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Heart 1998;79:169-174; doi:10.1136/hrt.79.2.169
Copyright © 1998 BMJ Publishing Group Ltd & British Cardiovascular Society

Heart 1998;79:169-174 ( February )

Nitric oxide, oxygen, and prostacyclin in children with pulmonary hypertension

M I Turanlahti,a P O Laitinen,a S J Sarna,b E Pesonenc

a Department of Paediatric Cardiology, Division of Paediatrics, The Hospital for Children and Adolescents, Helsinki University Central Hospital, Helsinki, Finland, b Department of Public Health, University of Helsinki, Helsinki, Finland, c Department of Paediatrics, Lund University Hospital, Lund, Sweden

Correspondence to: Dr Turanlahti, Department of Paediatric Cardiology, Division of Paediatrics, The Hospital for Children and Adolescents, University of Helsinki, Stenbäckinkatu 29, FIN---00290 Helsinki, Finland.

Accepted for publication 7 October 1997

Objective---To test the vasodilatory response of the pulmonary vascular bed in children with pulmonary hypertension.
Design---Prospective dose response study in which the effects of inhaled nitric oxide (NO) are compared with those of oxygen and intravenous prostacyclin.
Patients and interventions---The vasodilator test was performed in 20 patients in whom mean pulmonary artery pressure (PAPm) was >=  40 mm Hg and/or pulmonary vascular resistance index was >=  4 Um2. Haemodynamic effects of inhaled NO (20, 40, and 80 ppm) at a fractional inspired oxygen (FiO2) value of 0.3, pure oxygen, oxygen at FiO2 0.9-1.0 combined with NO as above or with intravenous prostacyclin at 10 and 20 ng/kg/min were measured.
Result---NO decreased PAPm with a dose response from 20 to 40 ppm (mean change at 40 ppm -5.50, 95% confidence interval (CI) -7.98 to -3.02 mm Hg). Maximal decrease in the ratio of pulmonary to systemic vascular resistance was achieved with a combination of NO 80 ppm and oxygen (-0.18, 95% CI -0.26 to -0.10). Increase in the pulmonary flow index was greatest with pure oxygen in those with an intracardiac shunt (8.52, 95% CI -0.15 to 17.20 l/min/m2). Neither NO nor oxygen altered systemic arterial pressure but intravenous prostacyclin lowered systemic arterial pressure and resistance.
Conclusions---NO selectively reduces pulmonary vascular resistance and pressure maximally at 40 ppm. Oxygen reduces pulmonary vascular resistance and NO potentiates this reduction without affecting the systemic circulation. Prostacyclin vasodilates the pulmonary and the systemic circulations.

Keywords: pulmonary hypertension;  nitric oxide;  prostacyclin;  congenital heart disease;  children

© 1998 by Heart
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