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  • Title: Assessment of hypothermia with a new "tympanic" thermometer.
    Author: Walpoth BH, Galdikas J, Leupi F, Muehlemann W, Schlaepfer P, Althaus U.
    Journal: J Clin Monit; 1994 Mar; 10(2):91-6. PubMed ID: 8207458.
    Abstract:
    OBJECTIVE: Rapid and accurate core temperature measurement is vitally important in trauma patients, especially in those with accidental hypothermia. We tested a new aural thermometer to measure "tympanic" temperatures and assessed its accuracy during normothermic and hypothermic cardiopulmonary bypass. METHODS: Tympanic, esophageal, and blood temperatures were compared in 10 patients undergoing open-heart surgery. In addition, the stability and reaction time of the tympanic thermometer was evaluated in 5 volunteers in a cold room, with and without facial fanning. RESULTS: We observed a good linear correlation between tympanic and esophageal (r = 0.96) and blood (r = 0.81) temperature measurements during normothermia and hypothermia. There was no evidence of iatrogenic ear lesions in any of the patients. In the cold-room tests, stability was excellent and the time for adjustment of tympanic temperature measurement was about 2 min (with and without facial fanning). CONCLUSION: The new tympanic thermoprobe is a simple, fast, and reliable device for measuring core temperature. The device was designed particularly for, and may be useful for, patients suffering from accidental hypothermia.
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