退变性腰椎侧凸脊柱-骨盆矢状位影像学特点

目的 :观察退变性腰椎侧凸(DLS)患者脊柱-骨盆矢状位影像学特点,探讨脊柱-骨盆矢状位参数变化对DLS发生的影响。方法:回顾性分析103例DLS患者术前资料,男36例,女67例,年龄62.6±7.4(43~78)岁,并选取139例正常青年人群作为正常青年对照组,145例单纯颈椎病患者作为成年对照组,在脊柱全长正侧位X线片上测量各组冠状位、矢状位参数,包括L3倾斜角、侧凸Cobb角、冠状位平衡(CVA)、腰椎前凸角(LL)、矢状位平衡(SVA)、胸椎后凸角(TK)、骨盆入射角(PI)、骨盆倾斜角(PT)、骶骨倾斜角(SS)等,采用独立样本t检验比较DLS组与两对照组的各矢状位参数,并用Pearson相关分析DLS组各参数间相关性。结果:DLS组PI为50.4°±10.2°,显著高于正常青年对照组(45.1°±9.6°,P0.01)和成年对照组(46.9°±9.1°,P0.01)。与青年及成年对照组相比,DLS组LL、SS较小(P0.01),PT、SVA较大(P0.01);TK小于成年对照组(P0.01)。DLS组中合并退变性腰椎滑脱者37例(占35.9%),PI为53.1°±8.8°;无退变性腰椎滑脱者66例,PI为48.9°±10.6°,二者相比有统计学差异且均显著高于正常青年对照组(P0.05)。DLS组侧凸Cobb角与PT显著相关(P0.05),余冠状位参数与矢状位参数间未发现相关性;LL、PI、SS、PT两两之间显著相关(P0.01),LL、PT与TK显著相关(P0.01),SS与TK显著相关(P0.05),LL与SVA显著相关(P0.01)。结论 :DLS患者PI高于正常青年及颈椎病患者,高PI可能参与了DLS的发病机制;DLS患者退变、侧凸的腰椎仍存在调节矢状位平衡的能力。     

Prognostic Implications of Progressive Systemic Ventricular Dysfunction in Congenitally Corrected Transposition of Great Arteries

ObjectivesThe purpose of this study was to determine the risk factors for and prognostic implications of progressive right ventricular systolic dysfunction (RVD) in adults with congenitally corrected transposition of great arteries.BackgroundThere are no effective therapies for RVD; hence the need to identify and modify risk factors for progressive RVD.MethodsRV systolic function was assessed by using RV longitudinal strain (RV-LS). The first echocardiogram (baseline echocardiogram) and all subsequent annual echocardiograms performed within 5 years from the baseline echocardiogram were analyzed. Progressive RVD (temporal decline in RV-LS) was assessed as the average annual change in RV-LS within 5 years of imaging follow-up.ResultsOf 186 patients (mean age 40 ± 12 years), the RV-LS at baseline was –17% ± 4%, and the annual decline in RV-LS was –4% (95% CI: –6 to –2). The risk factors for progressive RVD were left ventricular (LV) systolic dysfunction, LV pacing, and systemic hypertension. Cardiovascular events (heart failure hospitalization, heart transplant, and death) occurred in 57 (27%) patients. Progressive RVD was associated with cardiovascular events, independent of RV systolic function at baseline. In subgroup analyses assessing impact of therapies (medical therapy, cardiac resynchronization therapy, and tricuspid valve replacement), only tricuspid valve replacement was associated with improvement in RV systolic function when performed before onset of RVD.ConclusionsPatients with congenitally corrected transposition of great arteries were at risk for progressive RVD, and the risk factors for progressive RVD were LV pacing, systemic hypertension, and concomitant LV dysfunction. Further studies are required to determine whether strict blood pressure control and early tricuspid valve replacement will prevent progressive RVD.     

Revision of loop colostomy under regional anaesthesia and sedation

Patients presenting for emergency abdominal procedures often have medical issues that cause both general anaesthesia and central neuraxial blockade to pose significant risks. Regional anaesthetic techniques are often used adjunctively for abdominal procedures under general anaesthesia, but there is limited published data on procedures done under peripheral nerve or plexus blocks. We herein report the case of a patient with recent pulmonary embolism and supraventricular tachycardia who required colostomy refashioning. Ultrasonography-guided regional anaesthesia was administered using a combination of ilioinguinal-iliohypogastric, rectus sheath and transversus abdominis plane blocks. This was supplemented with propofol and dexmedetomidine sedation as well as intermittent fentanyl and ketamine boluses to cover for visceral stimulation. We discuss the anatomical rationale for the choice of blocks and compare the anaesthetic conduct with similar cases that were previously reported.     

超声引导下腹横肌平面阻滞在剖宫产术后镇痛中的应用

目的 研究超声引导下腹横肌平面(transverses abdominis plane,TAP)阻滞在剖宫产术后镇痛中的应用.方法 择期行剖宫产术的产妇60例,ASA Ⅰ ～Ⅱ级,随机分为TAP组(T组,n=30)和对照组(C组,n=30).术前所有产妇均行腰-硬联合麻醉(L2～3间隙蛛网膜下腔,0.5布比卡因等比重液7.5 mg);术毕两组产妇均连接自控硬膜外镇痛(PCEA),镇痛泵配置相同;术毕T组产妇行双侧TAP阻滞(0.4％罗哌卡因).于术后4、6、8、24、28及48 h采用VAS评分法进行镇痛评分,观察恶心呕吐、瘙痒及呼吸抑制的情况,记录各时点产妇按压镇痛泵的累计有效次数、累计总次数、术后48 h内按压总次数与按压有效次数;术后镇痛用药量和满意度评分.记录TAP操作相关并发症,包括感染、血肿形成、神经损伤、局麻药的毒性反应、穿入腹腔、穿伤肠管、穿伤肝脏等.结果 T组术后4、6h静息状态VAS评分低于C组(P＜0.05),两组术后8、24、28、48 h静息状态VAS评分比较差异均无统计学意义(P＞0.05);T组术后4h活动状态VAS评分低于C组(P＜0.05),其他各时点两组VAS评分差异均无统计学意义(P＞0.05).T组术后6h的硬膜外镇痛用药量低于C组(P＜0.05),其他各时点两组比较差异无统计学意义(P＞0.05),但T组各时点用药量均少于C组.两组在各时点按压镇痛泵的累计有效次数、累计总次数及术后48 h内按压总次数与按压有效次数比值的差异均无统计学意义(P＞0.05).两组术后均无恶心呕吐、瘙痒、呼吸抑制、镇静过度等不良反应发生.T组无TAP操作相关并发症的发生.结论 TAP阻滞在剖宫产术后具有明显的辅助镇痛作用.     

Pulmonary Hypertension in Patients With Severe Aortic Stenosis: Prognostic Impact After Transcatheter Aortic Valve Replacement: Pulmonary Hypertension in Patients Undergoing TAVR

Objectives

The authors investigated the development of pulmonary hypertension (PH), predictors of PH regression, and its prognostic impact on short, mid-, and long-term outcomes in patients undergoing transcatheter aortic valve replacement (TAVR) for severe aortic stenosis (AS).

超声引导下腹横肌平面阻滞复合瑞芬太尼靶控输注在胰管结石体外震波碎石术中的应用

目的 评价超声引导下腹横肌平面阻滞联合瑞芬太尼靶控输注应用于胰管结石体外震波碎石术(ESWL)中的效果。方法 随机选择60例首次接受ESWL治疗胰管结石的患者,分为R组和TR组(每组n=30)。R组患者仅接受瑞芬太尼靶控输注(TCI),TR组患者接受瑞芬太尼TCI前30min接受超声引导下腹横肌平面阻滞。采用Dixon序贯法计算两组患者的瑞芬太尼半数有效量(EC₅₀),记录患者围术期视觉模拟疼痛量表(VAS)、Ramsay镇静量表、血流动力学参数、呼吸参数和不良事件。结果 R组和TR组患者瑞芬太尼EC₅₀分别为3.448ng/ml(95%CI:1.636~3.946)和2.523ng/ml(95%CI:0.744~2.991),差异具有统计学意义(P＜0.05)。两组患者疼痛和镇静评分相当。两组患者血流动力学和呼吸参数均无明显差异。与R组相比,TR组不良事件发生率更低(10% vs 56.7%,P＜0.001),瘙痒发生率更低(6.7% vs 26.7%,P=0.038)。结论 腹横肌平面阻滞联合瑞芬太尼靶控输注可为胰管结石ESWL提供满意的镇痛和镇静,且不良事件发生率更低。     

Parameter Identification of Cutting Forces in Crankshaft Grinding Using Artificial Neural Networks

The intensifying of the manufacturing process and increasing the efficiency of production planning of precise and non-rigid parts, mainly crankshafts, are the first-priority task in modern manufacturing. The use of various methods for controlling the cutting force under cylindrical infeed grinding and studying its impact on crankpin machining quality and accuracy can improve machining efficiency. The paper deals with developing a comprehensive scientific and methodological approach for determining the experimental dependence parameters’ quantitative values for cutting-force calculation in cylindrical infeed grinding. The main stages of creating a method for conducting a virtual experiment to determine the cutting force depending on the array of defining parameters obtained from experimental studies are outlined. It will make it possible to get recommendations for the formation of a valid route for crankpin machining. The research’s scientific novelty lies in the developed scientific and methodological approach for determining the cutting force, based on the integrated application of an artificial neural network (ANN) and multi-parametric quasi-linear regression analysis. In particular, on production conditions, the proposed method allows the rapid and accurate assessment of the technological parameters’ influence on the power characteristics for the cutting process. A numerical experiment was conducted to study the cutting force and evaluate its value’s primary indicators based on the proposed method. The study’s practical value lies in studying how to improve the grinding performance of the main bearing and connecting rod journals by intensifying cutting modes and optimizing the structure of machining cycles.     

椎板后路阻滞与竖脊肌平面阻滞的区别及临床应用

椎板后路阻滞与竖脊肌平面阻滞是近年发现的新型区域阻滞,此2 种阻滞方式皆被报道为椎旁 阻滞的改良技术,并逐渐应用于各类手术的围手术期镇痛。尽管穿刺部位相似,但目前国内外缺乏两者比较 的临床对照研究。区别于以往区域阻滞技术,该文从解剖结构、作用机制、临床应用等方面对椎板后路阻滞 与竖脊肌平面阻滞进行总结及比较,旨在探讨两者的临床应用特点及未来发展方向。