title: Posterior distribution of infarcts in strokes related to cardiac operations.
abstract: BACKGROUND
  Stroke complicates cardiac surgical procedures in a substantial number of patients. The mechanism of stroke is predominantly embolic, although hypoperfusion may play a role. The aim of this study was to determine whether radiologic appearances in this population were consistent with an embolic cause.
  
  
  METHODS
  We reviewed computed tomographic scans and medical records in 24 patients who suffered stroke after cardiac operation. Stroke was evident at 24 hours in 19 patients (79%). Infarcts were multiple in 16 and single in 3 patients (group 1). The remaining 5 patients suffered stroke beyond 24 hours and had single infarcts on computed tomographic scan (group 2).
  
  
  RESULTS
  In group 1, 15 patients (79%) had bilateral cerebellar infarcts, 4 (74%) had posterior cerebral artery infarcts, 10 (53%) had posterior watershed infarcts, and 11 patients (58%) had middle cerebral artery branch infarcts. The mean number of vascular territories involved was 5.1 (range, 1 to 10). Mobile atheromatous plaque was present in the ascending aorta or arch in 5 of 9 patients (56%) in group 1. In group 2, stroke occurred in close association with atrial or ventricular fibrillation in 3 of 5 patients (60%).
  
  
  CONCLUSIONS
  In patients with radiologic evidence of infarction, perioperative strokes after cardiac operation are typically multiple, and involve the posterior parts of the brain, consistent with atheroembolization. Delayed strokes may be attributable to cardiogenic embolism.
authors.affiliation: Department of Neurology, Cornell University Medical College, New York, New York, USA.
authors.forename: D
authors.initials: D
authors.lastname: Barbut
authors.forename: D
authors.initials: D
authors.lastname: Grassineau
authors.forename: E
authors.initials: E
authors.lastname: Lis
authors.forename: L
authors.initials: L
authors.lastname: Heier
authors.forename: G S
authors.initials: GS
authors.lastname: Hartman
authors.forename: O W
authors.initials: OW
authors.lastname: Isom
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001011:Aorta / Q000000981:diagnostic imaging; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging; D001018:Aortic Diseases / Q000000981:diagnostic imaging / Q000209:etiology; D001161:Arteriosclerosis / Q000000981:diagnostic imaging / Q000209:etiology; D001281:Atrial Fibrillation / Q000209:etiology; D006348:Cardiac Surgical Procedures / Q000009:adverse effects*; D002531:Cerebellum / Q000098:blood supply; D002536:Cerebral Arteries / Q000000981:diagnostic imaging; D002544:Cerebral Infarction / Q000000981:diagnostic imaging / Q000209:etiology*; D002560:Cerebrovascular Circulation; D002561:Cerebrovascular Disorders / Q000000981:diagnostic imaging / Q000209:etiology*; D017548:Echocardiography, Transesophageal; D004617:Embolism / Q000000981:diagnostic imaging / Q000209:etiology; D005260:Female; D006801:Humans; D007238:Infarction / Q000000981:diagnostic imaging / Q000209:etiology; D002542:Intracranial Embolism and Thrombosis / Q000000981:diagnostic imaging / Q000209:etiology; D007431:Intraoperative Complications / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D014693:Ventricular Fibrillation / Q000209:etiology