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. 2007 Mar 1;581(Pt 1):277–289. doi: 10.1113/jphysiol.2007.128637

Figure 1. Initiation of arrhythmic activity by premature ventricular depolarizations occurring in response to extrasystolic (S2) stimulation in hypokalaemic hearts.

Figure 1

A, extrasystolic (S2) stimulation protocol. Epicardial monophasic action potential (MAP) recordings from a heart exposed to hypokalaemic (3.0 mm K+) test solution for 20 min at S1S2 intervals that were decremented between 120 and 115 ms (B), and to intervals just greater and including the ventricular effective refractory period (VERP) (C).