title: Temperature during cardiopulmonary bypass: the discrepancies between monitored sites.
abstract: We performed studies in patients to determine whether temperature recordings from sites commonly monitored during hypothermic cardiopulmonary bypass adequately reflect cerebral temperature. In Study I (n = 12), temperatures monitored in the jugular bulb (JB) were compared with those recorded in the nasopharynx, esophagus, bladder, and rectum. In Study II (n = 30), temperature was also monitored in the arterial outlet of the membrane oxygenator. A calibrated recorder continuously and simultaneously recorded all temperatures. Study I found large temperature discrepancies between the JB and all other body sites during cooling and rewarming. There was considerable interindividual variability in the degree of discrepancy between the JB and other sites. Study II produced similar results but also showed that JB temperature reached equilibration with the temperature of blood entering the patient via the arterial outlet of the membrane oxygenator after cooling for 3.3 +/- 1.3 min and after rewarming for 16.5 +/- 5.5 min. Analysis of variance revealed that this arterial outlet site had the smallest average discrepancy of all temperature sites relative to the JB site (P < 0.001). In summary, temperatures measured in body sites over-estimated JB temperature during cooling and under-estimated it during rewarming, whereas arterial outlet blood temperature provided a good approximation.
authors.forename: Nancy A
authors.initials: NA
authors.lastname: Nussmeier
authors.forename: Weiping
authors.initials: W
authors.lastname: Cheng
authors.forename: MariaRosa
authors.initials: M
authors.lastname: Marino
authors.forename: Tyler
authors.initials: T
authors.lastname: Spata
authors.forename: Shu
authors.initials: S
authors.lastname: Li
authors.forename: Gaile
authors.initials: G
authors.lastname: Daniels
authors.forename: Trevor
authors.initials: T
authors.lastname: Clark
authors.forename: William K
authors.initials: WK
authors.lastname: Vaughn
mesh_terms: D000368:Aged; D001831:Body Temperature; D002315:Cardiopulmonary Bypass; D004947:Esophagus / Q000503:physiopathology; D005260:Female; D006801:Humans; D007601:Jugular Veins / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D009305:Nasopharynx / Q000503:physiopathology; D012007:Rectum / Q000503:physiopathology; D017694:Rewarming; D001743:Urinary Bladder / Q000503:physiopathology