Rikako Suzuki, Takeshi Hayashi*, Hiroshi Asano*, Kennosuke Ohashi, Masaya Sakamoto, Katsuyoshi Tojo and Kazunori Utsunomiya
Isolated adrenocorticotropic hormone (ACTH) deficiency is a rare disorder, characterized by secondary adrenal insufficiency. We experienced a case of isolated ACTH deficiency presented with prolonged QT intervals which was helpful in diagnosis. Hereby we report our case and review the previous cases. We describe a 77 year-old female whose major complaints were general malaise, anorexia, and depression. On admission, QT intervals of ECG were prolonged. Endocrine tests indicated that she was suffering from isolated ACTH deficiency. After hydrocortisone replacement therapy was started, QT intervals were shortened and all of her complaints were resolved. There are only six reports about isolated ACTH deficiency associated with prolonged QT intervals until now. Prolongation of QT intervals is known to be a risk factor for cardiovascular events such as ventricular fibrillation, but interestingly prolonged QT intervals associated with isolated ACTH deficiency infrequently cause lethal arrhythmia. The initial symptoms of adrenal deficiency in elderly patients are obscure and adrenal deficiency is often misdiagnosed as unidentified clinical syndrome. It is important to consider isolated ACTH deficiency when recognizing unexplained prolonged QT intervals.