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TCA poisoning treated in the intensive care unit
1Department of Anesthesia and Intensive Care, Sahlgren's Hospital, Gothenburg, Sweden.
Pharmacopsychiatry
|January 1, 1990
Summary
Tricyclic antidepressant (TCA) overdose is dangerous, but newer drugs like lofepramine are safer. Maprotiline, however, shares the same cardiotoxicity and prolonged ICU stay risks as TCAs.
Area of Science:
- Pharmacology
- Toxicology
- Emergency Medicine
Background:
- Tricyclic antidepressants (TCAs) are a frequent cause of intensive care unit admissions and overdose deaths.
- Predicting severe toxicity from TCA overdose is challenging, as plasma concentrations poorly correlate with adverse events.
- Level of consciousness on hospital admission is a better predictor of complications than plasma TCA levels.
Purpose of the Study:
- To evaluate the toxicity of newer antidepressant agents compared to classic TCAs in overdose scenarios.
- To assess the specific risks associated with maprotiline and lofepramine, two "newer" antidepressants marketed in Sweden.
Main Methods:
- Comparative analysis of toxicity profiles of TCAs, maprotiline, and lofepramine based on overdose data.
- Review of clinical outcomes including cardiotoxicity, convulsions, and intensive care unit (ICU) stay duration.
Main Results:
- Lofepramine demonstrates lower toxicity compared to classic TCAs.
- Maprotiline exhibits similar cardiotoxicity to TCAs, with a higher incidence of convulsions.
- Maprotiline overdose is associated with a longer plasma half-life, leading to prolonged mechanical ventilation and ICU admission.
Conclusions:
- Not all "newer" antidepressants are less toxic than TCAs; lofepramine is an exception.
- Maprotiline presents significant risks in overdose, comparable to or exceeding those of TCAs.
- Clinical assessment of consciousness level is crucial for managing TCA and related antidepressant overdoses.