It was reported that this cardiac resynchronization therapy defibrillator (crt-d) recorded a real time electrogram with a flat line at atrial pacing as there was no observed activity.Also, a noise like behavior was observed.There were also, missing atrial markers at other episodes that appear as under sensing.A telemetry fallout was suggested as a cause of why atrial pacing deflections were missing.It was attempted to overdrive pace the patient.Also, the patient was in a slow ventricular tachycardia when coming in the clinic.The crt-d remains in service at this time.No adverse patient effects were reported.
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