Abstract
A 56-year-old man was admitted to our hospital with electrolyte abnormalities identified during an examination for
leg cramps at a clinic. On arrival, his vital signs were as follows: Glasgow Coma Scale (GCS), E4V5M6; body temperature,
37.8°C; blood pressure, 128/78 mmHg; pulse rate, 87/min; respiratory rate, 16/min; and SpO2, 95% on
room air. His medical history included alcoholic liver cirrhosis and alcohol use disorder. Laboratory examinations revealed
hypokalemia (1.8 mEq/L), hypomagnesemia (1.1 mg/dL), hypophosphatemia (2.1 mg/dL), hypocalcemia (6.0
mEq/L) and an electrocardiogram (ECG) showed a prolonged QT interval (QTc, 559 ms) due to electrolyte abnormalities.
The patient was admitted to our hospital and electrolyte abnormalities were corrected through the use of intravenous
infusion therapy administered by our medical team. Laboratory examination on day 4 showed improved
electrolyte abnormalities, and an ECG on day 4 showed a normal QT interval (QTc, 437 ms). Clinicians should be
aware that alcoholic myopathy and long QT syndrome may develop in individuals with alcohol use disorder.
