ALBERTO YOSHIKAZU OKADA
Projetos de Pesquisa
Unidades Organizacionais
Instituto do Câncer do Estado de São Paulo, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina
LIM/04 - Laboratório de Microcirurgia, Hospital das Clínicas, Faculdade de Medicina
6 resultados
Resultados de Busca
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- Optimizing Outcomes in Free Flap Breast Reconstruction in the Community Hospital Setting: A Stepwise Approach to DIEP/SIEA Flap Procedures with Banking a Hemiabdominal Flap(2017) OKADA, Alberto; PEREIRA, Diego Daniel; MONTAG, Eduardo; PORTOCARRERO, Marcelo; FELICIO, Carlos; ARRUDA, Eduardo Gustavo; FONSECA, Alexandre; GEMPERLI, Rolf; MUNHOZ, Alexandre MendoncaBackground Free flap breast reconstruction is a conventional procedure in many countries; however, microvascular compromise remains a devastating outcome. Given the morbidity of total necrosis, optimizing free flap salvage stands out as an important area for research, especially among surgeons to overcome the learning curve period and in resource constrained scenario such as community hospitals. To ensure free deep inferior epigastric perforator (DIEP)/superficial inferior epigastric artery (SIEA) flap breast reconstruction, the authors present a technique involving raising a hemiabdominal flap as a free flap, and banking the remaining flap to be utilized if needed in a subsequent procedure. Methods A retrospective review was performed on all free flap breast reconstructions. In this period, 84 patients (mean age: 50.18 years) were included. Results In this study, 65.5% patients underwent immediate reconstruction, and 51.2% received DIEP reconstruction; 9.52% patients were returned to the operating room, and salvage reconstruction using the banked flap was performed in all patients. No differences were observed regarding early complications and age, body mass index, American Society of Anesthesiologists status, diabetes, smoking history, chemotherapy, radiotherapy, and type of flap used ( p >0.05). Hypertension was significantly associated with early complications ( p <0.05). Donor-site complications were associated with RT ( p <0.05). Conclusion The banked flap is a reliable method for ensuring DIEP/SIEA flap survival and should be considered in higher risk reconstructions and community hospitals. We believe that the present technique can be a good addition to the arsenal of plastic surgeons dealing with free flap breast reconstructions in selected patients.
- Impact of Fat Graft Thickness and Harvesting Technique on Adipocyte Viability in a New Porcine Experimental Model: An Immunohistochemical Analysis(2021) ARRUDA, Eduardo Gustavo Pires de; MUNHOZ, Alexandre Mendonca; MATSUMOTO, Walter; UEDA, Thiago; MONTAG, Eduardo; OKADA, Alberto; COUDRY, Renata de Almeida; CASTRO, Isac de; GEMPERLI, RolfBackground: Autologous fat grafting (AFG) has been employed in surgical practice as a filling method. However, controversies remain on the specifics of this technique. So far, few relevant experimental large animal studies have objectively assessed factors related to AFG integration. Objectives: This study utilized an experimental, medium-sized animal model to compare the feasibility of AFG collected employing 2 different techniques with instruments of distinct thicknesses. Methods: Twenty minipigs (Sus scropha domesticus) were subjected to AFG harvesting via en bloc resection utilizing 3-(Group I) and 5-mm-diameter (Group II) round punch blades (PBs) and liposuction (LS) with 3- (Group III) and 5-mm-diameter cannulas (Group IV). Both samples were grafted intramuscularly (biceps femoralis). Hematoxylin and eosin staining was employed to identify intact adipocytes, fat necrosis, fibrosis, inflammation, and oil cysts. Immunohistochemical staining (perilipin-A, tumor necrosis factor alfa, and cluster of differentiation number 31) was utilized to quantify the feasibility of adipocytes, tissue necrosis, and neoangiogenesis, respectively. Results: Hematoxylin and eosin analysis showed that fat necrosis and histiocyte presence were significantly lower in the AFG harvested utilizing a PB than in LS. For perilipin-A, a statistical difference was observed between subgroups I and III (P = 0.001) and I and IV (P = 0.004). Instrument diameter had no effect on graft integration in comparisons between groups II and III (P = 0.059) and II and IV (P = 0.132). Conclusions: In this experimental study, fat collected utilizing a PB demonstrated higher adipocyte viability than fat collected with LS. The diameter of the collection instruments, whether PB or LS, had no effect on graft integration.
- Immediate Locally Advanced Breast Cancer and Chest Wall Reconstruction: Surgical Planning and Reconstruction Strategies with Extended V-Y Latissimus Dorsi Myocutaneous Flap(2011) MUNHOZ, Alexandre Mendonca; MONTAG, Eduardo; ARRUDA, Eduardo; OKADA, Alberto; BRASIL, Jose Augusto; GEMPERLI, Rolf; FILASSI, Jose Roberto; FERREIRA, Marcus CastroBackground: Surgical resection in locally advanced breast cancer produces large defects that may not be suitable for primary closure. Immediate reconstruction is controversial and presents a complicated scenario for breast surgeons and plastic surgeons. Methods: In this study, a different design was planned for the latissimus dorsi musculocutaneous flap with primary closure in V-Y for the correction of major lesions in the anterior chest wall. Twenty-five patients underwent immediate locally advanced breast cancer reconstruction with a V-Y latissimus dorsi musculocutaneous flap. This flap was raised from adjacent tissue located on the lateral and posterior thoracic region and presented a triangular shape whose base was the lateral aspect of the mastectomy wound. The technique was indicated in patients with large thoracic wounds. Results: Mean follow-up time was 16 months. Closure was obtained in the donor and recipient sites without the use of skin grafts or other more major procedures. Complications occurred in nine patients (36 percent), including dorsal wound dehiscence in five patients and seroma in three. All cases except one were treated by a conservative approach with a good result. No total flap loss was reported. All patients achieved a satisfactory thoracic reconstruction and adequate wound care. Conclusions: The V-Y latissimus dorsi musculocutaneous flap is a reliable technique for immediate locally advanced breast cancer reconstruction. The technique is advantageous because the V-Y design allows primary closure of the chest wound and donor defect. Success depends on patient selection, coordinated planning with the breast cancer surgeon, and careful intraoperative management. (Plast. Reconstr. Surg. 127: 2186, 2011.)
- Influência do posicionamento do retalho linfonodal vascularizado na resposta ao tratamento cirúrgico do linfedema secundário ao câncer de mama.(2019) MONTAG, Eduardo; OKADA, Alberto Yoshikazu; ARRUDA, Eduardo Gustavo Pires; FONSECA, Alexandre Siqueira; BROMLEY, Miluska; MUNHOZ, Alexandre Mendonça; BUSNARDO, Fábio Freitas; GEMPERLI, RolfABSTRACT Objective: to evaluate the initial therapeutic experience of transplantation of vascularized lymph nodes in patients with lymphedema of the upper limbs secondary to the treatment of breast cancer, and to verify if the positioning of the transplant influences the surgical result. Methods: we conducted a prospective, comparative test of two therapeutic modalities, with 24 patients with lymphedema of the upper limb after breast cancer treatment, classified as grades 2 and 3, according to the International Lymphedema Society. The two types of procedures performed were: 1) total breast reconstruction with - deep inferior epigastric perforator (DIEP) flap associated with lymph node flap, in patients with no previous breast reconstruction or loss of previous reconstruction (axillary positioning); 2) isolated inguinal lymph node flap performed in patients with completed breast reconstruction or without the desire to perform the breast reconstruction (wrist positioning). Results: the reduction percentage of the affected limb volume was 20.1% (p=0.0370). The number of infectious episodes (cellulites) also decreased significantly, from 41% in the preoperative period to 12.5% in the postoperative one (p=0.004). There were no differences between the proximal and distal groups. Conclusion: the transplantation of lymph nodes positively affected the postoperative evolution of patients with lymphedema secondary to breast cancer. We observed no differences in relation to flap positioning.
- Influence of advanced age on postoperative outcomes and total loss following breast reconstruction: a critical assessment of 560 cases(2018) MATSUMOTO, WALTER KOITI; MUNHOZ, ALEXANDRE MENDONÇA; OKADA, ALBERTO; MONTAG, EDUARDO; ARRUDA, EDUARDO GUSTAVO; FONSECA, ALEXANDRE; FERRARI, ORLANDO; BRASIL, JOSÉ AUGUSTO; PRETTI, LIA; FILASSI, JOSÉ ROBERTO; GEMPERLI, ROLFABSTRACT Objective: to evaluate the role of age in the risk of postoperative complications in patients submitted to unilateral breast reconstruction after mastectomy, with emphasis on total reconstruction loss. Methods: we conducted a retrospective study of patients submitted to breast reconstruction, whose variables included: oncological and reconstruction data, postoperative complications, including loss of reconstruction and complications of surgical wound. We divided the patients into two groups, according to the classification of the Brazilian National Elderly Policy and the Statute of the Elderly: young (age <60 years) and elderly (60 years or more). We also grouped them according to the World Health Organization classification: young people (age <44 years), middle age (45-59 years); elderly (age 60-89 years) and extreme advanced age (90 years or older). We applied the surgical risk classification of the American Society of Anesthesiologists to investigate the role of the preoperative physical state as a possible predictor of complications. Results: of the 560 patients operated on, 94 (16.8%) were 60 years of age or older. We observed a local complication rate of 49.8%, the majority being self-limited. The incidences of necrosis, infection and dehiscence were 15.5%, 10.9% and 9.3%, respectively. Patients older than 60 years presented a chance of complication 1.606 times greater than the younger ones. Forty-five (8%) patients had loss of the reconstruction; there was no statistically significant difference in the mean age of the patients who presented this result or not (p=0.321). Conclusion: in selected patients, breast reconstruction can be considered safe; most documented complications were limited and could be treated conservatively.
- The use of contralateral free extended latissimus dorsi myocutaneous flap for a tertiary failed breast reconstruction: Is it still an option?(2016) MUNHOZ, Alexandre Mendonca; MONTAG, Eduardo; ARRUDA, Eduardo Gustavo; OKADA, Alberto; FONSECA, Alexandre; FILASSI, Jose Roberto; GEMPERLI, RolfBackground: Unsuccessful breast reconstruction management represents a complex challenge for the plastic surgeon. Although these events rarely occur, many patients are not suitable candidates for conventional flaps, because of either previous donor-site surgery or lack of sufficient tissue. Methods: In this study, a contralateral free latissimus dorsi musculocutaneous flap (CL-LDMF) was planned for correction of major lesions in the anterior chest wall. Twelve patients underwent secondary/tertiary breast reconstruction with CL-LDMF with a customized shape (horizontal, oblique, or ""fleur-de-lis"") depending on the amount of tissue necessary. The technique was indicated in patients with large thoracic defects who lacked a donor site and had undergone previous unsuccessful pedicled LDMF. Results: The mean follow-up time was 42.5 months (range: 18-72 months). Five local complications occurred in four of the 12 patients. Dorsal dehiscence was observed in one, local wound infection in one, small partial CL-LDMF necrosis in one, and dorsal seroma in one patient. All cases of complications were limited and treated with a conservative approach except for one implant extrusion 4 months after reconstruction. No total flap loss was reported. All patients achieved a satisfactory thoracic and breast reconstruction. Conclusion: The results of this study demonstrate that free CL-LDMF is a reliable technique and should be considered in selected cases of tertiary reconstructions. The majority of complications were immediate, minor, and comparable to other reconstructive techniques. We believe that in selected patients, especially those who do not have available donor-site areas, free CL-LDMF is advantageous and should be part of the armamentarium of all plastic surgeons who deal with tertiary breast reconstructions.