TENG HSIANG WEI
Projetos de Pesquisa
Unidades Organizacionais
Instituto de Ortopedia e Traumatologia, Hospital das Clínicas, Faculdade de Medicina
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
12 resultados
Resultados de Busca
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- Comparative Analysis of the Treatment of Skin Lesions of the Lower Limbs with Sural Flap versus Propeller Flap(2022) TENEZACA, Katherine V.; SILVA, Gustavo Bersani; IAMAGUCHI, Raquel Bernardelli; REZENDE, Marcelo Rosa de; WEI, Teng Hsiang; CHO, Álvaro B.Abstract Objective The objective of the present study was to prospectively compare the sural and propeller flaps for soft-tissues coverage of the lower extremity. The following variables were evaluated: incidence of complete or partial flap loss and donor area morbidity (primary closure versus skin graft). Methods Prospective and randomized analysis of data collected from all patients presenting with soft tissue defects of the lower third of the leg and heel treated with reverse sural or propeller flaps. Results Twenty-four patients aged between 4 and 60 years old were evaluated between 2011 and 2017. Complete coverage was obtained in 22 of the 24 patients (91.6%). Two flaps failed (8.4%). The sural flap, being the most popular option, continues to represent a safe and versatile alternative for skin defects of the lower third of the leg and heel region. Likewise, the propeller flap was a comparable option to treat these challenging defects. Conclusion Sural and propeller flaps are good options for soft tissues coverage of the lower extremity, with low complication rates (partial or total flap loss).
- Do two venous anastomoses decrease venous thrombosis during limb reconstruction?(2019) IAMAGUCHI, Raquel; BURGOS, Felipe; SILVA, Gustavo; CHO, Alvaro; NAKAMOTO, Hugo; TAKEMURA, Renan; WEI, Teng; REZENDE, Marcelo de; JR, Rames MattarBACKGROUND: The optimal number of veins to be anastomosed in perforator flaps for limb reconstruction and its influence on the results remain controversial. Venous thrombosis of microvascular anastomoses is a commonly recorded complication in soft tissue reconstruction. OBJECTIVE: To evaluate the effect of two venous anastomoses in the incidence of venous thrombosis for limb reconstruction using anterolateral thigh (ALT) microsurgical free flaps. METHODS: This was a cross-sectional study on patients undergoing limb reconstruction using ALT flap during 2014-2017. Perioperative information was recorded and patients were divided in two groups: group 1 (one venous anastomosis; 17 patients) and group 2 (two venous anastomoses; 21 patients). Complications were investigated. RESULTS: Overall, 38 microsurgical flaps were included. The mean age was 33 years, and 32 patients were male. The most prevalent wounds were traumatic. Group 1 presented a higher complication rate than group 2 (47% vs. 24%; p = 0.065), although the difference was not significant. Group 1 presented a higher rate of venous anastomotic thrombosis (p = 0.032) than group 2. The overall success rate was 92%. CONCLUSION: For limb reconstruction using ALT microsurgical free flaps, two venous anastomoses are associated with a low rate of venous thrombosis in microvascular anastomoses.
- Comparison between donor nerves to motorize the free functional gracilis muscle transfer for elbow flexion: Retrospective study of 38 consecutive cases in traumatic adult brachial plexus injuries(2019) CHO, Alvaro B.; SILVA, Gustavo Bersani; PISANI, Marina J.; ALVES, Jairo A.; IAMAGUCHI, Raquel B.; WEI, Teng H.; REZENDE, Marcelo R. dePurpose Elbow flexion deficit is a frequent problem in traumatic brachial plexus injuries and reestablishment of this function is the primary treatment goal. When management is delayed, or the initial acute approach fails, free functional transfer of the gracilis muscle for elbow flexion is the treatment of choice. In this report, the authors present the results of a comparison study on different donor nerves (spinal accessory and ulnar) in elbow flexion reconstruction with gracilis flap for traumatic adult brachial plexus injuries. Methods Retrospective analysis of patients with both total or partial traumatic brachial plexus injuries was carried out. Of the 38 patients enrolled, 37 were male (97.4%) with a mean age of 28.3 years. The mean follow-up period was 25 months. Postoperative function of the gracilis muscle flap was recorded and patients were divided into two groups according to donor nerve: spinal accessory nerve (SAN) (18 cases), and motor fascicles of the ulnar (ULNAR) (20 cases). Results Twenty-six cases obtained elbow flexion strength M3 or M4 (68.4%): 0 M0 (0.0%), 4 M1 (10.5%), 8 M2 (21.1%), 9 M3 (23.7%) and 17 M4 (44.7%). The mean interval to first recorded M3 muscular strength was 12.4 months. Functional elbow flexion strength (>= M3) had the following distribution: SAN 83.3% (15/18) and ULNAR 55.0% (11/20) (p = .086). Conclusion No statistical difference for final muscle strength was found between donor nerve groups.
- Do technical components of microanastomoses influence the functional outcome of free gracilis muscle transfer for elbow flexion in traumatic brachial plexus injury?(2021) MARTINS-FILHO, Francisco Vilmar Felix; IWASE, Fernanda do Carmo; SILVA, Gustavo Bersani; CHO, Alvaro Baik; WEI, Teng Hsiang; REZENDE, Marcelo Rosa de; JR, Rames Mattar; IAMAGUCHI, Raquel BernardelliIntroduction: The traumatic lesions of the brachial plexus in adults are devastating injuries causing continuous severe functional impairment for both work and daily living activities. The restoration of elbow flexion is one of the most important movements for patient recovery to previous activities. Free gracilis muscle transfer has good outcomes for cases with late presentation or as a rescue surgery to regain elbow flexion, however, bad results are present in all cohorts with insufficient recovery of muscle strength for elbow flexion. A number of hypotheses can be postulate to explain the fair results observed in some cases of free gracilis muscle transfer for elbow flexion. Most studies in the current literature compare the choice of the donor nerve used in neurotization and nerve grafts. The aim of this study is to evaluate if technical components of microvascular anastomosis could influence the functional outcome of free functional muscle transfer for elbow flexion in adult patients with traumatic brachial plexus injury. Material and methods: Included all adult patients with traumatic brachial plexus injury submitted to free functional gracilis muscle transfer for elbow flexion. The complications and functional results according to British Medical Research Council (BMRC) score were recorded. Results: We assessed 26 patients with mean age of 32.8 years. The most common donor nerve for gracilis muscle was the accessory nerve in 18 patients. Eighteen patients presented with good result (M3/M4). The mean ischemia time was higher for patients with bad results (132 minutes) comparing with patients with good results (122 minutes). Patients with only one venous anastomosis had 41% of poor functional outcome compared with 22% of cases with two venous anastomoses. No statistically significant difference in the ischemia time of the cases with good or poor functional outcome was observed (p = 0.657), as for the number of venous anastomoses (p = 0.418). Conclusion: Our study observes that patients with only one venous anastomoses for drainage of free gracilis and those with longer intraoperative ischemia time had higher incidence of poor functional outcome of free gracilis muscle transfer for elbow flexion, but not statistically significant. Level of proof: II; prospective cross-sectional study.
- GRACILIS MUSCLE TRANSFER TO ELBOW FLEXION IN BRACHIAL PLEXUS INJURIES(2020) SILVA, Gustavo Bersani; LIMA NETO, Mauricio Rodrigues; CHO, Alvaro Baik; IAMAGUCHI, Raquel Bernardelli; RESENDE, Marcelo Rosa de; WEI, Teng HsiangObjective: Brachial plexus injury can lead to significant functional deficit for the patient. Elbow flexion restoration is a priority in surgical treatment. Free functional muscle transfer is an option for early or late treatment failure. This study evaluated patient characteristics and elbow flexion muscle strength after gracilis functioning muscle transfer. Methods: Medical records of 95 patients operated from 2003 to 2019 were analyzed and the following variables recorded: age, gender, nerve transfer used to motorize the gracilis muscle, time between trauma and surgery, age at surgery and elbow flexion strength after a minimum of 12 months following functioning muscle transfer. Results: 87 patients were included, averaging 30 years of age (17 to 57 years). Fifty-five achieved elbow flexion muscle strength >= M3 (55/87, 65%), with a mean follow-up of 37 months. The nerves used for activation of the transferred gracilis were: 45 spinal accessory, 10 intercostal, 8 median n. fascicles, 22 ulnar n. fascicles and 2 phrenic nerves. Conclusion: Functional muscle transfer is a viable surgical procedure for elbow flexion in chronic traumatic brachial plexus injuries in adults.
- Computed tomography angiography and microsurgical flaps for traumatic wounds: What is the added value?(2021) MACEDO, Lucas Sousa; RUSIG, Renato Polese; SILVA, Gustavo Bersani; CHO, Alvaro Baik; WEI, Teng Hsiang; IAMAGUCHI, Raquel BernardelliBACKGROUND: Microsurgical flaps are widely used to treat complex traumatic wounds of upper and lower limbs. Few studies have evaluated whether the vascular changes in preoperative computed tomography angiography (CTA) influence the selection of recipient vessel and type of anastomosis and the microsurgical flaps outcomes including complications. OBJECTIVE: The aim of this study was to evaluate if preoperative CTA reduces the occurrence of major complications (revision of the anastomosis, partial or total flap failure, and amputation) of the flaps in upper and lower limb trauma, and to describe and analyze the vascular lesions of the group with CTA and its relationship with complications. METHODS: A retrospective cohort study was undertaken with all 121 consecutive patients submitted to microsurgical flaps for traumatic lower and upper limb, from 2014 to 2020. Patients were divided into two groups: patients with preoperative CTA (CTA+) and patients not submitted to CTA (CTA-). The presence of postoperative complications was assessed and, within CTA+, we also analyzed the number of patent arteries on CTA and described the arterial lesions. RESULTS: Of the 121 flaps evaluated (84 in the lower limb and 37 in the upper limb), 64 patients underwent preoperative CTA. In the CTA+ group, 56% of patients with free flaps for lower limb had complete occlusion of one artery. CTA+ patients had a higher rate of complications (p = 0.031), which may represent a selection bias as the most complex limb injuries and may have CTA indicated more frequently. The highest rate of complications was observed in chronic cases (p = 0.034). There was no statistically significant difference in complications in patients with preoperative vascular injury or the number of patent arteries. CONCLUSIONS: CTA should not be performed routinely, however, CTA may help in surgical planning, especially in complex cases of high-energy and chronic cases, since it provides information on the best recipient artery and the adequate level to perform the microanastomosis, outside the lesion area.
- INTERCOSTAL NERVE TRANSFER TO THE BICEPS MOTOR BRANCH IN COMPLETE TRAUMATIC BRACHIAL PLEXUS INJURIES(2015) BAIK, Alvaro; IAMAGUCHI, Raquel Bernardelli; SILVA, Gustavo Bersani; PAULOS, Renata Gregorio; KIYOHARA, Leandro Yoshinobu; SORRENTI, Luiz; MENEZES, Klicia de Oliveira Costa Riker Teles de; REZENDE, Marcelo Rosa de; WEI, Teng Hsiang; MATTAR JUNIOR, RamesThe purpose of this report is to critically evaluate our results of two intercostal nerve transfers directly to the biceps motor branch in complete traumatic brachial plexus injuries. From January 2007 to November 2012, 19 patients were submitted to this type of surgery, but only 15 of them had a follow-up for >= 2 years and were included in this report. The mean interval from trauma to surgery was 6.88 months (ranging from 3 to 9 months). Two intercostals nerves were dissected and transferred directly to the biceps motor branch. The mean follow-up was 38.06 months (ranging from 24 to 62 months). Ten patients (66.6%) recovered an elbow flexion strength >= M3. Four of them (26.66%) recovered a stronger elbow flexion >= M4. One patient (6.25%) recovered an M2 elbow flexion and four patients (26.66%) did not regain any movement. We concluded that two intercostal nerve transfers to the biceps motor branch is a procedure with moderate results regarding elbow flexion recovery, but it is still one of the few options available in complete brachial plexus injuries, especially in five roots avulsion scenario. (C) 2015 Wiley Periodicals, Inc.
- A REINFORCEMENT OF THE SUTURED MICROVASCULAR ANASTOMOSIS WITH FIBRIN GLUE APPLICATION: A RETROSPECTIVE COMPARATIVE STUDY WITH THE STANDARD CONVENTIONAL TECHNIQUE(2017) CHO, Alvaro Baik; PAULOS, Renata Gregorio; BERSANI, Gustavo; IAMAGUCHI, Raquel Bernardelli; TORRES, Luciano Ruiz; WEI, Teng Hsiang; RESENDE, Marcelo Rosa De; MATTAR JUNIOR, RamesPurpose: Although a reasonable number of studies report satisfactory results with fibrin glue application in microvascular anastomosis since 1977, its utilization in the clinical setting has being scant in the literature. The aim of this study was to report the cumulated experience with the fibrin glue in free flaps over a period of 10 years, comparing the survival rate with the standard sutured anastomosis. Patients and methods: From August 2001 through November 2014, 83 consecutive free flaps were performed by a team of surgeons from two hospitals. About 56 flaps were performed in 56 patients using the fibrin glue augmented microvascular anastomosis and 27 flaps were performed in 27 patients using the conventional anastomosis technique. The decision on whether or not the fibrin glue should be used at the anastomoses was based on its availability and whose surgeon was performing the anastomoses. About approximately 60% of sutures stitches were used that would be used in a conventional anastomosis, when fibrin glue application was anticipated (ranging from 5 to 7 sutures in the arteries and 5 to 8 in the veins). Results: The overall survival rate of the flaps performed with fibrin glue application was 92.85%. In one case, a revision of the venous anastomosis was required due to early flap congestion. Four cases (7.14%) had failure of the first free flap and two of them were submitted to another free flap without fibrin glue application. In the flaps performed with the conventional anastomosis technique the survival rate was 92.59%. This difference was not statistically significant (P=0.97). Conclusion: The application of fibrin glue in microvascular anastomoses did not increase the rate of flap loss and had a potential to reduce the number of sutures required to complete an anastomosis by its sealing effect. (C) 2016 Wiley Periodicals, Inc.
- Peri-operative risk factors for complications of free flaps in traumatic wounds - a cross-sectional study(2018) IAMAGUCHI, Raquel Bernardelli; TAKEMURA, Renan Lyuji; SILVA, Gustavo Bersani; ALVES, Jairo Andre de Oliveira; TORRES, Luciano Ruiz; CHO, Alvaro Baik; WEI, Teng Hsiang; REZENDE, Marcelo Rosa de; MATTAR JR., RamesIntroduction Indication of free tissue transfer for limb reconstruction continues to grow, and despite the good results with this treatment option, complications can impair the functional results and cause a raise in health costs, with prolonged hospitalization. Therefore, peri-operative surgical information and comorbidities were described and analyzed, for identification of independent risk factors for complications of free flaps results for traumatic wounds. For our knowledge, intraoperative ischemia time of free flap was not previously studied for post-traumatic limb reconstruction, which could influence results, in these traumatic cases, with the highest rates of complications among microsurgical flap reconstructions. Methods From July 2014 to January 2017, all patients with free flaps for limb reconstruction were consecutively included. Data on personal medical history, intra-operative microsurgical procedure, and laboratory tests were collected and complications analyzed. Descriptive and inferential statistics were performed. Results Sixty-two free flaps for traumatic limb reconstruction in 60 patients were studied. We observed a higher rate of complications in patients who underwent surgery > seven days after the trauma, patients with obesity, when used recipient veins from the superficial system for drainage of the flap, and in those in whom the ischemia time of the free flap was higher in univariate analyzes. After logistic regression, the remaining independent risk factors for complications were ischemia time of free flap > two hours and obesity. The presence of thrombocytosis was associated with partial flap loss. Conclusions The independent risk factors for complications were ischemia time of free flap > two hours and obesity.
- IS OBESITY A RISK FACTOR FOR FREE VASCULARIZED FIBULAR FLAP COMPLICATIONS?(2019) IAMAGUCHI, Raquel Bernardelli; MORAES, Marco Aurelio de; SILVA, Gustavo Bersani; CHO, Alvaro Baik; IWASE, Fernanda do Carmo; WEI, Teng Hsiang; REZENDE, Marcelo Rosa de; MATTAR JR., RamesObjective: Although our knowledge of bone reconstruction through microsurgery has increased, the vascularized fibula flap remains one of the most difficult free flap reconstructions to perform, and complications remain a challenge. The incidence of obesity is increasing and is associated with higher rates of free flap complications, which can lead to disastrous results. Since there is no consensus in literature regarding the influence of obesity on free flap outcomes in orthopedic surgeries that require segmental bone reconstruction, the objective of this study was to determine whether obesity increases the risk of post-operative complications (Clavien-Dindo grade III) after free vascularized fibular flap surgery. Methods: A cohort study was conducted in all patients undergoing free flap limb reconstructions between July 2014 and July 2018. Patients were separated in two groups based on their body mass index (BM I): non-obese and obese (BMI >= 30 kg/m(2)). Results: Twenty-three free vascularized fibular flaps were studied. The indications included trauma in 13, tumors in 7, and congenital pseudarthrosis of the tibia in 3. Obese patients were associated with an increase in surgical complications (p=0.038). During the final follow-up, consolidation was obtained in 17 patients (74%). Conclusion: Obesity is a risk factor for complications in free vascularized fibular flap surgery.