Does Perinatal Phenobarbital Exposure Affect Developmental Outcome at Age 2?

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Abstract
The Objective of this paper is to determine if phenobarbital exposure during pregnancy affects developmental outcome at age 2 years. Between 1991 and 1994, 401 pregnant patients at risk for delivery prior to 34 weeks' gestation were invited to participat; 48 mothers declined entry. Before delivery, pharmacy randomized the pregnant women to receive phenobarbital and vitamin K or identically appearing placebo in a blinded fashion. Developmental follow-up at age 2 years was performed. Children from the treatment group scored signifcantly lower on the Bayler Mental Developmental Index (mean MDI ± 1 SD) than children whose mothers were randomized to the placebo group [104 ± 21 (n = 59) vs. 113 ± 22 (n = 62), p = 0.023]. Of 36 independent variables, randomization group was one of five that individually contributed to the prediction of the Bayley MDI score (p < 0.05). It was concluded that perinatal phenobarbital therapy may impair developmental outcome.

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