Objective To explore the protection effect and mechanism of preoperative ultrasound-guided stellate ganglion block(SGB)on lung in patients undergoing one-lung ventilation(OLV)during thoracoscopic surgery.Methods Eighty-four patients who underwent OLV during thoracoscopic lobectomy at the Affiliated Suzhou Hospital of Nanjing Medical University from January 2021 to April 2022 were selected as research subjects,and the patients were divided into the observation group and control group by using a random number table,with 42 patients in each group.Patients in the observation group received ultrasound-guided SGB before anesthesia induction,while patients in the control group did not undergo puncture procedures.Patients in both groups received the same anesthesia induction and maintenance protocols.Hemodynamic,respiratory and arterial blood gas parameters were recorded at various time points:upon entering the operating room(T0),before OLV(T1),30 minutes after OLV initiation(T2),60 minutes after OLV initiation(T3),completion of surgery(T4),and 30 minutes after extubation(T5).Oxygenation index(OI),intrapulmonary shunt rate(Qs/Qt)and pH values of patients in the two groups were compared at these time points.Venous blood were collected from patients in both groups at T0,T3 and T5,and enzyme-linked immunosorbent assay was employed to measure the levels of surfactant protein-A(SP-A),superoxide dismutase(SOD),malondialdehyde(MDA),interleukin-6(IL-6)and interleukin-10(IL-10).Postoperative SGB-related complications and pulmonary complications within 72 hours were recorded.Results The mean arterial pressure(MAP)and heart rate(HR)in both groups were significantly lower at T,,T2,and T3 compared to T0(P＜0.05);the MAP and HR at T4 and T5 had no statis-tically significant difference compared to those at T0(P＞0.05);there was no significant difference in MAP and HR at other time points(P＞0.05).MAP in the observation group at T1,T2 and T3 was significantly lower than that in the control group(P＜0.05),and HR in the observation group at T2 and T3 was significantly lower than that in the control group(P＜0.05);there were no significant differences in MAP and HR between the two groups at other time points(P＞0.05).There were no significant differences in pulse oxygen saturation(SpO2)between the two groups at T0-T5(P＞0.05).At T2 and T3,peak airway pressure(Ppeak)and respiratory rate(RR)were significantly higher than those at T,and T4,and tidal volume(TV)was significantly lower than that at T,and T4 in both groups(P＜0.05).Ppeak and TV in the observation group at T2 and T3 were significantly lower than those in the control group(P＜0.05);there were no significant differences in Ppeak and TV between the two groups at T1 and T4(P＞0.05).RR and partial pressure of end-tidal carbon dioxide(PetCO2)at T1-T4 showed no significant differences between the two groups(P＞0.05).The pH values at T0-T5 showed no significant differences between the two groups(all P＞0.05).The OI at T,had no significant difference compared to that at T0 in both groups(P＞0.05);OI at T2-T5 in both groups was significantly lower than that at T0(P＜0.05);OI in the observation group at T2-T5 was significantly higher than that in the control group(P＜0.05).Qs/Qt at T2-T5 was significantly higher than that at T0 and T1 in both groups(all P＜0.05);Qs/Qt in the observation group at T2-T5 was significantly lower than that in the control group(P＜0.05).At T3 and T5,serum SP-A and IL-6 levels in both groups were significantly higher than those at T0(P＜0.05);serum SP-A and IL-6 levels in the observation group at T3 and T5 were significantly lower than those in the control group(P＜0.05).At T3 and T5,serum IL-10 level in the control group were significantly lower than that at T0,while serum IL-10 level in the observation group were significantly higher than that at T0(P＜0.05).Serum IL-10 level in the observation group at T3 and T5 were higher than that in the control group(P＜0.05).At T3 and T5,serum MDA level in the control group was significantly higher than that at T0(P＜0.05);serum MDA level in the observation group showed no significant difference compared to that at T0(P＞0.05);serum MDA level in the observation group was significantly lower than that in the control group(P＜0.05).At T3 and T5,serum SOD level in the control group was significantly lower than that at T0,while serum SOD level in the observation group was significantly higher than that at T0(P＜0.05);serum SOD level in the observation group was significantly higher than that in the control group(P＜0.05).Four patients in the observation group experienced symptoms of unilateral recurrent laryngeal nerve block,and one patient experienced brachial plexus nerve block,but all improved within 24 hours after surgery.No other adverse reactions were observed during follow-up.Within 72 hours postoperatively,one patient in the control group experienced hypoxemia.Conclusion Preoperative ultrasound-guided SGB has lung-protective effects on patients undergoing OLV in thoracoscopic surgery,which significantly improves OI,reduces intrapulmonary shunts,and inhibits inflammatory response and oxidative stress.
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