Evaluation of Temple Touch Pro^TM under Hypothermic Cardiopulmonary Bypass

Abstract

The purpose of this study was to compare the temperature estimated by TTP（T_TTP）and nasopharyngeal temperature（T_NASO）under hypothermic cardiopulmonary bypass. We examined the correlation and agreement between T_NASO and T_TTP. We identified 9 adult patients in whom T_TTP and T_NASO had been measured simultaneously during anesthesia for elective cardiovascular surgery. We compared T_NASO with T_TTP before CPB, during CPB with cooling T_NASO, during CPB with stable low T_NASO, during CPB with re-warming T_NASO, and after CPB. Correlations between absolute values of T_NASO and T_TTP were determined by linear regression. Bland-Altman analysis was used to examine the agreement between T_NASO and T_TTP. T_TTP was highly correlated with T_NASO in all 5 periods（p＜0.01）. Bland-Altman plots showed the 95％ LOA was not within ±0.5℃ in all 5 periods. Good agreement between the two methods of measurement was not seen. T_TTP and T_NASO have a good correlation but have poor agreement under hypothermic cardiopulmonary bypass.