During an atrial fibrillation (af) paroxysmal ablation procedure, a pericardial effusion occurred.After placing the mapping and ablation catheter in the right atrium, the catheter was showing distortion.The tip of the catheter was deflected down and on the system it showed the tip was pointing upward.The mapping catheter showed elongation of splines after setting baseline of the sheath filter.After retaking the respiratory compensation, the image was normal.After the double transseptal puncture, the left atrium was mapped.Ice was checked after mapping and a pericardial effusion was noted and the patient became hypotensive.The mapping catheter was removed, and a pericardiocentesis was performed to stabilize the patient.It was thought the effusion occurred while mapping in the la due to incorrect catheter appearance on the ensite system.The patient is currently in stable condition and has been discharged.
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