FRI512 Thyrotoxic Periodic Paralysis With Extreme Hypokalemia Precipitated By Acute Alcohol Intoxication In A Patient With Graves’ Disease

Disclosure: J. Batra: None. A.R. Ankireddypalli: None. J. Kaur: None. Introduction: Thyrotoxic periodic paralysis (TPP) is a muscle and electrolyte disorder, mostly seen in the setting of hyperthyroidism. It is characterized by reversible painless muscle weakness and hypokalemia. Prevalence is highest in East Asian populations, approximately 2%, and 0.1-0.2% in other populations. Males are much more likely to be affected. Common provoking factors include exercise, fasting, and changes in diet. Clinical case: A 29-year-old male of East Asian ethnicity presented to the hospital with the complaint of multiple bouts of inability to lift his extremities for 1 day. He also complained of generalized weakness. He did not have any changes in his mental status and was fully oriented at the time of the presentation. No breathing difficulty was reported. He had been drinking the night before with his friends and drank 1 L of vodka. His past medical history was significant for hyperthyroidism secondary to Graves’ disease, which was diagnosed a year ago. He had been prescribed methimazole but had not been adherent to the medication. The basic metabolic panel revealed undetectable serum potassium of <1.5 (3.4 to 5.3 mmol/L). The rest of the electrolytes and renal function were unremarkable. TSH was suppressed at <0.01 (0.3 to 4.20 uIU/L) and free T4 levels were significantly elevated at 7.77 (0.9 to 1.70 ng/dL). The thyrotropin receptor antibody was 33 (0.00 to 1.75 IU/L). EKG showed sinus tachycardia with nonspecific T-wave abnormalities. Thyroid ultrasound showed diffusely heterogenous parenchyma with diffusely increased blood flow throughout the thyroid on doppler. Echocardiogram showed a normal ejection fraction of 55-60% with mild concentric left ventricular wall thickening consistent with left ventricular hypertrophy. He was initially treated with intravenous potassium replacement and high doses of propylthiouracil, hydrocortisone, and propranolol, leading to the resolution of his symptoms. He was discharged on methimazole and propranolol therapies. Learning points: • Patients with Graves’ disease are routinely counseled against tobacco use to avoid worsening of orbitopathy. Hyperthyroid patients should also be counseled regarding avoidance or moderation of alcohol intake to avoid this rare but potentially life-threatening complication of thyrotoxic periodic paralysis. • The incidence of TPP is significantly higher in the East Asian populations, especially among males (8.7-13%). Counseling regarding provoking factors, the importance of adherence to medications, and the maintenance of euthyroidism to avoid TPP is essential. Presentation: Friday, June 16, 2023