TDM grand rounds: neonatal nicotine withdrawal syndrome in an infant prenatally and postnatally exposed to heavy cigarette smoke.

A heavy smoking, lactating mother delivered a baby that exhibited spontaneous tremors, fluctuations of muscular rigidity, and opisthotonus at 48 hours of life. Although the symptoms did not disappear within the following days, they could be controlled by swaddling or wrapping the baby in a blanket. The absence of any other etiology generated a suspicion of prenatal exposure to heavy tobacco smoke and potential neonatal nicotine withdrawal syndrome. This diagnosis was supported by extremely high concentration of hair nicotine and cotinine in the infant's hair and in different segments of maternal hair. The presence of non-negligible amounts of nicotine and cotinine in breast milk confirmed that the mother did not quit smoking after delivery, despite her reports. The breast-fed newborn continued to have 3 to 4 crises of spontaneous tremors and alternant muscular rigidity per day for a month. More studies are needed to establish neonatal nicotine withdrawal.

Buprenorphine withdrawal syndrome in a newborn.

A pregnant woman who was addicted to heroin rapidly withdrew from illicit drugs after the onset of a 4 mg/day buprenorphine treatment. In the newborn's blood, urine, and meconium 20 hours after birth, high concentrations of buprenorphine and its metabolite norbuprenorphine were detected, with a higher buprenorphine/norbuprenorphine ratio than in adults, possibly as a consequence of immature hepatic function; no illicit drugs were found. The child had a weak withdrawal syndrome on the second day of life and recovered rapidly. The measured buprenorphine daily dose ingested by the newborn through mother's milk was very low (3.28 micrograms) and probably had little pharmacologic effect because no withdrawal signs could be noted when maternal feeding was later abruptly interrupted. Further investigations are required to determine whether buprenorphine can be considered to be a good alternative to methadone in the treatment of pregnant heroin addicts to prevent marked withdrawal syndromes in newborns.