Adverse cardiac effects associated with clozapine.
OBJECTIVE
To review the published literature on serious adverse cardiac events associated with the atypical antipsychotic agent, clozapine, and to make recommendations for cardiac assessment of candidates for clozapine treatment and for monitoring of cardiac status after treatment is initiated.


METHODS
We searched the PubMed and MEDLINE databases for articles published from 1970 to 2004 that contain the keywords "clozapine and myocarditis," "clozapine and cardiomyopathy," "clozapine and cardiotoxicity," "clozapine and sudden death" or "clozapine and mortality." We also manually searched the bibliographies of these articles for related sources.


METHODS
We reviewed the 30 case reports, case series, laboratory and clinical trials, data mining studies, and previous reviews identified by this search.


RESULTS
Recent evidence suggests that clozapine is associated with a low (0.015% to 0.188%) risk of potentially fatal myocarditis or cardiomyopathy. The drug is not known to be independently associated with pathologic prolongation of the QTc interval, but it may contribute to pathologic QTc prolongation in patients with other risk factors for this condition.


CONCLUSIONS
The low risk of a serious adverse cardiac event should be outweighed by a reduction in suicide risk for most patients taking clozapine. We provide recommendations for assessing and monitoring cardiac status in patients prior to and after initiation of treatment with clozapine.
Merrill
David B
DB
New York State Psychiatric Institute, Department of Psychiatry, Columbia University, New York, NY 10032, USA. david_merrill@post.harvard.edu
Dec
G William
GW
Goff
Donald C
DC
D014150:Antipsychotic Agents / Q000009:adverse effects*; D009202:Cardiomyopathies / Q000139:chemically induced / Q000453:epidemiology; D003024:Clozapine / Q000009:adverse effects*; D016757:Death, Sudden, Cardiac / Q000453:epidemiology; D006331:Heart Diseases / Q000139:chemically induced* / Q000453:epidemiology; D006801:Humans; D009205:Myocarditis / Q000139:chemically induced / Q000453:epidemiology
D014150:Antipsychotic Agents; D003024:Clozapine