Pharmacologic therapy of persistent pulmonary hypertension of the newborn

Pharmacology & Therapeutics
B WeinbergerJ D Laskin

Abstract

Persistent pulmonary hypertension of the newborn (PPHN) is a potentially life-threatening condition characterized by a failure of pulmonary vascular resistance to decrease adequately during the transition to extrauterine life. Inhaled nitric oxide, a vasodilator that acts selectively on the pulmonary circulation, has revolutionized the treatment of this condition. However, inhaled nitric oxide has not proven effective in all patients, particularly those with congenital diaphragmatic hernias or meconium aspiration syndrome. Furthermore, large clinical trials of inhaled nitric oxide have failed to demonstrate significant differences in mortality between nitric oxide-treated and control infants with PPHN. Other therapeutic approaches to PPHN have been limited by a relative lack of specificity for the pulmonary circulation, and have received much less attention. Pharmacologic approaches, including pulmonary surfactants, prostacyclin, endothelin antagonists, Ca(2+)-channel blockers, magnesium sulfate, and tolazoline, have exhibited varying degrees of efficacy in lowering pulmonary vascular pressures in humans and/or animals. A number of these agents are also effective when used in combination. For example, phosphodiesterase inhibito...Continue Reading

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