PEDIATRICS Vol. 85 No. 1 January 1990, pp. 30-32
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Decreased Cardiac Output in Infants of Mothers Who Abused Cocaine

Margot van de Bor MD, PhD1, Frans J. Walther MD, PhD1, and Mahmood Ebrahimi MD1

1 From the Division of Neonatology, Department of Pediatrics, University of Southern California School of Medicine, Los Angeles County-University of Southern California Medical Center, Los Angeles

Cocaine increases the level of circulating catecholamines by blocking the catecholamine reuptake receptors. The effect of intrauterine cocaine exposure on cardiac output was studied in 15 full-term newborn infants whose mothers used cocaine during pregnancy. A total of 22 healthy nonexposed full-term infants served as a control group. On the first day of life, cardiac output (183 ± 12 vs 235 ± 13 mL/kg per minute, mean ± SD; P < .05) and stroke volume (1.3 ± 0.1 vs 1.9 ± 0.1 mL/kg, mean ± SD; P < .005) were lower and arterial blood pressure (60 ± 2 vs 41 ± 2 mmHg, mean ± SD; P < .001) higher in the infants exposed to cocaine. On day 2, cardiac output, stroke volume, and mean arterial blood pressure were similar, probably because of the gradual excretion of cocaine and its metabolites by the infant. It was speculated that an increase in plasma norepinephrine levels is responsible for the cardiovascular effects of intrauterine cocaine exposure.

Key Words: cocaine • cardiac output • blood pressure • newborn infant

Submitted on January 10, 1989
Accepted on March 2, 1989




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