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J Thorac Cardiovasc Surg 1996;111:753-763
© 1996 Mosby, Inc.
SURGERY FOR ACQUIRED HEART DISEASE |
Supported by NIH grant R29HL49398.
Received for publication June 21, 1995 Revisions requested Oct. 3, 1995; revisions received Oct. 11, 1995; Accepted for publication Nov. 8, 1995. Address for reprints: David A. Fullerton, MD, Cardiothoracic Surgery, University of Colorado Health Sciences Center, Box C-310, 4200 E. Ninth Ave., Denver, CO 80262.
Abstract
Increased pulmonary vascular resistance may greatly complicate the perioperative management of cardiac surgical patients. Inhaled nitric oxide may be a promising new therapy to selectively lower pulmonary vascular resistance. The purpose of this study was to examine the effects of inhaled nitric oxide on pulmonary and systemic hemodynamics in cardiac surgical patients. Twenty patients (age 57 ± 6 years) were studied in the operating room after weaning from cardiopulmonary bypass. Mean pulmonary artery pressure, pulmonary vascular resistance, systemic vascular resistance, and mean aortic pressure were determined at four points of data collection: before nitric oxide, with 20 ppm nitric oxide, with 40 ppm nitric oxide, and after nitric oxide. Statistical analysis was by analysis of variance; significance was accepted for p < 0.05. Inhaled nitric oxide produced selective pulmonary vasorelaxation. Pulmonary vascular resistance was lowered from 343 ± 30 before nitric oxide to 233 ± 25 dynes · sec-1 · cm-5 with 20 ppm nitric oxide. Pulmonary vascular resistance was not further lowered by 40 ppm nitric oxide (p < 0.05). Mean pulmonary arterial pressure was 29 ± 1 mm Hg before nitric oxide and was lowered to 22 ± 1 mm Hg by 20 ppm nitric oxide and 21 ± 1 mm Hg by 40 ppm nitric oxide (p < 0.05). Both pulmonary vascular resistance and mean pulmonary arterial pressure returned to baseline after withdrawal of inhaled nitric oxide. Inhaled nitric oxide produced no changes in either systemic vascular resistance or mean aortic pressure. We conclude that nitric oxide may be used as an effective pulmonary vasodilator after cardiac operations. It may be particularly valuable for selectively lowering right ventricular afterload in patients with right ventricular dysfunction. (J THORACCARDIOVASCSURG1996;111:753-63)
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