Abstract
The ductus arteriosus is a vascular channel which, although vital to the fetal circulation, rapidly becomes unnecessary and even deleterious after birth. As such, it is ‘preprogrammed’ to constrict within the first few hours of life. In infants born prematurely this natural closure is often delayed and/or ineffective. In this review, we summarise the current knowledge of the delicately orchestrated control of normal ductal closure, with emphasis on the role of various biochemical mediators.
The major focus of this review, however, is on pharmacological approaches designed to prevent and/or treat the persistently patent ductus arteriosus (PDA) which often fails to constrict spontaneously in the premature infant. The standard treatment regimen is based on the administration of 3 doses of the nonselective cyclo-oxygenase inhibitor, indomethacin. We begin by examining, from the vantage point of the ductus, the use of this indomethacin as a tocolytic. It seems that antenatal administration of indomethacin can cause transient, reversible ductus constriction which renders the post-treatment ductus resistant to subsequent closure, both natural and therapeutic. We then review some of the pros and cons associated with the prophylactic administration of indomethacin. Although prophylactic indomethacin is aimed primarily at preventing intraventricular haemorrhages in premature neonates, it does tend to reduce the risk of PDA as well.
We then describe some novel therapeutic approaches to effect ductal closure with indomethacin, including the use of continuous infusions to minimise toxic vasoconstrictive phenomena and the use of prolonged maintenance dose to prevent PDA recurrences.
Finally we discuss some of the newer agents described more recently which play a role in closing the persistently patent ductus over the next decade. Most prominent of these is ibuprofen which some studies have shown to have less undesirable vasoconstrictive adverse effects. Studies which compare the use of ibuprofen to indomethacin are summarised.
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Hammerman, C., Kaplan, M. Comparative Tolerability of Pharmacological Treatments for Patent Ductus Arteriosus. Drug-Safety 24, 537–551 (2001). https://doi.org/10.2165/00002018-200124070-00005
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DOI: https://doi.org/10.2165/00002018-200124070-00005