Abstract: Objective To investigate the effective of bladder temperature（BT）and nasopharyngeal temperature（NT）monitoring in craniotomy，and to assess the differences and correlations between the two temperature monitoring methods.Methods Fifty patients（ASA Ⅰ～Ⅱ）with general anesthesia and undergoing craniotomy were selected.BT and NT were monitored during anesthesia，and temperature were recorded at the following time points：10 min（T₀）after anesthesia induction，immediately at the beginning of the operation（T₁），20min（T₂），40min（T₃），60min（T₄），80min（T₅），100min（T₆），120min（T₇），140min（T₈），160min（T₉），180min（T₁₀），200min（T₁₁），220min（T₁₂），240min（T₁₃）after surgical incision and at the end of the surgery（T₁₄），the related complications were recorded simultaneously.Results The overall BT was（0.40±0.21）℃ higher than that of NT，and the difference was statistically significant（P<0.01），but the consistency was better.The incidence of NT below 36℃ was significantly higher than that of BT（P＜0.05）.The temperature of the two different parts was highly correlated，and the correlation coefficient was r=0.93，the linear equation is：Y=0.943X+2.449（Y is bladder temperature and X is nasopharyngeal temperature）.Three patients（about 6%）with NT monitoring developed nasal mucosal hemorrhage after surgery.Conclusion Both BT and NT monitoring can reflect the changes of body temperature during craniotomy，but NT may respond more quickly，and the BT may be closer to the core body temperature and be convenient.

Key words: craniotomy, general anesthesia, bladder temperature, nasopharyngeal temperature, body temperature monitoring