Effects Of Air Warming Blanket On The Recovery Period Of Anesthesia In Elderly Patients Undergoing Total Knee Replacement

Objective: Air warming blanket of general anesthesia underwent unilateral total knee arthroplasty in elderly patients during anesthesia recovery period of temperature,hemodynamics and tourniquet induced acidosis.Methods: 40 cases of elderly patients undergoing unilateral total knee arthroplasty under general anesthesia,ASAI~III grade,aged 60~80 years old were selected.20 cases in each group were randomly divided into air warming group(A group)and control group(B group).A group used air warming blanket 38 ℃ ~43 ℃.B group used conventional quilt insulation.Temperature(T),systolic blood pressure(SBP),diastolic blood pressure(DBP),heart rate(HR)were observed and recorded in the operating room(T1),anesthesia recovery room(PACU)(T2),PACU15min(T3),PACU 30 min(T4),PACU45min(T5),PACU 60 min(T6)in the two groups of patients.Oxygen partial pressure(PO2),carbon dioxide partial pressure(PCO2),and lactic acid(LAC)was collected and recorded in two groups of patients with T1,T2,T4,T6.The time of the patients from the end of anesthesia to the modified Aldrete score more than 9 points were observed and recorded.The occurrence of adverse events(perioperative cardiovascular adverse reactions,chills)during the anesthesia recovery room(PACU)were observed and recorded in the two groups.Result:Patients in the recovery room of the time(T2)temperature were significantly lower than the(T1)into the operation room(P > 0.05).The difference was statistically significant that the body temperature of patients in group A were higher than that in B group after the time of30 min in the recovery room(T4);There was no significant difference in systolic bloodpressure and diastolic blood pressure between group A and B(P > 0.05);Two groups of patients with pH into the operating room time(T1),into the recovery room time(T2)(15min after releaseing tourniquet)were no statistical significance(P > 0.05).group A was higher than group B at T4 and T6 time,the difference was statistically significant(P < 0.05);A group,B group at each time point of PCO2,PO2 difference was not statistically significant(P> 0.05);Lactic acid of patients were from T2 to T6 time after entering PACU.The basal levels were higher than those in the operation room.A group T4 and T6 time LAC values decreased more significantly.A group was lower than the same time point B group;And patients in group B compared a group of patients from the end of anesthesia to shorten the time modified Aldrete score greater than or equal to 9 points,the difference is statistically significant(P < 0.05);A group of patients in anesthesia recovery room(PACU)during the chills,the incidence rate of adverse events was lower than that of B group.Conclusion: Elderly patients with total knee arthroplasty patients in Post-anesthesia care unit with air warming blanket can make the patient’s temperature rapid recovery and improve the degree of acidosis and significantly shortened the time of from the end of anesthesia to the modified Aldrete score more than 9 points,reduce the anesthesia recovery period of cardiovascular event rates and chills.