Ventricular fibrillation caused by electrocoagulation during laparoscopic surgery.

A 35-year-old man with morbid obesity was admitted to our hospital to undergo gastric banding gastroplasty by the laparoscopic approach. Aside from his morbid adiposity, with a body mass index (BMI) of 49.9 kg/m2, the patient was healthy. During the procedure, he developed ventricular fibrillation (VF) while a diathermic knife was being used. After defibrillation, his heart rate returned to normal. The postoperative clinical course was uneventful, and there was no evidence of permanent heart failure. Although the VF could have been caused by patient- or material-related variables, it was most likely the result of unwanted electrical effects. Specifically, the occurrence of an arc between the patient's tissue and the tip of the electrode during cutting in the coagulation mode can lead to low-frequency current. The modified low-frequency current may produce arrhythmias. Thus, the use of the coagulation mode to cut tissue in the cardiac region during laparoscopic procedures could increase the risk for arrhythmias. An understanding of the physical principles of electrosurgery, as well as familiarity with the equipment and its various functions, is essential for the patient's safety. In addition, cardioversion equipment should be readily available on every surgical unit.