Abstract
Patterns of arterial supply to the atria were studied with respect to the coronary sinus region in 60 human hearts obtained from patients with a negative cardiac history and in 2 hearts with ECG-demonstrated coronary sinus rhythm. The atria, including the interatrial septum, were supplied by the right (40%) or left (30%) or both (30%) sinuatrial arteries which, however, did not reach as far as the posterior margin of the oval fossa and the coronary sinus. The region of the coronary sinus with the Eustachian ridge received direct branches from the trunk of the right (41%) or left (11%) coronary artery or both (48%) in the adjacent part of the coronary sulcus. Possible development of the 'coronary sinus rhythm' on the basis of multifocal damage of the sinuatrial arteries is discussed.
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