Alfredo Benjamim Duarte da Silva

Retalho ósseo pré-fabricado com osso homógeno: estudo da maturação óssea em um modelo experimental

As conventional options for bone repair are not satisfactory, a new flap category was developed, the prefabricated flap (RPF). 42 metatarsic-I bone were obtained from 21 Wistar rats, and divided in two groups: group I (n=21) the bones were freeze- dryed and decalcified and group II (n=21) was frozen to - 70o C. After 3 weeks the bones were grafted in 21 rats, onto the left na right inferior epigastric vessels wrapped in silicon sheet. Groups I and II were subdivided in 3 groups each, following the period of permanence (1,2 or 4 weeks). In macroscopic histologic study, group I revealed loss of bone architecture and group II manteined its concistency and shape. In quantitative analysis, alterations were observed in group I, mainly inthe 2 weeks group. There is a histologic difference in prefabricated bone flaps betwenn groups I and II. Gradual bone reabsorption suggests that the flap should be rotated early. This study shows the applicability of homogenous bone for flap prefabrication.

Effects of venous supercharging in deep inferior epigastric artery perforator flap

PURPOSE To evaluate the effects of venous supercharging in deep inferior epigastric artery perforator flap in rats. METHODS 20 Wistar rats were randomized in 2 groups: control group (C), all had flaps raised based on the deep inferior epigastric perforator vessels (DIEP), and experimental group (E), which was identical to group C, except that the contralateral superficial inferior epigastric vein was also kept with the flap. Flow studies using laser Doppler flowmetry where performed daily in the four zones of the flap. On the 7th postoperative day rats were killed and flap survival was determined using digital planimetry. RESULTS Flow values were presented as a percentage of the baseline flow after incision of the flap edges. The surviving flap area was demonstrated as a percentage of the total flap area. Evaluation by digital planimetry showed that flap survival in group E was higher than in group C (97,38%+/-1,32%vs.44,13%+/-4,83%, p=0,0006). CONCLUSION This study shows that venous supercharging of the rat DIEP flap results in greater flap survival.

Escolha do vaso receptor em reconstrução de mama microcirúrgica

BACKGROUND: Microvascular transfer of autogenous tissue have become the gold standard for breast reconstruction. As in any free tissue reconstruction, recipient vessel choice is fundamental for adequate planning in breast reconstruction. The purpose of the present study is to determine which of the available recipient vessels (the internal mammary artery and its perforators vessels or circumflex scapular vessels) are adequate for microvascular breast reconstruction. METHODS: A retrospective analysis of 117 consecutive patients who underwent microvascular breast reconstruction between January 2005 and December 2007 was performed. An algorithm that could be applied to the selection of the recipient vessel based in the axillary node dissection, immediate or late reconstruction, preoperative radiotherapy was established. Flap related complications, conversion rate and clinical outcomes were analised. RESULTS: The internal mammary perforator, the internal mammary and the circumflex scapular are adequate recipient vessels for breast reconstruction, with similar rates of complications and viability. We also observed a lower flap viability rate when using superficial inferior epigastric artery flap comparing to deep inferior epigastric artery perfurator and transverse rectus abdominis musculocutaneous with muscle preservation flaps. CONCLUSIONS: Microsurgical breast reconstruction is a safe and reliable method, with high flap viability and low complications.

Retalho músculo cutâneo de pálpebra superior para inferior com pedículo medial para correção de ectrópio

DOI: 10.5935/2177-1235.2018RBCP0060 Introdução: O ectrópio se caracteriza por uma eversão da margem palpebral, e é mais comum na pálpebra inferior. O processo de exposição ocular associado a esse quadro pode levar a sequelas graves, como a perda ocular. Muitos retalhos foram propostos para tratar esse quadro. Contudo, a taxa de recorrência pode ser alta, e quando o defeito se localiza na porção medial da pálpebra, ele se torna muito mais desafiador. Por isso, é fundamental que o cirurgião disponha de uma variedade de estratégias cirúrgicas para tratar adequadamente esses casos, definindo, em cada circunstância, qual a melhor técnica a ser adotada, entre as possibilidades disponíveis. O objetivo é apresentar o emprego do retalho miocutâneo de pálpebra superior para inferior, pediculado medialmente, como alternativa no tratamento de três casos de ectrópio Métodos: Tratamento de pálpebra inferior com retalho miocutâneo de pálpebra superior para inferior, pediculado medialmente. Três casos pós-ressecção de lesão oncológica que evoluíram com ectrópio de pálpebra inferior (um deles já recidivado) e que foram trados com retalho miocutâneo de pálpebra superior para inferior, pediculado medialmente; nenhum dos 3 casos apresentou recidiva após essa abordagem proposta. Conclusão: O retalho miocutâneo de pálpebra superior para inferior com pedículo medial demonstrouse uma opção viável, com resultado funcional e estético satisfatório, sem trazer grande prejuízo à área doadora e apresentando pele de cor, espessura e textura adequada à reconstrução da pálpebra inferior. ■ RESUMO