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Clozapine associated dilated cardiomyopathy.

M A Tanner¹, W Culling

¹Cardiology Department, Kingston Hospital NHS Trust. marktanner@lycos.co.uk

Postgraduate Medical Journal

|August 5, 2003

Summary

Clozapine, an antipsychotic, can rarely cause serious heart problems like dilated cardiomyopathy, even years after starting treatment. Persistent sinus tachycardia may be the only early sign, necessitating vigilant cardiac monitoring in patients on clozapine.

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Area of Science:

Cardiology
Psychiatry
Pharmacology

Background:

Clozapine is an essential atypical antipsychotic medication used for treatment-resistant schizophrenia.
While effective, clozapine carries known risks, including agranulocytosis and metabolic syndrome.
Cardiac complications, though rare, are a serious concern associated with clozapine therapy.

Observation:

A 31-year-old male patient on long-term clozapine therapy (6 years) presented with persistent sinus tachycardia.
Electrocardiogram revealed sinus tachycardia, left ventricular hypertrophy, and a prolonged QTc interval.
Echocardiography indicated the presence of dilated cardiomyopathy.

Findings:

The patient's presentation suggests a potential association between long-term clozapine use and the development of dilated cardiomyopathy.
Sinus tachycardia, often overlooked, can be a critical early indicator of clozapine-induced cardiac toxicity.
Cardiac adverse events from clozapine can manifest insidiously, potentially years after treatment initiation.

Implications:

Clinicians must maintain a high index of suspicion for cardiac complications in all patients receiving clozapine, regardless of treatment duration.
Routine cardiac monitoring, including ECG and echocardiography, should be considered for patients on long-term clozapine.
Informing patients about potential cardiac symptoms and ensuring prompt medical evaluation are crucial for early detection and management of clozapine-related cardiotoxicity.

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