Unexpected outcome (positive or negative) including adverse drug reactions
Antipsychotic-drug-induced dilated cardiomyopathy
1 Department of Medicine, Hemel Hempstead Hospital, Hemel Hempstead HP2 4AD, UK
2 Department of Cardiology, Hemel Hempstead Hospital, Hemel Hempstead HP2 4AD, UK
Correspondence to:
Anil K Taneja, aniltaneja00{at}hotmail.com
A man in his 30s presented with symptoms of shortness of breath (SOB). He was on clozapine for schizophrenic symptoms. From the initial two presentations it was thought to be and managed as a chest infection, and a perfusion ventilation scan was done to rule out pulmonary embolism. However, with worsening SOB on exertion, he presented for a third time, and was referred and seen in the Department of Medicine on this occasion. The ECG showed evidence of left atrial and ventricular enlargement. The chest x ray showed an increased cardiothoracic ratio. An urgent echocardiogram showed the presence of dilated cardiomyopathy with severe left ventricular systolic function impairment. The patient had a coronary angiogram and other relevant investigations to look for the cause of the dilated cardiomyopathy. These investigations did not reveal any significant abnormality. The cause appeared to be related to the drug clozapine. The patient was treated for heart failure, and clozapine was stopped. He improved and repeat echocardiogram at follow-up showed a definite improvement in the symptoms and the echocardiogram.
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