Temperature monitored on the cuff surface of an endotracheal tube reflects body temperature.
OBJECTIVE
When treating patients with cardiac arrest with mild therapeutic hypothermia, a reliable and easy-to-use temperature probe is desirable. This study was conducted to investigate the accuracy and safety of tracheal temperature as a measurement of body temperature.


METHODS
Observational cohort study.


METHODS
Emergency department of a tertiary care university hospital.


METHODS
Patients successfully resuscitated from cardiac arrest intended for mild hypothermia therapy.


METHODS
Intubation was performed with a newly developed endotracheal tube that contains a temperature sensor inside the cuff surface. During the cooling, mild hypothermia maintenance, and rewarming phases, the temperature was recorded minute by minute. These data were compared with the temperature assessed by esophageal and blood temperature probes. Thereafter, tracheoscopy was performed to evaluate the condition of the tracheal mucosa.


RESULTS
Approximately 2000 measurements per temperature sensor per patient were recorded in 21 patients. The mean bias between the blood temperature and the tracheal temperature was -0.16 degrees C (limits of agreement: -0.36 degrees C to 0.04 degrees C). The mean bias between the esophageal and tracheal temperatures was -0.22 degrees C (limits of agreement: -0.49 degrees C to 0.07 degrees C). Agreement between temperature probes investigated by the Bland-Altman method showed a mean bias of less than -(1/4) degrees C, and time lags assessed graphically by hysteresis plots were negligible. No clinically relevant injury to the tracheal mucosa was detected.


CONCLUSIONS
Temperature monitoring at the cuff surface of an endotracheal tube is safe and provides accurate and reliable data in all phases of therapeutically induced mild hypothermia after cardiac arrest.
Haugk
Moritz
M
Department of Emergency Medicine, Medical University of Vienna, Vienna, Austria.
Stratil
Peter
P
Sterz
Fritz
F
Krizanac
Danica
D
Testori
Christoph
C
Uray
Thomas
T
Koller
Julia
J
Behringer
Wilhelm
W
Holzer
Michael
M
Herkner
Harald
H
D000368:Aged; D001831:Body Temperature; D015331:Cohort Studies; D004636:Emergency Service, Hospital; D005260:Female; D006323:Heart Arrest / Q000628:therapy*; D006785:Hospitals, University; D006801:Humans; D007036:Hypothermia, Induced / Q000379:methods*; D007442:Intubation, Intratracheal / Q000379:methods*; D008297:Male; D008875:Middle Aged