The rate of lactic acid removal in relation to different baselines of recovery exercise

Summary During strenuous exercise lactic acid (LA) appears in the blood as a result of anaerobic metabolism. The rate at which this LA was removed from the blood after exercise was seen to increase to a maximum with a certain level of post exercise activity. This maximum rate of removal of LA appears to be at approximately 40% of the individual's maximum oxygen uptake when the exercise is performed on a bicycle ergometer.     

Clinical outcome after surgery on schwannomas in the extremities

BACKGROUND Schwannoma is a benign, encapsulated and slowly growing tumor originating from Schwann cells and is rarely seen in the peripheral nerve system. Typical symptoms are soreness, radiating pain and sensory loss combined with a soft tissue mass.AIM To evaluate pre-and postoperative symptoms in patients operated for schwannomas in the extremities and investigate the rate of malignant transformation.METHODS In this single center retrospective study design, all patients who had surgery for a benign schwannoma in the extremities from May 1997 to January 2018 were included. The location of the tumor in the extremities was divided into five groups; forearm, arm, shoulder, thigh and leg including foot. The locations of the tumor in the nerves were also categorized as either; proximal, distal, minor or major nerve. During the pre-and postoperative clinical evaluation, symptoms were classified as paresthesia, local pain, radiating pain, swelling, impairment of mobility/strength and asymptomatic tumors that were found incidentally(with magnetic resonance imaging). The patients were evaluated after surgery using the following categories: Asymptomatic or symptomatic patients(radiating and/or local pain) and those with complications. The follow up period was from the time of surgery until last examination of the particular physician. Multivariate logistic regression analysis was performed to identify independent prognostic factors for postoperative significant symptoms at follow-up.RESULTS We identified 858 cases from the institutional pathology register. We excluded cases with duplicate diagnoses(n = 407), pathology not including schwannomas(n = 157), lesions involving the torso, spine and neck(n = 150) leaving 144 patients for further analysis. In this group 99 patients underwent surgery and there were five complications recorded: 2 infections(treated with antibiotics) and 3 nerve palsies(2 involving the radial nerve and one involving the median nerve) that recovered spontaneously. At the end of follow-up, 1.4 mo(range 0.5-76) postoperatively, we recorded a post-operative decrease in clinical symptoms: Local pain 76%(6/25), radiating pain 97%(2/45), swelling 20%(8/10). Symptoms of paresthesia increased by 2.8%(37/36) and there was no change in motor weakness before and after surgery 1%(1/1). Multivariate analysis showed that tumors located within minor nerves had a significantly higher prevalence of postoperative symptoms compared with tumors in major nerves(odds ratio: 2.63; confidence intervals: 1.22-6.42, P = 0.029). One patient with schwannoma diagnosed by needle biopsy was diagnosed to have malignant transformation diagnosed in the surgically removed tumor. No local recurrences were reported.CONCLUSION Surgery of schwannomas can be conducted with low risk of postoperative complications, acceptable decrease in clinical symptoms and risk of malignant transformation is low.     

Anatomic basis of vascular distribution in combined removal of liver and pancreas (28.5.93)

Summary Based on the study of the arterial distribution of 120 hepatic grafts removed from brain-dead patients, the authors assess the possibilities of vascular partition in cases of combined removal of the liver and pancreas. The discussion deals with the vascular distribution of each organ. The presence of a right hepatic artery arising from the superior mesenteric a. (SMA) requires preservation of the SMA with the hepatic graft, while the pancreas is removed with the celiac trunk (CT) and its branches. The presence of a left hepatic artery arising from the CT requires its preservation with the hepatic graft, the pancreas being removed with the SMA and the splenic artery.

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Partage vasculaire des prélèvements hépatiques et pancréatiques combinés : bases anatomiques (28.5.93)

Résumé A partir de l'étude de la distribution artérielle de 120 greffons hépatiques prélevés sur des patients en état de mort cérébrale, les auteurs apprécient les possibilités de partage vasculaire en cas de prélèvement combiné foie-pancréas. La discussion porte sur la distribution vasculaire de chaque organe. L'existence d'une artère hépatique droite naissant de l'artère mésentérique supérieure (AMS) nécessite de conserver l'AMS avec le greffon hépatique, le pancréas est prélevé avec le tronc coeliaque (TC) et ses branches. La présence d'une artère hépatique gauche naissant du TC impose de le conserver avec le greffon hépatique, le pancréas est prélevé avec l'AMS et l'artère splénique.

     

椎板开窗手术治疗腰椎间盘突出症108例分析

目的　探讨椎板开窗法摘除髓核治疗腰椎间盘突出症的可行性及其手术操作要点。方法　对10 8例腰椎间盘突出症行椎板开窗法摘除髓核术并对疗效作出评价。结果　采用椎板开窗法摘除髓核术治疗腰椎间盘突出症 ,疗效优良达 97%。结论　本术式具有操作简便、损伤小、出血少、病人恢复快等优点 ,值得临床推广。     

58例年轻恒牙外伤冠折的处理分析

目的：探究年轻恒牙外伤冠折的临床处理方法及效果。方法选择该院2009年3月—2014年9月口腔科门诊就诊年轻恒牙不同程度的外伤冠折的患者58例,依据不同临床表现分别给予直接盖髓术,活髓切断术,根尖诱导术治疗后对患牙进行随诊观察。结果治疗成功患牙52颗,占89%。结论对于年轻恒牙的外伤冠折,选择好正确的治疗方法,大多数患牙能保存牙髓活力,牙根能继续发育,永久性修复后患牙功能良好。     

短时受精不同脱颗粒细胞方式对体外受精结局的影响

目的探讨体外受精-胚胎移植（IVF-ET）治疗中几种短时受精脱颗粒细胞方式对胚胎质量及临床结局的影响。方法将261个IVF-ET周期根据脱颗粒细胞时间分为：短时受精后18小时脱颗粒细胞组（A组）94个周期、短时受精后5h脱颗粒细胞组（B组）95个周期和短时受精5h后部分（1/3-1/2）脱颗粒细胞组（C组）72个周期。分别比较三组的受精率、多精受精率、卵裂率、优胚率、胚胎利用率、临床妊娠率、种植率和流产率。结果三组的受精率、正常受精率、多精受精率、卵裂率、临床妊娠率和流产率差异无统计学意义（P〉0.05）,A组的优胚率、胚胎利用率和胚胎种植率显著高于B组（P〈0.05）。结论短时受精后即刻剥除部分卵子颗粒细胞观察第二极体,在确保受精的情况下剩余卵母细胞保留自体卵周颗粒细胞共培养,可以提高常规IVF的胚胎质量,从而提高常规IVF总的临床妊娠率和胚胎种植率。     

胚胎碎片对妊娠临床结局及去除后对胚胎发育的影晌

目的观察胚胎碎片对胚胎移植后的临床结局的影响,以及去除碎片对含碎片的胚胎发育影响。方法回顾性分析2012年新鲜IVF周期移植至少一个≥10％碎片的胚胎与移植完全无碎片胚胎临床结局,及2012年3月～5月IVF周期患者O／1PN优质胚胎,观察胚胎碎片去除组、胚胎碎片组及无碎片组的胚胎发育情况。结果含胚胎碎片组的临床妊娠率及种植率显著低于无碎片组,差异有显著性意义;去除碎片组与未去除碎片组的囊胚形成率与无碎片组,差异无显著性意义。结论胚胎碎片影响胚胎的种植;去除胚胎碎片不能显著改善胚胎的发育潜能。     

Effects of predrilling on the osseointegration potential of mini-implants

Objectives:To determine a reliable method of drilling a pilot hole when using a self-tapping surface-treated mini-implant and to evaluate stability after placement.Materials and Methods:Implant sites were predrilled in 12 rabbits with two devices: a conventional motor-driven handpiece and a newly developed hand drill. Mini-implants were then inserted in a complete random block design. Samples were divided into 1-week and 6-week groups to investigate osseointegration capacity in relation to the two time intervals. Mechanical and histomorphometric assessments were performed.Results:Mechanical analysis revealed no difference in maximum removal torque or total removal energy between the motor-driven predrilling group and the hand-drilling group. No difference was found between the 1-week group and the 6-week group. Histomorphometric evaluation showed no difference in the bone-implant contact (BIC) ratio or the bone volume (BV) area. For the time interval, a statistically significant increase in BIC and BV area was found in the 6-week group when compared to the 1-week group.Conclusions:The osseointegration potential of the motor-driven predrilling method was not different from that of the manual predrilling method with the newly developed hand drill. Hand drilling may be an attractive predrilling method in preference to the conventional motor-driven pilot drilling.     

Influence of the implant abutment types and the dynamic loading on initial screw loosening

PURPOSE

This study examined the effects of the abutment types and dynamic loading on the stability of implant prostheses with three types of implant abutments prepared using different fabrication methods by measuring removal torque both before and after dynamic loading.

MATERIALS AND METHODS

Three groups of abutments were produced using different types of fabrication methods; stock abutment, gold cast abutment, and CAD/CAM custom abutment. A customized jig was fabricated to apply the load at 30° to the long axis. The implant fixtures were fixed to the jig, and connected to the abutments with a 30 Ncm tightening torque. A sine curved dynamic load was applied for 10⁵ cycles between 25 and 250 N at 14 Hz. Removal torque before loading and after loading were evaluated. The SPSS was used for statistical analysis of the results. A Kruskal-Wallis test was performed to compare screw loosening between the abutment systems. A Wilcoxon signed-rank test was performed to compare screw loosening between before and after loading in each group (α=0.05).

RESULTS

Removal torque value before loading and after loading was the highest in stock abutment, which was then followed by gold cast abutment and CAD/CAM custom abutment, but there were no significant differences.

CONCLUSION

The abutment types did not have a significant influence on short term screw loosening. On the other hand, after 10⁵ cycles dynamic loading, CAD/CAM custom abutment affected the initial screw loosening, but stock abutment and gold cast abutment did not.