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Figure 2 Thoracic neuromuscular incapacitating device (NID) discharge. This figure shows a typical example of an NID (model X26) discharge in the thoracic vector configuration. This shows again the corruption of surface electrocardiographic leads in B; however, in the intracardiac electrograms, electrical activity is noted. In C, after the NID discharge, spontaneous return of regular sinus rhythm and blood pressure are shown. Note the immediate return of the rhythm, similar to A. In D and E, the intracardiac electrograms have been magnified and the same duration is shown in both. It is evident in E that the rate is much faster and the rhythm is wider compared with D. The morphology of the tachycardia in E is wider than the morphology in D. There is a constant NID stimulus artifact to electrogram duration as shown in E, with every third NID discharge resulting in stimulation of the heart. Note the loss of blood pressure during the stimulation and the recovery of blood pressure once the discharge is completed. Abbreviations as in Figure 1.