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Anesth Analg 2000;90:523-530
© 2000 International Anesthesia Research Society


CARDIOVASCULAR ANESTHESIA

Inhaled Nitric Oxide Reduces Pulmonary Vascular Resistance More Than Prostaglandin E1 During Heart Transplantation

Angela Rajek, MD*, Thomas Pernerstorfer, MD*, Johannes Kastner, MD{dagger}, Peter Mares, MD*, Martin Grabenwöger, MD{ddagger}, Daniel I. Sessler, MD*, Georg Grubhofer, MD*, and Michael Hiesmayr, MD*

Departments of *Cardiothoracic and Vascular Anesthesia and Intensive Care Medicine, {dagger}Cardiology, and {ddagger}Cardiothoracic Surgery, University of Vienna, Vienna, Austria; §Department of Anesthesia and Perioperative Care, University of California–San Francisco, San Francisco, California; ||Ludwig Boltzmann Institute for Clinical Anesthesia and Intensive Care, Vienna, Austria; and ¶Outcomes ResearchTM Group

Address correspondence to Dr. Angela Rajek, Department of Anesthesia and Intensive Care (C), Vienna General Hospital, University of Vienna, Wahringer Gurtel 18-20, Vienna A-1090, Austria. Address e-mail to maria.rajek{at}univie.ac.at

Heart transplantation in patients with increased pulmonary vascular resistance is often associated with postbypass right heart failure. We therefore compared the abilities of prostaglandin E1 (PGE1) and inhaled nitric oxide to reduce pulmonary vascular resistance during heart transplantation. Patients undergoing orthotopic heart transplantation for congestive heart failure were randomly assigned to either a PGE1 infusion at a rate of 8 ng · kg· -1min-1 starting 10 min before weaning from cardiopulmonary bypass (CPB) (n = 34) or inhalation of 4 ppm nitric oxide starting just before weaning from CPB (n = 34). Both treatments were increased stepwise, if necessary, and were stopped 6 h postoperatively. Hemodynamic values were recorded after the induction of anesthesia, 10 and 30 min after weaning from CPB, and 1 h and 6 h postoperatively. Immediately after weaning from CPB, pulmonary vascular resistance was nearly halved in the nitric oxide group but reduced by only 10% in the PGE1 group. Pulmonary artery pressure was decreased approximately 30% during nitric oxide inhalation, but only approximately 16% during the PGE1 infusion. Six hours after surgery, pulmonary vascular resistance and pulmonary artery pressure were similar in the two groups. The ratio between pulmonary vascular resistance and systemic vascular resistance was significantly less in the nitric oxide patients at all postbypass times. In contrast, the pulmonary-to-systemic vascular resistance ratio increased approximately 30% in the patients given PGE1. Cardiac output, heart rate, mean arterial pressure, right atrial pressure, and pulmonary wedge pressure did not differ between the groups. Weaning from CPB was successful in all patients assigned to nitric oxide inhalation; in contrast, weaning failed in six patients assigned to PGE1 (P = 0.03).

Implications: Nitric oxide inhalation selectively reduces pulmonary vascular resistance and pulmonary artery pressure immediately after heart transplantation which facilitates weaning from cardiopulmonary bypass.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 2000 by the International Anesthesia Research Society.