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Check of Underlying Rhythm



This strip begins with ventricular pacing, then the pacemaker is turned off and the native rhythm appears.  It is second degree A-V block, two-to-one type.  Notice the P-waves that are generally regular, and note that these P-waves can be marched through the paced part of the strip, as well.  The pacer was working in either VVI or VOO mode, at a rate of 68.