Anesthesia,Anesthetics,and Postoperative Cognitive Dysfunction in Elderly Patients

Postoperative cognitive dysfunction(POCD)remains a major issue that worsens the prognosis of elderly surgery patients.This article reviews the current research on the effect of different anesthesia methods and commonly utilized anesthetics on the incidence of POCD in elderly patients,aiming to provide an understanding of the underlying mechanisms contributing to this condition and facilitate the development of more reasonable anesthesia protocols,ultimately reducing the incidence of POCD in elderly surgery patients.

Recombinant chitinase-3-like protein 1 alleviates learning and memory impairments via M2 microglia polarization in postoperative cognitive dysfunction mice

Postoperative cognitive dysfunction is a seve re complication of the central nervous system that occurs after anesthesia and surgery,and has received attention for its high incidence and effect on the quality of life of patients.To date,there are no viable treatment options for postoperative cognitive dysfunction.The identification of postoperative cognitive dysfunction hub genes could provide new research directions and therapeutic targets for future research.To identify the signaling mechanisms contributing to postoperative cognitive dysfunction,we first conducted Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses of the Gene Expression Omnibus GSE95426 dataset,which consists of mRNAs and long non-coding RNAs differentially expressed in mouse hippocampus3 days after tibial fracture.The dataset was enriched in genes associated with the biological process"regulation of immune cells,"of which Chill was identified as a hub gene.Therefore,we investigated the contribution of chitinase-3-like protein 1 protein expression changes to postoperative cognitive dysfunction in the mouse model of tibial fractu re surgery.Mice were intraperitoneally injected with vehicle or recombinant chitinase-3-like protein 124 hours post-surgery,and the injection groups were compared with untreated control mice for learning and memory capacities using the Y-maze and fear conditioning tests.In addition,protein expression levels of proinflammatory factors(interleukin-1βand inducible nitric oxide synthase),M2-type macrophage markers(CD206 and arginase-1),and cognition-related proteins(brain-derived neurotropic factor and phosphorylated NMDA receptor subunit NR2B)were measured in hippocampus by western blotting.Treatment with recombinant chitinase-3-like protein 1 prevented surgery-induced cognitive impairment,downregulated interleukin-1βand nducible nitric oxide synthase expression,and upregulated CD206,arginase-1,pNR2B,and brain-derived neurotropic factor expression compared with vehicle treatment.Intraperitoneal administration of the specific ERK inhibitor PD98059 diminished the effects of recombinant chitinase-3-like protein 1.Collectively,our findings suggest that recombinant chitinase-3-like protein 1 ameliorates surgery-induced cognitive decline by attenuating neuroinflammation via M2 microglial polarization in the hippocampus.Therefore,recombinant chitinase-3-like protein1 may have therapeutic potential fo r postoperative cognitive dysfunction.

Impact of thoracic paravertebral block and sufentanil on outcomes and postoperative cognitive dysfunction in thoracoscopic lung cancer surgery

BACKGROUND Postoperative pain management and cognitive function preservation are crucial for patients undergoing thoracoscopic surgery for lung cancer(LC).This is achieved using either a thoracic paravertebral block(TPVB)or sufentanil(SUF)-based multimodal analgesia.However,the efficacy and impact of their combined use on postoperative pain and postoperative cognitive dysfunction(POCD)remain unclear.AIM To explore the analgesic effect and the influence on POCD of TPVB combined with SUF-based multimodal analgesia in patients undergoing thoracoscopic radical resection for LC to help optimize postoperative pain management and improve patient outcomes.METHODS This retrospective analysis included 107 patients undergoing thoracoscopic radical resection for LC at The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital between May 2021 and January 2023.Patients receiving SUF-based multimodal analgesia(n=50)and patients receiving TPVB+SUF-based multimodal analgesia(n=57)were assigned to the control group and TPVB group,respectively.We compared the Ramsay Sedation Scale and visual analog scale(VAS)scores at rest and with cough between the two groups at 2,12,and 24 h after surgery.Serum levels of epinephrine(E),angio-tensin Ⅱ(Ang Ⅱ),norepinephrine(NE),superoxide dismutase(SOD),vascular endothelial growth factor(VEGF),transforming growth factor-β1(TGF-β1),tumor necrosis factor-α(TNF-α),and S-100 calcium-binding proteinβ(S-100β)were measured before and 24 h after surgery.The Mini-Mental State Examination(MMSE)was administered 1 day before surgery and at 3 and 5 days after surgery,and the occurrence of POCD was monitored for 5 days after surgery.Adverse reactions were also recorded.RESULTS There were no significant time point,between-group,and interaction effects in Ramsay sedation scores between the two groups(P>0.05).Significantly,there were notable time point effects,between-group differences,and interaction effects observed in VAS scores both at rest and with cough(P<0.05).The VAS scores at rest and with cough at 12 and 24 h after surgery were lower than those at 2 h after surgery and gradually decreased as postoperative time increased(P<0.05).The TPVB group had lower VAS scores than the control group at 2,12,and 24 h after surgery(P<0.05).The MMSE scores at postoperative days 1 and 3 were markedly higher in the TPVB group than in the control group(P<0.05).The incidence of POCD was significantly lower in the TPVB group than in the control group within 5 days after surgery(P<0.05).Both groups had elevated serum E,Ang Ⅱ,and NE and decreased serum SOD levels at 24 h after surgery compared with the preoperative levels,with better indices in the TPVB group(P<0.05).Marked elevations in serum levels of VEGF,TGF-β1,TNF-α,and S-100β were observed in both groups at 24 h after surgery,with lower levels in the TPVB group than in the control group(P<0.05).CONCLUSION TPVB combined with SUF-based multimodal analgesia further relieves pain in patients undergoing thoracoscopic radical surgery for LC,enhances analgesic effects,reduces postoperative stress response,and inhibits postoperative increases in serum VEGF,TGF-β1,TNF-α,and S-100β levels.This scheme also reduced POCD and had a high safety profile.

Small extracellular vesicles secreted by induced pluripotent stem cell-derived mesenchymal stem cells improve postoperative cognitive dysfunction in mice with diabetes

Postoperative cognitive dysfunction(POCD)is a common surgical complication.Diabetes mellitus(DM)increases risk of developing POCD after surgery.DM patients with POCD seriously threaten the quality of patients’life,however,the intrinsic mechanism is unclear,and the effective treatment is deficiency.Previous studies have demonstrated neuronal loss and reduced neurogenesis in the hippocampus in mouse models of POCD.In this study,we constructed a mouse model of DM by intraperitoneal injection of streptozotocin,and then induced postoperative cognitive dysfunction by transient bilateral common carotid artery occlusion.We found that mouse models of DM-POCD exhibited the most serious cognitive impairment,as well as the most hippocampal neural stem cells(H-NSCs)loss and neurogenesis decline.Subsequently,we hypothesized that small extracellular vesicles secreted by induced pluripotent stem cell-derived mesenchymal stem cells(iMSC-sEVs)might promote neurogenesis and restore cognitive function in patients with DM-POCD.iMSC-sEVs were administered via the tail vein beginning on day 2 after surgery,and then once every 3 days for 1 month thereafter.Our results showed that iMSC-sEVs treatment significantly recovered compromised proliferation and neuronal-differentiation capacity in H-NSCs,and reversed cognitive impairment in mouse models of DM-POCD.Furthermore,miRNA sequencing and qPCR showed miR-21-5p and miR-486-5p were the highest expression in iMSC-sEVs.We found iMSC-sEVs mainly transferred miR-21-5p and miR-486-5p to promote H-NSCs proliferation and neurogenesis.As miR-21-5p was demonstrated to directly targete Epha4 and CDKN2C,while miR-486-5p can inhibit FoxO1 in NSCs.We then demonstrated iMSC-sEVs can transfer miR-21-5p and miR-486-5p to inhibit EphA4,CDKN2C,and FoxO1 expression in H-NSCs.Collectively,these results indicate significant H-NSC loss and neurogenesis reduction lead to DM-POCD,the application of iMSC-sEVs may represent a novel cell-free therapeutic tool for diabetic patients with postoperative cognitive dysfunction.

Effects of ulinastatin combined with dexmedetomidine on cognitive dysfunction and emergence agitation in elderly patients who underwent total hip arthroplasty

BACKGROUND With the continuous growth of the modern elderly population,the risk of fracture increases.Hip fracture is a common type of fracture in older people.Total hip arthroplasty(THA)has significant advantages in relieving chronic pain and promoting the recovery of hip joint function.AIM To investigate the effect of ulinastatin combined with dexmedetomidine(Dex)on the incidences of postoperative cognitive dysfunction(POCD)and emergence agitation in elderly patients who underwent THA.METHODS A total of 397 patients who underwent THA from February 2019 to August 2022.We conducted a three-year retrospective cohort study in Shaanxi Provincial People’s Hospital.Comprehensive demographic data were obtained from the electronic medical record system.We collected preoperative,intraoperative,and postoperative data.One hundred twenty-nine patients who were administered Dex during the operation were included in the Dex group.One hundred fifty patients who were intravenously injected with ulinastatin 15 min before anesthesia induction were included in the ulinastatin group.One hundred eighteen patients who were administered ulinastatin combined with Dex during the operation were included in the Dex+ulinastatin group.The patients’perioperative conditions,hemodynamic indexes,postoperative Mini-Mental State Examination(MMSE)scores,Ramsay score,incidence of POCD,and serum inflammatory cytokines were evaluated.RESULTS There was a significant difference in the 24 h visual analogue scale score among the three groups,and the score in the Dex+ulinastatin group was the lowest(P<0.05).Compared with the Dex and ulinastatin group,the MMSE scores of the Dex+ulinastatin group were significantly increased at 1 and 7 d after the operation(all P<0.05).Compared with those in the Dex and ulinastatin groups,incidence of POCD,levels of serum inflammatory cytokines in the Dex+ulinastatin group were significantly decreased at 1 and 7 d after the operation(all P<0.05).The observer’s assessment of the alertness/sedation score and Ramsay score of the Dex+ulinastatin group were significantly different from those of the Dex and ulinastatin groups on the first day after the operation(all P<0.05).CONCLUSION Ulinastatin combined with Dex can prevent the occurrence of POCD and emergence agitation in elderly patients undergoing THA.

Adaptive and regulatory mechanisms in aged rats with postoperative cognitive dysfunction

Inflammation may play a role in postoperative cognitive dysfunction. 5＇ Adenosine monophos- phate-activated protein kinase, nuclear factor-kappa B, interleukin-1β, and tumor necrosis factor-a are involved in inflammation. Therefore, these inflammatory mediators may be involved in postoperative cognitive dysfunction. Western immunoblot analysis revealed 5＇ adenosine mo- nophosphate-activated protein kinase and nuclear factor-kappa B in the hippocampus of aged rats were increased 1-7 days after splenectomy. Moreover, interleukin-1β and tumor necrosis fac- tor-α were upregulated and gradually decreased. Therefore, these inflammatory mediators may participate in the splenectomy model of postoperative cognitive dysfunction in aged rats.

Aspartic acid in the hippocampus:a biomarker for postoperative cognitive dysfunction

This study established an aged rat model of cognitive dysfunction using anesthesia with 2% iso- flurane and 80% oxygen for 2 hours. Twenty-four hours later, Y-maze test results showed that isoflurane significantly impaired cognitive function in aged rats. Gas chromatography-mass spectrometry results showed that isoflurane also significantly increased the levels of N,N-diethy- lacetamide, n-ethylacetamide, aspartic acid, malic acid and arabinonic acid in the hippocampus of isoflurane-treated rats. Moreover, aspartic acid, N,N-diethylacetamide, n-ethylacetamide and malic acid concentration was positively correlated with the degree of cognitive dysfunction in the isoflurane-treated rats. It is evident that hippocampal metabolite changes are involved in the formation of cognitive dysfunction after isoflurane anesthesia. To further verify these results, this study cultured hippocampal neurons in vitro, which were then treated with aspartic acid （100 μmol/L）. Results suggested that aspartic acid concentration in the hippocampus may be a biomarker for predicting the occurrence and disease progress of cognitive dysfunction.

Postoperative delirium:A tragedy for elderly cancer patients

In this editorial,we comment on the article by Hu et al entitled“Predictive modeling for postoperative delirium in elderly patients with abdominal malignancies using synthetic minority oversampling technique”.We wanted to draw attention to the general features of postoperative delirium(POD)as well as the areas where there are uncertainties and contradictions.POD can be defined as acute neurocognitive dysfunction that occurs in the first week after surgery.It is a severe postoperative complication,especially for elderly oncology patients.Although the underlying pathophysiological mechanism is not fully understood,various neuroinflammatory mechanisms and neurotransmitters are thought to be involved.Various assessment scales and diagnostic methods have been proposed for the early diagnosis of POD.As delirium is considered a preventable clinical entity in about half of the cases,various early prediction models developed with the support of machine learning have recently become a hot scientific topic.Unfortunately,a model with high sensitivity and specificity for the prediction of POD has not yet been reported.This situation reveals that all health personnel who provide health care services to elderly patients should approach patients with a high level of awareness in the perioperative period regarding POD.

Evaluation of Efficacy and Safety of Electro-acupuncture Precondition on Postoperative Cognitive Dysfunction (POCD) Following Knee Replacement in Elderly: A Randomized Controlled Trial

OBJECTIVE: To investigate that whether electro-acupuncture(EA) precondition can reduce the incidence of postoperative cognitive dysfunction(POCD) following knee replacement and its safety in elderly. METHODS: A total of 60 participants met the inclusion criteria were enrolled in a randomized controlled trial with the ratio of 1:1, with 30 cases in the treatment group and 30 cases in the control group. The participants in the treatment group were provided with realEA therapy whereas participants in control group were provided with placebo-EA therapy. Interventions were offered 5 days prior to the surgery, once daily, and for a total of 5 days. The scores of Mini-Mental State Examination(MMSE), and contents of serumal inflammatory cytokines including interleukin 1β(IL-1β) and tumor necrosis factor-α(TNF-α) were observed at 24 hours prior-and posterior-to the surgery respectively for assessing the incidence of POCD among patients. Meanwhile, adverse effects were monitored and recorded. RESULTS:(1) After surgery, both treatment group and control group showed a significant decrease in MMSE global scores(P < 0.001, < 0.001, respectively), and the score in control group decreased more significantly than that in treatment group(P < 0.05);(2) Contents of serumal IL-1β and TNF-α were significantly increased in both groups after 24 hours posterior to the surgery(P < 0.001), and the contents in control group increased more significantly than that in treatment group(P < 0.001);(3) After surgery, the incidence of POCD was 20% in treatment group versus 36.67% in control group. There was no statistical difference between 2 groups(P > 0.05);(4) No serious adverse events were reported in this trial, except 1 patient from treatment group had a slight hematoma after receiving acupuncture. CONCLUSION: EA precondition might reduce cognitive impairments after 24 hours posterior to knee replacement surgery in elderly through inhibiting expression of inflammatory cytokines, including both IL-1β and TNF-α. However, there is insufficient evidence to support that EA precondition could reduce incidence of POCD.

Cognitive clarity in colon surgery: The dexmedetomidine advantage

Colon cancer is one of the most prevalent cancers globally,especially in the older age group.A large number of older patients undergoing surgery for colon cancer suffer from postoperative cognitive dysfunction(POCD).The trial by Bu et al demonstrated that dexmedetomidine(Dex)significantly reduced the incidence of POCD compared to placebo in individuals undergoing colon cancer surgery.Additionally,better cerebral oxygenation and lower cerebral injury markers were reported with the use of Dex.The trial has some limitations,such as a single-center design and a smaller sample size,and further studies with larger patient populations and robust multi-center designs are warranted to establish these findings.

NP-23 Cascade Events for Delayed Postoperative Cognitive Dysfunction

Background:Postoperative cognitive dysfunction(POCD)can occur in patients with cardiac and non-cardiac surgeries.About 20%to 40%patients develop POCD at hospital discharge(a few days after surgery,acute POCD)and 10%elderly patients(>60 years old)have POCD at 3 months after surgery(delayed POCD).Age and degree of education are risk factors for delayed POCD.It has been shown that POCD is associated with increased mortality.Patients with POCD have a longer hospital stay and an increased rate of leaving job market.Thus,POCD is a very significant clinical syndrome during the perioperative period,which is recognized only in recent years.We and others have shown that neuroinflammation is a critical neuropathological process for POCD.However,neuroinflammation lasts for a few days after surgery.It is not known how such a short-lived neuropathological process lead to POCD a few months after surgery.To address this issue,a series of experiments were performed in my laboratory.Methods:Rats or mice were subjected to common carotid arterial exposure,a surgical component of carotid endarterectomy that is often performed in elderly patients.Their learning and memory were assessed at least one week after surgery.Their blood and brain tissues were harvested at various time after surgery for biochemical and structural analyses.Results:The surgery induced an increase of proinflammatory cytokines in the blood.The surgery also increased the expression of active matrix metallopeptidase 9(MMP-9)and its activity in the brain.This surgery induced POCD and neuroinflammation in wild-type mice but not in the MMP-9 knockout mice.P2X7 receptors and inflammasome were activated by the surgery.Inhibition of P2X7 receptors and P2X7 receptor knockout abolished POCD and neuroinflammation after surgery.The surgery decreased growth factor production and inhibition of neuroinflammation attenuated this decrease.The decreased growth factor expression occurred at 3 to 5 days after the surgery.Surgery increased histone deacetylase activity and inhibition of histone deacetylase attenuated the decrease of growth factor expression and the development of POCD.The surgery decreased neurogenesis in the hippocampus and application of growth factors to the brain attenuated this decrease and POCD.This decreased neurogenesis was observed 3 weeks after surgery.Finally,surgery impaired dendritic arborization that was assessed 3 weeks after surgery.Inhibition of histone deacetylases attenuated this impairment and POCD.Conclusion:Surgery induces a delayed POCD in rodents.Surgery results in systemic inflammation,which then activates MMP-9 to damage the brain-blood barrier to facilitate the systemic inflammation to be transmitted to the brain.Proinflammatory signals in the blood activate P2X7 receptors to induce neuroinflammation that inhibits growth factor expression through epigenetic regulation.Reduced growth factor expression results in decreased neurogenesis and dendritic arborization that then ultimately lead to the delayed POCD.Thus,surgery activates a series of cascade events to induce the delayed POCD.

Correlation Analysis Between BDNF and Postoperative Cognitive Dysfunction in Aged Rats

Objective:To investigate the relationship between BDNF and postoperative cognitive dysfunction among aged rats.Methods:36 SPF healthy aged male SD rats were randomly assigned to a control group and a model group,respectively,with 18 rats in each group.Abdominal exploration was performed on the rats in the model group after anesthesia,while the rats in the control group were not operated on after anesthesia.The escape latency and swimming distance of the two groups were analyzed on a day prior to surgery as well as on the first day,third day,and seventh day following surgery;the expression levels of BDNF protein in the hippocampus of rats in the two groups were compared on the first day,third day,and seventh day following surgery;the correlation between BDNF and escape latency and swimming distance was analyzed.Results:The escape latency and swimming distance of the rats in the control group on a day prior to surgery,the first day,third day,and seventh day following surgery did not differ significantly(p>0.05),but those in the model group had significant behavioral difference(p<0.05).On a day prior to surgery,the rats in both groups showed no significant behavioral difference in escape latency and swimming distance(p>0.05),but on the first day,third day,and seventh day following surgery,the escape latency and swimming distance of the rats in the model group were significantly longer than those in the control group(p<0.05).In the control group,there was no significant difference in the protein expression of BDNF in the hippocampus of rats on the first day,third day,and seventh day following surgery,but there was significant difference in the model group.On the first day,third day,and seventh day following surgery,the BDNF protein expression level in the rats’hippocampus of the control group was significantly higher than that of the model group(p<0.05).The data from Pearson correlation analysis confirmed that BDNF protein expression is negatively correlated with escape latency(r=-0.567,p<0.001)and swimming distance(r=-0.623,p<0.001).Conclusion:In aged rats,the BDNF protein expression level decreases,and the degree of cognitive dysfunction increases after surgery.

持续输注超低剂量右美托咪定对老年CAS患者血流动力学和术后认知功能的影响

目的探讨持续输注超低剂量右美托咪定对行颈动脉支架置入术(CAS)的老年患者血流动力学稳定性和术后认知功能的影响。方法选取106例于首都医科大学附属北京世纪坛医院择期行CAS的老年患者,随机分为右美托咪定组(D组,n=52)和对照组(C组,n=54)。观察2组患者麻醉诱导前15 min(T0)、麻醉诱导后5 min(T1)、置入支架前5 min(T2)、置入支架后5 min(T3)、气管拔管后5 min(T4)的血流动力学和脑灌注变化;计算平均动脉压(MAP)、心率(HR)和脑氧饱和度(rSO_(2))的标准差(SD),分别记作SD_(MAP)、SD_(HR)和SD_(rSO_(2))。应用蒙特利尔认知评估量表(MoCA)对患者进行认知功能评估,比较患者术前、术后认知功能的变化,评价2组患者术后认知功能障碍(POCD)的发生情况。结果D组患者SD_(MAP)、SD_(HR)和SD_(rSO_(2))均明显低于C组(P<0.05);D组麻醉药及血管活性药使用量明显低于C组(P<0.05);D组拔管时间明显短于C组(P<0.05);D组术后1 d MoCA评分明显高于C组,术后30 d POCD发生率明显低于C组(P<0.05)。结论持续输注超低剂量右美托咪定可维持血流动力学和脑灌注稳定,减少麻醉药物用量,促进术后认知功能恢复。

老年CPB下心脏手术患者的rSO_(2)监测及其与术后早期POCD的相关性

目的监测老年心肺转流术(CPB)下心脏手术患者的局部脑氧饱和度(rSO_(2))的变化,并分析其与术后认知功能障碍(POCD)发生的相关性。方法回顾性分析2022年9月至2023年12月于河南省胸科医院接受CPB下心脏手术的100例老年患者的临床资料,根据患者术后7 d内是否发生POCD分为POCD组39例和非POCD组61例。比较两组患者吸氧前rSO_(2)、CPB前期rSO_(2)平均值(rSO_(2mean))、CPB中期rSO_(2mean)、CPB后期rSO_(2mean)、术中最低rSO_(2),并采用Pearson法分析rSO_(2)与术后早期POCD发生的相关性。结果两组患者吸氧前的rSO_(2)、CPB前期rSO_(2mean)比较差异均无统计学意义(P>0.05);POCD组患者CPB中期rSO_(2mean)、CPB后期rSO_(2mean)、术中最低rSO_(2)分别为(64.00±5.37)%、(67.19±5.25)%、(60.07±5.99)%,明显低于非POCD组的(70.44±6.75)%、(72.38±5.70)%、(69.48±6.17)%,差异均有统计学意义(P<0.05);Pearson相关性分析结果显示,CPB中期rSO_(2mean)、CPB后期rSO_(2mean)、术中最低rSO_(2)与术后早期POCD均呈负相关(r=-0.453、-0.420、-0.605,P<0.05)。结论老年CPB下心脏手术患者术中rSO_(2)可出现降低,且CPB中期rSO_(2mean)、CPB后期rSO_(2mean)、术中最低rSO_(2)与术后早期POCD的发生均具有相关性,应受到临床关注。

脑氧饱和度在术后神经认知障碍预测中的应用进展

术后神经认知障碍(PND)是老年患者术后常见并发症,目前尚无有效的治疗方法,提前识别和干预是预防其发生发展的唯一策略。脑氧饱和度(rSO_(2))变化可反映脑组织氧合情况,研究发现术前、术中、术后rSO_(2)降低与PND的发生发展有关,rSO_(2)监测可用于PND的早期预测。

收肌管阻滞联合全麻对老年全膝关节置换术患者术后疼痛和认知功能的影响

目的探讨收肌管阻滞联合全身麻醉对老年全膝关节置换术(TKA)患者术后疼痛和认知功能的影响。方法采用随机数字表法将72例需行TKA的老年患者分为对照组和观察组,每组36例。对照组患者采用单纯全身静脉麻醉,观察组在对照组基础上行超声引导下收肌管阻滞,2组患者术后连接静脉自控镇痛泵(PCIA)。记录2组患者入室(T0)、置入喉罩(T1)、手术开始30 min(T2)及术毕(T3)心率(HR)、收缩压(SBP)和舒张压(DBP)。记录术后48 h内疼痛视觉模拟量表(VAS)评分,术后3 d白细胞介素(IL)-6、C-反应蛋白(CRP)水平和简易精神状态量表(MMSE)评分。记录2组丙泊酚和舒芬太尼用量、PCIA按压次数、苏醒时间、拔管时间、首次下床时间和住院时间。结果与对照组比较,观察组在T1、T2时间点HR降低,SBP和DBP升高(P<0.05);术后静息及活动后VAS评分、CRP和IL-6水平均降低,而MMSE评分升高(P<0.05);丙泊酚和舒芬太尼用量、PCIA按压次数、术后苏醒、拔管、首次下床及住院时间均降低(P<0.05)。结论超声引导下收肌管阻滞联合全身麻醉有助于减轻老年全膝关节置换手术患者术后疼痛,缓解应激反应,改善认知水平。

艾司氯胺酮的临床应用进展

艾司氯胺酮是氯胺酮的纯右旋同分异构体,与谷氨酸N-甲基-D-天冬氨酸受体和μ阿片受体亲和力更高,具有更强的镇静、镇痛、抗抑郁等作用,并且起效和消除迅速,抑制呼吸作用弱,可轻微兴奋循环系统,可扩张气管及支气管,不良反应发生率低,在精神疾病领域和临床麻醉应用广泛。本文对其临床应用及不良反应进行综述,以期为艾司氯胺酮在医疗使用中提供借鉴和参考。

老年髋部骨折病人术后认知功能与术中组织氧饱和度的关系

目的 分析术中组织氧饱和度与老年髋部骨折病人术后认知功能障碍(POCD)的相关性。方法 选取2020年1月至2022年6月本院诊治的老年髋部骨折病人215例,根据国际术后认知功能障碍研究组(ISPOCD)确定的“Z评分”法将病人分为POCD组(n=42)和非POCD组(n=173)。比较2组脑组织氧饱和度(SctO_(2))和下肢肌肉组织氧饱和度(SmtO_(2))的水平,采用Logistic回归模型分析老年髋部骨折病人POCD发生的危险因素;绘制ROC曲线分析相关因素对POCD的预测价值。结果 POCD组年龄、糖尿病病人占比、术中出血量、麻醉时间、手术时间、术后疼痛评分、hs-CRP水平均高于非POCD组,SctO_(2)水平和受教育年限则低于非POCD组(P<0.05)。Logistic回归分析显示,年龄≥80岁、合并糖尿病、术中出血量较多、低SctO_(2)是影响老年髋部骨折病人POCD发生的危险因素(P<0.05)。ROC曲线分析表明,以68%为最佳截断点,SctO_(2)预测老年髋部骨折病人术后第7天发生POCD的灵敏度、特异度和AUC分别为90.70%、90.17%和0.809(P<0.05)。结论 低SctO_(2)、年龄≥80岁、合并糖尿病、术中出血量较多是老年髋部骨折病人POCD的危险因素,且SctO_(2)对POCD具有很好的预测价值。

电针对术后认知功能障碍模型大鼠炎症反应和铁死亡影响的研究

背景术后认知功能障碍(POCD)是增加患者术后发病率和死亡率的重要原因之一。炎症反应和铁死亡是POCD发生的重要机制假说,而电针改善POCD患者学习和记忆功能机制尚不明确。目的观察电针对老年POCD大鼠学习记忆及炎性细胞因子和海马神经元铁死亡的影响,探讨电针改善POCD的作用机制。方法2022年1月—2023年2月选取18~20月龄SD大鼠72只,按照随机数字表法分为3组:对照组(n=24)、模型组(n=24)和电针组(n=24)。根据术后3、7 d两个观察时间点将每组大鼠分为2个亚组(对照组术后3 d亚组、对照组术后7 d亚组,模型组术后3 d亚组、模型组术后7 d亚组,电针组术后3 d亚组、电针组术后7 d亚组),每组12只。采用剖腹探查手术建立POCD模型,选取电针组大鼠百会穴和内关穴进行电针刺激。采用Morris水迷宫装置检测大鼠行为学表现,酶联免疫吸附试验检测血清、海马中白介素(IL)6、IL-10、肿瘤坏死因子α(TNF-α)的水平,海马组织脂质过氧化物(LPO)、Fe^(2+),免疫印迹法检测海马酰基辅酶A合成酶长链家族成员4(ACSL4)、铁蛋白重链1(FTH1)、血磷脂酰胆碱酰基转移酶3(LPCAT3)蛋白表达水平。采用透射电镜观察海马区神经细胞超微结构。结果术后3、7 d大鼠组别与时间对大鼠术前认知功能训练逃避潜伏期均不存在交互作用(P_(交互)>0.05),训练时间对逃避潜伏期主效应均显著(P_(时间)<0.05),组别对逃避潜伏期主效应均不显著(P_(组间)>0.05)。模型组术后3 d亚组逃避潜伏期高于对照组术后3 d亚组、电针组术后3 d亚组,穿越平台次数、目标象限停留时间低于对照组术后3 d亚组、电针组术后3 d亚组,电针组术后3 d亚组穿越平台次数低于对照组术后3 d亚组(P<0.05)。模型组术后7 d亚组逃避潜伏期高于对照组术后7 d亚组、电针组术后7 d亚组,穿越平台次数低于对照组术后7 d亚组,目标象限停留时间低于对照组术后7 d亚组、电针组术后7 d亚组(P<0.05)。模型组术后3 d亚组血清IL-6、TNF-α高于对照组术后3 d亚组、电针组术后3 d亚组,电针组术后3 d亚组TNF-α高于对照组术后3 d亚组,IL-10高于对照组术后3 d亚组、模型组术后3 d亚组(P<0.05)。模型组术后7 d亚组血清IL-6高于对照组术后7 d亚组,TNF-α高于对照组术后7 d亚组、电针组术后7 d亚组,电针组术后7 d亚组IL-10高于对照组术后7 d亚组、模型组术后7 d亚组(P<0.05)。模型组术后3 d亚组海马IL-6、TNF-α高于对照组术后3 d亚组、电针组术后3 d亚组,电针组术后3 d亚组IL-6、TNF-α高于对照组术后3 d亚组,IL-10高于对照组术后3 d亚组、模型组术后3 d亚组(P<0.05)。模型组术后7 d亚组海马IL-6、TNF-α高于对照组术后7 d亚组、电针组术后7 d亚组,电针组术后7 d亚组IL-10高于对照组术后7 d亚组、模型组术后7 d亚组(P<0.05)。模型组术后3 d亚组Fe^(2+)、LPO、ACSL4、LPCAT3高于对照组术后3 d亚组、电针组术后3 d亚组,电针组术后3 d亚组高于对照组术后3 d亚组,模型组术后3 d亚组FTH1低于对照组术后3 d亚组、电针组术后3 d亚组,电针组术后3 d亚组低于对照组术后3 d亚组(P<0.05)。模型组术后7 d亚组Fe^(2+)、LPO、ACSL4、LPCAT3高于对照组术后7 d亚组、电针组术后7 d亚组,FTH1低于术后7 d亚组、电针组术后7 d亚组(P<0.05)。模型组术后3、7 d亚组海马组织视野内细胞核双核膜结构清晰,核周隙未见明显增宽,形态不规则,表面凹凸不平;核内染色质浓缩边集;胞质内少量线粒体膜破裂,膜结构消失;部分内质网明显扩张;并可见部分髓鞘断裂,排列紊乱;电针组术后3、7 d亚组较模型组明显改善。结论炎性细胞因子失衡和神经元铁死亡可能是POCD发生的重要病因机制;电针能够改善POCD老年大鼠的学习记忆能力,其发挥脑保护作用机制可能与其调控全身和中枢炎性细胞因子水平以及神经元细胞铁死亡途径有关。

允许性高碳酸血症对老年糖尿病患者术后认知功能的影响

目的探讨允许性高碳酸血症对老年糖尿病患者术后认知功能的影响。方法选择全麻下行腹腔镜上腹部手术的老年糖尿病患者60例,将患者随机分为两组:允许性高碳酸血症通气糖尿病组(DH组)和常规通气糖尿病组(DR组),每组30例。另选择全麻下行腹腔镜上腹部手术非糖尿病老年患者60例,将患者随机分为两组:允许性高碳酸血症通气非糖尿病组(NH组)和常规通气非糖尿病组(NR组),每组30例。麻醉诱导后行机械通气,调控呼吸参数使DH组和NH组维持PaCO_(2)45~65 mmHg,DR组和NR组维持PaCO_(2)35~45 mmHg。记录气腹前5 min及气腹后5、15、30 min的PETCO_(2),并采集以上时点桡动脉、颈内静脉血样行血气分析,记录pH值、PaCO_(2),计算动脉-颈内静脉血氧含量差(Da-jvO_(2))和脑氧摄取率(CERO_(2))。检测麻醉诱导前及术后3 d的血清S100β蛋白浓度。记录术前1 d和术后1、3、7 d的蒙特利尔认知评估量表(MoCA)评分和术后认知功能障碍(POCD)的发生情况。结果与气腹前5 min比较,四组气腹后5、15、30 min时PETCO_(2)和PaCO_(2)明显升高,pH值、Da-jvO_(2)和CERO_(2)明显降低(P<0.05)。与麻醉诱导前比较,四组术后3 d血清S100β蛋白浓度均明显升高(P<0.05)。与术前1 d比较,四组术后1、3 d MoCA评分均明显降低(P<0.05)。与DR组比较,DH组气腹前5 min及气腹后5、15、30 min时PETCO_(2)明显升高,pH值、Da-jvO_(2)和CERO_(2)明显降低,术后3 d血清S100β蛋白浓度明显降低,术后1、3 d MoCA评分明显升高,POCD发生率明显降低(P<0.05)。与NR组比较,NH组气腹前5 min及气腹后5、15、30 min时PETCO_(2)明显升高,pH值、Da-jvO_(2)和CERO_(2)明显降低,术后3 d血清S100β蛋白浓度明显降低,术后1、3 d MoCA评分明显升高,POCD发生率明显降低(P<0.05)。与NH组比较,DH组气腹前5 min及气腹后5、15、30 min时Da-jvO_(2)和CERO_(2)明显升高,术后3 d血清S100β蛋白浓度明显升高,术后1、3 d MoCA评分明显降低(P<0.05)。结论允许性高碳酸血症可改善老年糖尿病患者术中脑氧代谢,降低术后血清S100β蛋白浓度,降低术后认知功能障碍的发生率。