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A Doxorubicin-Induced Murine Model of Dilated Cardiomyopathy In Vivo

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Reversible dilated cardiomyopathy due to subclinical hyperthyroidism.

Kostantinos Tsarouhas¹, Ioannis Kafantaris, Athanasios Antonakopoulos

¹2nd Department of Cardiology, Amalia Fleming General Hospital, Athens, Greece.

Hellenic Journal of Cardiology : HJC = Hellenike Kardiologike Epitheorese

|February 2, 2010

Summary

Subclinical hyperthyroidism can cause dilated cardiomyopathy and heart failure, even without prior heart issues. Prompt treatment reversed these cardiac symptoms in an exceptional case study.

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Area of Science:

Cardiology
Endocrinology

Background:

Subclinical hyperthyroidism is often asymptomatic or mildly symptomatic.
Overt heart failure is uncommon in hyperthyroid patients, especially those without pre-existing cardiac conditions.

Observation:

A patient without primary heart disease presented with dilated cardiomyopathy.
Cardiac function was assessed using echocardiography, coronary angiography, and radionuclide ventriculography.
The patient exhibited symptoms consistent with heart failure, including left ventricular dilatation and reduced ejection fraction.

Findings:

The patient's dilated cardiomyopathy and heart failure manifestations were linked to subclinical hyperthyroidism.
Conventional treatment, including furosemide, carvedilol, angiotensin-converting-enzyme inhibitor, and thiamazole, was administered.
Significant reversal of cardiac dysfunction was observed 6 months post-treatment.

Implications:

This case highlights a rare presentation of subclinical hyperthyroidism leading to significant cardiac impairment.
It underscores the importance of considering thyroid dysfunction in unexplained heart failure.
Early diagnosis and treatment of hyperthyroidism may prevent or reverse cardiac complications.