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find Author "张凯" 23 results
  • Efficacy and predictive factors analysis of vagus nerve stimulation in patients with refractory MRI-negative epilepsy

    ObjectiveTo investigate the efficacy of vagus nerve stimulation (VNS) in patients with refractory magnetic resonance imaging (MRI)-negative epilepsy and to evaluate potential clinical predictors. MethodsA retrospective collection of efficacy data was conducted on 24 patients with intractable MRI-negative epilepsy treated with VNS, who were followed up for more than six months, at Beijing Tiantan Hospital and Beijing Fengtai Hospital from January 2016 to September 2023. Patients were divided into two subgroups based on their response to VNS: responders (≥50% reduction in seizure frequency) and non-responders (<50% reduction in seizure frequency). The relationship between preoperative clinical data and VNS efficacy was further analyzed to identify potential predictors of VNS efficacy. ResultsA total of 24 patients were included, with an average age of (14.26±8.39) years old. Seizure frequency was reduced by more than 50% in 37.5% of patients, and 8.3% of patients achieved seizure-free after VNS treatment. Preoperative seizure frequency and interictal epileptiform discharge type were significantly associated with VNS efficacy (P<0.05). Multivariate regression analysis showed that a monthly seizure frequency of less than 100 and focal interictal epileptiform discharges were independent predictors of VNS efficacy (P<0.05). ConclusionVNS is an effective treatment for patients with refractory MRI-negative epilepsy. Lower monthly seizure frequency and focal interictal epileptiform discharges are potential predictors of VNS efficacy. These findings provide important references for clinicians in selecting and evaluating patients for VNS treatment.

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  • APPLIED ANATOMY OF SUPERFICIAL INFERIOR EPIGASTRIC ARTERY FLAP

    Objective To provide the anatomical basis for the appl ication of the superficial inferior epigastric artery flap. Methods Ten cadavers which were immersed in formal in less than 6 months and were perfused by red latex were used in this study. There were 8 males and 2 females with an average age of 58 years (range, 35-78 years). The origin, course, branch,distribution, diameter, pedicle length, and neighbour of superficial inferior epigastric artery and vein were observed in the 2 sides of inguinal region. Results In these series of 10 cadaver (20 sides) dissections, the superficial inferior epigastric artery was identified in 18 sides, which average cal iber was 1.48 mm with a mean vascular pedicle length of 4.80 cm. In 11 sides, the superficial inferior epigastric artery arose aspart of a common trunk with one or more other vessels; in other 7, it originated from the femoral. There were 4 branch modes of superficial inperior epigastric artery: single trunks (5 sides), double ramification (3 sides), single lateral ramification (7 sides), and single medial ramification (3 sides). The superficial inferior epigastric vein was observed in 20 sides, which average cal iber was 2.33 mm with a mean sides pedicle length of 5.45 cm. In 8 sides, the venous drainage was as an individual vein; in 12 sides, both patterns were observed (a pair of venae comitantes and an individual vein). Conclusion The inferior epigastric artery flap can be appl ied to microsurgical flap transfer, potentially in breast reconstruction, phalloplasty, reconstruction of head, neck and four l imbs defects.

    Release date:2016-09-01 09:04 Export PDF Favorites Scan
  • LOOP MUSCULOPLASTY IN THE TREATMENT OF INCOMPETENCE OF DEEP VEIN OF LOWER EXTREMITY

    The tendons of semitendinosus and biceps femoris were transposed in front of the popliteal vein in a "U" shaped loop with the purpose to impede the venous back-flow. This type of operation was used in 10 cases with the aim to treat incompetence of deep vein of the lower extremity. Following the operation, patients were under clinical observation and undertaken retrograde venographie examination. It was proved that the results after operation were satisfactory with the disapperance of symptoms and subsequent healing of ulcers.

    Release date:2016-09-01 11:34 Export PDF Favorites Scan
  • Study on the Feasibility of Brain CT Perfusion with 70 kV Tube Voltage

    ObjectiveTo investigate the influence of 70 kV low-dose CT perfusion technique on brain CT perfusion parameter maps and image quality. MethodsRetrospective analysis of all patients who underwent CT perfusion of brain between October 2013 and February 2014 was carried out. The patients were randomly divided into two groups according to diTherent CT examination dose: group A (80 kV, 200 mAs) and group B (70 kV, 200 mAs). All patients were scanned on a dual-source-CT (Siemens Definition Flash). Fifteen normal subjects without brain diseases in each group were selected to be studied. Region of interest (ROI) with an area of 80 mm2 was placed in the nucleus, putamen, thalamus, periventricular white matter of the frontal lobe and temporo-occipital area, and the parameters in the ROI including cerebral blood flow, cerebral blood volume, mean transit time and time to peak were detected. The carrierto-noise ratio and signal-to-noise ratio of thalamus and periventricular white matter of the frontal lobe were contrasted. The image quality of perfusion was assessed by two senior radiologists using 5 point system for blind assessment (5=best, 1=worst). The measurement of radiation dose was studied through effective dose, volume CT dose index (CTDIVOL) and dose length product (DLP). Statistical analysis was performed by independent sample t test. ResultsThere was no significant difference between group A and group B in brain CT perfusion parameters (P>0.05). There was no significant diTherence in image quality between the two groups in the objective and subjective assessment (P>0.05). In comparison with group A, the measured effective dose, CTDIVOL and DLP for group B decreased by 35%. ConclusionThere was no significant influence on the brain CT perfusion parameters and image quality using 70 kV tube voltage, and radiation dose is decreased obviously.

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  • Efficacy and Safety of Telbivudine Combined with Adefovir Dipivoxil for Chronic Hepatitis B: A Systematic Review

    ObjectiveTo evaluate the clinical efficacy and safety of telbivudine (TEV) combined with adefovir dipivoxil (ADV) for chronic hepatitis B (CHB), so as to provide references for clinical practice and research. MethodsWe electronically searched databases including The Cochrane Library (Issue 7, 2013), PubMed, EMbase, Web of Science, CBM, CNKI, VIP, and WanFang Data from inception to August 21st, 2013, for the relevant randomized controlled trials (RCTs). Other sources were also retrieved. Two reviewers independently screened literature according to the inclusion and exclusion criteria, extracted data, and assessed the quality of included studies. Then, meta-analysis was performed using RevMan 5.1 software. ResultsA Total of 11 RCTs involving 1 010 patients were included. The trial group were given TEV combined with ADV, while the control group were given TEV alone or ADV alone. The results of metaanalysis showed that, the combined use was superior to TEV alone or ADV alone in improving HBV-DNA negative rates at 12-, 24-, 48-weeks, HBeAg negative rates at 12-, 24-, 48-weeks, and ALT recovery rates at 12-, 24-weeks (P < 0.05). The results of qualitative analysis showed that, the trial group had a lower drug resistance rate, and both were alike in the incidence of adverse reaction. ConclusionCompared with TEV alone or ADV alone, TEV combined with ADV could improve the clinical efficacy of treating CHB which is also fairly safe. Due to the limited quantity and quality of the included studies, the aforementioned conclusion still needs to be further verified by conducting more large-scale and high quality RCTs.

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  • Application of folded transverse superficial epigastric artery perforator flap for large penetrating defect after buccal carcinoma resection

    Objective To explore the effectiveness of folded transverse superficial epigastric artery perforator flap in repairing the large penetrating defect after buccal carcinoma resection. Methods Between January 2019 and June 2021, 12 patients with buccal squamous cell carcinoma were treated. There were 6 males and 6 females with an average of 66.9 years (range, 53-79 years). The pathological stage was T3a-T4b, and the preoperative mouth opening was (3.08±0.46) cm. The disease duration ranged from 6 to 24 months, with an average of 15 months. After buccal carcinoma radical resection and neck lymph node dissection, the penetrating defects in size of 8 cm×6 cm to 16 cm×8 cm and in depth of 0.5-1.5 cm were remained. The transverse superficial epigastric artery perforator flap in size of 8 cm×6 cm to 14 cm×8 cm were harvested and folded to repair the penetrating defects. The donor site was sutured directly. Results All 12 skin flaps survived after operation, and the wounds healed by first intention. No internal or external fistula complications occurred. All incisions at the recipient site healed by first intention. All patients were followed up 12-18 months (mean, 14 months). There was no obvious abnormality in the color and texture of the flap, the oral and facial appearances were symmetrical, and there was no obvious swelling in the cheek. At last follow-up, the patient’s mouth opening was (2.89±0.33) cm, which was not significantly different from that before operation (t=1.879, P=0.087). The subjective satisfaction scores of 12 patients were 6-8 points, with an average of 7.3 points. Significant scars remained at the donor site but concealed in location. Conclusion The folded transverse superficial epigastric artery perforator flap can be used as a surgical method for repairing large penetrating defects after the buccal carcinoma resection, with a good recovery of facial appearance and oral function.

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  • Research advance in polyaryletherketones for biomedical applications

    With high thermal stability, excellent mechanical properties, suitable biocompatibility and radiolucency, polyaryletherketones (PAEKs) have been widely used in biomedical field such as trauma, spinal implants, craniomaxillofacial repair and so on. However, PAEKs are bio-inert in nature and often show weak osteointegration with host bone, limiting their further utilization in biomedical application. Therefore, how to improve the bioactivity and osteointegration of PAEK implants has become the focus in biomedical field. This paper reviews the current research advance and some existed problems in bioactive PAEKs, and outlooks the possible solution.

    Release date:2018-09-25 02:22 Export PDF Favorites Scan
  • 磁共振引导下激光间质热疗术治疗药物难治性癫痫的操作规范

    激光间质热疗术(Laser interstitial thermal therapy,LITT)由Bown于1983年首次描述, 1990年Sugiyama首次使用该术式治疗脑部病变,美国食品药品监督管理局(Food and Drug Administration,FDA)于2007年批准了LITT治疗颅内疾病,Curry等于2012年报道了磁共振引导下激光间质热疗术(MRI-guided laser interstitial thermal therapy,MgLITT)治疗癫痫。此后,MgLITT治疗癫痫得到了迅速的发展。来自论文的数据统计显示,世界范围内共有1800多例癫痫患者接受了MgLITT手术,涉及的病理包括下丘脑错构瘤(Hypothalamic hamartoma,HH)、颞叶内侧硬化、局灶性皮质发育不良(Focal cortical dysplasia,FCD)、各种发育性肿瘤、海绵状血管畸形等。依据诸多文献报道的结果,MgLITT治疗多种病理所致癫痫的疗效不劣于传统的开颅切除性手术,并以安全、准确、微创的优势,在未来可能改变癫痫外科的手术模式。目前已上市的MgLITT设备包括美国Medtronic公司的Visualase系统和加拿大Monteris公司的NeuroBlate系统,我国的Sinovation公司于2020年研制出国产MgLITT系统,同年完成动物实验并开始了上市前的临床试验。2020年8月12日北京天坛医院率先开展了MgLITT治疗一例颞叶内侧癫痫,截止到2022年5月,已完成230例MgLITT治疗不同病理类型癫痫的手术,初步积累了相关的经验。清华大学玉泉医院于2020年11月开始开展MgLITT治疗难治性癫痫患者,证实在非术中磁共振条件下也可安全有效的开展MgLITT治疗。中国抗癫痫协会谭启富基金管理委员会委托北京天坛医院和清华大学玉泉医院相关人员撰写MgLITT手术操作规范,从术前患者筛选、手术流程和术后管理等方面分别介绍,旨在助力于这一技术未来在中国的规范开展。

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  • 腘窝原始神经外胚叶肿瘤一例报告

    Release date:2016-08-31 04:07 Export PDF Favorites Scan
  • EARLY EFFECTIVENESS OF COMBINING RADIAL FOREARM FREE FLAP AND ADJACENT TISSUE FLAP IN RECONSTRUCTION OF PALATOMAXILLARY DEFECTS

    Objective To investigate the method of combining radial forearm free flap and adjacent tissue flap in reconstruction of palatomaxillary defects and its effectiveness. Methods Between March 2005 and May 2010, 17 patients with palatomaxillary defects were treated. There were 11 males and 6 females with an age range of 45-74 years (mean, 62.5 years), including 1 case of benign tumor and 16 cases of malignant tumors (7 cases of squamous cell carcinoma of palate, 1 case of recurring squamous cell carcinoma of palate, 1 case of malignant melanoma of palate, 1 case of adenoid cystic carcinoma of palate, 1 case of malignant melanoma of maxilla, 1 case of ductal carcinoma of maxilla, and 4 cases of squamous cell carcinoma of maxilla). The maxillectomy defect ranged from 7.0 cm × 5.5 cm to 10.0 cm × 7.5 cm. According to Brown’s classification for the maxillectomy defect, there were type II in 15 cases, type III in 2 cases. Palatomaxillary defects were repaired with radial forearm free flap and buccal fat pad in 11 cases, and with radial forearm free flap, buccal fat pad, and mandibular osteomuscular flap pedicled with temporal muscle in 6 cases. The effectiveness was evaluated after operation by observing the vitality of the flap, the functions of speech, swallowing, breath, and the facial appearance. Results All cases were followed up 6-12 months without tumor recurrence. All flaps and skin grafts at donor sites survived. The functions of seech, swallowing, and breath were normal without obvious opening limitation. The facial appearance was satisfactory without obvious maxillofacial deformity. No enophthalmos occurred in patients with orbital floor and infraorbital rim defects. The patients had no oronasal fistula with satisfactory oral and nasal functions. Conclusion According to the type of palatomaxillary defects, it can have good early effectiveness to select combining radial forearm free flap and buccal fat pad or combining radial forearm free flap, buccal fat pad, and mandibular osteomuscular flap for repairing defects.

    Release date:2016-08-31 05:45 Export PDF Favorites Scan
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