Tricyclic antidepressants in red cells and plasma: Correlation with impaired intraventricular conduction in acute overdose

Yona Amitai, Timothy Erickson, Eugenia J. Kennedy, Jerrold B. Leikin, Daniel O. Hryhorczuk, Jerrold Noble, Paul K. Hanashiro, Henri Frischer

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Objective: Tricyclic antidepressant levels in red blood cells and plasma in acute overdose and their association with cardiotoxicity were studied. Methods: This was a prospective study in 15 patients with acute tricyclic antidepressant overdose. Tricyclic antidepressant parent compounds and metabolites were measured in red blood cells and plasma, and tricyclic antidepressant levels were correlated with ECG indexes of toxicity. Results: Plasma levels of the parent compounds were higher than their red blood cell levels on admission (mean ± SD, 691 ± 409 and 337 ± 220 ng/ml, respectively). Admission metabolite levels were higher in red blood cells than in plasma (264 ± 180 and 190 ± 164 ng/ml, respectively). QRS duration and the red blood cell levels of the metabolites were significantly correlated at the time of admission (r = 0.77, p < 0.01), as well as at 6 to 10 hours (r = 0.74, p < 0.01). Conclusions: In acute overdose, a shift of tricyclic antidepressants from plasma to red blood cells and increased levels of red blood cell metabolites reflect tissue redistribution of the drug. Tricyclic antidepressant red blood cell metabolites are the best markers for impaired intraventricular conduction.

Original languageEnglish
Pages (from-to)219-227
Number of pages9
JournalClinical Pharmacology and Therapeutics
Volume54
Issue number2
StatePublished - Aug 1993
Externally publishedYes

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