title: Anatomical and clinical aspects of the blood supply of the sinoatrial node.
abstract: BACKGROUND
  The recent study of the variations of the origin of the sinoatrial node and on the "arterial network of the perinodal sinusal area" in normal hearts points out the importance of this network.
  
  
  OBJECTIVE
  Report on a case of patient with syncope of ischemic etiology.
  
  
  CONCLUSIONS
  In this patient the arterial network did not protect the node from the ischemia caused by the obstruction of the artery of the sinoatrial node.
authors.affiliation: Department of Medicine, Universidade Federal de São Paulo-Escola Paulista de Medicina, Brazil.
authors.forename: A C
authors.initials: AC
authors.lastname: Lopes
authors.forename: L J
authors.initials: LJ
authors.lastname: DiDio
authors.forename: E
authors.initials: E
authors.lastname: Buffolo
mesh_terms: D003331:Coronary Vessels / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000150:complications; D012849:Sinoatrial Node / Q000033:anatomy & histology*; D013575:Syncope / Q000209:etiology