Abstract
To the Editor.— Transient bundle branch block may be precipitated by many factors, such as, tachycardia, myocardial infarction, pulmonary embolism, anemia, anoxemia, and metabolic disturbances. 1,2 If transient bundle-branch block is due to tachycardia, slowing of the heart rate may restore normal intraventricular conduction. The following case is unusual in that left bundle-branch block was abolished by left carotid sinus massage although paroxysmal atrial tachycardia persisted. Report of a Case.— A 47-year-old man was brought to the University of Maryland Hospital emergency room on Sep 19, 1969, due to the sudden onset of severe palpitations of two hours' duration. The palpitations were associated with dyspnea and retrosternal pressure sensation. A similar attack had occurred several months before and had terminated spontaneously. He had been an alcoholic for many years. There was no history of rheumatic fever, hypertension, or heart disease. Physical examination revealed an anxious man who appeared acutely ill
Published Version
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