From staff: merge leads that are used to monitor electrocardiogram for procedure were placed on patient (pt).Pt arrived to the interventional lab room in the morning.There were no arrhythmias or artifact noted at this time prior to case start.Once time out was completed, and lidocaine was transdermally given in the right radial territory the rhythm suddenly changed to what appeared to be monomorphic ventricular tachycardia (there was no indication that it was artifact due to no delay prior to change of rhythm and the rhythm remained in this monomorphic state).Doctor was notified and there had been approximately 5-6 screens of this ventricular tachycardia appearing rhythm.Doctor initiated cpr then registered technologist of radiography in room took over cpr.Nurse (rn) applied defib pads while another rn turned on defib equip to prepare for shock if needed.It was noted pt was awake but pt had received some sedation medications.The rhythm continued and to prevent pt from passing out if the rhythm was true pt was placed on defib equipment.An 'all available help was called' and staff were notified that a potential code could be occurring.Prior to charging the defib the room completed a rhythm check and cpr was paused.The defib monitor it showed pt was in sinus tachycardia.Merge screen showed that pt.Was still in ventricular tachycardia like rhythm.Pt reported slight discomfort.Cables were changed out.No harm to pt, pt remained hemodynamically stable.Doctor explained to pt what had occurred and pt verbally stated understanding.Procedure was able to be completed and there were no issues noted.Pt verbalized some discomfort from compressions - pt was medicated for pain.Leads were changed in room to old set of cables.
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