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. Author manuscript; available in PMC: 2010 Sep 3.
Published in final edited form as: Circulation. 2008 Aug 25;118(11):1123–1129. doi: 10.1161/CIRCULATIONAHA.107.738013

Figure 1.

Figure 1

Simultaneous MAP recordings from RV and LV endocardium. A, An example of VF induction by delivery of CLVF in the RV. Note the discordant APD alternans between the RV and LV of the 4 premature action potentials (S2 through S5), which is followed by VF. APDdiff was 153 ms in this example. B, Delivery of CLVF in the same dog but during high-dose verapamil infusion. Note the relatively uniform duration of the premature action potentials and the absence of discordant APD alternans. APDdiff was reduced to 32 ms, and VF was not inducible by delivery of CLVF.