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ORIGINAL ARTICLE

Predominance of the coronary arteries of the brazilian hearts

Renato Lima JúniorI; Richard Haiti CabralI; Nadir Eunice Valverde B. de PratesII

DOI: 10.1590/S0102-76381993000100002

ABSTRACT

The type of circulation and the predominance of the coronary arteries have a great interest in Cardiology as well as in Cardiac Surgery. There is a close relationship between the type of circulation and the risk of myocardial injuries after coronary obstruction. We carried out 50 normal hearts (35 males and 15 females) of 28 Caucasian and 22 non-caucasian individuals. The arteries were injected with colored gelatine. The average cardiac weight was 291 g and the ventricular length was 97 mm. The right coronary predominance was the most common pattern of distribution (72%) and is followed in incidence by a left coronary predominance (16%) and least frequently by a balanced circulation (12%). The incidence of branches crossing the crux cordis ranged from 1 to 5 (average 2,2) in right coronary predominance. On the other hand, in the left coronary predominance we found one branch in two hearts. The most frequent branch reaching the diaphragmatic from the sternocostal surface was the interventricularis anterioris ramus (50%).

RESUMO

O conhecimento anatômico do tipo de circulação, com a identificação da dominância das artérias coronárias na irrigação do coração, apresenta grande interesse clínico e cirúrgico, devido a que variações nessa irrigação ocasionam diferentes graus de gravidade em casos de obstrução. Foram estudados 50 corações retirados de indivíduos adultos, de ambos os sexos e diferentes raças, nos quais as artérias coronárias foram dissecadas, visando identificar o tipo de circulação. Realizamos, ainda, estudo morfométrico em corações cujo peso médio foi 291 gramas e altura ventricular média de 97 mm. Em 72% dos corações estudados havia dominância da direita, 16% circulação balanceada e 12% dominância da esquerda. Identificamos o número de ramos que ultrapassam a crux cordis, sendo o mínimo de um ramo e o máximo de cinco ramos, com valor médio de 2,2 nos casos de dominância da direita e em apenas dois corações um ramo (em cada um) nos 8 de dominância da esquerda. Em 50% dos corações estudados o ramo interventricular anterior ultrapassa o ápice cardíaco, atingindo a sua face diafragmática.
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REFERENCES

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Article receive on Tuesday, March 30, 1993

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