OBJECTIVE MEASUREMENTS OF NICOTINE EXPOSURE IN VICTIMS OF SUDDEN-INFANT-DEATH-SYNDROME AND IN OTHER UNEXPECTED CHILD DEATHS

Objective: Self-reported maternal smoking is associated with a dose-re lated increase in the risk of sudden infant death syndrome (SIDS). The aim of this study was to measure objectively whether victims of SIDS are more exposed to tobacco smoke before death than infants who die un expectedly of other causes. Design: Cotinine levels in pericardial flu id were used as an indicator of exposure. Levels > 5 ng/mL indicated s ignificant exposure, and levels > 20 ng/mL indicated heavy exposure. S amples were obtained from all sudden deaths in children < 7 years of a ge that occurred from 1990 through 1993 in southeastern Norway. Twenty -four infants died of SIDS, 12 infants of infections, and 9 of acciden ts (median age 4.5, 5, and 35 months, respectively). Results: Compared with the age-matched infectious deaths, a significantly higher propor tion of victims of SIDS had been significantly (92% vs 67%) or heavily exposed (25% vs 0%) to nicotine, (P < .05). Median cotinine levels in infants with SIDS, 15.8 ng/mL, were significantly higher than in infa nts who had infectious deaths 7.1 ng/mL (P < .003) but were comparable to those of accident victims (12.9 ng/mL, not significant). Conclusio ns: Victims of SIDS are more often and more heavily exposed to tobacco smoke doses before death than are infants who have sudden infectious deaths. Accidental death in infancy and childhood is often associated with a significant exposure to nicotine.