All of the following conditions produce restrictive cardiomyopathy except
Correct Answer: Hypothyroidism
Description: Ref:Harrison's 19th E pg 1563 Hypehyroidism and hypothyroidism do not often cause clinical hea failure in an otherwise normal hea, but commonly exacerbate hea failure. Clinical signs of thyroid disease may be masked, so tests of thyroid function are pa of the routine evaluation of cardiomyopathy. Hypehyroidism should always be considered with new-onset atrial fibrillation or ventricular tachycardia or atrial fibrillation in which the rapid ventricular response is difficult to control. The most common current reason for thyroid abnormalities in the cardiac population is the treatment of tachyarrhythmias with amiodarone, a drug with substantial iodine content. Hypothyroidism should be treated with very slow escalation of thyroid supplements to avoid exacerbating tachyarrhythmias and hea failure. Hypehyroidism and hea failure are a dangerous combination that merits very close supervision, often hospitalization, during titration of antithyroid medications, during which decompensation of hea failure may occur precipitously and fatally.
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