斜视矫正手术对双眼视觉功能影响的临床研究

目的:探讨斜视矫正手术对双眼视觉功能的影响。方法:将收集的85例斜视患者根据斜视类型分组,共同性外斜视组51例,占60.00%;共同性内斜视组16例,占18.82%。麻痹性斜视组13例,占15.30%,特殊类型斜视组5例,占5.88%。同视机检查并记录患者术前及术后双眼视功能情况。结果:外斜视手术方式多选用单眼外直肌后徙+内直肌缩短术,内斜视手术主要选用双眼内直肌后徙术,上斜肌麻痹多行患眼下斜肌适量后徙或转位术,麻痹性内斜和外斜手术方式为患眼水平肌后徙联合缩短术,外斜V征手术方式为双眼外直肌后徙联合上移半个肌腱,伴有斜肌亢进者需同时行斜肌减弱术,固定性内斜1例手术方式为患眼内直肌断键+直肌联结术。85例患者术后正位73例(85.89%),双眼视觉功能手术前后比较有显著性差异(P0.05),术后较术前可见明显改善。结论:斜视矫正手术可促进双眼视觉功能的恢复,尤其是对于学龄前儿童效果更明显。     

氟比洛芬酯用于小儿斜视手术的临床研究

目的观察氟比洛芬酯用于小儿斜视手术术后镇痛的有效性和安全性。方法将60例择期行斜视手术的息儿随机分为两组,每组30例。所有患儿均采用丙泊酚、瑞芬太尼靶控输注（TCI）全凭静脉麻醉方法。诱导采用丙泊酚效应室靶浓度为3μg／ml,瑞芬太尼血浆靶控浓度为3ng／ml,达预设浓度后静注维库溴铵0．1mg／kg,气管插管后行机械通气;麻醉维持为丙泊酚2～4μg／ml,瑞芬太尼3～4ng／ml,必要时追加维库溴铵。镇痛组于手术结束前15min缓慢静脉注射氟比洛芬酯1mg／kg（用生理盐水稀释至5m1）,对照组于麻醉拔管后缓慢静注生理盐水5ml,两组注射时间均为2rain。记录苏醒时间、拔管时间、恢复室停留时间,观察有无恶心、呕吐、嗜睡、躁动及呼吸抑制等不良反应的发生。观察术后1、2、4、8、12、24h的镇痛评分,同时记录各时点的平均动脉血压、心率、血氧饱和度。结果对照组患儿术后1、2、4、6、8h的MAP、HR值均较镇痛组高（P〈0．05）;两组术后12、24h的MAP、HR值比较差异无统计学意义（P〉0．05）。两组患儿术后各时点Spoz比较差异无统计学意义（P〉0．05）。对照组患儿的苏醒时间和拔管时间均较镇痛组延长（P〈0．05）。但两组患儿恢复室停留时间比较差异无统计学意义（P〉0．05）。对照组患儿术后1、2、4、6、8h的VAS值均较镇痛组高（P〈0．05）;两组术后12、24h的VAS值比较差异无统计学意义（P〉0．05）。对照组患儿术后躁动明显较镇痛组多（P〈0．05）。镇痛组患儿出现恶心、呕吐各1例,而对照组出现恶心2例,呕吐3例,但差异无统计学意义（P〉0．05）。结论氟比洛芬酯起效快,镇痛作用时间长,血流动力学稳定,苏醒期平稳,不抑制中枢,不影响患儿的麻醉苏醒,提高了患儿术后的舒适度。氟比洛芬酯用于小儿斜视手术安全、有效。     

Ocular fixation with quadriceps tendon allograft

Management of difficult strabismus, such as strabismus fixus and paralytic strabismus, in order to maintain the alignment is complicated. There are many surgical approaches described in the current literature, together with notes on the materials used to stabilize these deformities. We present a new surgical approach using quadriceps tendon allograft for the correction of difficult strabismus such as strabismus fixus and paralytic strabismus. Our idea for using deep frozen quadriceps tendons developed from the fact that this is the most stable and strongest tendon in the whole body. Six patients with strabismus fixus (n = 1), paralytic strabismus secondary to extraocular muscle damage (n = 1) and combined cranial nerve palsy (n = 4) were operated on using a strip of deep frozen quadriceps tendon allograft suturedonto both the globe and the periosteum. The mean age of the patients was 44.33years. (range 17–71 years) All the patients were followed up for six months. The mean preoperative deviation in the six cases was 60 prism diopters(PD) (range 30–123 PD) The mean change in horizontal alignment at 1 month, 3 months and 6 months postoperatively was 54PD, 53 PD and 49.16 PD respectively. We had only one case of under correction. This may possible be due to the remaining function of the antagonist and/or the fact that we had used the distal end of the quadriceps tendon. When the patient (patient No. 5) who had 2 operations was excluded, the mean change in horizontal alignment was 48.6 PD,47.4PD and 43.6 PD. Post-operatively there was no infection or any other complications. According to our study of existing literature, these cases of deep frozen quadriceps tendon allograft application for the indications mentioned above are the first reported cases of its type. We conclude that ocular fixation with quadriceps tendon to the periosteum is a safe and effective option for the management of difficult strabismus. Further research on a larger cohort of patients and longer follow-up time are needed. This revised version was published online in July 2006 with corrections to the Cover Date.     

Atomic force microscopy determination of Young׳s modulus of bovine extra-ocular tendon fiber bundles

Extra-ocular tendons (EOTs) transmit the oculorotary force of the muscles to the eyeball to generate dynamic eye movements and align the eyes, yet the mechanical properties of the EOTs remain undefined. The EOTs are known to be composed of parallel bundles of small fibers whose mechanical properties must be determined in order to characterize the overall behavior of EOTs. The current study aimed to investigate the transverse Young?s modulus of EOT fiber bundles using atomic force microscopy (AFM).