THE EFFECT OF CARDIAC RATE AND THE INHALATION OF OXYGEN ON TRANSIENT BUNDLE BRANCH BLOCK

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Abstract
While temporary or recurring abnormalities of supraventricular conduction are common, notably during the administration of digitalis or during the course of rheumatic fever, disturbances of intraventricular conduction are more often permanent. Deranged right or left bundle conduction in clinical cases has been recognized since the experimental demonstration by Eppinger and Rothberger1 of the form of galvanometric curves obtained by sectioning the bundle in dogs. A number of anatomic studies has resulted in the demonstration of lesions affecting one or the other bundle in hearts from which, during life, curves had been recorded characteristic of bundle branch block. Evidence of this type of inefficiency of the conducting system is usually observed to persist, but to this generalization there are conspicuous exceptions. Lewis,2 Mathewson,3 Carter3a and Robinson4 each published records showing transient bundle branch block as a temporary phenomenon. It is the purpose of this communication to record further observations on temporary