Suspected Clozapine-Induced Cardiomyopathy and Heart Failure With Reduced Ejection Fraction
An increased awareness of the adverse effects associated with clozapine can help physicians quickly diagnose this rare and potentially fatal condition.
Dr. Patuszynski is a clinical pharmacy specialist in cardiology at the VA Loma Linda Healthcare System. Dr. Applegate is a staff cardiologist at the VA Northern California Healthcare System and an associate professor of medicine/cardiology at the University of California, Davis School of Medicine.
Author disclosures The authors report no actual or potential conflicts of interest with regard to this article.
Disclaimer The opinions expressed herein are those of the authors and do not necessarily reflect those of Federal Practitioner, Frontline Medical Communications Inc., the U.S. Government, or any of its agencies. This article may discuss unlabeled or investigational use of certain drugs. Please review the complete prescribing information for specific drugs or drug combinations—including indications, contraindications, warnings, and adverse effects—before administering pharmacologic therapy to patients.
Conclusion
Better awareness and regular screening for signs and symptoms of HF may help prevent a delay in diagnosing a rare but serious and potentially fatal condition associated with clozapine. Chest X-rays demonstrating cardiomegaly can be helpful when the early diagnosis of HF is suspected and may be the first diagnostic imaging test to normalize after clozapine discontinuation.
Since clozapine is a REMS medication and all patients are scheduled for regular ANC follow-up, it would seem prudent that patients also should be screened for signs and symptoms of HF, including the new onset or worsening of baseline shortness of breath, palpitations, cough, fatigue, chest pain, edema, gastroparesis, and perhaps extreme weight loss. Once a physician suspects HF, an ECHO should be obtained immediately.
In addition to the clozapine boxed warning for cardiomyopathy, it would be helpful if the clozapine patient counseling information section had a specific warning that advises patients to contact their clinician if they develop the signs and symptoms of HF.
