Inhaled nitric oxide, right ventricular efficiency, and pulmonary vascular mechanics: selective vasodilation of small pulmonary vessels during hypoxic pulmonary vasoconstriction.

Published

Journal Article

OBJECTIVE: In the setting of acute pulmonary artery hypertension, techniques to reduce right ventricular energy requirements may ameliorate cardiac failure and reduce morbidity and mortality. Inhaled nitric oxide, a selective pulmonary vasodilator, may be effective in the treatment of pulmonary artery hypertension, but its effects on cardiopulmonary interactions are poorly understood. METHODS: We therefore developed a model of hypoxic pulmonary vasoconstriction that mimics the clinical syndrome of acute pulmonary hypertension. Inhaled nitric oxide was administered in concentrations of 20, 40, and 80 ppm. RESULTS: During hypoxic pulmonary vasoconstriction, the administration of nitric oxide resulted in a significant improvement in pulmonary vascular mechanics and a reduction in right ventricular afterload. These improvements were a result of selective vasodilation of small pulmonary vessels and more efficient blood flow through the pulmonary vascular bed (improved transpulmonary vascular efficiency). The right ventricular total power output diminished during the inhalation of nitric oxide, indicating a reduction in right ventricular energy requirements. The net result of nitric oxide administration was an increase in right ventricular efficiency. CONCLUSION: These data suggest that nitric oxide may be beneficial to the failing right ventricle by improving pulmonary vascular mechanics and right ventricular efficiency.

Full Text

Duke Authors

Cited Authors

  • Hillman, ND; Cheifetz, IM; Craig, DM; Smith, PK; Ungerleider, RM; Meliones, JN

Published Date

  • June 1997

Published In

Volume / Issue

  • 113 / 6

Start / End Page

  • 1006 - 1013

PubMed ID

  • 9202680

Pubmed Central ID

  • 9202680

International Standard Serial Number (ISSN)

  • 0022-5223

Digital Object Identifier (DOI)

  • 10.1016/S0022-5223(97)70285-X

Language

  • eng

Conference Location

  • United States