Takotsubo Cardiomyopathy after Hypoglycemia in a Patient with Anorexia Nervosa

BACKGROUND Takotsubo cardiomyopathy, also known as "apical ballooning syndrome", is generally precipitated by endogenous or exogenous stress. Eating disorders are associated with a variety of physical complications. CASE PRESENTATION We present a case involving a 37-year-old Japanese female with anorexia nervosa. She was admitted because of emaciation with shortness of breath and tiredness, and her weight was 30.0 kg (BMI 10.5 kg/m2) at this admission. On the afternoon of the first day of hospitalization, a simple measurement caused hypoglycemia (20 mg/dL), and she lost consciousness. On the night of the second day of hospitalization, electrocardiogram showed negative T waves in II, III, aVf, and V1-6. Ultrasound echo showed hypokinesia at the apex of the heart and hypercontraction at the base of the heart. The left ventricular ejection fraction was 20%. Rest and oxygen administration gradually improved her cardiac function; the left ventricular ejection fraction also improved to 50% based on echocardiography. Finally, her weight increased to 43 kg (BMI 15.2 kg/m2) with psychiatric treatment, and she was discharged. CONCLUSIONS The present case shows the clinical features of Takotsubo cardiomyopathy induced by a hypoglycemic event in addition to underlying anorexia nervosa.