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The response of circulating catecholamines to asphyxia in unanesthetized, spontaneously breathing neonatal piglets was measured before and after treatment with indomethacin. Prior to treatment with indomethacin, baseline levels [geometric mean, pg/ml (95% confidence limits)] of D, E, and N were 162 (99-266), 174 (52-579), and 380 (286-506), respectively. Inhalation of 10% O2/9% CO2 for 20 min caused significant increases in arterial levels of all three catecholamines to 389 (230-659, 1514 (993-2306), and 3802 (2731-5293), respectively. Treatment with indomethacin (5 mg/kg, intravenous) did not significantly alter either baseline levels of the catecholamines or the levels after 20 min of the asphyxiating gas. In time control piglets, baseline levels and the response to asphyxia were similar before and after placebo. These results suggest that the circulating catecholamine response to asphyxia of the neonatal piglet is independent of the prostaglandin system.

Indomethacin Does Not Alter the Circulating Catecholamine Response to Asphyxia in the Neonatal Piglet