/L) results in a significant increase in ventricular fibrillation threshold (VFT), which is reversed upon washout of the drug (*p<0.05, n=9) B. This effect is abolished by blockade of the muscarinic receptor with atropine (0.1μmol/L, n=6) and C. nicotinic receptor with mecamylamine (Mec, 10μmol/L, n=6).