title: Changes in body temperature during profound hypothermic cardiopulmonary bypass in adult patients undergoing aortic arch reconstruction.
abstract: OBJECTIVE
  Our aim was to characterize changes in body temperatures during profound hypothermic cardiopulmonary bypass (CPB) conducted with the sternum opened.
  
  
  METHODS
  In ten adult patients who underwent profound hypothermic (< 20 degrees C) CPB for aortic arch reconstruction, pulmonary arterial temperature (PAT), nasopharyngeal temperature (NPT), forehead deep-tissue temperature (FHT), and urinary bladder temperature (UBT) were recorded every 1 min throughout the surgery. In addition, the CPB venous line temperature (CPBT), a reasonable indicator of mixed venous blood temperature during CPB and believed to best reflect core temperature during stabilized hypothermia on CPB, was recorded during the period of total CPB.
  
  
  RESULTS
  PAT began to change immediately after the start of cooling or rewarming, closely matching the CPBT ( r = 0.98). During either situation, the other four temperatures lagged behind PAT ( P < 0.05); however, NPT followed PAT more closely than the other three temperatures ( P < 0.05). During stabilized hypothermia, PAT, NPT, and FHT, but not UBT, closely matched the CPBT, with gradients of less than 0.5 degrees C.
  
  
  CONCLUSIONS
  During induction of profound hypothermia and its reversal on total CPB with the heart in situ, a PA catheter thermistor, presumably because of its placement immediately behind the superior vena cava, would provide a reliable measure of the mixed venous blood temperature. During stabilized profound hypothermia, PAT, NPT, and FHT, but not UBT, serve as a reliable index of core temperature.
authors.affiliation: Department of Anesthesiology and Critical Care Medicine, Faculty of Medicine, Kyushu University, Higashi-ku, 812-8582, Fukuoka, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Akata
authors.forename: Ken
authors.initials: K
authors.lastname: Yamaura
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kandabashi
authors.forename: Shinya
authors.initials: S
authors.lastname: Sadamatsu
authors.forename: Shosuke
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000368:Aged; D001013:Aorta, Thoracic / Q000601:surgery*; D017545:Aortic Aneurysm, Thoracic / Q000601:surgery; D001769:Blood; D001831:Body Temperature; D002315:Cardiopulmonary Bypass; D005260:Female; D005385:Fingers; D005546:Forehead; D006324:Heart Arrest, Induced; D006801:Humans; D007036:Hypothermia, Induced; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D009305:Nasopharynx; D011651:Pulmonary Artery; D017694:Rewarming; D012881:Skin Temperature; D001743:Urinary Bladder; D014556:Urine; D014680:Veins