Study And Analysis Of The Effect Of Thyroid Surgery Position On Local Cerebral Oxygen Saturation

Objective:Objective to study the effect of thyroid surgery position on local cerebral oxygen saturation,and to analyze the correlation between other influencing factors and cerebral oxygen saturation changes,and to measure the head backward angle of the current thyroid surgery position.Methods:Methods 50 patients who underwent elective thyroid surgery,aged between 40 and 65 years old,and only underwent thyroid surgery during the same period,ASA grade I-II,were selected to explain the cerebral oxygen saturation monitoring process and general anesthesia operation plan to patients and their families before operation,and informed consent was obtained.After entering the room,the venous pathway was routinely opened,and the probe of the local cerebral oxygen saturation monitor was fixed on the upper edge of the patient’s forehead and eyebrow arch to monitor the local cerebral oxygen saturation.NBP,ECG,Sp O₂,ETCO₂and BIS were routinely monitored.The r Sc O₂,HR,MAP,ETCO₂,BIS were recorded at the time of entering the room in supine position（T0）,general anesthesia tracheal intubation（T1）,operation position（T2）,5 min after operation position（T3）,and recovery of supine position（T4）.The length of operation,the presence or absence of cervical lymph node dissection,the head angle at T0 and the head backward angle at T2 were recorded.Results:1.The r Sc O₂was（70.45±2.13）%in supine position（T0）,（74.32±2.36）%in tracheal intubation（T1）and（70.94±2.34）%in operation position（T2）.The r Sc O₂was（68.77±2.06）%at 5 min after operation（T3）,and（74.34±2.56）%at supine position（T4）.2.Comparison of r Sc O₂at 5 different times in this group of patients,the results were statistically significant（F=226.63,P=0.000）,among which pairwise comparison:except for T0 and T2 comparison（t=-1.98,P=0.053）,T1 and T4 comparison（t=-0.13,P=0.90）There was no statistical significance,and the other 8 groups were statistically significant.3.There was no significant correlation between HR,MAP,ETCO₂,cervical lymph node dissection,operation time and r Sc O₂（P>0.05）.BIS was correlated with r Sc O₂（r=0.13,P=0.04）.4.Angle before head backward:70.10±1.43,Angle of head backward:95.01±2.84,Angle difference before and after head backward:24.90±3.16.Conclusion:Preoperative evaluation of ASA I-II patients in the thyroid position,the head back angle within a certain range,has a certain effect on the change of local cerebral oxygen saturation,the head back angle within the range of 95.01±2.84 is safe.