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Electrocardiographic artifacts during shoulder arthroscopy using a pressure-controlled irrigation pump.

E lectrocardiographic interference which mimics cardiac arrhythmias is reportedly caused by a variety of medical equipment (1–4). Recently, we encountered puzzling baseline electrocardiographic artifacts that simulated atrial flutter or atrial fibrillation during shoulder arthroscopy using a pressurecontrolled irrigation pump (Fig. 1). We concluded that a new technique or equipment using a roller pump can create electrocardiographic artifacts that can mimic atrial flutter or atrial fibrillation.