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Intratracheal administration of sildenafil and surfactant alleviates the pulmonary hypertension in newborn piglets.

Obaid L, Johnson ST, Bigam DL, Cheung PY

Department of Pediatrics, University of Alberta, Edmonton, AB, Canada.

OBJECTIVE: To study systemic and pulmonary effects of low-dose sildenafil with surfactant in newborn piglets with pulmonary hypertension (PHT) induced by thromboxane A(2) analog (U46619). DESIGN/METHODS: Piglets (1-3 days, 1.7-2.5kg) were mechanically ventilated and prepared for the continuous measurement of mean systemic and pulmonary arterial pressures (MAP and PAP, respectively), heart rate and pulmonary artery flow (as cardiac output). Following stabilization, PHT was induced by intravenous U46619 infusion (0.2-0.8mug/kg/min) for 120min. Piglets were randomized for intratracheal administration of surfactant (BLES, 4ml/kg) with saline (n=6) or sildenafil (0.05mg/kg, n=6) given after 60min of U46619 treatment. Temporal changes of hemodynamic measurements were analyzed by two-way ANOVA. RESULTS: There was progressive PHT induced by U46619 (161% of baseline), with increased PAP and pulmonary vascular resistance and decreased cardiac output. Surfactant and sildenafil combined improved PAP along with reduced pulmonary vascular resistance. Cardiac output was higher with surfactant and sildenafil combined than surfactant alone. No significant changes in heart rate, stroke volume, MAP and systemic vascular resistance were observed. Ratio of PAP:MAP was lowered with surfactant and sildenafil combined. Systemic oxygen consumption was not different between groups but the oxygen extraction ratio was higher than baseline in surfactant alone (P<0.05). CONCLUSIONS: Adding low-dose sildenafil to surfactant is effective in alleviating the progressive PHT developed in newborn piglets induced by thromboxane A(2). Intratracheal sildenafil may be a useful therapeutic adjunct to critically ill neonates with PHT.

Published 2 May 2006 in Resuscitation, 69(2): 287-94.
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