Cardiac complications of thyroid hormone resistance syndromes.

Annales d'endocrinologie
Frédéric IllouzPatrice Rodien

Abstract

Thyroid hormones exert their action by binding to their thyroid hormone receptors among other mechanisms. They are involved in different cardiac functions, including contractility and rhythm. The mutation of thyroid hormone receptor β is the main cause of thyroid hormone resistance. The cardiac phenotype of mutated patients has been studied in several cohorts of patients with different mutations. Tachycardia, palpitation and cardiac arrhythmia frequently appear; atrial flutter/fibrillation is found in up to 20%. Cardiac systolic and diastolic functions are impaired compared to hyperthyroid or euthyroid subjects, but cases of heart failure have not been reported. No correlation between genotype and cardiac phenotype has been found. Patients with a mutation of thyroid hormone receptor α frequently present bradycardia and systolic and diastolic functions that are similar to those of hypothyroid subjects. Levothyroxine treatment partly improves these parameters.

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