输尿管软镜碎石术治疗上尿路结石的疗效和安全性

目的探讨输尿管软镜碎石术(retrograde intrarenal stone surgery,RIRS)治疗上尿路结石的疗效和安全性。方法回顾性分析2016年4月至2019年1月武汉大学人民医院行RIRS的640例上尿路结石患者的临床资料。男424例,女216例。年龄(46.2±12.8)岁。结石最大径(1.4±0.7)cm。肾下盏结石126例,非肾下盏结石514例。单侧输尿管上段结石196例,单侧输尿管上段结石合并肾结石118例,单侧肾结石236例,双肾结石90例。104例术前留置双J管。马蹄肾8例,孤立肾合并肾功能不全30例,盆腔异位肾合并旋转不良4例,先天性输尿管畸形6例,海绵肾2例。术前血红蛋白(133.2±5.6)g/L,血清肌酐(84.4±12.2)μmol/L。手术均采用全麻,患者取截石位。采用输尿管软镜联合钬激光碎石,软镜顺利进入肾盂后首先观察肾盂及各肾盏并寻及结石。使用200μm光纤碎石,钬激光功率为12~45 W(0.5~1.5 J/10~30 Hz),根据实际情况辅助取石网篮套取结石。术中检查各肾盂、肾盏,确保结石已完全粉末化(结石最大径<0.3 cm),留置双J管和尿管。手术均由同等资历的术者完成。结果所有手术均顺利完成,手术时间(45.6±14.6)min。术后第1天复查血清肌酐(76.0±10.6)μmol/L,与术前比较差异有统计学意义(t=64.76,P<0.05);血红蛋白(126.4±9.6)g/L,与术前比较差异无统计学意义(t=2.02,P=0.064)。术后住院时间(4.8±1.5)d。术后3例(0.9%)发生严重并发症,分别为2例脓毒血症,1例包膜下血肿。术后3个月596例获得随访,其中552例达到结石清除标准,结石清除率(stone-free rate,SFR)为92.6%;余44例未达到结石清除标准者采用体外冲击波碎石、再次输尿管软镜手术或拔除双J管后观察。结石大小(χ^2=29.569,P<0.05)和位置(χ^2=44.949,P<0.05)是SFR的影响因素。多因素回归分析结果显示结石大小不是影响SFR的独立危险因素(P=0.639),结石位置是影响SFR的独立危险因素(P=0.013)。结论RIRS对于上尿路中小结石患者是一种可靠的治疗方式,疗效确切,并发症少,安全性高。但对于大结石及肾下盏结石的治疗还存在一定的局限性。肾下盏结石是影响RIRS疗效的独立危险因素。     

输尿管镜在急性梗阻性无尿中的应用

目的:探讨输尿管镜在急性梗阻性无尿的临床应用价值。方法:回顾性分析46例急性梗阻性无尿患者输尿管镜治疗的临床资料。结果:本组46例输尿管镜碎石取石术或输尿管镜检,术中留置单侧或双侧输尿管双J管,成功42例,失败4例,成功率91%。术后39例肾功能恢复正常,7例无好转,其中2例需要定期血液透析治疗。结论:输尿管镜在处理急性梗阻性无尿中具有重要作用,可迅速解除梗阻,保护肾功能。     

输尿管镜气压弹道碎石术治疗上尿路结石梗阻性急性肾功能衰竭(附14例报告)

目的探讨输尿管镜气压弹道碎石术治疗上尿路结石梗阻性急性肾功能衰竭的临床效果。方法于2001年9月～2003年5月收治上尿路结石梗阻性急性肾功能衰竭患者14例,血BUN17.8～53.2mmol/L,血Cr375～1950μmol/L,均急诊行输尿管镜气压弹道碎石术治疗。结果12例术后1周结石排净,2例两侧结石在碎石过程中上移进入肾盂,再行体外震波碎石术(ESWL)治疗后1个月排净;术后24h尿量3200～6500ml,术后1周13例血BUN、血Cr基本恢复正常。结论输尿管镜气压弹道碎石术治疗上尿路结石梗阻性急性肾功能衰竭,具有安全可靠、损伤小、并发症少、恢复快的优点,同时可处理双侧输尿管结石,缩短住院时间,是一种较好的治疗方法。     

Risk factors of complications during noninvasive mechanical ventilation -assisted flexible bronchoscopy

PurposeFlexible bronchoscopy (FB) causes airway narrowing and may cause respiratory failure (RF). Noninvasive mechanical ventilation (NIV) is used to treat RF. Until recently, little was known about noninvasive mechanical ventilation assisted flexible bronchoscopy (NIV-FB) risk and complications.Materials and methodsA retrospective analysis of NIV-FB performed in 20 consecutive months (July 1, 2018–February 29, 2020) was performed. Indications for: FB and NIV, as well as impact of comorbidities, blood gas results, pulmonary function test results and sedation depth, were analyzed to reveal NIV-FB risk. Out of a total of 713 FBs, NIV-FB was performed in 50 patients with multiple comorbidities, acute or chronic RF, substantial tracheal narrowing, or after previously unsuccessful FB attempt.ResultsIn three cases, reversible complications were observed. Additionally, due to the severity of underlining disease, two patients were transferred to the ICU where they passed away after >48h. In a single variable analysis, PaO₂ 69 ​± ​18.5 and 49 ​± ​9.0 [mmHg] (p ​< ​0.05) and white blood count (WBC) 10.0 ​± ​4.81 and 14.4 ​± ​3.10 (p ​< ​0.05) were found predictive for complications. Left heart disease indicated unfavorable NIV-FB outcome (p ​= ​0.046).ConclusionsNIV-FB is safe in severely ill patients, however procedure-related risk should be further defined and verified in prospective studies.     

A model to predict deflection of bevel-tipped active needle advancing in soft tissue

Active needles are recently being developed to improve steerability and placement accuracy for various medical applications. These active needles can bend during insertion by actuators attached to their bodies. The bending of active needles enables them to be steered away from the critical organs on the way to target and accurately reach target locations previously unachievable with conventional rigid needles. These active needles combined with an asymmetric bevel-tip can further improve their steerability. To optimize the design and to develop accurate path planning and control algorithms, there is a need to develop a tissue–needle interaction model. This work presents an energy-based model that predicts needle deflection of active bevel-tipped needles when inserted into the tissue. This current model was based on an existing energy-based model for bevel-tipped needles, to which work of actuation was included in calculating the system energy. The developed model was validated with needle insertion experiments with a phantom material. The model predicts needle deflection reasonably for higher diameter needles (11.6% error), whereas largest error was observed for the smallest needle diameter (24.7% error).     

寰枢椎后路柔性固定的生物力学研究

目的分析细棒、PEEK棒固定对寰枢关节稳定性的影响。方法采用6具新鲜成人枕骨(occipital bone,Oc)~颈椎C4节段进行测试,模拟以下手术及固定状态:①完整状态;②损伤状态:枢椎齿状突II型骨折;③坚强固定:寰枢椎均采用普通椎弓根螺钉固定,直径3.5 mm钛棒连接;④PEEK棒:直径3.5 mm的PEEK棒连接;⑤细棒:直径2.0 mm钛棒连接。采用重复测量实验设计,在完整、损伤和不同的固定状态下,通过脊柱试验机对标本分别施加1.5 N·m的前屈/后伸、左/右侧弯和左/右轴向旋转的纯力偶矩。采用Optotrak三维运动测量系统连续采集标本运动,分析寰枢椎之间角度运动范围和中性区。结果采用直径3.5 mm的钛棒,2.0 mm的细棒以及3.5 mm的PEEK棒固定后,在前屈、后伸、侧弯和旋转方向上均显著减小了固定节段的运动范围(P<0.05)。直径3.5 mm和2.0 mm的棒固定后的运动范围,在各个方向上无显著性差异。PEEK棒固定的运动范围仅在侧弯方向上大于坚强固定(P=0.005),其他方向无显著性差异。3种固定方式在屈伸、侧弯和旋转方向上均显著减小了固定节段的中性区(P<0.05)。各种固定方式之间相比较,无显著性差异(P>0.05)。结论在寰枢关节采用直径2.0 mm的细棒固定,与坚强固定的稳定性相当。采用直径3.5 mm的PEEK棒固定,在前屈、后伸、旋转方向上与坚强固定的稳定性相当,在侧弯方向上弱于坚强固定。