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When it is possible to publish a book of 429 pages devoted to the single symptoms of alternation, the study of the arhythmias of the heart may be said to have reached a point of great intensity. In undertaking his task Gravier has brought together all that is known of fact and of theory on the subject. He recalls that it was Traube, so many of whose suggestions regarding the clinical pathology of the heart have borne valuable fruit, who in 1872 first devised the term and described the condition. The present insight into the subject of alternation, however, dates really from about 1900, when the studies of Mackenzie and Wenckebach began to enrich this field. The definition of the rhythm which Gravier adopts and from which there can be no substantial difference of opinion is that it represents a variation (an alternation) in the force of succeeding contractions without
L'Alternance du Coeur : Etude Critique et Clinique.. Arch Intern Med (Chic). 1915;XV(2):339–340. doi:10.1001/archinte.1915.00070200161011