This report concerns a patient with hyperthyroidism with established auricular fibrillation before operation, in whom sinus rhythm was restored following the postoperative administration of quinidine. Nineteen months after her thyroidectomy she was operated on for carcinoma of the colon. This operation was performed in three stages. Immediately after two of these operations transient auricular fibrillation developed, which subsided spontaneously after about twelve hours on each occasion. Since that time a year and a half has elapsed and the rhythm has remained regular.
A woman, aged 50, seen June 14, 1932, had had the menopause three years previously. She had been well until about a year previously, when she began to complain of increasing weakness and nervousness. She became excited very readily and noted palpitation and dyspnea on exertion. Two weeks previously during a meal, she suddenly was unable to move her right hand and her speech was