The subject of heart-block has held a prominent position in recent medical literature. Certain features of the following cases of auricularventricular block appeal to me as deserving of record and discussion. They are taken from the records of the University Hospital and presented in this form on the recommendation of Dr. A. W. Hewlett, to whom I am indebted for many valuable suggestions.
—B. E. M., 28, student, was admitted May 20, 1909, complaining of dizziness and dyspnea on exertion. His family history and habits were good. Two years previously he suffered from a very severe tonsillitis followed by acute rheumatism. During the second week of his illness the heart-rate increased out of proportion to his illness, rising to 170 on sitting up. There was no pain but excessive nervousness and a small goiter developed. He improved on thyroidectin after seven months in bed,