Background: The triage of unintentional tricyclic and cyclic antidepressant ingestions involving children <6 years seems based on single cases or small studies. Walsh, in describing 2 cases involving 15-20 mg/kg ingestions, recommended hospitalizing all children ingesting tricyclic and cyclic antidepressants.
Objective: To evaluate the patterns of triage for pediatric tricyclic and cyclic antidepressants practiced by regional poison control centers nationwide, and to determine the amount ingested (mg/kg) that resulted in referral to the emergency department, including the recommended duration of observation time for asymptomatic children. Second, to analyze the cost implications, as well as the need for a practice guideline based on severity stratification.
Methods: We sent a survey to 44 major regional poison control centers. We reviewed Health Care Financing Administration's tricyclic and cyclic antidepressants management related costs.
Results: Thirty centers responded (68%). Eighty-seven percent of all centers send children, regardless of dose ingested, to the emergency department. Four out of the 30 recommended observation based on dose in mg/ kg ingested (range >1.5-5). Recommended observation times in the emergency department varied between 6-24 hours. Twenty-seven (90%) Poison Control Centers recommended 6 hours (although one recommended doing so only after administering activated charcoal). One recommended 6-12 hours of observation and 2 Poison Control Centers recommended 24-hour observation. Only 1 center recommended obtaining tricyclic and cyclic antidepressant plasma levels.
Discussion: In our review of the literature, the lowest toxic dose reported was 6.7 mg/kg. This is consistent with our Poison Control Center data over the past 5 years where no child was toxic at doses <5 mg/kg. While only 13% of the centers surveyed utilize a stratification strategy to triage pediatric tricyclic and cyclic antidepressant ingestions, the current referral patterns support evaluation based on pharmacokinetics, not worst case incidents.
Conclusion: This survey demonstrates that most children with tricyclic and cyclic antidepressant ingestions will be sent to the emergency department, regardless of the amount ingested. A prospective study is needed to determine the probable dose of tricyclic and cyclic antidepressant ingestions that requires observation at a health care facility.