ALEXANDRE MENDONCA MUNHOZ
Índice h a partir de 2011
15
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
73 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 73
- Effect of neoadjuvant chemotherapy on women undergoing breast cancer surgery and immediate breast reconstruction with latissimus dorsi flap and silicone implants(2017) D'ALESSANDRO, Gabriel Salum; POVEDANO, Alejandro; SANTOS, Lauren Klas Kurk Leme dos; MUNHOZ, Alexandre Mendonca; GEMPERLI, Rolf; GOES, Joao Carlos de SampaioThe use of the latissimus dorsi flap in immediate breast reconstruction is a relatively simple procedure using a flap with a very reliable and consistent vascularity. Neoadjuvant chemotherapy improves local surgical conditions; however, most chemotherapeutic agents are cytotoxic and may increase the risk of postoperative complications. This study evaluated the effects of neoadjuvant chemotherapy on women with cancer who underwent immediate breast reconstruction with latissimus dorsi flap and silicone implants. Data were collected from medical records of 102 patients with cancer who had undergone immediate breast reconstruction with latissimus dorsi flap and silicone implants from August 2010 to December 2014. Thirty-three patients received neoadjuvant chemotherapy (study group) and 69 patients underwent primary surgical treatment (control group). Three (2.9%) patients in the study group had a major postoperative complication (two cases of hematoma requiring surgical drainage and a case of flap necrosis), which was the only variable showing a significant difference between groups (P = 0.032). Neoadjuvant chemotherapy followed by cancer surgery with immediate breast reconstruction with latissimus dorsi flap and silicone implants was not associated with an increased risk of postoperative surgical and clinical minor complications. It was associated with a significant increase in postoperative major complications, despite the small number of cases. However, patients who received neoadjuvant chemotherapy had a significantly more aggressive disease and advanced-stage cancer, and required a more extensive cancer surgery.
- Hybrid Augmentation Mastopexy with New Generation of Smooth Surface Implants: Combining the Benefits of Fat Grafting, Inferior Muscle Support, and an L-Shaped Scar(2023) MUNHOZ, Alexandre Mendonca; NETO, Ary de Azevedo Marques; MAXIMILIANO, JoaoBackground:Augmentation mastopexy (AM) is a challenging procedure. Complications include implant displacement and visibility, which can be addressed, but the stability of the smooth implant surface and poor soft-tissue coverage may present limitations. This article describes a surgical technique for AM using a composite reverse inferior muscle sling associated with autogenous fat grafting. Methods:Forty-five patients (90 breasts; mean age, 37.7 & PLUSMN; 7.2 years) underwent hybrid composite reverse inferior muscular sling AM. An upper/medial pole area between the implant and the clavicle region and parasternal area was marked to receive fat grafting and divided into three zones. Three-dimensional imaging was used to evaluate lower pole stretch and intermammary distance. Results:The average implant volume was 265 cc (range, 175 to 335 cc). The average fat volumes in zones I/II and III were 80.1 (range, 61.6 to 95.2 cc) and 39.3 (range, 25.2 to 47.3 cc), respectively. Five complications were observed in three patients (6.6%)-minor dehiscence in two (4.4%) and nipple-areola asymmetry in one (2.2%). The lower pole stretched 11.51% (9.9 mm) and 9.8% (8.5 mm) on the right and left sides, respectively (P < 0.0001), between 10 days and 1 year postoperatively. The intermammary distance was reduced, on average, 49.9% (25.1 mm) (P < 0.001) between the preoperative value and 1 year postoperatively. Conclusions:Hybrid composite reverse inferior muscular sling has led to improved aesthetic results for patients with breast ptosis and poor tissue coverage. Fat grafting and recognizing cleavage zones are still important to obtain satisfactory results. This procedure offers a good alternative for AM candidates, providing an adequate smooth surface for implant stabilization.
- Usefulness of Radio Frequency Identification Device in Diagnosing Rotation of Motiva SmoothSilk Implants after Augmentation Mammoplasty(2019) MUNHOZ, Alexandre Mendonca; CHALA, Luciano; MELO, Giselle Guedes de; MARQUES FILHO, Ary de Azevedo; TUCUNDUVA, Tatiana; GEMPERLI, RolfBreast implant displacement has been described as a significant risk following augmentation mammoplasty. Magnetic resonance imaging (MRI) is considered the method of choice for diagnosing implant complications, but it has its limits in assessing correct implant position and displacement. Motiva SmoothSilk/SilkSurface (R) Implants (MSS) are the first to incorporate a radio frequency identification device (RFID), which produces an imaging artifact in MRI sequences. Given the frequency of breast augmentation procedures and the recent US Food and Drug Administration prospective trial involving SS with RFID, further analysis of implant stability and diagnostic imaging methods to evaluate implant positioning is necessary. The objective of this study was to assess the use of MRI with this new RFID-containing implant as a new tool to assess correct implant positioning. The authors performed this technique in 5 patients (10 implants) undergoing primary breast augmentation or revision surgery with MSS implants (255-385 cc, mean = 325 cc). The average area and volume of the artifact were 15.7 cm(2) and 31.75 cm(3), respectively. All cases presented satisfactory results, with 1 case of implant displacement. Our clinical and radiological outcome demonstrated that RFID technology is a useful tool for correct visualization of the implant position and diagnosis of complications such as slight displacements or rotation. To our knowledge, this is the first RFID breast implant that has been objectively evaluated for MRI issues.
- Response to: Nano-Surface Implants: Indications and Limitations(2021) SFORZA, Marcos; BOTTI, Giovanni; HEDEN, Per; ZACHEDDU, Renato; MUNHOZ, Alexandre Mendonca; MAYO, Federico; KINNEY, Brian M.; HAMMOND, Dennis C.; CORDUFF, Niamh; MORELLI, Humberto Uribe; STAVROU, Demetris; CENTENO, Jesus
bookPart Iniciação científica em cirurgia plástica na graduação médica(2015) MUNHOZ, Alexandre Mendonça; GEMPERLI, Rolf- Delphi Study Consensus Recommendations: Patient Selection and Preoperative Planning Measurements for Natrelle 410(2015) HEDEN, Per; BROWN, Mitchell H.; LUAN, Jie; MAXWELL, G. Patrick; MUNHOZ, Alexandre Mendonca; CARTER, MollieBackground: There is considerable variation in the planning and implementation process for breast augmentation. Although general guidelines are available, the distinctive characteristics of the Natrelle 410 breast implant warrant surgical guidelines specific to this device. This study aimed to develop consensus recommendations for patient selection and preoperative planning for Natrelle 410 in primary breast augmentation. Methods: Surgeons were invited to participate in this study, which used a modified Delphi method. Participants completed 2 rounds of online surveys, with the second round (Recommendations Survey) based on responses from the first round. Respondents also listed their top priorities for using Natrelle 410 implants. Results: Participants (n = 22) reached consensus on 15 of 18 criteria for patient selection; tuberous breasts, patient preference regarding upper pole shape, and asymmetry of the breasts were the top 3 patient characteristics considered appropriate for the use of Natrelle 410. Consensus was reached on 38 of 51 items related to preoperative planning, with 8 measurements and 6 markings recommended by the participants. Patient-desired outcome was considered the most essential element for Natrelle 410 implant selection; quality of skin envelope and height and width dimension of the breast were selected as the most essential elements for Natrelle 410 implant volume selection. Conclusions: The modified Delphi method resulted in consensus recommendations for patient selection and preoperative planning in primary breast augmentation with the Natrelle 410 breast implant. These recommendations and priorities, used in concert with a surgeon's clinical experience, are designed to optimize surgical outcomes.
- Outcome Analysis of Immediate and Delayed Conservative Breast Surgery Reconstruction With Mastopexy and Reduction Mammaplasty Techniques(2011) MUNHOZ, Alexandre Mendonca; ALDRIGHI, Claudia Maria; MONTAG, Eduardo; ARRUDA, Eduardo; BRASIL, Jose Augusto; FILASSI, Jose Roberto; ALDRIGHI, Jose Mendes; GEMPERLI, Rolf; FERREIRA, Marcus CastroBackground: Bilateral mammaplasty or mastopexy is frequently used for oncoplastic objectives. However, little information has been available regarding outcome following immediate and delayed reconstruction. Method: Patients were divided into Group I (immediate reconstruction) and Group II (delayed reconstruction). Retrospective review was performed to compare complications, length of hospital stay, revision surgeries, and satisfaction. The associations between the complications with potential risk factors (timing, age, body mass index, smoking, and comorbid medical conditions) were analyzed. Results: There were a total of 144 patients with a mean follow-up of 47 months. Of the 106 patients in Group I, complications occurred in 24 (22.6%), skin necrosis was observed in 7.5%, fat necrosis in 5.6%, and 6.6% patients developed local recurrence. Mean period of hospitalization was 1.89 days. Of the 38 patients of the Group II, complications occurred in 12 (31.5%), skin necrosis was observed in 7 (18.4%), fat necrosis in 4 (10.5%), and 5.2% patients developed local recurrence. Mean period of hospitalization was 1.35 days. Increased length of hospital stay greater than 1 day (P < 0.001) and the number of revision surgeries (P = 0.043) were associated with the timing of the reconstruction. In univariate analysis, no difference between groups was found with respect to complication incidence (P = 0.275); however, after adjusting for other risk factors, the probability of complications tend to be higher for Group II (OR = 2.65; 95% confidence interval - 1.01-7.00; P = 0.049). Conclusions: On the basis of the results of our study, the probability of complications tends to be higher for delayed reconstructions, and it is demonstrated that obesity and smoking are risk factors for complications. Ultimately, these data may facilitate the provision of individualized risk information for shared medical decision-making.
- The surface topography of silicone breast implants mediates the foreign body response in mice, rabbits and humans(2021) DOLOFF, Joshua C.; VEISEH, Omid; MEZERVILLE, Roberto de; SFORZA, Marcos; PERRY, Tracy Ann; HAUPT, Jennifer; JAMIEL, Morgan; CHAMBERS, Courtney; NASH, Amanda; AGHLARA-FOTOVAT, Samira; STELZEL, Jessica L.; BAUER, Stuart J.; NESHAT, Sarah Y.; HANCOCK, John; ROMERO, Natalia Araujo; HIDALGO, Yessica Elizondo; LEIVA, Isaac Mora; MUNHOZ, Alexandre Mendonca; BAYAT, Ardeshir; KINNEY, Brian M.; HODGES, H. Courtney; MIRANDA, Roberto N.; CLEMENS, Mark W.; LANGER, RobertSilicone is widely used in chronic implants and is generally perceived to be safe. However, textured breast implants have been associated with immune-related complications, including malignancies. Here, by examining for up to one year the foreign body response and capsular fibrosis triggered by miniaturized or full-scale clinically approved breast implants with different surface topography (average roughness, 0-90 mu m) placed in the mammary fat pads of mice or rabbits, respectively, we show that surface topography mediates immune responses to the implants. We also show that the surface surrounding human breast implants collected during revision surgeries also differentially alters the individual's immune responses to the implant. Moreover, miniaturized implants with an average roughness of 4 mu m can largely suppress the foreign body response and fibrosis (but not in T-cell-deficient mice), and that tissue surrounding these implants displayed higher levels of immunosuppressive FOXP3(+) regulatory T cells. Our findings suggest that, amongst the topographies investigated, implants with an average roughness of 4 mu m provoke the least amount of inflammation and foreign body response. The surface topography of breast implants mediates the immune responses to them, and implants with an average roughness of 4 mu m largely suppress foreign body response and fibrosis.
- The influence of type of vascular pedicle occlusion on the viability of skin island flaps. A postoperative quantitative assessment of flap survival in an experimental model in rats(2013) GEMPERLI, Rolf; MUNHOZ, Alexandre MendoncaPURPOSE: To evaluate the role of pedicle occlusion on the viable area of a skin island flap. METHODS: An epigastric skin island flap was performed in 160 Wistar rats. The animals were randomly divided into four groups: G-1: occlusion of inferior epigastric artery; G-2: inferior epigastric vein; G-3: inferior epigastric vessels (artery/vein). At varying times postoperatively (2,3,4,5th day), animals from each group were randomly selected, and the pedicle was occluded. On the 10th. postop. day, the skin flaps were evaluated by templates to determine the percentage of surviving skin. The computer HP T 9830A captured the photographs and the mean flap necrosis area was assessed. RESULTS: An increasing area of flap survived with less area of necrosis with increased time of days intervals. In the G-1, the mean area of necrosis observed (two to five days) were 95.2, 60.8, 31 and 3.7 % respectively. In the G-2 were 95.5, 57.6, 19.5 and 5.6 % respectively. In the G-3, a 100, 80, 32.4 and 14.9 % of mean area was observed. CONCLUSIONS: The arterial suppy/venous drainage is important for flap circulation up to five days following pedicle occlusion. After this period, the pedicle can be interrupted once the circulation through the flap margins has already been established.
- Breast Implant Surfaces and Their Impact on Current Practices: Where We Are Now and Where Are We Going?(2019) MUNHOZ, Alexandre Mendonca; CLEMENS, Mark W.; NAHABEDIAN, Maurice Y.Most commercially available breast implants feature some degree of elastomer surface modifications to increase surface roughness, in part because several clinical series have demonstrated positive outcomes from texturizing. However, the literature shows that textured implants support higher rates of bacterial growth, and there is a clear association between increased bacterial contamination and host response in vivo, such as capsular contracture. Furthermore, the infectious theory related to bacterial contamination has recently been described as a potential cause in the etiology of anaplastic large-cell lymphoma. Recent research has focused on the physiology of breast implant surfaces advances and how they interact with the body, creating new surface technologies which have the potential to affect all aspects of breast surgery. Understanding how surface properties affect inflammatory cell response will be essential in designing implants that can provide an esthetic solution while also minimizing long-term clinical complications. This special topic highlights the current knowledge on silicone implant surfaces, as well as innovations that have shaped and will continue to change the silicone breast implant industry in the future. It also provides an overview of the principal surfaces that exist and may find clinical applications in esthetic and reconstructive breast surgery. As additional advances emerge, objective tools will be required to evaluate the different surfaces available on the market, along with the long-term efficacy of new technologies.