HUGO ALBERTO NAKAMOTO

(Fonte: Lattes)
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Lattes
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Instituto de Ortopedia e Traumatologia, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/41 - Laboratório de Investigação Médica do Sistema Músculoesquelético, Hospital das Clínicas, Faculdade de Medicina
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina

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Agora exibindo 1 - 10 de 28
  • article 3 Citação(ões) na Scopus
    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 Mattar
    BACKGROUND: 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.
  • article 2 Citação(ões) na Scopus
    Evaluation of the Use of Nerve Allograft Preserved in Glycerol
    (2021) NAKAMOTO, Joao Carlos; WATAYA, Erick Yoshio; NAKAMOTO, Hugo Alberto; SANTOS, Gustavo Bispo; RIBARIC, Ivan; HERRERA, Ana K. A.; FARIA, Jose C. M.
    Background: We aimed to evaluate the use of nerve allograft preserved in glycerol. We compared the efficiency of glycerol-preserved allografts with autogenous nerve grafting, cryopreserved grafts, and detergent-processed grafts in the axonal regeneration. Secondarily, we evaluated the effectiveness of each preservation method in maintaining the extracellular matrix free of cellular components. Methods: This was a prospective experimental, longitudinal, unblinded, nonrandomized, controlled animal model study. Three different allograft preservation techniques for the repair of sciatic nerve injuries were compared, including cold preservation, glycerol preservation, and detergent preservation. Functional assessment was performed, and histomorphometric analyses were further performed, which enabled the allograft structure evaluation and an estimation of the nerve regeneration efficacy based on the myelinated axons count and on their diameters. Results: After the 14(th) week, all groups were already balanced and similar (P = 0.265): all groups present near-zero SFIs, thus confirming their efficiency in promoting nerve regeneration. In the histomorphometric evaluations, all groups were equivalent, presenting a similar efficiency in nerve regeneration (P = 0.716 and P = 0.577, respectively). Similarly, histomorphometric evaluations showed a reduction in the number of axons and in their diameters, but none of them effectively eliminated all cellular debris. Comparing the groups with each other, the groups preserved in glycerol and detergent solution were similar, both presenting better results than the cooled group. Conclusion: By evaluating the presence of cell debris after the treatment using glycerol, it was found to be similar to the treatment using detergent and significantly better than the cold-preservation treatment.
  • article 4 Citação(ões) na Scopus
    Comparative analysis of scaphoid nonunion treatment with screw fixation and angular stable plate
    (2023) NAKAMOTO, Joao Carlos; XAVIER, Renato Martins; BURGOS, Felipe Hellmeister; WATAYA, Erick Yoshio; IWASE, Fernanda do Carmo; NAKAMOTO, Hugo Alberto; MATTAR JUNIOR, Rames
    Introduction Scaphoid fractures represent 5-10% of nonunion rate and the treatment options consist of an open reduction with correction of deformity, restoration of the scaphoid length with autologous wedge grafting and fixation. However, there is still no consensus in the literature on the best fixation method. Therefore, the purpose of the study is to compare plate fixation and screw fixation in treating scaphoid nonunion with humpback deformity and carpal instability. Methods Prospective, non-randomised study comparing the treatment of two groups of patients with scaphoid nonunion. A total of 19 patients were included in the study, the first ten patients were included in group 1 (plate fixation), subsequently nine patients were included in group 2 (screw fixation). The nonunion duration was longer than 6 months and patients did not present type III Scaphoid Nonunion Advanced Collapse (SNAC). Clinical evaluations included pain intensity, range of motion, grip strength, pinch test and functional scales Disabilities of the Arm, Shoulder and Hand (DASH) and Mayo Wrist Score. Radiographic evaluations consisted of radiographs of both wrists in AP, AP with ulnar deviation, lateral and oblique views. Patients further underwent a tomography of the affected wrist for bone deformity, carpal collapse and later consolidation evaluation. Results According to post-operative measurements, group 1 showed a significant improvement in the scapholunate angle (p = 0.011) and in the intrascaphoid angle (p = 0.002). Group 2 only showed an improvement in the scapholunate angle (p = 0.011). All patients in group 1 achieved consolidation in 8 weeks, while group 2 patients had a slower consolidation, with a mean of 14 weeks and standard deviation (SD) of 4.2, with statistical significance (p = 0.006). Conclusion Our prospective study, despite the limitations, contributes to the literature for demonstrating a better fixation using plate, with a better correction of humpback deformity and Dorsal Intercalated Segment Instability (DISI) and a faster consolidation.
  • bookPart
    Retalhos do tronco
    (2021) NAKAMOTO, Hugo Alberto; ALVES, Jairo André de Oliveira
  • bookPart
    Reconstrução de membros inferiores
    (2015) MILCHESKI, Dimas André; NAKAMOTO, Hugo Alberto; MUNHOZ, Alexandre Mendonça
  • bookPart
    Princípios de microcirurgia
    (2021) OKADA, Alberto Yoshikazu; NAKAZATO, Fabio Furutani; NAKAMOTO, Hugo Alberto
  • article 1 Citação(ões) na Scopus
    Estudo prospectivo da sensibilidade tátil em mãos de uma população brasileira usando pressure-specified sensory device
    (2012) TUSTUMI, Francisco; NAKAMOTO, Hugo Alberto; TUMA JUNIOR, Paulo; MILCHESKI, Dimas André; FERREIRA, Marcus Castro
    OBJECTIVE: To evaluate the pressure perception thresholds on the pulp of two fingers (index and little fingers), among a Brazilian population with no nerve injury or neuropathy. METHODS: We used the Pressure-Specified Sensory Device (a computerized device) to derive static and dynamic normal pressure perception thresholds and two-point discrimination distances. RESULTS: We tested finger sensitivity on 30 volunteers. Significance analyses were performed using the Student t test. The mean values (g/mm²) for static one and two-point pressure thresholds (s1PD, s2PD) and dynamic one and two-point discrimination (m1PD, m2PD) in the dominant index finger were: s1PD = 0.4, m1PD = 0.4, s2PD = 0.48, m2PD = 0.51. CONCLUSION: There was no significant difference in sensitivity between the dominant and nondominant hands.
  • bookPart
    Anomalias congênitas do membro superior
    (2021) NAKAMOTO, Hugo Alberto; BISNETO, Edgard de Novaes França
  • article 1 Citação(ões) na Scopus
    Complications using tissue expanders in burn sequelae treatment at a reference university hospital: a retrospective study
    (2021) VANA, LUIZ PHILIPE MOLINA; LOBATO, RODOLFO COSTA; BRAGAGNOLLO, JOÃO PAULO FONTANA; LOPES, CRISTIANE PEREIRA; NAKAMOTO, HUGO ALBERTO; FONTANA, CARLOS; GEMPERLI, ROLF
    ABSTRACT Background: tissue expanders have high relevance in plastic surgery and among indications it is worth mentioning their use in the treatment of burn reconstruction. Although it shows good results, its use requires special care because some complications can interrupt the reconstruction process. The objective of this study was to report the experience of the Clinics Hospital (University of Sao Paulo) with the use of tissue expanders to treat burn sequelae, establishing the incidence of complications, and identifying risk factors for their occurrence. Methods: a retrospective, observational, and analytical study, evaluating the use of expanders in burns sequelae treatment from 2009 to 2018. Results: 245 expanders were placed in 84 patients, 215 were female, with a mean age of 19.96 years, being 40% in the trunk and 20% in the scalp, with a predominance of rectangular shape in 76.7% of cases. Complications were classified as major and minor.Complications occurred in 17.95% of cases, and extrusion and infection were the most common. There was a higher incidence of complications in expanders used in the upper and lower limbs as well as in those who did not undergo concomitant expansion (p <0.05), with an even higher chance of major complications in patients submitted to additional expansion. From 2009 to 2018, we observed a decrease in the incidence of complications. Conclusion: the complication rate (17.95%) is similar to other studies of the literature, there was a higher rate of complication with expanders placed in the limbs and a higher rate of major complications when additional expansion was done.
  • article 4 Citação(ões) na Scopus
    Sensory Testing in Patients With Hemodialysis-Associated Carpal Tunnel Syndrome Submitted to Surgical Decompression
    (2014) NAKAMOTO, Hugo Alberto; FERREIRA, Marcus Castro; TUSTUMI, Francisco; MILCHESKI, Dimas A.; TUMA, Paulo
    Background: Carpal tunnel syndrome (CTS) is the most common compression neuropathy of the upper limb. Close to 5% of patients with chronic renal failure who need hemodialysis present CTS. Clinical history and physical examination remain the most adequate tools for diagnosis, and there is still controversy regarding the most reliable test to complement it. Evaluation of sensory thresholds using Pressure-Specified Sensory Device (PSSD) has become an important instrumental test. Method: This study aimed to determine the values of pressure sensory thresholds using the PSSD before and after treatment of CTS in a special group of patients who underwent chronic hemodialysis. The PSSD incorporates a pressure transducer linked to a computer capable of measuring the cutaneous pressure thresholds referred by the patient. Two groups were compared as follows: group 1, patients with hemodialysis-related CTS; and group 2, CTS in nonYhemodialysis patients. The following measurements were assessed: static one point, moving one point, static two points, and moving two points. Results: There was improvement (lower thresholds) in the postoperative measurements in all parameters assessed in group 1, and improvements in all parameters except the moving one point test in group 2. Conclusions: Nerve decompression, as expected, can be considered a good treatment of CTS even in more severe cases as in those patients under hemodialysis. The PSSD tests were reliable to confirm the diagnosis and thus to indicate the decompression. It is even more beneficial to provide a comparison between preoperative and postoperative data and different causes of CTS.