• B H Walpoth, J Galdikas, F Leupi, W Muehlemann, P Schlaepfer, and U Althaus.
• Department of Thoracic and Cardiovascular Surgery, University Hospital, Berne, Switzerland.
• J Clin Monit. 1994 Mar 1; 10 (2): 91-6.

ObjectiveRapid 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.MethodsTympanic, 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.ResultsWe 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).ConclusionThe 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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