Fig. 1

Electrocardiogram obtained at the patient’s first visit to the emergency room. The ST depression observed at admission (A) persisted after coronary angiography (B), but partially improved after brain surgery (hospital day 3), wherein T-wave inversion and tachycardia were observed (C). After 4 days (hospital day 7), the T-wave inversion normalized but the tachycardia persisted (D). Prior to starting an alpha-blocker for pheochromocytoma (hospital day 11), ST depression showed improvement with a sinus rhythm (hospital day 22) (E). After that, a normal sinus rhythm was maintained, and electrocardiography was not performed daily