Acute Pericarditis Triggered by Severe Thyrotoxicosis.

Acute pericarditis is a common inflammatory disorder with several causes including infection, malignancy, acute myocardial infarction, and autoimmune disease. Acute pericarditis can rarely present in the setting of thyrotoxicosis. A 65-year-old man with a past medical history of HIV, diastolic dysfunction, and prediabetes presented with positional chest pain, respiratory distress, and altered mentation. He was found down on the ground in a lethargic state and was last seen normally five days before the presentation. On presentation, he was tachycardic and tachypneic, requiring supplemental oxygenation with a nonrebreather mask to maintain adequate oxygen saturation. Initial electrocardiogram (EKG) demonstrated diffuse ST-elevations with early repolarization, consistent with acute pericarditis. Laboratory diagnostics revealed elevated lactic acid, leukocytosis, acute kidney injury, undetectable thyroid stimulating hormone, and elevations in T3, T4, C-reactive protein, brain natriuretic peptide, and creatinine kinase. Given the patient's complex presentation involving thyrotoxicosis and pericarditis, a multidisciplinary team discussion was pursued involving critical care, cardiology, and endocrinology. He was started on intravenous methylprednisolone (subsequently transitioned to prednisone), methimazole, and metoprolol. Colchicine was subsequently added for the management of pericarditis and prednisone was continued (given concomitant thyroid disease) with a plan for tapering them off, per cardiology and endocrinology recommendations. A transthoracic echocardiogram revealed a small pericardial effusion. Anticoagulation was not initiated given the potential risk of developing a hemorrhagic pericardial effusion. Thyroid ultrasound was nonsuggestive of Graves' disease. Thyrotoxicosis may present with a constellation of symptoms, including acute pericarditis. Timely recognition with EKG and echocardiography can aid in prompt management.