Premature labor and indomethacin

Area of Science:

• Obstetrics and Gynecology
• Neonatology
• Pharmacology

Background:

• Premature labor contractions pose risks to maternal and fetal health.
• Non-steroidal anti-inflammatory drugs (NSAIDs) like indomethacin are used to suppress uterine activity.
• Understanding the safety profile of indomethacin during pregnancy is crucial.

Purpose of the Study:

• To evaluate the efficacy of oral indomethacin in managing premature labor contractions.
• To assess the maternal and fetal well-being during and after indomethacin therapy.
• To investigate potential adverse effects in newborns following maternal indomethacin exposure.

Main Methods:

• Administration of oral indomethacin (25 mg every 6 hours for 5 days) to 29 women with premature labor (26th-37th week of gestation).
• Monitoring uterine activity via external tocometry and labor via cardiotocography.
• Assessing maternal and fetal well-being through serial measurements of estriol, human placental lactogen (hPL), alpha-fetoprotein, and urinary estriol/creatinine ratio.
• Pediatric examination of newborn infants, including Apgar scores and assessment for respiratory and circulatory distress.

Main Results:

• Indomethacin significantly decreased uterine activity in 26 out of 29 women.
• No significant adverse effects were observed on maternal or fetal well-being during pregnancy and labor in the majority of cases.
• Four out of 29 newborns (36-40 weeks gestational age) exhibited low one-minute Apgar scores (<7), cyanosis, tachypnea, hypoxemia, and prolonged oxygen dependency.
• All affected infants survived, with abnormalities potentially attributed to indomethacin's inhibition of cyclo-oxygenase and prostaglandin-dependent physiological regulation.

Conclusions:

• Oral indomethacin is effective in suppressing premature labor contractions.
• While generally safe for maternal and fetal well-being, short-term indomethacin exposure may be associated with transient neonatal respiratory and circulatory complications.
• Further research is warranted to fully elucidate the mechanisms behind these neonatal abnormalities and optimize treatment protocols.