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Figure 4 Example of 3:1 ventricular capture during neuromuscular incapacitating (NMI) application. The tracings from top to bottom in each panel are surface electrocardiogram (ECG) lead II, intracardiac right ventricular bipolar electrogram, and blood pressure recording. (A) The entire 5-s burst of NMI delivered at x5 output, Position A. The stimulus artifact overwhelms the surface ECG recordings. The time scale (1,000 ms, upper right of panel) does not allow appreciation of ventricular capture on this panel. There is also a stimulus artifact on the blood pressure tracing, but an overall decrease in blood pressure can be appreciated through the artifacts. (B) The end of NMI application at an expanded time scale (100 ms). Ventricular activation on the right ventricular bipolar recording at a 3:1 ratio to the stimulus artifacts can be readily appreciated. Lower arrows point to the stimulus artifact, and upper arrows point to the right ventricular bipolar electrogram. After termination of the NMI application, normal rhythm resumes with a normal blood pressure pulse.
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