Assessment of hypothermia with a new "tympanic" thermometer.
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).


CONCLUSIONS
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.
Walpoth
B H
BH
Department of Thoracic and Cardiovascular Surgery, University Hospital, Berne, Switzerland.
Galdikas
J
J
Leupi
F
F
Muehlemann
W
W
Schlaepfer
P
P
Althaus
U
U
D000328:Adult; D002315:Cardiopulmonary Bypass; D017558:Elective Surgical Procedures; D006801:Humans; D007035:Hypothermia / Q000175:diagnosis*; D008991:Monitoring, Physiologic / Q000295:instrumentation; D012016:Reference Values; D013696:Temperature; D013821:Thermometers