Barriers and Facilitators for Under-Represented in Medicine (URiM) Medical Students Interested in Surgical Sub-specialties.

Background: Little is known on drivers and detractors underrepresented in medicine (URiM) medical students face. Methods: Using the nominal group technique (NGT), we explored experiences that strengthen or weaken the enthusiasm to pursue a career in surgery among URiM medical students (October 2021- April 2022); participants voted on the three most important experiences (weight of 3= top rated, = 1 for the lowest rated). Responses from NGT with at least one vote were weighted, ranked, and categorized. Results: Seventeen students participated. Experiences that strengthen enthusiasm (36 responses with at least one vote) involved mentorship and role models (weighted sum percentage, 35%), demonstrating grit (15%), lifestyle (15%), patient interactions (14%), technical skills (11%), community and team (10%), and intellectual stimulation (1%). Experiences that weaken enthusiasm (33 responses with at least one vote) include the minority experience (weighted sum percentage, 51%), quality of life (25%), toxic environment (13%), lack of information (7%), and finances (5%). Conclusions: Mentorship, demonstrating grit, and feeling a sense of community were important positive experiences or attitudes. The minority experience, toxic environment, perceptions of self-worth, and lifestyle misconceptions perceived by URiM must be addressed to increase diversity, equity, and inclusion.

A Systematic Review of Microsurgical Pedicle Lengthening in Free Tissue Transfer.

INTRODUCTION: Traumatic injuries that require free tissue flaps for reconstruction may require vascular pedicle extension between the flap and recipient vessels to form a clear anastomosis. Currently, a variety of techniques are used, each with their own potential benefits and harms. In addition, reports in the literature conflict on the reliability of pedicle extensions of vessels in free flap (FF) surgery. The objective of this study is to systematically assess the available literature about outcomes of pedicle extensions in FF reconstruction. METHODS: A comprehensive search was performed for relevant studies published up to January 2020. Study quality was assessed using the Cochrane Collaboration risk of bias assessment tool and a set of predetermined parameters was extracted by 2 investigators independently for further analysis. The literature review yielded 49 studies investigating pedicled extension of FF. Studies meeting inclusion criteria underwent data extraction focusing on demographics, conduit type, microsurgical technique, and postoperative outcomes. RESULTS: The search yielded 22 retrospective studies totaling 855 procedures from 2007 to 2018 in which 159 complications (17.1%) were reported in patients aged between 39 and 78 years. Overall heterogeneity of articles included in this study was high. Free flap failure and thrombosis were the 2 most prevalent major complications noted: vein graft extension technique had the highest rate of flap failure (11%) in comparison with the arterial graft (9%) and arteriovenous loops (8%). Arteriovenous loops had a rate of thrombosis of 5% versus 6% in arterial grafts and 8% in venous grafts. Bone flaps maintained the highest overall complication rates per tissue type at 21%. The overall success rate of pedicle extensions in FFs was 91%. Arteriovenous loop extension resulted in a 63% decrease in the odds of vascular thrombosis and a 27% decrease in the odds of FF failure when compared with venous graft extensions (P < 0.05). Arterial graft extension resulted in a 25% decrease in the odds of venous thrombosis and a 19% decrease in the odds of FF failure when compared with venous graft extensions (P < 0.05). CONCLUSIONS: This systematic review strongly suggests that pedicle extensions of the FF in a high-risk complex setting are a practical and effective option. There may be a benefit to using arterial versus venous conduits, although further examination is warranted given the small number of reconstructions reported in the literature.

Do Socioeconomic Status and Race Impact the Safety and Efficacy of Breast Reconstruction?

INTRODUCTION: Immediate breast reconstruction after mastectomy has increased in recent years when compared with delayed reconstruction. Despite this encouraging trend, racial and socioeconomic disparities in the receipt of postmastectomy breast reconstruction have been well documented. We sought to assess the effect of race, socioeconomic status, and patient comorbidities on muscle sparing transverse rectus abdominis myocutaneous outcomes at our safety net hospital institution in the southeast. METHODS: The database of a tertiary referral center was queried for patients who received free transverse rectus abdominis myocutaneous flaps for immediate reconstruction after mastectomy meeting inclusion criteria from 2006 to 2020. Patient demographics and outcomes were compared based on socioeconomic status. The primary outcome (reconstructive success) was defined as breast reconstruction without flap loss. Statistical analysis included analysis of variance and χ2 tests were appropriate using Rstudio. RESULTS: Three-hundred fourteen patients were included in the study, with 76% White, 16% Black, and 8% other. Overall complication rate at our institution was 17% and reconstructive success was 94%. Non-White race, older age at time of breast cancer diagnosis, higher body mass index, and presence of comorbid conditions including current smoking and hypertension were all associated with low socioeconomic status. Despite this, surgical complication rates were not predicted by non-White race, older age, or presence of diabetes mellitus. When analyzing major and minor complications based on radiation received or reconstructive success, there was no significant difference regardless of radiation treatment with the group overall achieving a 94% success rate (P = 0.229). CONCLUSIONS: This study aimed to characterize the impact of socioeconomic status and race/ethnic status of patients on breast reconstruction outcomes at an institution in the South. We found that despite the greater morbidity in low income and ethnic/minority patients that when treated by a comprehensive safety net institution, they had excellent reconstructive outcomes due to low complications and minimal reoperations.

Outcomes of Ventral Hernia Repair After Orthotopic Liver Transplant Using Component Separation and Onlay Biologic Mesh.

INTRODUCTION: The management of ventral hernias (VHs) after orthotopic liver transplant (OLT) can be uniquely challenging because of immunosuppression coupled with large laparotomy size that can compromise the quality of the abdominal wall. The component separation with multipoint suture onlay acellular dermis fixation technique has proven to be effective in high-risk abdominal wall reconstructions. The goal of this study was to elucidate the factors that affect safety and efficacy of VH repair in post-OLT patients. METHODS: A retrospective review of 345 patients who underwent repair of VH with compartment separation and onlay acellular dermal matrix reinforcement from a single surgeon from 2012 to 2020 was conducted. Of these, 27 patients were identified with a history of OLT and were stratified based on whether the defect was a initial or recurrent hernia repair. The majority of patients had a standard chevron incision (70%). Data abstraction was performed for preoperative risk factors, hernia characteristics, surgical site complications, and postoperative course including hernia recurrence. RESULTS: A majority of cases in the study period were initial hernia repairs (59%) with no significant differences in the patient demographics and size of VH defects (190 ± 112.69 cm 2 ). Comorbidities were similar between the groups with the exception of a significantly higher baseline creatinine levels and higher history of smoking in the recurrent hernia repair group ( P < 0.05). Of the 27 cases, there were no demonstrable hernia recurrences noted and an overall 11% complication rate. Univariate analysis noted a statistically significant difference in surgical site complication rate ( P = 0.017), with the initial hernia repair group having the lowest rate of surgical site complications. CONCLUSIONS: In complex post-OLT patients with large VH, modified component separation with onlay acellular mesh was shown to have acceptable medium-term results. Further studies investigating the factors leading to postoperative complications are necessary to reduce recurrence in this evolving patient population.

The Safety of Fat Grafting: An Institutional Retrospective Review.

BACKGROUND: Autologous fat grafting is a popular technique for volume replacement in the breast and face. The efficacy, safety, and complication rate of this technique at the division of plastic surgery at the University of Alabama at Birmingham will be described in this review. METHODS: An institutional review board-approved retrospective review of patients undergoing fat grafting procedures from January 2015 to July 2018 was performed. Records were reviewed for fat graft recipient site, donor site, amount grafted, and complications. Continuous variables were compared using either a t test or one-way analysis of variance test. Categorical data were compared using χ2 test. A P value of 0.05 or less was considered statistically significant for all comparisons. RESULTS: A total of 396 patients who underwent fat grafting procedures of the face and body from January 2015 through July 2018 met inclusion criteria. Average amount of fat grafted for all grafts was 124.4 +/- 6.74 grams. Two hundred fifty of the grafts (62.7%) involved the bilateral breasts with an average of 140.6 +/- 93.97 g used, 70 per side. Of the 396 patients, 110 (27.8%) experienced complications. Forty three of the complications (10.9%) were considered to be major, which included hematomas/seromas, fat necrosis, dermatitis/cellulitis, and infection. No statistical differences were seen among recipient site complication rate. Types of minor complications were statistically significant per recipient sites with bilateral breasts more likely to experience asymmetry than the other recipient sites (20% for bilateral breasts vs 16% overall, P < 0.05). Fifty nine of the 110 patients (53.6%) had the complications reported to be resolved. CONCLUSIONS: Fat grafting is a reliable method for volumization of the breasts and face. Minor complications were not infrequent in this case series; however, no life-threatening complications were observed. Continued work needs to be done to use fat grafting beyond traditional measures.

Comorbidity Trends in Patients Requiring Sternectomy and Reconstruction: Updated Data Analysis From 2005 to 2020.

INTRODUCTION: Comorbidity trends after median sternectomy were studied at our institution by Vasconze et al (Comorbidity trends in patients requiring sternectomy and reconstruction. Ann Plast Surg. 2005;54:5). Although techniques for sternal reconstruction have remained unchanged, the patient population has become more complex in recent years. This study offers insight into changing trends in this patient population. METHODS: A retrospective review was performed of patients who underwent median sternectomy followed by flap reconstruction at out institution between 2005 and 2020. Comorbidities, reconstruction method, average laboratory values, and complications were analyzed. RESULTS: A total of 105 patients were identified. Comorbidities noted were diabetes (27%), immunosuppression (16%), hypertension (58%), renal insufficiency (23%), chronic obstructive pulmonary disease (16%), and tobacco utilization (24%). The most common reconstruction methods were omentum (45%) or pectoralis major flaps (34%). Thirty-day mortality rates were 10%, and presence of at least 1 complication was 34% (hematoma, seroma, osteomyelitis, dehiscence, wound infection, flap failure, and graft exposure). Univariate analysis demonstrated that sex (P = 0.048), renal insufficiency, surgical site complication, wound dehiscence, and flap failure (P < 0.05) had statistically significant associations with mortality. In addition, body mass index, creatinine, and albumin had a significant univariate association with mortality (P < 0.05). CONCLUSIONS: Similar to the original study, there is an association between renal insufficiency and mortality. However, the mortality rate is decreased to 10%, likely because of improved medical management of patients with increasing comorbidities (80% with greater than one comorbidity). This has led to the increased use of omentum as a first-line option. Subsequent wound dehiscence and flap failure demonstrate an association with mortality, suggesting that increasingly complex patients are requiring a method of reconstruction once used a last resort as a first-line option.

The Case for Onlay Biologic Mesh in Abdominal Wall Reconstruction Using Progressive Tension Suture Fixation.

BACKGROUND: After many years of debate, underlay and sublay placement of mesh slowly emerged as the standard of care in abdominal wall reconstruction because of lower hernia recurrence rates. However, onlay has the advantages of being faster, less invasive, and technically easier compared with underlay and sublay. Therefore, if a similar recurrence could be achieved, then onlay should be a consideration. In this study, we present a new onlay method using multipoint progressive tension suture fixation. METHODS: This was a retrospective chart review of patients who underwent abdominal wall reconstruction from 2012 to 2019. Inclusion criteria included onlay mesh placement and at least 1 year of follow-up. The core principles of the surgical technique are establishing myofascial continuity by component separation and reinforcing the repair with onlay mesh that is fixated with multipoint progressive tension sutures. RESULTS: The number of patients after exclusions was 59, and the average body mass index was 32.52 ± 6.44 kg/m2. More than half (62.7%) of patients had a history of hypertension, 95% had at least 1 prior abdominal/pelvic surgery, and 61% had at least 1 prior hernia repair. Postoperative complications included 20.3% of patients requiring drainage of a fluid collection in the clinic setting, and 29.3% of patients requiring return to the operating room for any reason (including superficial wound debridement). The average defect size was 231.88 ± 195.86 cm2, the mean follow-up was 3.11 ± 1.83 years, and the recurrence rate was 5.1%. CONCLUSIONS: We report a hernia recurrence rate of 5.1% in a high-risk population with complex defects at a mean of 3.1 years of follow-up using onlay mesh fixated with multipoint progressive tension sutures. This recurrence rate is similar to that reported for both underlay and sublay techniques. However, the onlay approach is technically easier, faster, and less invasive compared with underlay and sublay techniques, which may translate into wider reproducibility, lower costs, and improved patient safety.

Alloderm and Cortiva Have Similar Perioperative Wound Complications in Abdominal Wall Reconstruction.

BACKGROUND: Although controversial, the use of acellular dermal matrices (ADMs) for abdominal wall reconstruction (AWR) is increasing. There are now many different ADMs available, but there is a lack of studies directly comparing ADMs in terms of outcomes. MATERIALS AND METHODS: A retrospective chart review was performed to compare perioperative wound complications (up to 120 d postoperatively) between patients who underwent AWR with the human noncrosslinked ADMs Alloderm or Cortiva from January 2012 to March 2020. Surgical technique uniformly consisted of open component separation, onlay implantation of ADM, and progressive tension suture fixation of ADM. RESULTS: After exclusions, 53 patients were in the Alloderm group, and 29 patients were in the Cortiva group. The overall perioperative wound complication rate between Alloderm (51.92%) and Cortiva (72.41%) was not significantly different (P = 0.09921). The average follow-up for Alloderm was 76.69 ± 29.52 d and for Cortiva was 66.93 ± 35.16 d (P = 0.2088). There were no cases that required explantation of ADM. CONCLUSIONS: Given the similar perioperative wound complication profiles, the more cost-effective ADM may be a consideration for use in AWR. The fact that there were zero instances of ADM explantation also supports the use of ADM in these high-risk cases.

The Feasibility of a Sensate Profunda Artery Perforator Flap in Autologous Breast Reconstruction: An Anatomic Study for Clinical Application.

BACKGROUND: The profunda artery perforator (PAP) flap has been demonstrated to be an effective method of autologous breast reconstruction, particularly when the abdominal donor site is contraindicated. However, there are no current reports regarding the use of a sensate PAP flap in this type of reconstruction. The objective of this study is to describe the feasibility and anatomic location of the sensory nerves supplying the PAP flap in relation to surface landmarks for use in autologous breast reconstruction. METHODS: In this anatomic study, 10 cadaver lower limbs were microsurgically dissected. We investigated the posterior femoral cutaneous nerve (PFCN), which supplies sensation to the skin of the posterior thigh and distribution of the PAP flap. The midline of the posterior thigh and gluteal crease were used for surface landmarks. The diameter and length of the nerve branches were documented. RESULTS: There were between 2 and 5 PFCN branches, with an average of 3 branches, that were found within the distribution of the PAP flap. Measurements were taken from the gluteal crease and midline to the nerve branches. The average distance caudal to the gluteal crease was 2.4 cm (0 to 7 cm). The average distance medial to the midline was 4.3 cm (0.2 to 8.1 cm). The average diameter of the nerve branches was 1.8 mm (1 to 2.5 mm). The average length of nerve branches from the flap to the fascia was 2.0 cm (1.5 to 2.4 cm). The maximum length of the nerve branches from the flap to the main trunk of the PFCN was 7.8 cm when tracing the nerve branches intramuscularly. CONCLUSIONS: The findings from this study provide an anatomic basis for the sensate PAP flap that would potentially provide an additional dimension to the use of this perforator flap in autologous breast reconstruction. These preliminary results are promising, and further physiological studies are warranted to validate the use of this sensate flap.

Dermal Autografts in Breast Reconstruction: A Review of Past and Current Trends.

Breast cancer affects 1 in 8 women. As the treatment of breast cancer evolves, breast reconstruction does as well. Implant-based reconstructions are increasing, leading to increased use of acellular dermal matrix (ADM) for better implant positioning. Acellular dermal matrices are derived from cadaveric skin and are processed to be immunologically inert. However, ADM can be costly and can have complications such as seroma and infection. This has led to the development of dermal autografts. These were first used in postmastectomy breast reconstruction in women with redundant breast skin that was deepithelialized and used for lower pole coverage of tissue expanders and implants. This evolved into harvesting dermal autografts from the abdomen. Later studies evaluated the use of meshed dermal autografts. Histological analysis of ADM versus dermal autografts shows that there are increased vessels within dermal autografts compared with ADM. This potentially contributes to the decreased complication rate seen with autografts. In addition, one study showed equivalent results in aesthetic outcomes and capsular contracture between ADM and dermal autograft. Analysis of cost has shown that ADM is significantly more costly than harvesting a dermal autograft. Physician reimbursement is also higher for dermal autografts. This review article seeks to summarize key studies that highlight the feasibility of using dermal autografts in breast reconstruction.

Multipoint Suture Fixation Technique for Abdominal Wall Reconstruction with Component Separation and Onlay Biological Mesh Placement.

Component separation with mesh reinforcement has become the primary modality for complex abdominal wall reconstruction. However, many fundamental questions remain unanswered, such as whether underlay versus overlay mesh placement is superior, and what is the best means of suture fixation technique for mesh placement? This study presents the senior author's technique for onlay biologic mesh placement with multipoint suture fixation in combination with component separation and its subsequent low recurrence rates. This is a retrospective review of the senior author's cases of component separation with onlay biologic mesh placement during his tenure at the home institution of the University of Alabama at Birmingham. A total of 75 patients were included, all of whom underwent complex abdominal wall reconstruction from September 2002 to April 2012. Patients were excluded from the dataset if their surgery occurred less than two years before date of data collection to give a minimum 2-year follow-up. Patients were identified by Current Procedural Terminology codes for component separation and their charts reviewed by the home institution's electronic medical record. Data point entries included patient demographics and comorbidities, concomitant procedures such as bowel resection or panniculectomy, and characteristics of the reconstruction such as type of mesh used. Primary data endpoints were complications following surgery, particularly recurrence and laxity. A total of 75 patients were included in the study from September 2002 to April 2012 with a minimum 2-year follow-up period. The recurrence rate was 13 per cent and the rate of laxity 2.7 per cent. There was one death (1.35%). The most frequent complication was seromas at a rate of 17 per cent. Multipoint fixation suture technique for abdominal wall reconstruction with component separation and onlay biologic mesh is a reproducible technique with reliably low recurrence rates.

Midface anatomy, aging, and aesthetic analysis.

This article reviews the key anatomic structures in the region of the midface, including important surface and bony landmarks, innervation, blood supply, muscle layers, and fat compartments. It also discusses changes in these structures related to the aging process and aesthetic analysis of the midface to aid with operative planning.

Serum albumin levels in burn people are associated to the total body surface burned and the length of hospital stay but not to the initiation of the oral/enteral nutrition.

OBJECTIVE: Serum albumin levels have been used to evaluate the severity of the burns and the nutrition protein status in burn people, specifically in the response of the burn patient to the nutrition. Although it hasn't been proven if all these associations are fully funded. The aim of this retrospective study was to determine the relationship of serum albumin levels at 3-7 days after the burn injury, with the total body surface area burned (TBSA), the length of hospital stay (LHS) and the initiation of the oral/enteral nutrition (IOEN). SUBJECT AND METHODS: It was carried out with the health records of patients that accomplished the inclusion criteria and were admitted to the burn units at the University Hospital of Reina Sofia (Córdoba, Spain) and UAB Hospital at Birmingham (Alabama, USA) over a 10 years period, between January 2000 and December 2009. We studied the statistical association of serum albumin levels with the TBSA, LHS and IOEN by ANOVA one way test. The confidence interval chosen for statistical differences was 95%. Duncan's test was used to determine the number of statistically significantly groups. RESULTS: Were expressed as mean±standard deviation. We found serum albumin levels association with TBSA and LHS, with greater to lesser serum albumin levels found associated to lesser to greater TBSA and LHS. We didn't find statistical association with IOEN. CONCLUSION: We conclude that serum albumin levels aren't a nutritional marker in burn people although they could be used as a simple clinical tool to identify the severity of the burn wounds represented by the total body surface area burned and the lenght of hospital stay.

The potential association of later initiation of oral/enteral nutrition on euthyroid sick syndrome in burn patients.

Objective. The aim of this study was to determine if early initiation of oral/enteral nutrition in burn patients minimizes the drop in fT3 levels, reduces the potential for euthyroid sick syndrome (ESS), and shortens the length of hospital stay (LHS). Subjects and Methods. We retrospectively evaluated the statistical association of serum fT3, fT4, and TSH at the first (2nd-5th day) and second sample collection (9th-12th day) after the burn injury in 152 burn patients. Three groups were established depending on time of initiation of the oral/enteral nutrition: <24 h before the injury (Group 1), 24-48 h after the injury (Group 2), and >48 h after the injury (Group 3). Results. They were expressed as mean ± standard deviation. We found that LHS and the fT3 levels were statistically different in the 3 groups. The LHS (in days) was, respectively, in each group, 16.77 ± 4.56, 21.98 ± 4.86, and 26.06 ± 5.47. Despite the quantifiable drop in fT3, ESS was present only at the first sample collection (2.61 ± 0.92 days) in Group 3, but there was no group with ESS at the second sample collection (9.89 ± 1.01 days). Our data suggest that early initiation of nutritional supplementation decreases the length of hospitalization and is associated with decreasing fT3 serum concentration depression. Conclusion. Early initiation of oral/enteral nutrition counteracts ESS and improves the LHS in burn patients.

Neck rejuvenation--anatomy and clinical correlation.

The restoration of the aesthetic contour of the neck is a challenging but important component of facial rejuvenation. Numerous techniques have been developed to improve the aesthetic outcome. We plan to give an overview of anatomic principles and their clinical correlation.

Mastectomy with breast reconstruction in previously augmented patients: indications for implant removal.

Surgeons performing breast reconstruction in previously augmented patients can either leave the preexisting implant in place and incorporate the implant into the reconstruction, or remove the implant, usually performing an implant exchange. The focus of this study is to identify indications for implant removal in previously augmented patients undergoing mastectomy with breast reconstruction. We performed a retrospective chart review of patients who underwent breast reconstruction from 1997-2007 at University of Alabama, Birmingham Medical Center. Of these patients, 54 had previous augmentation with silicone or saline implants. Twenty-two of these underwent bilateral breast reconstruction, making a total of 76 reconstructed breasts. Patients were followed for a mean of 2.1 years (range 0.1-5.1 years). The mean body mass index was 23.0 (range 18-30). Implants were explanted in all but one patient. Reasons for implant removal or exchange included subglandular position (n = 39), aged silicone implant (n = 50), rupture or leak (n = 24), implant exposure (n = 1), and infection (n = 1). Some patients had more than one reason for explantation. We recommend removal of preexisting implants for patients who have implants in a subglandular position, ruptures or leaks, site infections, implant exposures, capsular contractures, pain, indolent seromas, aged silicone implants, poor cosmesis, plans for or history of radiotherapy, and close proximity of tumor to implant. We also remove implants to respect patient preferences and to achieve symmetry in our reconstruction. Consequently, we find in our practice that most of previously augmented patients who undergo breast reconstruction will also undergo implant removal.

Immediate nipple reconstruction on a free TRAM flap breast reconstruction.

BACKGROUND: Reconstruction of the nipple-areola complex is usually deferred until breast mound reconstruction is complete. The authors review their experience with a technique that allows for shaping of a free transverse rectus abdominis myocutaneous (TRAM) flap and immediate nipple reconstruction and compare this technique with delayed nipple reconstruction. METHODS: A retrospective chart review demonstrated 21 patients who underwent immediate nipple reconstruction, 10 of whom had complete photographs and records for review. Ninety patients underwent delayed nipple reconstruction. Twenty of these patients were chosen for comparison, 15 of whom had complete photographs and records. Age, body mass index, comorbidities, procedures required, complications, and time to completion were reviewed. A multiobserver, multicharacteristic, standardized photographic review of cosmetic outcomes was conducted. RESULTS: Time from mastectomy to completion of reconstruction, not including areolar tattooing, was 1 day (median) versus 125 days (median) in the immediate and delayed groups, respectively (p = 0.003). The number of procedures required to complete reconstruction before areolar tattooing was one (median) in the immediate group and two (median) in the delayed group (p < 0.001). Complication rates were similar in both groups. Subjective review demonstrated no difference in the aesthetic outcome of the breast mound or nipple-areola complex reconstruction. CONCLUSIONS: Patients having immediate nipple reconstruction in the setting of a free TRAM breast reconstruction completed their reconstruction earlier, required fewer procedures, and had aesthetic results comparable to patients having traditional delayed nipple reconstruction. Complications and revision rates were comparable.

Utilization of human cadaveric acellular dermis for abdominal hernia reconstruction.

BACKGROUND: Incisional hernias with history of recurrence or infection remain a challenge, with high postoperative morbidity and recurrence rates. The purpose of this study is to evaluate outcomes of patients treated with human cadaveric acellular dermis as an adjunct to abdominal wall reconstruction. METHODS: We retrospectively reviewed 39 abdominal wall reconstructions with human cadaveric acellular dermis performed in 37 patients and compared them with 39 randomly selected cases. RESULTS: There is a significant decrease in recurrence rates when human cadaveric acellular dermis is added as an overlay to primary closure plus rectus muscle advancement and imbrication in patients with medium-sized hernias. No differences were observed when adding human cadaveric acellular dermis as an overlay to patients with large-size hernias treated with underlay mesh. The use of human cadaveric acellular dermis did not increase postoperative morbidity rates. CONCLUSIONS: Improved results with human cadaveric acellular dermis are obtained by achieving tension-free repairs.

Strategies to enhance transductional efficiency of adenoviral-based gene transfer to primary human fibroblasts and keratinocytes as a platform in dermal wounds.

Genetically modified keratinocytes and fibroblasts are suitable for delivery of therapeutic genes capable of modifying the wound healing process. However, efficient gene delivery is a prerequisite for successful gene therapy of wounds. Whereas adenoviral vectors (Ads) exhibit superior levels of in vivo gene transfer, their transductional efficiency to cells resident within wounds may nonetheless be suboptimal, due to deficiency of the primary adenovirus receptor, coxsackie-adenovirus receptor (CAR). We explored CAR-independent transduction to fibroblasts and keratinocytes using a panel of CAR-independent fiber-modified Ads to determine enhancement of infectivity. These fiber-modified adenoviral vectors included Ad 3 knob (Ad5/3), canine Ad serotype 2 knob (Ad5CAV-2), RGD (Ad5.RGD), polylysine (Ad5.pK7), or both RGD and polylysine (Ad5.RGD.pK7). To evaluate whether transduction efficiencies of the fiber-modified adenoviral vectors correlated with the expression of their putative receptors on keratinocytes and fibroblasts, we analyzed the mRNA levels of CAR, alpha upsilon integrin, syndecan-1, and glypican-1 using quantitative polymerase chain reaction. Analysis of luciferase and green fluorescent protein transgene expression showed superior transduction efficiency of Ad5.pK7 in keratinocytes and Ad5.RGD.pK7 in fibroblasts. mRNA expression of alpha upsilon integrin, syndecan-1 and glypican-1 was significantly higher in primary fibroblasts than CAR. In keratinocytes, syndecan-1 expression was significantly higher than all the other receptors tested. Significant infectivity enhancement was achieved in keratinocytes and fibroblasts using fiber-modified adenoviral vectors. These strategies to enhance infectivity may help to achieve higher clinical efficacy of wound gene therapy.