Journal
PSYCHOPHARMACOLOGY
Volume 216, Issue 1, Pages 9-16Publisher
SPRINGER
DOI: 10.1007/s00213-011-2188-5
Keywords
Schizophrenia; Antipsychotics; QT prolongation; Electrocardiography
Categories
Funding
- Stanley Medical Research Institute [03T-459, 05T-726]
- United States National Institute of Health [K05-DA0454, P50-DA18827, U01-MH79639]
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Objective The rate-corrected electrocardiographic QT (QTc) interval may significantly increase in patients with schizophrenia taking antipsychotics. The objective of this naturalistic study was to assess the prevalence of prolonged QTc interval in a large population of inpatients with chronic schizophrenia and to explore QTc relationship with demographic variables and prescribed treatments. Materials and methods Electrocardiograms were obtained from age-and sex-matched 456 controls and 1,006 inpatients with schizophrenia (male/female= 689/317) taking antipsychotics. QTc prolongation was defined as a mean value of two standard deviations above the controls. The adjusted relative risk was calculated using logistic regression analysis. Results QTc prolongation was present in 45 (4.5%) of 1,006 patients overall. Fewer men (3.2%, 22 of 689) than women (7.3%, 23 of 317) displayed QTc prolongation (p<0.004). Moreover, QTc intervals were shorter in male (391 +/- 31 ms) than female subjects (400 +/- 37 ms) (p<0.001). Clozapine was found to produce a longer QTc intervals compared to risperidone and typical antipsychotics. Furthermore, multiple regression analysis showed that significant predictors for QTc prolongation were comorbid cardiovascular disease, antipsychotic types, sex, and age (all p<0.01). Conclusion Our present findings suggest that there are sex differences in the prevalence of QTc prolongation and QTc lengthening in schizophrenia. Antipsychotic types are risk factors for QTc prolongation, and risks are substantially higher for clozapine.
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