• H P Grocott, M F Newman, N D Croughwell, W D White, E Lowry, and J G Reves.
• Department of Anesthesiology, Duke Heart Center, Duke University Medical Center, Durham, NC 27710, USA.
• J Clin Anesth. 1997 Jun 1;9(4):312-6.

Study ObjectiveTo compare jugular venous to nasopharyngeal temperature during hypothermic cardiopulmonary bypass (CPB).DesignProspective observational study.SettingTertiary care teaching hospital.Patients5 ASA physical status IV patients (40 to 65 years of age) having cardiac surgery with hypothermic CPB. INTERVENTIONS, MEASUREMENTS AND MAIN RESULTS: Jugular venous and nasopharyngeal temperatures were recorded throughout the procedure with comparisons made during four time periods: pre-CPB, during CPB, during rewarming, and post-CPB. The patients underwent 85.8 +/- 45.8 minutes (mean +/- SD) of hypothermic CPB, cooling to 26.3 +/- 7.6 degrees C (nasopharyngeal) followed by rewarming at 0.35 +/- 0.1 degree C (nasopharyngeal)/min. There was a high degree of precision between the two temperature sites, but marked differences in bias. In particular, temperature bias was more pronounced during rewarming from CPB compared with other time periods (p < 0.05) where jugular venous temperature was greater than nasopharyngeal temperature by 3.4 degrees C.ConclusionNasopharyngeal temperature underestimates jugular venous temperature during rewarming from hypothermic CPB. As a result, the brain may be exposed to periods of hyperthermia, possibly increasing the risk of neurologic injury associated with CPB.

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