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Ann Thorac Surg 1995;60:556-560
© 1995 The Society of Thoracic Surgeons

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Original Articles: Cardiovascular

Successful Management of Junctional Tachycardia by Hypothermia After Cardiac Operations in Infants

Department of Pediatric Cardiology, Children's Hospital, and Division of Thoracic and Cardiovascular Surgery, Hannover Medical School, Hannover, Germany

Accepted for publication April 11, 1995.

Background. Junctional ectopic tachycardia is an early postoperative complication after intracardiac repair of congenital heart disease, especially in infants. Because of the high ventricular rate and the usually poor response to antiarrhythmic drugs, this condition is associated with a high morbidity and mortality. The purpose of this study was to assess the safety and efficacy of moderate body surface hypothermia in the treatment of postoperative junctional ectopic tachycardia in infants.

Methods. Six consecutive infants with postoperative junctional ectopic tachycardia (mean age at operation, 14 weeks) were treated with surface cooling. The decision to start treatment was based on the definition of a crit- ical heart rate (180 to 200 beats/min) in the presence of junctional ectopic tachycardia diagnosed according to established criteria. Moderate hypothermia (rectal temperature between 32° and 34°C) was achieved by placing ice bags on the child's body surface. The patients were sedated, mechanically ventilated, and paralyzed.

Results. Mean interval between diagnosis of tachycardia and initiation of hypothermia was 4 hours. Rectal temperature was rapidly (within 1 hour) lowered to 32° to 34°C in all 6 patients. This significantly lowered the tachycardia rate from 219 ± 27 beats/min to 165 ± 25 beats/min (mean ± standard deviation; p < 0.001). Three patients with signs of low cardiac output had restoration of stable hemodynamics once the tachycardia rate had been decreased by hypothermia. Cooling was maintained for a period of 24 to 88 hours (mean, 59 hours). No serious side effects were observed.

Conclusions. Early institution of moderate hypothermia by body surface cooling was a safe and efficient measure to control ventricular rate in infants with postoperative junctional ectopic tachycardia.

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