Use of Ambient Light Compatible Fluorescence-Guided Surgical Technology for Objective Assessment of Flap Perfusion in Autologous Breast Reconstruction.

BACKGROUND: Decreased autologous flap vascular perfusion can lead to secondary procedures. Fluorescence angiography during surgery reduces the probability of repeat surgery but suffers from interpretation variability. Recently, the OnLume Avata System was developed, which evaluates real-time vascular perfusion in ambient light. This study aims to predict complications in autologous breast reconstruction using measures of relative intensity (RI) and relative area (RA). METHODS: Patients undergoing autologous breast reconstruction underwent intraoperative tissue perfusion assessment using the OnLume Avata System. Post-hoc image annotation was completed by labeling areas of the flap interpreted to be "Well Perfused," "Questionably Perfused," and "Under Perfused." RIs and RAs were calculated for the marked areas. Primary complications of interest were overall complication rate, fat and mastectomy skin flap necrosis, and surgical revision. Logistic regression was applied to determine the odds of developing a complication based on RI and RA for each image. RESULTS: A total of 25 patients (45 flaps) were included. In total, 17 patients (68%) developed at least one complication. Patients who developed any complication (p = 0.02) or underwent a surgical revision for complications (p = 0.02) had statistically lower RI of under-perfused portions of the flap. Patients with greater areas of under-perfused flap had a significantly higher risk of developing fat necrosis (odds ratio [OR]: 5.71, p = 0.03) and required a revision operation (OR: 1.10, p = 0.01). CONCLUSION: Image-based interpretation using the OnLume Avata System correlated with the risk of developing postoperative complications that standard fluorescence imaging systems may not appreciate. This information can benefit surgeons to improve perfusion assessment and intraoperative decision-making.

Predicting Nipple Necrosis with a "Lights-on" Indocyanine Green Imaging System: A Report of Two Patients.

Nipple-areolar complex (NAC) necrosis is a devastating complication in nipple-sparing mastectomies (NSMs) that significantly impacts patient's quality of life. The use of fluorescence angiography for intraoperative assessment of mastectomy skin flap perfusion in NSM has been successfully described and can be utilized to help guide surgical decision-making. Recently, a novel fluorescence-guided surgical imager was developed, OnLume Avata System (OnLume Surgical, Madison, WI), which provides intraoperative evaluation of vascular perfusion in ambient light. In this case report, we describe the use of OnLume fluorescence-guided surgery technology to help aid in clinical decision-making for two breast reconstruction cases with concern for intraoperative nipple hypoperfusion.

Livestreaming Microsurgery Education: An Avenue to Expand Global Plastic Surgery.

Microsurgery is a complex subspecialty requiring fine manual dexterity and a thorough understanding of microsurgical techniques, requiring years of training to reach proficiency. On a global scale, trainees may not have access to a longitudinal microsurgery curriculum and instead attend brief courses to learn microsurgical techniques, limiting their ability to practice the nuances of microsurgery. There remains a gap in global microsurgical education for trainees to have consistent educational exposure. This article presents a novel and easy to use software-based microsurgical system for virtual microsurgical teaching. In doing so, this system provides a free-of-cost and highly accessible avenue to deliver consistent microsurgical education worldwide.

Heterotopic Auxiliary Whole Liver Rat Transplant Model Utilizing a Hepaticoureterostomy for Allograft Rejection Studies.

Small animal transplant models are indispensable for organ tolerance studies investigating feasible therapeutic interventions in preclinical studies. Rat liver transplantation (LTx) protocols typically use an orthotopic model where the recipients' native liver is removed and replaced with a donor liver. This technically demanding surgical procedure requires advanced micro-surgical skills and is further complicated by lengthy anhepatic and lower body ischemia times. This prompted the development of a less complicated heterotopic method that can be performed faster with no anhepatic or lower body ischemia time, reducing post-surgery stress for the recipient animal. This heterotopic LTx protocol includes two main steps: excising the liver from the donor rat and transplanting the whole liver into the recipient rat. During the excision of the donor liver, the surgeon ligates the supra-hepatic vena cava (SHVC) and hepatic artery (HA). On the recipient side, the surgeon removes the left kidney and positions the donor liver with the portal vein (PV), infra-hepatic vena cava (IHVC), and bile duct facing the renal vessels. Further, the surgeon anastomoses the recipient's renal vein end to end with the IHVC of the liver and arterializes the PV with the renal artery using a stent. A hepaticoureterostomy is utilized for biliary drainage by anastomosing the bile duct to the recipient's ureter, permitting the discharge of bile via the bladder. The average duration of the transplantation was 130 min, cold ischemia duration was around 35 min, and warm ischemia duration was less than 25 min. Hematoxylin and eosin histology of the auxiliary liver from syngeneic transplants showed normal hepatocyte structure with no significant parenchymal alterations 30 days post-transplant. In contrast, 8-day post-transplant allogeneic graft specimens demonstrated extensive lymphocytic infiltration with a Banff Schema rejection activity index score of 9. Therefore, this LTx method facilitates a low morbidity rejection model alternative to orthotopic LTx.

Surgical management of adult acquired buried penis syndrome: A systematic review of patient-reported outcome instruments.

PURPOSE: Adult acquired buried penis (AABP) is a morbid condition often necessitating surgical intervention. Accurate assessment of pre- and postoperative symptoms is crucial to understand how AABP impacts a patients' quality of life, verify surgical effectiveness, and practice patient-centered care. There is no validated patient-reported outcome instrument specific for AABP evaluation. We undertook a comprehensive review of existing literature on patient-reported outcome instruments post-AABP surgery to highlight the importance of developing a specific tool. METHODS: Following the preferred reporting items for systematic reviews and meta-analysis 2020 guidelines, we queried three databases using relevant keywords (e.g., "buried penis repair"). Inclusion criteria were studies that discussed surgical management of AABP with patient-reported outcomes. Pediatric and congenital cases were excluded. Information collected included study design, level of evidence, number of participants included in the study, etiology of buried penis, surgical technique, preoperative or postoperative patient-reported outcomes, and patient-reported outcome instrument used. RESULTS: Initial query identified 998 records. After abstract screening and applying the inclusion or exclusion criteria, a total of 19 articles with 440 patients were included. Eight studies implemented patient-reported outcome instruments. The international index of erectile dysfunction-5 and Likert satisfaction scales were used most frequently. Although all instruments were validated, none were validated in the specific context of AABP surgical intervention. CONCLUSIONS: There is considerable heterogeneity within the AABP literature regarding patient symptomatology, postoperative complications, patient-reported outcomes, and instruments used. The results of this study emphasize the need for a patient-reported outcome measure to examine the influence of AABP repair on patient satisfaction and health-related quality of life.

Perforator Dissection Porcine Abdominal Model: A Novel Simulator to Improve Microsurgical Training.

BACKGROUND: Perforator dissection and flap elevation are routinely performed for microsurgical reconstruction; however, there is a steep learning curve to mastering these technical skills. Though live porcine models have been utilized as microsurgical training models, significant drawbacks limit their use. We recently developed a latex-perfused, nonliving, porcine abdomen perforator dissection simulation and described its anatomic similarity to the human deep inferior epigastric artery flap. The purpose was to assess the change in resident confidence in performing key operative steps of flap elevation and perforator dissection and obtain feedback on model realism and utility. METHODS: Seventeen plastic and reconstructive surgery resident physicians (postgraduate years 1-6) at a single institution participated in a perforator dissection session utilizing the simulation model. Each resident completed pre- and postactivity surveys to assess interval change in confidence in operating. The postactivity survey also asked residents to answer questions regarding their perception of the model's anatomic and surgical realism and utility in microsurgical training. RESULTS: Following a practice session using the latex-perfused, nonliving porcine abdomen, resident confidence was significantly increased in performing all key operative steps and the procedure overall (p = 0.001). All residents (n = 17, 100%) believed the model would improve "trainees' ability to perform perforator dissection in the operating room." Perforator, fascial, and pedicle anatomy were reported to be "Very" similar to human anatomy, with a median Likert score (MLS) of 4. Additionally, six out of the eight surgical steps were noted to be "Very" realistic, with only "Flap Design" and "Fascial Closure" found to be "Moderately" realistic with an MLS of 3. CONCLUSION: The latex-infused porcine abdominal model is a novel, realistic simulation for microsurgical trainee perforator dissection practice. This model offers a suitable substitute for perforator dissection practice, as its implementation within a microsurgery training course improves resident comfort and confidence.

From Tip of Brush to Tip of Knife: The Relationship Between Post-Mastectomy Breast Reconstruction and the Classical Arts.

Breast reconstruction is highly complex, requiring navigation of not only clinical and operative realities, but of patient expectations as well. The authors sought to identify historical art pieces that exhibit breast asymmetries and deformities for comparison with photos of breast reconstruction patients seen at the clinic of the senior author to demonstrate that achievement of perfect breast cosmesis is challenging in both breast reconstruction as well as in the classical arts. Open access libraries and Creative Commons images were reviewed to identify appropriate works of art from various time periods and geographic locations. Following artwork selection, photos of breast reconstruction patients were reviewed and paired with selected artworks exhibiting cosmetically similar breasts. A total of 9 pieces of selected historic art were found to have at least one matching patient photo, with 11 correlative patient photos ultimately chosen. Common breast asymmetries and deformities identified included ptosis, asymmetric chest wall placement, asymmetric nipple placement, and absence of the nipple. This review identified diverse artworks of varying styles spanning vast expanses of both geography and time that exhibit breast deformities and asymmetries commonly encountered in patients seeking revision of breast reconstruction. This underscores that creating the cosmetically ideal breast is difficult both in the operating room and the art studio. Importantly, the authors emphasize that the arts frequently celebrate that which is considered beautiful, though to the trained eye of a plastic surgeon, that which is considered beautiful, is often classified as dysmorphic or asymmetric.

Latex-Infused Porcine Abdominal Model: A Novel Microsurgery Simulator for Deep Inferior Epigastric Perforator Dissection.

BACKGROUND: Perforator dissection and flap elevation are routinely performed for microsurgical reconstruction; however, there is a steep learning curve to mastering these technical skills. Though live porcine models have been utilized as a microsurgical training model, there are significant drawbacks that limit their use, including cost, limited ability for repetition, and obstacles associated with animal care. Here we describe the creation of a novel perforator dissection model using latex augmented non-living porcine abdominal walls. We provide anatomic measurements that demonstrate valuable similarities and differences to human anatomy to maximize microsurgical trainee practice. METHODS: Six latex-infused porcine abdomens were dissected based on the deep cranial epigastric artery (DCEA). Dissection was centered over the abdominal wall mid-segment between the second and fourth nipple line. Dissection steps included exposure of lateral and medial row perforators, incision of anterior rectus sheath with perforator dissection, and dissection of DCEA pedicle. DCEA pedicle and perforator measurements were compared with deep inferior epigastric artery (DIEA) data in the literature. RESULTS: An average of seven perforators were consistently identified within each flap. Assembly of the model was performed quickly and allowed for two training sessions per specimen. Porcine abdominal walls demonstrate similar DCEA pedicle (2.6 ± 0.21 mm) and perforator (1.0 ± 0.18 mm) size compared with a human's DIEA (2.7 ± 0.27 mm, 1.1 ± 0.85 mm). CONCLUSION: The latex-infused porcine abdominal model is a novel, realistic simulation for perforator dissection practice for microsurgical trainees. Impact on resident comfort and confidence within a microsurgical training course is forthcoming.

Trigeminal or peripheral nerve stimulation improves functional outcomes of nerve recovery in a rodent forelimb gap repair model.

BACKGROUND: The hypothesis of this study was that trigeminal nerve stimulation (TNS) or peripheral nerve stimulation (PNS) could improve functional outcomes of peripheral nerve injury in a rat forelimb model when compared to control rats not receiving electrical stimulation (ES). While PNS is known to improve outcomes after nerve surgery, the role of TNS has not been explored. METHODS: Lewis rats were trained to perform a reach and grasp task before receiving a 2 mm gap repair of the ulnar and median nerves and randomized into four treatment groups: (1) sham injury, (2) nerve injury with sham ES, (3) nerve injury with PNS, and (4) nerve injury with TNS. Functional motor (median pull force and percent success in motor task) and sensory metrics (forelimb paw withdrawal thresholds) were collected both pre-injury and throughout rehabilitation. Nerves stained using Gomori's trichrome were assessed quantitatively and qualitatively. RESULTS: The sham ES group did not recover their pre-injury baseline functional outcomes. In contrast, the TNS and PNS groups fully recovered following injury, with no difference in functional outcomes between the pre-injury baseline and the final week of rehabilitation (P > 0.05, all). Histomorphology results demonstrated no quantitative difference, but qualitative differences in architecture were evident. CONCLUSIONS: Electrical stimulation of the trigeminal nerve or the injured nerve improved the functional outcomes of nerve regeneration in rodents. Histomorphology results of nerves from the TNS group support the proposed central mechanisms. This is an important step in translating this therapy as an adjunct, non-invasive treatment for high, mixed nerve injuries in humans.

Modified Frailty Index predicts postoperative complications following adult-acquired buried penis surgery: A retrospective cohort study.

BACKGROUND: Given that patients with morbid obesity are predisposed to frailty, we sought to determine whether the 5-Factor Modified Frailty Index (mFI-5) predicts postoperative complications following surgery for adult-acquired buried penis, and secondarily, to compare the mFI-5 to body mass index (BMI) and American Society of Anesthesiologists (ASA) status as preoperative risk stratification measures. METHODS: We included all patients who underwent surgical management for adult-acquired buried penis at an academic Level I trauma center between 2015 and 2023. A manual chart review was performed to collect data on patient demographics, modified frailty index variables, intraoperative data, postoperative outcomes, and complications. RESULTS: A total of 55 patients underwent surgical repair of adult-acquired buried penis, with 26 experiencing postoperative complications (47.3%). Univariable regression analyses revealed that the mFI-5 was a significant predictor of postoperative complications (odds ratio [OR] 3.40, 95% confidence interval [CI]: 1.56-7.42, p = .002), ongoing postoperative urinary problems (OR 2.03, 95% CI: 1.02-4.05, p = .045), patient dissatisfaction with outcomes (OR 3.29, 95% CI: 1.35-8.02, p = .009), and persistent postoperative symptoms (OR 2.42, 95% CI: 1.10-5.35, p = .029). There was no significant association between ASA classification and postoperative complications (OR 1.59, 95% CI:.544-4.63, p = .398). Multivariable analysis demonstrated that the mFI-5 was an independent predictor of postoperative complications (OR 5.34, 95% CI: 1.80-15.9, p = .003) when controlling for BMI and age. CONCLUSION: The mFI-5 is an independent predictor of postoperative complications in patients undergoing surgical repair of adult-acquired buried penis. The simplicity of the index permits efficient preoperative risk stratification of adult-acquired buried penis patients and provides important counseling information that may not be reflected by age or BMI alone.

Management of common conditions of the musician: a narrative review for plastic surgeons.

Career-related injuries and disorders in professional musicians are prevalent across all their respective instruments and fields. They often endure long hours of intensive practice that demand high levels of precision, dexterity, and flexibility of their head, neck, hands, and upper extremities. Unlike the average patient, musicians are sensitive to even mild symptoms and deficits that can interfere with performance, which can potentially be career-threatening. Increasing attention to the care of musicians motivated performing arts medicine to tailor the practice to their individual and unique needs. Plastic surgeons are at the forefront of this practice; however, there are very limited reviews discussing plastic surgery management of the common injuries and disorders in musicians. This article reviews the most relevant literature of the past several decades regarding treatment modalities of the most common conditions endured by professional instrumentalists, with an emphasis on surgical considerations in the field of plastic surgery. A thorough literature search was performed for articles that encompass the interface between plastic surgery and musicians. We examined disorders of the head, ears, eyes, nose, throat, hands, and upper extremities including stress velopharyngeal incompetence, disruption of the embouchure, nerve entrapments, arthritis, traumatic injuries, focal dystonia, Linburg-Comstock syndrome, and overuse disorder. Overall, the goal of this review is to provide a summary of the existing and successful procedures performed to address prevalent musician conditions.

Surgeon or Bot? The Risks of Using Artificial Intelligence in Surgical Journal Publications.

Mini-Abstract ChatGPT is an artificial intelligence (AI) technology that has begun to transform academics through its ability to create human-like text. This has raised ethical concerns about its assistance in writing scientific literature. Our aim is to highlight the benefits and risks that this technology may pose to the surgical field.

Database Tracking in Gender-Affirming Surgery: Are Patients Falling Through the Cracks?

BACKGROUND: This study sought to examine risk factors for venous thromboembolism in transfeminine vaginoplasty. Secondarily, the authors outline reasons why patients are not adequately classified for research purposes despite using relevant queried codes. METHODS: Transgender patients undergoing vaginoplasty were identified with diagnostic and procedure-specific codes using a national surgical database from 2010 through 2019. RESULTS: There were 457 transgender vaginoplasties performed, with 24 wound dehiscences, 17 unplanned reoperations, and 12 surgical site infections. With zero cases of venous thromboembolism, risk factor analysis was deferred. CONCLUSIONS: Heterogeneity in coding practices for gender-affirming surgery led to an uncharacteristically small cohort of transfeminine vaginoplasty patients captured in the database. Current diagnostic and procedure-specific codes are nonspecific and unbundled, hindering accurate assessment of the incidence of standard surgical complications.

"Postoperative Outcomes Following Buried Penis Reconstruction: A Single-Institution Experience Using the Wisconsin Classification System".

BACKGROUND: Adult acquired buried penis (AABP) is a complex condition often necessitating surgical intervention. This study seeks to examine the validity of the Wisconsin Classification System (WCS) in guiding the surgical management of AABP. Additionally, we aimed to identify which factors contribute to postoperative complications and persistent symptoms following AABP repair. METHODS: We retrospectively reviewed all patients who underwent surgical repair of AABP from 2015-2021 by the senior author at our institution. Patients were categorized according to anatomic characteristics using the WCS. Preoperative symptoms, postoperative symptoms, and postoperative complications were evaluated. RESULTS: Fifty-two patients underwent AABP repair. The mean age was 56.5±14.8 years, and the mean duration of follow-up was 350.0±517.4 days. The assigned preoperative WCS score was congruent with operative management in most patients (86.0%). Morbid obesity (BMI>40.0kg/m2) and postoperative complications were associated with persistent symptoms following AABP repair (p=0.026 and p=0.021, respectively). Increased WCS score was not associated with persistent postoperative symptoms (p=0.314). Morbid obesity (p=0.003), diabetes (p=0.029) and having a panniculectomy during AABP repair (p=0.046) increased the odds for developing postoperative complications. Patients with Type I AABP had significantly fewer complications than those with Type II, III, or IV (p=0.032). CONCLUSIONS: The Wisconsin Classification System serves as a preoperative guide, an educational tool for patients, and provides a framework for the discussion of intraoperative maneuvers and the likelihood of complications. It is imperative to counsel patients on the surgical management of AABP and the postoperative course, as this may permit realistic patient expectations and optimize outcomes.

The nuances of abdominal free flap harvest: Technical and patient factors affecting abdominal donor site morbidity in autologous breast reconstruction.

INTRODUCTION: Abdominal donor site morbidity after autologous breast reconstruction is common and often underreported. This work aims to compare prospectively collected technical details of the procedure and patient factors and their impact on the development of symptomatic and asymptomatic abdominal bulges (ASB and SB). METHODS: A review of patients undergoing abdominal-based autologous breast reconstruction from May 2012 to October 2017 by two surgeons at a single institution was performed. Demographics, prior medical and surgical history, intraoperative data, and postoperative course were collected. Primary outcomes of interest were ASB or SB and wound healing complications. RESULTS: Overall, 196 free flaps from 117 patients were included. The average follow-up was 1.9 ± 1.7 years. Thirteen (11.1%) patients developed ASB, and 13 (11.1%) patients developed SB. Patients with BMI ≥ 30, bilateral ms-TRAM reconstruction, and an onlay type of abdominal closure were 2×, 2.3×, and 8.1× more likely to develop a bulge, respectively (p = 0.017, p = 0.010, p = 0.049). Every one-point increase in BMI above 30 increased the odds of developing a bulge by 10.8%. Prior abdominal surgery increased the risk of SB by 7-fold (p = 0.017). The size of the harvested muscle, use of mesh, or nerve preservation did not affect the rate of bulge development. CONCLUSION: High BMI, bilateral ms-TRAM, onlay type of abdominal closure, and prior abdominal surgery increase the risk of ASB and SB development to varying degrees, while several other operative variables did not seem to make a difference. Breast reconstruction patients can use this information for preoperative counseling and intraoperative decision-making.

Evaluation of a Full-Time Microsurgeon Educator on Resident Training, Research Collaboration, and Grant Funding.

BACKGROUND: The value of a fully trained microsurgeon dedicated to a laboratory setting at an academic institution is largely unknown. Microsurgery training lacks a national standard despite its highly complicated nature. Our study aims to evaluate the impact of a single laboratory-dedicated microsurgeon on the microsurgical training of integrated plastic surgery residents and collaborative efforts in research. METHOD: We devised a three-faceted microsurgical training curriculum, including a collaborative multi-institutional microsurgery course, novel high-fidelity simulator models, and a dedicated microsurgeon. We cataloged grant funding achieved through support to other divisions' protocols. Time, in hours, spent on training and the number of anastomoses completed with the microsurgical educator in a laboratory setting over a 4-year period (2017-2021) were evaluated. Resident independence scores were collected from attending microsurgeons to quantify the translation of microsurgical training. RESULTS: Purchasing and maintenance costs of rats in our rodent facility decreased by $16,533.60 as 198 rats were replaced by our models. The residents who participated in our novel microsurgical training program were able to independently perform anastomoses in the OR by their postgraduate year 6. Additionally, the surgical support offered by our laboratory-dedicated microsurgeon led to a total of $24,171,921 in grant funding between 2017 and 2020. CONCLUSION: Hiring an expert microsurgical educator to train residents in a laboratory has proved promising in accelerating microsurgical mastery. Novel training modules, alternatives to animal models, save resources in housing and animal costs. The addition of a research-oriented-microsurgeon has improved collaborative efforts to advance a range of surgical fields.

Vagus nerve stimulation in the non-human primate: implantation methodology, characterization of nerve anatomy, target engagement and experimental applications.

BACKGROUND: Vagus nerve stimulation (VNS) is a FDA approved therapy regularly used to treat a variety of neurological disorders that impact the central nervous system (CNS) including epilepsy and stroke. Putatively, the therapeutic efficacy of VNS results from its action on neuromodulatory centers via projections of the vagus nerve to the solitary tract nucleus. Currently, there is not an established large animal model that facilitates detailed mechanistic studies exploring how VNS impacts the function of the CNS, especially during complex behaviors requiring motor action and decision making. METHODS: We describe the anatomical organization, surgical methodology to implant VNS electrodes on the left gagus nerve and characterization of target engagement/neural interface properties in a non-human primate (NHP) model of VNS that permits chronic stimulation over long periods of time. Furthermore, we describe the results of pilot experiments in a small number of NHPs to demonstrate how this preparation might be used in an animal model capable of performing complex motor and decision making tasks. RESULTS: VNS electrode impedance remained constant over months suggesting a stable interface. VNS elicited robust activation of the vagus nerve which resulted in decreases of respiration rate and/or partial pressure of carbon dioxide in expired air, but not changes in heart rate in both awake and anesthetized NHPs. CONCLUSIONS: We anticipate that this preparation will be very useful to study the mechanisms underlying the effects of VNS for the treatment of conditions such as epilepsy and depression, for which VNS is extensively used, as well as for the study of the neurobiological basis underlying higher order functions such as learning and memory.