Amiodarone-induced experimental acute neuropathy in rats.

Amiodarone was injected endoneurially at increasing doses into the exposed tibial nerve of rats to study its electrophysiologic and pathologic effects on peripheral nerve fibers. Forty-five male Wistar rats were used, and each of the following concentrations was injected into 15 nerves: 25 micrograms/mL, 50 micrograms/mL, and 100 micrograms/mL. Microinjection of a 25 micrograms/mL concentration of amiodarone resulted in a subacute, incomplete conduction block evident at day 3 postinjection. This conduction block remained stable until day 10 and recovery was complete at day 35. Microinjection of a 50 micrograms/mL concentration of amiodarone produced a faster evolving conduction block, and significant axon degeneration (approximately 40% of fibers). Injection of a 100 micrograms/mL concentration resulted in severe acute motor axon degeneration followed by complete but delayed regeneration. Results of morphological studies closely correlated with electrophysiological findings. Amiodarone thus seems to have a direct toxic effect on axons at high concentrations in the peripheral nerve, and we suggest that different pathological changes described in human amiodarone neuropathy could be related to different concentrations of the drug in the nerve, perhaps due to variability of blood-nerve barrier efficacy.     

高原环境对部队适应人群内分泌系统的急性效应

本文对初入海拔5170米高原5日内未发生急性高山病的46名新战士进行了17项内分泌指标的检测,发现高原环境对适应人群内分泌系统的急性效应主要有:下丘脑一垂体应激反应增强;甲状腺功能增强;皮质醇分泌增多,醛固酮分泌减少,肾素活性降低,血管紧张素Ⅱ增多;性腺功能无明显变化。     

MEASUREMENT OF SURGICAL COSTS: A CLINICAL ANALYSIS

Because of reduced health care funding it is becoming necessary for surgeons to take a greater interest in the costs of individual operations. This study reports costs directly measurable to the patient, and also the indirect costs of hospital overheads, an operating suite and teaching, which were 37, 10 and 15%, respectively (62%), of hospital budget. A scheme has been developed which could give surgeons a standard to report direct costs. Pre-admission, ward, operating room, recovery, intensive care and post-admission are defined as cost periods and the modalities of staff, equipment (capital, maintenance and replacement), imaging, laboratory and consumables apply to each. This strategy was applied to assess open cholecystectomy (OC) and laparoscopic cholecystectomy (LC) as an example. The direct costs for OC were $3706 and LC $2868, a difference of $838; the indirect and direct costs were OC $6004 and LC $4646, a difference of $1358. Thus indirect cost magnified the difference between the operations. Bed stay, density of nursing and use of disposable instruments were the major influences on direct costs. The individual cost advantage of a shorter bed stay may be countervailed by an increased hospital activity. The main patient benefit of new operations may be improved quality of life and more rapid return to work with prevention of salary losses. A method has been developed to define costs of a particular surgical operation with the purpose of stimulating surgeons' interest in this topic and developing a common style of reporting. This method should help clinicians dealing with hospital finances and waiting lists. Indirect costs are a hidden substantial cost of surgery. Considerably more attention needs to be paid to indirect costs in controlling surgical budgets.     

Multicentre prospective audit of surgical outcomes and acute complications following short course pre-operative radiotherapy for resectable rectal cancer

BACKGROUND: The addition of short course pre-operative radiotherapy to total mesorectal excision reduces local recurrence in resectable adenocarcinoma of the rectum. In a previous retrospective study potential factors associated with early complications following this combination were identified. The aim of this study was to examine these relationships in a prospective multicentre audit. METHODS: One hundred and seven patients who received short course pre-operative radiotherapy in four cancer centres between 1 October 2001 and 30 September 2002 were included. Data including patient age, radiotherapy field length, overall treatment time, operation type, surgical outcomes and complications occurring within 3 months of the 1st day of radiotherapy were collected. These were compared and combined with the previously studied cohort of 176 patients treated at one centre between 1st January 1998 and 31st December 1999. RESULTS: In the prospective cohort only patient age (P=0.001) was significantly associated with acute complications. However, both the overall treatment time (median 9.0 vs 11.0 days P <0.0001) and field length (median 16.6 vs 17.0 cm P=0.03) were significantly shorter in this cohort when compared to the previous retrospective study. In patients from both studies (n=283), increasing age (P=0.002) and field length (independent of operation type) (P=0.02) were independently associated with an increased risk of acute complications. CONCLUSIONS: This study suggests that meticulous selection of patients for short course pre-operative radiotherapy and smaller planning target volumes may be associated with a lower risk of acute complications. The use of MRI scanning to stage pelvic disease may reduce the number of patients with R1 resections receiving short course pre-operative radiotherapy.     

极低体重儿药物性急性肾功能衰竭12例报告

[背景 ]探讨极低体重儿药物性急性肾功能衰竭的发生原因及预后 .[病例报告 ]对 12例极低体重儿使用甲灭酸后发生的急性肾功能衰竭进行了分析 ,发现每次使用该药 2mg/kg ,使用 1 9次±0 6次 ,3 7h± 3 0h后发生肾功能衰竭 .肾功能衰竭时 ,患儿钾、尿素氮、尿量与肾功能衰竭纠正后相比差异有显著性 ,而钠、钙及肌酐则无显著性差异 .纠正肾功能衰竭的时间为 6日± 3日 ,其中 10例的肾功能恢复正常 ,2例死亡 .[讨论 ]极低体重儿使用前列腺素抑制剂可引起暂时性肾功能衰竭     

重型颅脑损伤开颅术中急性脑膨出的防治

目的探讨重型颅脑损伤开颅术中急性脑膨出的原因及对策。方法对120例重型颅脑损伤开颅术中急性脑膨出的原因、对策及预后进行回顾性分析。结果（1）迟发血肿65例，其中同侧脑内血肿10例，硬膜外血肿8例，对侧硬膜外血肿21例，硬膜下血肿10例，脑内血肿9例，大脑纵裂血肿7例；（2）急性弥漫性脑肿胀40例；（3）外伤性大面积脑梗死15例；（4）复合伤患者有30例。合并胸部、腹部及四肢骨折，有明显的低血压和低血氧症状；（5）术中操作不当，误诊误治10例。结论重型颅脑损伤开颅术中急性脑膨出的主要原因有迟发性颅内血肿，弥漫性脑肿胀，严重脑水肿，广泛脑梗死，术中操作不当，对病情的误诊误治，麻醉问题等。根据不同的原因进行正确处理，可以降低急性脑膨出的重残率及病死率。     

十二指肠镜下逆行胆胰管造影及取石并发急性胰腺炎6例分析

目的探讨十二指肠镜下逆行胆胰管造影(ERCP)及取石(EST)引发急性胰腺炎的防治方法。方法对该院已行ERCP和EST的42例患者的临床资料进行回顾性分析。结果6例术后并发急性胰腺炎，其中1例死亡。结论ERCP和EST引发急性胰腺炎，主要有两种情况，一是化学刺激引发急性胰腺炎；另一方面为共同通道受阻引发急性胰腺炎，只有在操作中认真防范，术后仔细观察、处理，该并发症是可以防治的。