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* From the Department of Medicine/Endocrinology, Yale University School of Medicine (Drs. Nakchbandi and Inzucchi), New Haven, CT, and the Maine Medical Center (Dr. Wirth), Portland, ME.
Correspondence to: Inaam A Nakchbandi, MD, Yale University School of Medicine, Department of Medicine/Endocrinology, PO Box 208020, New Haven, CT 06520-8020; e-mail: Endocrine.Fellows{at}Yale.edu
We describe a case of pulmonary hypertension, initially thought to be idiopathic, which resolved after treatment of Graves hyperthyroidism. Results of pulmonary artery catheterization before and after treatment are reported, and the effects of thyrotoxicosis on hemodynamics and pulmonary function are briefly reviewed. Possible mechanisms for development of pulmonary hypertension caused by hyperthyroidism include pulmonary vascular endothelial dysfunction or damage because of autoimmunity or the high cardiac output state, or increased metabolism of intrinsic pulmonary vasodilators.
Key Words: hyperthyroidism pulmonary hypertension thyroid disease
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