It was reported that a patient underwent an atrioventricular nodal reentry tachycardia procedure with a carto 3 system and a map shift without error message occurred.While trying to ablate, a map shift was discovered.The map was showing the his catheter below the ablation catheter.However, on fluoroscopy the his catheter was above the ablation catheter, noted in multiple views.The difference in catheter location before and after map shift was about 1-2 cm.There had been no cardioversion or patient movement prior to the map shift.The user rebooted the workstation and the issue resolved.The root cause cannot be determined.The procedure was completed without patient harm.This event is mdr reportable because such map shifts could potentially be caused by system malfunction, and there is a potential risk to patient.
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