Arterial vascularization of the sinoatrial node area in normal human hearts / Vascularização arterial da região do nó sinoatrial em corações humanos normais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The sinoatrial node (NSA) is responsible for the production of the nervous impulses, which determine the cardiac contraction and its blood supply is provided by the sinoatrial node artery - ANSA. In this research we aimed to study the arterial vascularization of the NSA area in normal human hearts, with macroscopic techniques intending to identify the origin of the sinoatrial node artery, its termination, attempting to the presence or not of the so called "arterial perisinusal network". Twenty five (25) hearts, without diseases, obtained from the "Serviço de Verificação de Óbitos da Capital (SVOC) da Universidade de São Paulo" were canulated by the coronary ostium following injected with colored resin. They were fixed in 10% watery formaldehyde solution (48 hours) an afterwards the atrial circulation was dissected. The left and right atrial halves demonstrating equivalence of arteries (62 and 63 respectively), which was not observed in the anterior and posterior halves of the heart (77 and 48 arteries respectively). The ANSA was originated from de right coronary artery in fifteen cases (60%): eleven by the right anterior medial atrial artery (AADAM), two by the right anterior intermedial atrial artery (AADAI) and two by the right anterior lateral atrial artery (AADAL). In eight cases (32%) was originated from the left coronary artery: three by the left posterior lateral atrial artery (AASPL), two by the left anterior intermedial atrial artery (AASAI) and three by left anterior medial atrial artery (AASAM). In 8% of the cases, the vascular distribution was peculiar - in one of them, the AASAM and left anterior lateral atrial artery (AASAL) were in continuous, reaching and penetrating the node area. In the second case, the AASAM artery joined to the right posterior lateral atrial artery (AADPL) forming a continuous "U" shape surrounding the base of the VCS. In eight hearts, the arterial distribution showed intense ramification in the perinodal area, which could indicate the occurrence of the "perisinusal arterial network". The diversity of the ANSA´s traject, indicated by the literature, shows the necessarily others studies about it to contribute to the integrity of the NSA in surgical procedures that involves the atrial walls.

ASSUNTO(S)

heart morfologia nó sinoatrial atrial circulation coração circulação atrial morphology artéria nodal nodal artery ninoatrial node

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