Figure 3: Loss of 1:1 Pacing Capture During Hypokalemia

(A) Representative optical action potentials recorded at progressively faster pacing rates (1.0 to 6.0 Hz) from the Ctrl, MI, and MI/iAL wedges during hypokalemia. (B) Incidence of pacing-induced loss of 1:1 capture in the Ctrl (n = 7), MI (n = 5), and MI/iAL (n = 7) preparations. Abbreviations as in Figure 1.