Key result
Clozapine carries a ~4% myocarditis incidence, with concomitant SSRIs linked to increased risk.
Why the study?
The incidence and risk factors for clozapine-induced myocarditis and cardiomyopathy were not well defined in patients treated at a regional mental health service.
What is the incidence and what are the risk factors for clozapine-induced myocarditis and cardiomyopathy in patients initiated on clozapine?
Cohort (n=129)
No
What is the incidence and what are the risk factors for clozapine-induced myocarditis and cardiomyopathy in patients initiated on clozapine?
Clozapine is associated with a high incidence of myocarditis and cardiomyopathy, and concomitant SSRI use may be a risk factor for myocarditis, reinforcing the need for standardized monitoring.
Answers are grounded in this paper and cite their sources.
Alerts clinicians to clozapine myocarditis risk with SSRI co-use; leaves open causality and optimal monitoring protocols.
OBJECTIVE: To determine the incidence of clozapine-induced myocarditis and cardiomyopathy and identify risk factors. METHOD: A cohort of 129 patients initiated on clozapine at Toowoomba Mental Health Service from year 2000 until 2011 was examined to evaluate cases of myocarditis and cardiomyopathy. Risk factors were analysed using multivariable logistic regression. RESULTS: The incidence of clozapine-induced myocarditis and cardiomyopathy was 3.88% and 4.65% (or 2.26 per 100 patient years), respectively. A significant association was identified between clozapine-induced myocarditis and SSRI use (p = 0.043). Subclinical cardiomyopathy was identified in the absence of symptoms in the majority of cases. CONCLUSIONS: These results illustrate a high incidence of clozapine-induced myocarditis as well as cardiomyopathy, reinforcing the need for a standardised, mandatory monitoring scheme. Concomitant SSRI use as one such potential predictor merits further study.
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Youssef et al. (2015) conducted a cohort in Patients requiring clozapine (n=129). Clozapine was evaluated on Incidence of clozapine-induced myocarditis and cardiomyopathy and associated risk factors (p=0.043). Clozapine use was associated with a 3.88% incidence of myocarditis and 4.65% incidence of cardiomyopathy, with concomitant SSRI use identified as a significant risk factor for myocarditis.
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