title: Analysis of factors related to jugular venous oxygen saturation during cardiopulmonary bypass.
abstract: OBJECTIVE
  To investigate preoperative clinical conditions and/or intraoperative physiologic variables related to jugular venous oxygen saturation (SjO2) during cardiopulmonary bypass (CPB).
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  General hospital, single institution.
  
  
  METHODS
  One hundred forty patients (52 women, 88 men) who underwent coronary artery bypass grafting.
  
  
  RESULTS
  The authors measured SjO2 at five times during surgery. Multiple stepwise regression analysis showed a significant correlation of SjO2 with (1) arterial carbon dioxide partial pressure (PaCO2) before CPB (standard regression coefficient [(SC)] = 0.435), (2) cerebral perfusion pressure (CPP) during initiation of CPB (SC = 0.259), (3) PaCO2, tympanic temperature (TT), bubble oxygenator, and cerebral small infarctions (CSIs) during hypothermic CPB (SC = 0.507, -0.237, -0.192, and -0.189, respectively), (4) CPP, PaCO2, CSIs, and bubble oxygenator during rewarming (SC = 0.476, 0.294, -0.220, and -0.189, respectively), and (5) PaCO2 after CPB (SC = 0.480; p < 0.01). Correlation coefficients between SjO2 and CPP during rewarming were 0.40 (0.46 without CSI and 0.37 with CSI; p < 0.01). These results indicate that the relationship between CPP and SjO2 was significant in patients with CPP less than 40 mmHg during rewarming.
  
  
  CONCLUSIONS
  During rewarming, when cerebral perfusion and oxygen demand change abruptly, but not during stable hypothermic CPB, CPP was a significant factor related to sjO2.
authors.affiliation: Department of Anesthesiology, Kumamoto Chuo Hospital, Kumamoto City, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yoshitake
authors.forename: T
authors.initials: T
authors.lastname: Goto
authors.forename: T
authors.initials: T
authors.lastname: Baba
authors.forename: Y
authors.initials: Y
authors.lastname: Shibata
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001794:Blood Pressure / Q000502:physiology; D001831:Body Temperature / Q000502:physiology; D002245:Carbon Dioxide / Q000097:blood; D002315:Cardiopulmonary Bypass; D002544:Cerebral Infarction / Q000209:etiology; D002560:Cerebrovascular Circulation / Q000502:physiology; D001026:Coronary Artery Bypass; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007036:Hypothermia, Induced / Q000009:adverse effects; D007601:Jugular Veins; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D010100:Oxygen / Q000097:blood*; D010106:Oxygenators; D010313:Partial Pressure; D011446:Prospective Studies; D012044:Regression Analysis; D017694:Rewarming
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen