The vascular territories (angiosomes) of the body: experimental study and clinical applications

The Role of Perforator Island Flaps for the Reconstruction of Mid-Facial and Periorbital Large and Deep Defects

PURPOSE

To describe a single-hospital experience with the reconstruction of broad and deep periorbital defects with perforator island flaps (PIFs).

METHODS

Twenty cases of reconstruction of complex defects in the periocular region using PIF were selected and revised. All cases were performed in the university hospital of the University of São Paulo, Ribeirão Preto, Brazil, from September 2018 to July 2024. Data collected included intraoperative and postoperative photographic documentation, lesions diagnoses, defect sizes and locations, PIF sizes and axes of mobilization, postoperative follow-up duration, and complications.

RESULTS

All patients underwent periorbital reconstruction with PIF after tumor resection. In 7 cases, the defects involved the lower lid cheek junction, and in 10 cases, they extended into the medial canthus, including 3 cases of orbital exenteration. The lateral periorbital region was affected in 2 patients. The mobilization of the flaps was from the lower cheek toward the lower eyelid in 7 patients, toward the medial canthal area in 10 patients, and horizontally to cover defects in the medial and temporal regions in 2 cases. The size of the resultant defect averaged 7.9 cm2. The mean follow-up time was 40 months. The flap remained viable in 100% of cases.

CONCLUSION

PIFs are a versatile option for reconstructing large periorbital defects and extended exenterations, and this technique should be included in the repertoire of procedures for managing mid-facial tumors.

Infrared monitoring-based optimization of interventional lumbar sympathectomy outcomes evaluation in peripheral vascular disease patients: Experimental trial thermovision-guided lumbar sympathectomy

Chronic limb-threatening ischemia (CLTI) is associated with significant mortality and limb loss. The interventional lumbar sympathectomy (LS) is one of the supportive treatment options for CLTI patients, reducing pain intensity and peripheral arterial resistance. The use of LS has gradually declined despite its positive effects. The contradictory results of studies dealing with evidence of tissue perfusion improvement after LS are one of the possible explanations. We describe a new approach for the evaluation of LS efficacy in 2 CLTI patients and below-the-knee arteries pathology in our observational cohort experimental trial. We utilized the angiosome concept of foot. Angiography identified angiosomes with occluded source artery. The relationship between angiosomes and corresponding surface areas of angiosomes-dermatomes was identified. The infrared thermography was used for the measurement of thermal changes in dermatomes before and after LS. Based on the thermal changes in dermatomes and the relationship between angiosomes and their dermatomes, we estimated perfusion in angiosomes after the LS procedure. We found that the clinically relevant increase in temperature (>1°C) was presented only in dermatomes corresponding to angiosomes with occluded source artery. We hypothesize that LS opens up anastomoses between angiosomes, resulting in redistribution of blood flow between angiosomes that is associated with an increase in temperature in angiosomes with occluded source artery.

Exosomes in Skin Flap Survival: Unlocking Their Role in Angiogenesis and Tissue Regeneration

This review explores the critical role of exosomes in promoting angiogenesis, a key factor in skin flap survival. Skin flaps are widely used in reconstructive surgery, and their survival depends heavily on the formation of new blood vessels. Exosomes, small extracellular vesicles secreted by various cells, have emerged as important mediators of intercellular communication and play a crucial role in biological processes such as angiogenesis. Compared to traditional methods of promoting angiogenesis, exosomes show more selective and targeted therapeutic potential as they naturally carry angiogenic factors and can precisely regulate the angiogenesis process. The review will delve into the molecular mechanisms by which exosomes facilitate angiogenesis, discuss their potential therapeutic applications in enhancing skin flap survival, and explore future research directions, particularly the challenges and prospects of exosomes in clinical translation. By highlighting the unique advantages of exosomes in skin flap survival, this review provides a new perspective in this field and opens up new research directions for future therapeutic strategies.

Angiosome-Guided Revascularization in Local Flap Reconstruction of the Foot and Ankle: Comparable Outcomes With Both Direct and Indirect Revascularization

BACKGROUND

Among patients with critical limb ischemia and tissue loss, revascularization is an essential component for limb salvage. Local flaps of the foot and ankle remain a versatile tool in reconstructive limb salvage but is dependent on adequate arterial flow. In patients with arterial occlusive disease requiring revascularization, there is a lack of evidence in the current literature investigating on the necessity of direct arterial flow to the respective angiosome for local flaps reconstruction. Our study thereby compares the outcomes of direct (DR) and indirect (IR) revascularization for local flap success.

METHODS

Patients who received endovascular revascularization (ER) prior to local flap reconstruction for chronic wounds in the foot and ankle were retrospectively reviewed. IR was performed in patients where DR could not be performed. DR was defined as an intervention on the same pedicle used for the local flap. IR was defined as an intervention performed on a different angiosome than the pedicle used for the local flap. Patient demographics, Charlson Comorbidity Index (CCI), angiographic details, postoperative complications, and long-term outcomes were collected.

RESULTS

A total of 33 patients underwent 43 local flap reconstruction with preoperative ER: 58.1% (n = 25) received DR and 41.2% (n = 18) received IR. Patients had a mean CCI of 6.7 ± 1.8, with a high prevalence of diabetes mellitus (93.9%), peripheral arterial disease (90.9%), and end-stage renal disease (33.3%) with no significant differences between groups. In the immediate postoperative period (postoperative day 0 to 12), there were no significant differences in immediate flap success (DR: 100% vs IR: 88.9%, P = 0.169) or partial flap necrosis between (DR: 0.0% vs IR: 16.7%, P = 0.066). Rates of major complications from infection (DR: 28.2% vs IR: 22.2%, P = 0.736), ischemia (DR: 4.0% vs IR: 11.1%, P = 0.562), or dehiscence (DR: 8.0% vs IR: 16.7%, P = 0.634) requiring reoperation were similar between 2 groups. Overall limb salvage rate was 84.9%, and comparable between groups (DR: 78.6% vs IR: 89.5%, P = 0.628).

CONCLUSIONS

DR and IR achieve similar rates of limb salvage and flap success after local flap reconstruction. A multidisciplinary vasculo-plastic approach that incorporates preoperative arteriogram and revascularization should be utilized for this highly comorbid patient population to achieve optimal success and limb salvage.

The Freestyle Multiperforator Island Flap: Beyond the Keystone Flap

Background

This study aimed to introduce freestyle multiperforator island flaps as a technical advancement beyond keystone perforator flaps. These flaps represent a fully free-design approach, supplied by multiperforators in small subcutaneous pedicles randomly located, allowing for customized designs tailored to anatomical regions of diverse complexity.

Methods

We present a retrospective cohort study of 150 patients with coverage defects, without distinction of anatomical location or age, treated between 2012 and 2021. The study assessed the clinical presentation, flap characteristics, additional procedures, and postoperative outcomes. We used the chi-square test to assess the relationship between pedicle area size and the incidence of partial or complete necrosis.

Results

We performed 211 flaps on 184 defects, with a mean follow-up of 8.7 months. Tumors (30.4%) and trauma (23.3%) were the most common etiologies. Most flaps were performed on the head and neck (31%) and lower limbs (30.4%). The mean pedicle area was 33%, and the flap-to-defect size ratio was between 1:1 and 3:1 in 82% of cases. Complications occurred in 29.8% of the flaps, with only 8.1% needing surgical reintervention. The most common occurrences were dehiscence (18.5%), partial necrosis (9%), and total necrosis (1.9%). The pedicle area of the flap did not demonstrate a statistically significant relationship with the necrosis outcome (P = 0.813; 95% confidence interval, 0.17-0.926).

Conclusions

Freestyle multiperforator island flaps are a safe and versatile tool with low necrosis rates, excellent aesthetic results, and unmatched cost-effectiveness.

Morphological Investigation of Superficial Fascia Relationships With the Skin and Underlying Tissues in the Canine Hindlimb

The morphology of the superficial fascia in the canine hindlimb is still poorly understood and incompletely described. The present study aimed to elucidate the macroscopic and microscopic structures of the superficial fascia, thereby clarifying its functional role. Cadavers were investigated for anatomic description (N = 38), ultrasonic scanning (N = 2), and histological analyses (N = 10) of this tissue in the hindlimb. The superficial fascia was identified as a shiny, white fibroelastic layer that adhered to the skin through fibrous septa. It was organized into sublayers enveloping the cutaneous muscle and large blood vessels. In certain areas, superficial fascia fused with the deep fascia or skin, creating fascial bursae. These bursae included the ischiatic bursa, an iliac bursa, a prepatellar subfascial bursa, a prepatellar subcutaneous bursa, and the tarsal fascial bursa. Microscopically, the superficial fascia presented as a layer of dense connective tissue characterized by irregularly arranged collagen and elastic fibers. The superficial fascia was firmly attached to the skin and deep fascia by numerous fibrous tissue strands. Within both, the superficial fascia and fascial bursae, several mechanoreceptors and nerve endings were identified, including Ruffini's corpuscles, Pacinian corpuscles, and Golgi-Mazzoni corpuscles. The organization of the superficial fascia and its attachments suggest a mechanical role in supporting structures and resisting loads during movement. The fibrous septa anchors fascia to the skin, providing stability and resistance against external forces, as well as protecting the nerves and blood vessels that pass towards the skin. Existing fascial bursae probably assist in decreasing pressure and facilitating freedom of movement adjacent to bony prominences. Elasticity and connectivity of the superficial fascia may explain the various responses to multidirectional loading. Furthermore, the presence of free nerve endings and mechanoreceptors within the fascia suggests that it may contribute to proprioception of the hindlimb, enhancing the awareness of body movement.

The vascular supply to the lateral compartment of the leg with emphasis on fibular flap harvesting

PURPOSE

The aim of this study is to determine the exact locations of vascular pedicles that supply the fibularis longus and brevis, to identify the morphometric features of those vessels in the lateral compartment of the leg, and to indicate the branching points of the pedicles from the main arteries.

METHODS

The popliteal arteries of 40 lower limbs from 20 adult cadavers (12 males, 8 females) were bilaterally injected with colored latex. After dissection, the branches of the arteries were identified and counted. The distances between the apex of the head of the fibula and the branching points of the anterior tibial, fibular, and posterior tibial arteries supplying the fibularis longus and brevis muscles were measured.

RESULTS

In all cases, a single artery coursing in the lateral compartment of the leg was identified; it was a branch of the anterior tibial artery and it supplied the proximal and middle thirds of the fibular muscles anteriorly. The mean distance between the origin of this artery and the apex of the fibular head was 8.65 cm. Its mean length was 10.9 cm and the mean number of its branches was 5.1. In all specimens, the fibular artery supplied the proximal and distal portions of the fibular muscles posteriorly.

CONCLUSIONS

This study provides a detailed description of the morphometric properties and branching patterns of the axial pedicle of the anterior tibial artery, which runs longitudinally in the lateral compartment and supplies the fibularis longus and fibularis brevis muscles. We propose naming the pedicle of anterior tibial artery the lateral fibular artery. If this nomenclature is accepted, the fibular artery could be renamed the "posterior fibular artery".

Choke Anastomosis: A Key Element Acting as a Shunt Converter Between Adjacent Angiosomes

BACKGROUND

Choke anastomosis is commonly recognized as a resistance factor that detrimentally affects the hemodynamics of the skin flap; however, its additional potential physiological roles in normal skin function are currently not fully understood.

METHODS

Ten cadaveric forehead flap specimens pedicled with unilateral STAs were perfused with lead oxide-gelatin mixture, and then dissected into 3 layers, including the super temporal fascia-frontalis-galea aponeurotica layer, the subcutaneous adipose tissue layer, and the "super-thin flap" layer. The forehead flap and stratified specimens underwent molybdenum target x-ray and subsequent transparent processing to effectively visualize the microscopic spatial architecture of arterial vessels across all levels.

RESULTS

Based on the different anastomoses near the midline area of the flap, 2 types of arterial perfusion were identified: choke anastomosis type (8/10) and true anastomosis type (2/10). The former formed multiple choke anastomoses near the midline. In the "super-thin flap" layer, arterial perfusion density on the ipsilateral side was significantly higher compared to that on the contralateral side. The arterioles on the ipsilateral side exhibited a dense and uninterrupted distribution, whereas those on the contralateral side appeared sparse and dispersed. The latter exhibited an alternative perfusion pattern; the bilateral arterial vessels were connected with 3 to 5 true anastomoses near the midline. Furthermore, the microscopic architecture confirmed a uniform distribution of arterioles that remained continuous from ipsilateral to contralateral sides in the "super-thin flap" layer.

CONCLUSION

This study demonstrated that choke anastomosis not only impairs blood perfusion in the adjacent angiosomes but also acts as a shunt converter to impact the blood supply of distal skin flaps at different levels through the "trans-territory diversion phenomenon." This results in necrosis of the superficial dermis while preserving survival of the deep subcutaneous adipose tissue.

[Translated article] Medial tab-type fasciocutaneous flap as an alternative for the management of soft tissue defects of the leg

BACKGROUND

Selecting the right technique for lower limb soft tissue reconstruction is a therapeutic challenge. Despite having several reconstruction options, it's important to choose a technique that is effective and with the least possible donor site morbidity.

OBJECTIVE

Demonstrate the therapeutic efficacy of the medial tab flap in soft tissue reconstruction on the leg, compared to conventional flaps.

MATERIALS AND METHODS

Cohort study matched by age. 64 patients with soft tissue defects were selected and according to the intervention divided in: group (1) medial tab flap, and group (2) conventional flaps (sural, soleus, gastrocnemius) followed up to one year postoperatively.

OUTCOME VARIABLES

surgical time in minutes, healing, healing time in days, complications.

RESULTS

The patients who underwent surgery with medial tab flap and with conventional flaps healed completely. The healing time was 16.2±11.2 days in the tab flap and 16.1±11.2 days in conventional flaps, no statistically significant differences were found between the groups (p=.89). The surgical time for tab flaps was 225.2±117.8min, and 191.3±117.2min for the comparison flaps (p=.65), there were no statistically significant differences. There were no complications in the medial tab flaps.

CONCLUSION

The findings suggest that the medial tab flap technique is as effective as the conventional flap technique, with complete flap survival and healing, and without any major complications in this studied group.

Comparison of endovascular infrapopliteal revascularisation strategies based on the angiosome model in diabetics with CLTI

Background: Infrapopliteal endovascular interventions (EVT) strategies in diabetic patients are still in debate because the lesions are more likely to be diffuse with a different pattern of collateral arteries ranging from reduced to normal caliber. The aim of this all-comers study was to analyse the outcome of two different infrapopliteal EVT strategies (Group I: angiosome-based direct revascularization - DR vs. Group II: complete (direct + indirect) revascularization strategy - CR) in diabetic patients with chronic limb-threatening ischemia (CLTI) in 2 time-periods. Furthermore we analysed the outcome if DR or CR failed and only indirect revascularization (IR) or no revascularization was possible. Both groups were differentiated in patients with collaterals, defined as an intact pedal arch (immediate or after pedal PTA). Patients and methods: The database includes 91 consecutive EVT with two intrapopliteal interventional strategies performed in 68 diabetic patients (pts. 24 female, 44 male, mean age 73±10 years) between 2013-2016 and 2017-2022. Positive clinical outcome was defined as wound healing with or w/o minor amputation, combined with a symptom improvement to Rutherford category 0 or 1 after 6 months. The clinical outcome proportions were compared using the Fisher's exact test. Results: Successful DR (59%) and successful CR (47%) strategy demonstrated a similar positive clinical outcome (92.6% vs. 90.5%; p=0.594). Indirect revascularization (Group I: 26%; Group II: 44%) showed a significantly lower positive outcome in comparison to a successful DR as well as CR strategy (33.3% vs. 92.6%, p=0.0003; 40% vs 90.5%, p=0.001). IR outcome improved by the presence of collaterals (66.7% vs. 30.8%). Conclusions: In case of successful intervention, both strategies (DR and CR) yielded a similarly high proportion of positive clinical outcome. The role of collaterals and the pedal arch on the clinical outcome are important in patients in whom only IR was possible.

Medial tab-type fasciocutaneous flap as an alternative for the management of soft tissue defects of the leg

BACKGROUND

Selecting the right technique for lower limb soft tissue reconstruction is a therapeutic challenge. Despite having several reconstruction options, it's important to choose a technique that is effective and with the least possible donor site morbidity.

OBJECTIVE

Demonstrate the therapeutic efficacy of the medial tab flap in soft tissue reconstruction on the leg, compared to conventional flaps.

MATERIALS AND METHODS

Cohort study matched by age. 64 patients with soft tissue defects were selected and according to the intervention divided in: group 1)medial tab flap, and group 2)conventional flaps (sural, soleus, gastrocnemius) followed up to one year postoperatively.

OUTCOME VARIABLES

surgical time in minutes, healing, healing time in days, complications.

RESULTS

The patients who underwent surgery with medial tab flap and with conventional flaps healed completely. The healing time was 16.2±11.2 days in the tab flap and 16.1±11.2 days in conventional flaps, no statistically significant differences were found between the groups (P=.89). The surgical time for tab flaps was 225.2±117.8minutes, and 191.3±117.2minutes for the comparison flaps (P=.65), there were no statistically significant differences. There were no complications in the medial tab flaps.

CONCLUSION

The findings suggest that the medial tab flap technique is as effective as the conventional flap technique, with complete flap survival and healing, and without any major complications in this studied group.

BREAST+: An augmented reality interface that speeds up perforator marking for DIEAP flap reconstruction surgery

Deep inferior epigastric artery perforator flap reconstruction is a common technique for breast reconstruction surgery in cancer patients. Preoperative planning typically depends on radiological reports and 2D images to help surgeons locate abdominal perforator vessels before surgery. Here, BREAST+, an augmented reality interface for the HoloLens 2, designed to facilitate accurate marking of perforator locations on the patients' skin and to seamlessly access relevant clinical data in the operating room is proposed. The system is evaluated in a controlled setting by conducting a user study with 27 medical students and 2 breast surgeons. Quantitative (marking error, task completion time, and number of task repetitions) and qualitative (perceived usability, perceived workload, user preference and user satisfaction) data are collected to assess BREAST+ performance during perforator marking. The average time taken to mark each perforator is 7.7 ± 6.5 s, with an average absolute error of 6.8 ± 2.6 mm and an estimated average deviation of 3.6 ± 1.4 mm. The results revealed non-negligeable biases in user estimates likely attributed to depth perception inaccuracies. Still, the study concluded that BREAST+ is both accurate and considerably more efficient (∼6 times faster) when compared to the conventional perforator marking approach.

Treatment of trunk defects using perforator flaps: A case series introducing suprascapular artery perforator flap

This case series explores the efficacy of freestyle perforator flaps, including the newly introduced suprascapular artery perforator flap (SSAP), in reconstructing trunk defects. Over a five-year period, 24 perforator flap procedures were performed on 19 patients, primarily for defect reconstruction after skin tumor and ulcer resections. Flap design was customized using preoperative doppler ultrasound and they were then transferred to defects in a V-Y or propeller fashion. The most frequently utilized flaps were the dorsal intercostal artery perforator (DICAP) flap and the lumbar artery perforator (LAP) flap. Notably, SSAP flaps were successfully employed for shoulder defects resulting from squamous cell carcinoma resections. Complications occurred in 29 % of cases, including seroma evacuation, hematoma, and wound dehiscence, with one patient experiencing severe liver failure post-surgery. The versatility of perforator-based reconstruction was demonstrated through the combination of DICAP and LAP flaps for large trunk defects. Additionally, internal mammary artery perforator (IMAP) and lateral thoracic artery perforator (LTAP) flaps were utilized for parasternal and infraclavicular defects, respectively. The introduction of the SSAP flap expands the options for dorsal shoulder area reconstruction, offering faster healing and superior cosmetic results compared to traditional methods like secondary intention healing or skin grafting. Although this study showcases promising outcomes, further research is warranted to validate the effectiveness of SSAP flaps and to explore their applications in a broader patient population.

Evaluation of Nipple-Areola Circulation in Central Pedicle Mastopexy Patients with Subpectoral Implant Placement: A Quasi-Experimental Study

OBJECTIVE

Mastopexy is a procedure which is used in breast lift and reconstruction surgery and requires a small amount of parenchymal resection. In this procedure, the preservation of nipple-areola circulation is vital. The purpose of this study is to evaluate nipple-areola circulation in patients undergoing central pedicle mastopexy with subpectoral implant placement.

MATERIAL AND METHOD

In this observational quasi-experimental study, data were collected retrospectively from electronic medical records. The perioperative nipple-areola circulation of patients undergoing central pedicle mastopexy with subpectoral implant placement was evaluated by integrated laser Doppler flowmetry. Descriptive statistics, one-way analysis of variance, and Tukey's range tests were used to analyze the data.

RESULTS

The preoperative, skin dissection, pectoral elevation, implant placement, 24th hour, and 2nd week nipple-areola circulation statuses of each patient who underwent central pedicle mastopexy with subpectoral implant placement were examined using an integrated laser Doppler flowmeter, and the results were compared. At each stage, all measurements were in the range of 1.8-3.6 ml/min/100g. There was no statistically significant difference between the measurement results.

CONCLUSION

Central pedicle mastopexy with subpectoral implant placement seems highly advantageous in terms of better functionality and aesthetics in the reconstruction of heavy and sagging breasts.

NO LEVEL ASSIGNED

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The Past, Present, and Future of Perforator Flaps in Head and Neck Surgery

A perforator is a vessel that travels through muscle and perfuses the skin. Perforator flaps require intramuscular dissection and can be used as pedicled or free flap. With improved understanding of microvasculature, they can be tailored to have multiple skin paddles, multiple components, or shaped to conform to any defect. Reliable perforator flap-based reconstruction is a meticulous microvascular technique, ultimately allowing the surgeon to harvest any flap in a freestyle fashion and transplant to any recipient vessel. New technologies improve the safety and reproducibility of this type of reconstruction.

The Role of Computed Tomography Angiography in Perforator Flap Planning

Preoperative computed tomography angiography (CTA) for perforator free flaps is accurate, precise, and reliable in mapping perforator anatomy that can be used in the intraoperative domain. CTA holds important clinical value as a tool in surgical decision making and surgical innovation, enabling reconstructive surgeons to tailor complex flap designs for extensive defects. Integration into existing infrastructure for virtual surgical planning is feasible, and future efforts to characterize the association of preoperative CTA with postoperative outcomes and cost-analyses for perforator flaps are warranted.

Utility of Keystone Flap in Armory of Dermatosurgeons

Purpose and Background

To create awareness among dermatosurgeons about the versatility of keystone flaps in re-surfacing post-excisional small, medium and large skin defects.

Aims and Objectives

Single-staged tension-free re-surfacing of various sized skin defects using keystone flap and to have least donor site morbidity, primary healing and maximum functional outcome.

Material and Methods

This retrospective study was conducted, between October 2021 - January 2023 in Department of Plastic Surgery, PGIMS Rohtak, on 15 males and 1 female aged between 18 - 65 years. Sixteen Keystone flaps (type IIA n=13, Omega cum Sydney melanoma unit modification n=3) were utilized for resurfacing skin defects arising after excision of basal cell carcinoma (n=3) and benign hairy nevus (n=2) on cheek, basal cell carcinoma forehead (n=1), electric burns on deltoid (n=2), giant neurofibroma back (n=1), tattoo forearm (n=3), chronic non-specific granuloma thumb (n=2) and pilonidal sinus disease (n=2). Skin with maximum expansibility was chosen as donor site with utmost care of facial lines and its aesthetic subunits. Flaps were dissected all around preserving maximum number of hand-held Doppler-identified perforators in pedicular area. Sutures were removed on 10th to 15th post-operative day. Follow-ups ranged from 2 to 15 months.

Results

None had wound dehiscence or loss of flap.

Conclusion

Keystone flaps have defect-adaptive design, simple bio-geometry, technical simplicity, decreased downtime, cost effectivity and efficiency and can be designed to resurface post-excisional skin defect from head to toe with acceptable results, therefore should strongly be considered by dermatosurgeons while excising skin lesions.

Designing Perforator Flaps Using Ultrasound

Microsurgeons have today the freedom of the "chosen flap," as opposed to the "flap of choice," but the preoperative knowledge of the microanatomy of each patient is mandatory. The need for preoperative evaluation of the perforators, not only in terms of position, but also for dimensions, flow, and relationship with the surrounding structures became essential and allows more personalized reconstruction, less invasiveness, more safety and finally increase microsurgeon creativity.

Deltopectoral Flap in Head and Neck Reconstruction

Background and Objectives: The deltopectoral (DP) flap represents a reconstructive option for the head and neck. It is a fasciocutaneous flap raised from the anterior chest wall below the clavicle. Its role partially declined with the arise of free flaps. However, it still remains a valid option in patients that could not undergo a reconstruction with free flaps. The aim of this retrospective study was to evaluate the role of the DP flap in head and neck reconstruction, with a focus on surgical outcomes and complications. Materials and Methods: Thirty-one patients who underwent head and neck reconstruction with DP flap were included in the study. The delayed technique was not used in any procedure to harvest the flap beyond the deltopectoral groove. The patients' characteristics, the recipient site, the closure of the donor site, and the flap-related complications were recorded. Results: The median time to autonomization of DP flap was 23 days. Postoperative complications were observed in 10 subjects (32.3%). A partial necrosis was seen in five patients (16.1%), while a complete necrosis developed only in one case (3.2%). The diabetes mellitus was the only parameter associated with postoperative complications. In particular, the percentage of necrosis in subjects with or without diabetes was 66.7% and 8.0%, respectively. Conclusions: The DP has a wide range of applications in head and neck reconstruction, and a low complication rate can be observed. The delayed technique does not necessarily need to be applied, and the flap can be extended beyond the deltopectoral groove when necessary. However, patients with diabetes mellitus have a higher risk of postoperative necrosis of the distal portion of the flap.

Optimizing Lower Extremity Local Flap Reconstruction in Peripheral Vascular Disease

BACKGROUND

Local flaps remain a valuable reconstructive tool as a means for limb salvage for patients with advanced arterial disease. Our single-center, retrospective cohort study aims to compare the outcomes of different patterns of blood flow affected by vascular disease to pedicles in local flap reconstruction of the foot and ankle.

METHODS

A retrospective review of 92 patients and 103 flaps was performed. On angiograms, pattern of blood flow to the flap pedicle was determined to be direct inline flow (DF) or indirect flow (IF). Patterns of IF were either by arterial-arterial connections (AC) or unnamed randomized collaterals (RC). Primary outcomes were immediate flap success and limb salvage. Comparative analyses were performed using the χ2 and Fisher tests for categorical variables.

RESULTS

Among all flaps, 73.8% (n = 76/103) had DF and 26.2% (n = 27/103) had IF. Both groups experienced similar rates of immediate flap success (DF = 97.3% vs IF = 92.6%, P = 0.281) and limb salvage (DF = 75.% vs IF = 66.7%, P = 0.403). However, the rate of contralateral amputation was significantly higher in the IF group (26.9% vs 5.3%, P = 0.006). When comparing the 3 distinct patterns of blood flow (DF vs AC vs RC), pedicled flaps were more commonly supplied by DF and AC, while random pattern flaps were more commonly supplied by RC (P = 0.042).

CONCLUSIONS

Alternative routes of revascularization can maintain local flap viability and achieve similar rates of limb salvage but risks contralateral amputation. We found that pedicled and local muscle flaps require inline blood flow or blood supply by ACs. Meanwhile, random pattern flap can be supported by random collaterals.

The Double Burden: Deciphering Chronic Limb-Threatening Ischemia in End-Stage Renal Disease

BACKGROUND

Chronic limb-threatening ischemia (CLTI) in patients with end-stage renal disease (ESRD) poses significant challenges in clinical management due to its unique pathology and poor treatment outcomes. This review calls for a tailored classification and risk assessment for these patients to guide better revascularization choices with early minor amputation as a first-line strategy in advanced stages.

METHODS

This review consolidates key findings from recent literature on CLTI in ESRD, focusing on disease mechanisms, treatment options, and patient outcomes. It evaluates the literature to clarify the decision-making process for managing CLTI in ESRD.

RESULTS

CLTI in ESRD patients often results in worse clinical outcomes, such as nonhealing wounds, increased limb loss, and higher mortality rates. While the literature reveals ongoing debates regarding the optimal revascularization method, recent retrospective studies and meta-analyses suggest potential benefits of endovascular treatment (EVT) over open bypass surgery (OB) in reducing mortality and wound complications, with comparable amputation-free survival rates.

CONCLUSIONS

The selection of revascularization methods in ESRD patients with CLTI is complex, necessitating individualized strategies. The importance of early detection and timely intervention is critical to decelerate disease progression and improve revascularization outcomes. There is a shift in these treatment strategies toward less invasive endovascular procedures, acknowledging the limitations these patients face with open revascularization surgeries. Considering early minor amputations after revascularization could prevent worse consequences, reflecting a shift in the approach to managing CLTI in ESRD patients.

Angiosome-Guided Perfusion Decellularization of Fasciocutaneous Flaps

BACKGROUND

 Tissue engineering based on whole-organ perfusion decellularization has successfully generated small-animal organs, including the heart and limbs. Herein, we aimed to use angiosome-guided perfusion decellularization to develop an acellular fasciocutaneous flap matrix with an intact vascular network.

METHODS

 Abdominal flaps of rats were harvested, and the vascular pedicle (iliac artery and vein) was dissected and injected with methylene blue to identify the angiosome region and determine the flap dimension for harvesting. To decellularize flaps, the iliac artery was perfused sequentially with 1% sodium dodecyl sulfate (SDS), deionized water, and 1% Triton-X100. Gross morphology, histology, and DNA quantity of flaps were then obtained. Flaps were also subjected to glycosaminoglycan (GAG) and hydroxyproline content assays and computed tomography angiography.

RESULTS

 Histological assessment indicated that cellular content was completely removed in all flap layers following a 10-hour perfusion in SDS. DNA quantification confirmed 81% DNA removal. Based on biochemical assays, decellularized flaps had hydroxyproline content comparable with that of native flaps, although significantly fewer GAGs (p = 0.0019). Histology and computed tomography angiography illustrated the integrity and perfusability of the vascular system.

CONCLUSION

 The proposed angiosome-guided perfusion decellularization protocol could effectively remove cellular content from rat fasciocutaneous flaps and preserve the integrity of innate vascular networks.

Update on Blindness From Filler: Review of Prognostic Factors, Management Approaches, and a Century of Published Cases

Vision loss secondary to aesthetic filler treatment is a rare but disastrous complication. The aim of this review was to update the published cases of blindness after filler injection that have occurred since our group published reviews of 98 cases in 2015 and an additional 48 cases in 2019. A literature review was performed to identify all cases of visual complications caused by filler injection published between September 2018 and March 2023. The cases were analyzed independently and in combination with previously reviewed cases. Analyses were based on the number of cases with data available. A total of 365 new cases of partial or complete vision loss after filler injection were identified. The sites that were highest risk were the nose (40.6%), forehead (27.7%), and glabella (19.0%). The filler injected was hyaluronic acid in 79.6% of cases. The most common associated signs were ptosis (56.2%), ophthalmoplegia (44.1%), pain (31.2%), and skin changes (73.2%). Strokelike features were seen in 19.2% of cases. Of the cases reporting visual outcomes (318), 6.0% experienced complete vision recovery, 25.8% had partial improvement in visual acuity, and 68.2% had no vision recovery. Partially preserved visual acuity at onset was a significant predictor of visual improvement (P < .001). The 3 most common treatments were subcutaneous hyaluronidase at or near the filler site (70.1%), systemic steroids (57.3%), and intraarterial thrombolytic therapy (56.0%). No treatments were significantly associated with visual improvement (P > .05). Although blindness and stroke from fillers is a rare complication, practitioners who inject filler should have a thorough knowledge of prevention and management strategies.

LEVEL OF EVIDENCE: 3

Flap Monitoring Techniques: A Review

Postoperative tissue flap vitality monitoring enables early detection of clinical complications, allowing for intervention. Timely re-operation can prevent the need for extensive correction procedures, thus reducing healthcare costs and hospitalization time. Statistics show that monitoring can increase the success rate of flap survival to 95% or higher. However, despite the significant progress in monitoring techniques, major and minor complications, leading to the loss of the flap, still occur. This clinical application review aims to provide a comprehensive overview of the recent advancements and findings in flap surgery reconstructions, transplants, and systems for their postoperative assessment. The literature from the years 1925 to 2024 has been reviewed to capture previous and current solutions for monitoring flap vitality. Clinically acclaimed methods and experimental techniques were classified and reviewed from a technical and clinical standpoint. Physical examination, metabolism change, ultrasound method, and electromagnetic (EM) radiation-based measurement methods were carefully evaluated from the perspective of their considered applications. Guidelines aiding engineers in the future design and development process of monitoring systems were proposed. This paper provides a comprehensive overview of the monitoring techniques used in postoperative flap vitality monitoring. It also gives an overview of each approach and potential ways for future development.

Advances in Modern Microsurgery

Background/Objectives: Microsurgery employs techniques requiring optical magnification and specialized instruments to operate on small anatomical structures, including small vessels. These methods are integral to plastic surgery, enabling procedures such as free tissue transfer, nerve reconstruction, replantation, and lymphatic surgery. This paper explores the historical development, advancements, and current applications of microsurgery in plastic surgery. Methods: The databases MEDLINE (via PubMed) and Web of Science were selectively searched with the term "(((microsurgery) OR (advances)) OR (robotic)) OR (AI)) AND (((lymphatic surgery) OR (peripheral nerve surgery)) OR (allotransplantation))" and manually checked for relevance. Additionally, a supplementary search among the references of all publications included was performed. Articles were included that were published in English or German up to June 2024. Results: Modern microsurgical techniques have revolutionized plastic surgery, enabling precise tissue transfers, improved nerve reconstruction, and effective lymphedema treatments. The evolution of robotic-assisted surgery, with systems like da Vinci and MUSA, has enhanced precision and reduced operative times. Innovations in imaging, such as magnetic resonance (MR) lymphography and near-infrared fluorescence, have significantly improved surgical planning and outcomes. Conclusions: The continuous advancements in microsurgery, including supermicrosurgical techniques and robotic assistance, have significantly enhanced the capabilities and outcomes of plastic surgery. Future developments in AI and robotics promise further improvements in precision and efficiency, while new imaging modalities and surgical techniques expand the scope and success of microsurgical interventions.

Flow-Through Radial Artery Forearm Flap for Tongue Revascularization After Excision of Base of Tongue Malignancies

Tongue cancers are common in the spectrum of oral malignancies. In base of tongue cancers, tumour excision might lead to injury of ipsilateral or both lingual arteries, leading to ischemia of residual, native tongue. Free radial artery forearm flap is commonly used for tongue reconstruction. It can also be used as a flow-through flap for the reconstruction of the tongue defect as well as to revascularise the cancer-free tongue remnant. We report here two cases of base of tongue excision for which free flow-through radial forearm flap was used to reconstruct the tongue defect as well as salvage the remaining part of ischemic tongue. This technique can be effectively considered in selected cases of vascular compromise due to lingual vessel sacrifice to preserve the cancer-free anterior native tongue tissue with improved functional outcomes.

Fat Necrosis in Single Perforator Deep Inferior Epigastric Artery and Superficial Epigastric Artery Perforator Free Flaps: A Prospective Randomized Study

Background

The deep inferior epigastric perforator (DIEP) flap is the standard of care in autologous breast reconstruction. The superficial inferior epigastric artery perforator flap (SIEA) is an alternative reconstructive option, with the compromise of less donor-site morbidity but variable perfusion to subscarpal fat zones. Fat necrosis is a known complication from marginal perfusion variability. Volumetric analysis of fat necrosis has not been performed between the two reconstructive options, nor has the amount of flap necrosis following radiation. Our objective was to compare rates and volume of fat necrosis between single-perforator DIEP and SIEA flap techniques.

Methods

A single-center, blinded, prospective cohort study of patients randomized between SIEA and DIEP breast reconstruction was conducted over 2 years (June 2011-July 2013). Inclusion criteria were women undergoing immediate reconstruction following mastectomy. Randomization protocols were strictly followed. Fat necrosis volumetric analysis was determined by an ultrasound-trained attending surgeon at 12 months postoperatively. Patient demographics and adjuvant/neoadjuvant cancer treatment were analyzed. Statistical analyses included Mann-Whitney U tests, chi square, and/or Fisher exact tests. P values of 0.05 or less were considered significant.

Results

Fat necrosis was detected in 11 of 46 flaps (23.9%), with a median area of 17.9 cm2. There was no significant difference in prevalence of fat necrosis between the two flap types (P = 0.19). Postoperative radiation did not increase the prevalence (P = 0.30) or extent (P = 0.92) of fat necrosis.

Conclusion

Single-perforator DIEP and SIEA flaps have comparable rates of fat necrosis. Postoperative radiation did not result in increased prevalence or extent of fat necrosis.

The largest perforator of DIEP flap has a higher rate of continuity with the superficial inferior epigastric artery

BACKGROUND

In deep inferior epigastric artery (DIEA) perforator (DIEP) flap breast reconstruction, the network with the superficial inferior epigastric artery (SIEA) is key to achieving stable subcutaneous blood flow to the flap. This study investigated how the diameter and location of the DIEA perforator affect continuity with the SIEA.

METHODS

A retrospective analysis of 94 specimens from 47 patients who underwent DIEA perforator flap breast reconstruction was performed. Relationships between the diameter and location of the DIEA perforator and its continuity with the SIEA were examined on preoperative multi-slice computed tomography.

RESULTS

The largest DIEA perforator on each specimen showed continuity with the SIEA in 94 %, significantly more than the second (80 %; p = 0.027) or third largest perforator (76 %; p = 0.005). Medial perforators from 3 cm above to 3 cm below the umbilicus showed more continuity with the SIEA than lateral perforators (p = 0.008).

CONCLUSIONS

Selection of the largest perforator of DIEP flap is advantageous in terms of continuity with the SIEA. Also, near the umbilicus, medial perforators communicate with the SIEA more than lateral perforators.

A Comprehensive Flap Classification: Beyond the Reconstructive Ladder

ABSTRACT

Perforator flaps have progressed massively in the last years. The improved vascular imaging techniques and the use of supermicrosurgery have shifted the practice from the traditional predefined angiosomal flaps to the endless variations of custom-made flaps. In this article, we propose a broadened classification of free-style flaps in 3 categories, the angiosomal, including all traditional perforator flaps and their variations, the extra-angiosomal, including flaps that are manufactured to include tissue from a different angiosome, such as turbocharging or supercharging a flap, and neoangiosomal flaps, which are based on the process of neoangiogenesis on autologous or allogenous tissue, such as the venous flow-through flap and integra flap. With this classification, we hope to help unify the classifications and, by doing so, facilitate the exchange of ideas, techniques and knowledge.MeSH terms: surgical flap / classification, terminology as topic.

Research Advances in Vascular Remodeling in Choke Vessels of Perforator Flap: A Systematic Review

BACKGROUND

As a significant bridge between perforasomes, choke vessels are the key structure of blood supply expansion, also a prerequisite for preventing distal ischemic necrosis of the multiterritory perforator flap, where the remodeling of choke vessels after flap elevation plays an essential role. This systematic review highlights the underlying mechanisms and clinical ways to promote remodeling of choke vessels, as well as experimental observation approaches to further guide researchers.

METHODS

A systematic review was conducted from 1975 to 2023 through PubMed, EMBASE, Web of Science, and Cochrane database with the key words "choke vessels" and "perforator flap" to investigate the mechanisms and ways to promote remodeling of choke vessels as well as observation approaches. The inclusion criteria and exclusion criteria were set to screen the literature.

RESULTS

A total of 94 literatures were obtained through database retrieval. After removing the duplicate literature, reading the title and abstract, and reviewing the full text finally, 33 articles were included in the final study.

CONCLUSIONS

The underlying remodeling of choke vessels may be related to fluid shear stress, hypoxia, and inflammation. The clinical ways to promote remodeling of choke vessels include surgical delay, arterial supercharge, venous superdrainage, drugs, and stem cells. Various experimental methods of observing microvascular morphology allow for a comprehensive research of choke vessels.

Superficial Inferior Epigastric Artery Flap: Vascular Pattern and Territory Across the Midline

BACKGROUND

 Superficial inferior epigastric artery (SIEA) flap offers a significant advantage of lower donor site morbidity over other abdominal-based flaps for breast reconstruction. However, the inconsistent anatomy and territory across the midline remains a major issue. This study aimed to investigate the SIEA and determine its pattern and territory across the midline.

METHODS

 Twenty cadavers were studied. Ipsilateral dye was injected to the dominant SIEA. Dissection was performed to evaluate the SIEA origin, artery and vein pattern, vessel diameter, and dye diffusion territory.

RESULTS

 Overall, three SIEA patterns were identified: bilateral presence (45%), ipsilateral presence (30%), and bilateral absence (25%). The territory depended on the vessel course and dominant SIEA diameter, not on its common origin from the femoral artery, at the pubic tubercle level. Regarding the midline territory (pubic tubercle level to umbilicus), SIEA (type 1a) with a diameter of ≥1.4 mm on either side supplied at least half the distance, whereas SIEA with a diameter of <1 mm was limited to the suprapubic area.

CONCLUSION

 Designing a SIEA flap island across the midline is feasible when contralateral SIEA is present to augment the contralateral territory (e.g., type 1a SIEA) or in SIEA with a common/superficial external pudendal artery origin. Preoperative imaging studies are important for confirming the SIEA system. When the diameter at the origin of the SIEA flap is larger than 1.4 mm, the blood supply to the ipsilateral and contralateral sides is sufficient to enable safe flap elevation.

The Circulasome: A Unifying Theory of Flap Vascularity

Despite the critical roles of nondominant perforators, choke vessels, and direct and indirect linking vessels in flap vascularity, current models of flap perfusion focus on a primary large caliber perforators. The delay phenomenon, microvascularization, neovascularization, and vascular evolution, which depend on smaller caliber vessels, remain unaccounted for. We propose that the "circulasome" consists of the sum of the entire vascular components of a given region, such that the region is supplied by a primary supplying vessel. The circulasome represents one of the indices of flap supply and is proportional to the angiogenic potential of the region and the vascular substrate capable of promoting growth of vascular networks. By accounting for both the primary flap supplying vessel and secondary vascular structures, the circulasome provides a unifying explanation for neovascularization, delay phenomenon, angiosome and perforasome theories, and vascular evolution in flaps.

Distal Bypass Improves Skin Perfusion Pressure at the Whole Foot Regardless of Angiosomes in Patients with Chronic Limb-Threatening Ischemia

Objectives: Distal bypass surgery's effect on tissue blood pressure beyond a focal angiosome remains debated. This study assessed tissue blood pressure in both direct revascularized angiosome (DRA) and indirect revascularized angiosome (IRA) after bypass surgery, utilizing repeated skin perfusion pressure (SPP) measurements. Methods: Twenty-nine limbs in 27 chronic limb-threatening ischemia (CLTI) patients (22 males and five females, age: 70.2 ± 9.3 years) who received distal bypass surgery were enrolled. SPP measurements were conducted for the DRA and IRA at 10 time intervals, encompassing both preoperative and postoperative periods of every 3-5 days until 30 days. Results: In total, 486 SPP measurements were collected from 58 measurement sites, and the transition of the SPP at the DRA was 35.4-62.5-59.5-70.2-58.2-62.2-63.1-63.6-63.8-73.4 mmHg and IRA was 29.4-53.4-53.7-58.8-51.3-63.1-47.9-62.1-57.6-61.0 mmHg. No significant differences were observed between SPP at the DRA and IRA. Fifteen wounds on the DRA (63%) and five on the IRA (100%) healed. Conclusion: Distal bypass improves SPP in both direct and IRAs of CLTI patients. These data indicated distal bypass improves tissue blood flow at entire foot regardless of angiosomes.

2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines

AIM

The "2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease" provides recommendations to guide clinicians in the treatment of patients with lower extremity peripheral artery disease across its multiple clinical presentation subsets (ie, asymptomatic, chronic symptomatic, chronic limb-threatening ischemia, and acute limb ischemia).

METHODS

A comprehensive literature search was conducted from October 2020 to June 2022, encompassing studies, reviews, and other evidence conducted on human subjects that was published in English from PubMed, EMBASE, the Cochrane Library, CINHL Complete, and other selected databases relevant to this guideline. Additional relevant studies, published through May 2023 during the peer review process, were also considered by the writing committee and added to the evidence tables where appropriate.

STRUCTURE

Recommendations from the "2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease" have been updated with new evidence to guide clinicians. In addition, new recommendations addressing comprehensive care for patients with peripheral artery disease have been developed.

2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines

AIM

The "2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease" provides recommendations to guide clinicians in the treatment of patients with lower extremity peripheral artery disease across its multiple clinical presentation subsets (ie, asymptomatic, chronic symptomatic, chronic limb-threatening ischemia, and acute limb ischemia).

METHODS

A comprehensive literature search was conducted from October 2020 to June 2022, encompassing studies, reviews, and other evidence conducted on human subjects that was published in English from PubMed, EMBASE, the Cochrane Library, CINHL Complete, and other selected databases relevant to this guideline. Additional relevant studies, published through May 2023 during the peer review process, were also considered by the writing committee and added to the evidence tables where appropriate.

STRUCTURE

Recommendations from the "2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease" have been updated with new evidence to guide clinicians. In addition, new recommendations addressing comprehensive care for patients with peripheral artery disease have been developed.

Perfusion increase in foot angiosomes: Comparison between direct and indirect revascularization of crural arteries

BACKGROUND AND AIMS

In retrospective studies, wound healing and leg salvage have been better if revascularization is targeted to the crural artery supplying arterial flow to the wound angiosome. No data exist on how revascularization changes the blood flow in foot angiosomes. The aim of this study was to evaluate the change in perfusion after infrapopliteal artery revascularization in all foot angiosomes and to compare directly revascularized (DR) angiosomes to the indirectly revascularized (IR) angiosomes.

METHODS

In this prospective study, foot perfusion was measured with indocyanine green fluorescence imaging (ICG-FI) before and after either surgical or endovascular below-knee revascularization. According to angiograms, we divided the foot angiosomes into DR and IR angiosomes. Furthermore, in a subanalysis, the IR angiosomes were graded as IR_Coll+ angiosomes if there were strong collaterals arising from the artery which was revascularized, and as IR_Coll- angiosomes if strong collaterals were not seen.

RESULTS

A total of 72 feet (28 bypass, 44 endovascular revascularizations) and 282 angiosomes were analyzed. Surgical and endovascular revascularization increased perfusion significantly in both DR and IR angiosomes. After bypass surgery, the increase in DR angiosomes was 55 U and 53 U in IR angiosomes; there were no significant difference in the perfusion increase between IR and DR angiosomes. After endovascular revascularization, perfusion increased significantly more, 40 U, in DR angiosomes compared to 26 U in IR angiosomes (p < 0.05). In the subanalysis of IR angiosomes, perfusion increased significantly after surgical bypass regardless of whether strong collaterals were present or not. After endovascular revascularization, however, a significant perfusion increase was noted in the IR_Coll+ but not in the IR_Coll- subgroup.

CONCLUSION

Open revascularization increased perfusion equally in DR and IR angiosomes, whereas endovascular revascularization increased perfusion significantly more in DR than in IR angiosomes. Strong collateral network may help increase perfusion in IR angiosomes.

The Delay Procedure in Deep Inferior Epigastric Artery Perforator Flap Breast Reconstruction

BACKGROUND

The delay procedure in deep inferior epigastric artery perforator (DIEP) flap breast reconstruction, in which the reduced-caliber choke vessels play a major role, can provide more well-perfused tissue than a standard DIEP flap. The aim of this study was to review the authors' experience with this technique, evaluate the indications, and analyze the surgical outcomes.

METHODS

A retrospective study was conducted of all consecutive DIEP delay procedures performed between March of 2019 and June of 2021. Patient demographic characteristics, operative details, and complications were registered. Patients had preoperative imaging by magnetic resonance angiography to select dominant perforators. The surgical technique involves a two-stage operation. During the first operation, the flaps were pedicled on a dominant perforator and a lateral skin bridge extending toward the lateral flank and lumbar fat; in a second stage, the flap was harvested and transferred.

RESULTS

A total of 82 extended DIEP delay procedures were performed to reconstruct 154 breasts. The majority were bilateral breast reconstructions (87.8%). The delay procedure was used for 38 primary reconstructions (46.3%) and 32 tertiary reconstructions (39.0%). The primary indication was the need for additional volume (79.3%), followed by extensive abdominal scarring and liposuction. After the first operation, seroma was the most frequently observed complication (7.3%). After the second operation, three total flap losses (1.9%) were observed.

CONCLUSIONS

The delay procedure in DIEP flap breast reconstruction results in the harvest of a good amount of abdominal tissue by adding a preliminary procedure. This technique can convert cases previously considered unsuitable into suitable candidates for abdominal-based breast reconstruction.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

More potential uses of specific perforator flaps in the calf - A cadaveric study on the subdermal vascular structure of the lower leg

BACKGROUND

The perforator flap has garnered significant interest since its inception due to its advantage of not needing a vascular network at the deep fascial level. Perforator flaps are commonly utilized in different flap transplant surgeries, and the thigh flap is presently the most widely used perforator flap. Is it possible for the calf to replace the thigh as a more suitable site for harvesting materials? Currently, there is a lack of relevant anatomical research. This study aims to address this question from an anatomical and imaging perspective.

METHODS

This study used cadavers to observe the branches and courses of perforators on the calf and the distribution of skin branches using microdissection techniques, digital X-ray photography, and micro-computed tomography techniques.

RESULTS

The perforators had three main branches: the vertical cutaneous branch, the oblique cutaneous branch, and the superficial fascial branch. The superficial fascial branch traveled in the superficial fascia and connected with the nearby perforators. The vertical and oblique cutaneous branches entered the subdermal layer and connected with each other to create the subdermal vascular network.

CONCLUSIONS

We observed an intact calf cutaneous branch chain between the cutaneous nerve and the perforator of the infrapopliteal main artery at the superficial vein site. Utilizing this anatomical structure, the calfskin branch has the potential to serve as a substitute for thigh skin flap transplantation and may be applied to perforator flap transplantation in more locations.

Multispectral Depolarization Based Living-Skin Detection: A New Measurement Principle

Camera-based photoplethysmographic imaging enabled the segmentation of living-skin tissues in a video, but it has inherent limitations to be used in real-life applications such as video health monitoring and face anti-spoofing. Inspired by the use of polarization for improving vital signs monitoring (i.e. specular reflection removal), we observed that skin tissues have an attractive property of wavelength-dependent depolarization due to its multi-layer structure containing different absorbing chromophores, i.e. polarized light photons with longer wavelengths (R) have deeper skin penetrability and thus experience thorougher depolarization than those with shorter wavelengths (G and B). Thus we proposed a novel dual-polarization setup and an elegant algorithm (named "MSD") that exploits the nature of multispectral depolarization of skin tissues to detect living-skin pixels, which only requires two images sampled at the parallel and cross polarizations to estimate the characteristic chromaticity changes (R/G) caused by tissue depolarization. Our proposal was verified in both the laboratory and hospital settings (ICU and NICU) focused on anti-spoofing and patient skin segmentation. The clinical experiments in ICU also indicate the potential of MSD for skin perfusion analysis, which may lead to a new diagnostic imaging approach in the future.

First standardized assessment of perforators and perforasomes of the occipital artery - An anatomical study

BACKGROUND

Flaps have become an integral part of plastic and reconstructive surgery. The robust blood supply of such flaps is a prerequisite to reduce flap failure. Despite the reported versatility of the occipital flap, comprehensive anatomical studies on its perforators and perforasomes are lacking. Hence, we examined the perforators originating from the occipital artery and their associated perforasomes, aiming to fill this knowledge gap for reconstructive surgery techniques.

METHODS

39 of 40 occipital arteries of 20 fresh anatomical head specimens were dissected. Perforators with a least an outer diameter of 0.50 mm were identified and injected with dye to color their respective perforasomes. Location and size of the colored skin areas were determined as well as the location of their perforators were documented and analyzed.

RESULTS

In total, 183 perforators were found and described. The mean diameter of these vessels was 0.88 ± 0.27 mm (0.5-2.1 mm). The mean area of the perforasomes was 1288.26 ± 662.51 mm2 (144.60-3890.60 mm2). They were localized over the whole nuchal and occipital area. Lastly, perforator diameters were significantly associated with the size of their resulting perforasomes.

CONCLUSION

This study is the first comprehensive overview of perforators and associated perforasomes of the occipital artery on a respectable amount of specimen. The arterial supply of big portions of the occipital and nuchal area is provided solely by the perforators of the occipital artery. For flap surgery, perforator diameter is a crucial detail to be considered in the decision-making process.

Extrinsic Vascular Pathway Preservation Improves Survival in a Rat Three-Territory Flap Model Based on the Deep Circumflex Iliac Artery

BACKGROUND

Extended flaps are commonly applied for large defects. However, a postoperative flap necrosis incidence of 11% to 44% remains a major complication. Previous clinical studies have shown that maintaining the extrinsic vascular pathway (EVP) can increase the survival area of extended flaps. The authors hypothesized that preserving the EVP would improve flap survival by reducing blood resistance within the vascular territory.

METHODS

Twenty-four adult male Sprague-Dawley rats were used. Tissue samples were obtained from eight untreated rats as a baseline control. Three-territory flaps were elevated in the remaining 16 rats. The EVP was preserved or ligated. Flap perfusion was assessed immediately using indocyanine green angiography. Rats were euthanized on day 7. The flap survival area was measured using Adobe Photoshop. Hematoxylin and eosin staining, CD31 immunostaining, and Western blot analysis of vascular endothelial growth factor protein expression were used to quantitatively assess vasodilation and angiogenesis in choke zones.

RESULTS

Indocyanine green angiography revealed that blood could flow through the preserved EVP and perfuse the third vascular territory of the flap. EVP preservation significantly increased flap survival area (86.3%, 19.3% difference; P < 0.001), promoted vasodilation (5.0/choke zone, 3.0/choke zone difference; P = 0.013) and angiogenesis (29.3/mm 2 , 14.3/mm 2 difference; P = 0.002), and increased vascular endothelial growth factor expression (0.6, 0.2 difference; P = 0.067) in the second choke zone.

CONCLUSIONS

EVP preservation improves flap survival in this rat three-territory flap model. Further investigation in large-animal models is required for clinical translation.

CLINICAL RELEVANCE STATEMENT

Although further validation in large animal models and prospective clinical trials are necessary to verify the efficacy of the authors' hypothesis, their findings suggest that the EVP preservation procedure could provide an alternative for surgeons to create an extended flap in defect reconstruction.

Prediction of pedicled flap survival preoperatively by operating indocyanine green angiography at 1,450 nm wavelength: an animal model study

Background

Predicting flap viability benefits patients by reducing complications and guides flap design by reducing donor areas. Due to varying anatomy, obtaining individual vascular information preoperatively is fundamental for designing safe flaps. Although indocyanine green angiography (ICGA) is a conventional tool in intraoperative assessment and postoperative monitoring, it is rare in preoperative prediction.

Methods

ICGA was performed on 20 male BALB/c mice under five wavelengths (900/1,000/1,100, /1,250/1,450 nm) to assess vascular resolution after ICG perfusion. A "mirrored-L" flap model with three angiosomes was established on another 20 male BALB/c mice, randomly divided into two equal groups. In Group A, a midline between angiosomes II and III was used as a border. In Group B, the points of the minimized choke vessel caliber marked according to the ICG signal at 1,450 nm wavelength (ICG1450) were connected. Necrotic area calculations, pathohistological testing, and statistical analysis were performed.

Results

The vascular structure was clearly observed at 1,450 nm wavelength, while the 900 to 1,100 nm failed to depict vessel morphology. Necrosis was beyond the borderline in 60% of Group A. Conversely, 100% of Group B had necrosis distal to the borderline. The number of choke vessels between angiosomes II and III was positively correlated with the necrotic area (%). The pathohistological findings supported the gross observation and analysis.

Conclusion

ICG1450 can delineate the vessel structure in vivo and predict the viability of pedicled skin flaps using the choke vessel as the border between angiosomes.

Brazilian Society of Angiology and Vascular Surgery 2023 guidelines on the diabetic foot

The diabetic foot interacts with anatomical, vascular, and neurological factors that challenge clinical practice. This study aimed to compile the primary scientific evidence based on a review of the main guidelines, in addition to articles published on the Embase, Lilacs, and PubMed platforms. The European Society of Cardiology system was used to develop recommendation classes and levels of evidence. The themes were divided into six chapters (Chapter 1 - Prevention of foot ulcers in people with diabetes; Chapter 2 - Pressure relief from foot ulcers in people with diabetes; Chapter 3 -Classifications of diabetic foot ulcers; Chapter 4 - Foot and peripheral artery disease; Chapter 5 - Infection and the diabetic foot; Chapter 6 - Charcot's neuroarthropathy). This version of the Diabetic Foot Guidelines presents essential recommendations for the prevention, diagnosis, treatment, and follow-up of patients with diabetic foot, offering an objective guide for medical practice.

Challenging the angiosome concept: Delineating peripheral arterial disease patterns in diabetic foot ulcers

OBJECTIVES

The angiosome concept has significantly impacted diabetic foot ulcer management by highlighting the vascular anatomy's role in wound healing. However, its clinical applicability and validity remain debated due to complexities in foot blood supply and ulcer location determination.

METHODS

A cross-sectional study was conducted on 84 individuals with diabetic foot ulcers undergoing lower limb angiography. Demographics, ulcer characteristics, and angiographic data were collected and analyzed using descriptive statistics and relevant tests.

RESULTS

Digital subtraction angiography assessed 89 limbs with diabetic foot ulcers; males comprised 54.8%, primarily type 2 diabetes (96.4%), averaging 64.36 ± 10.09 years. Of 129 angiosomes, angiosome 2 (40.3%) had the highest ulcer incidence. Posterior tibial artery (PTA) involvement was predominant (72.9%), while external iliac artery (EIA) and profunda femoris artery (PFA) were least affected (2.4% each). Posterior tibial artery showed 46.5% complete occlusion. Angiosome 2 correlated notably with anterior tibial artery (ATA), peroneal artery (CPA), and PTA, but categorizing angiosomes by supply patterns showed no significant artery correlation (p > .05).

CONCLUSIONS

The research indicates inconsistent support for below-the-knee artery involvement correlating with foot ulcer locations in angiosomes. While aiding vascular comprehension, the angiosome concept may not fully elucidate lower limb vascular complexities and ulcer genesis. Factors like collateral circulation should be noticed to understanding ulcer localization and severity, extending beyond angiosomal arterial supply.

[Current role of the latissimus dorsi flap in traumatology: Analysis of the activity of a plastic surgery department in a military hospital]

Reconstructive surgery's workhorse, the latissimus dorsi flap is increasingly abandoned in favour of fasciocutaneous flaps. The purpose of this study was to analyse the methods used to perform this flap and the evolution of its indications in order to define its current place in traumatology. Forty-four cases were recorded retrospectively from January 2000 to December 2020 at HIA Percy, including 37 cases of free flaps, mainly performed for reconstruction of extensive loss of substance with bone and/or joint exposure. It was also performed in 10.8% of cases for salvage after failure of an alternative reconstruction solution. This analysis confirms the value of the latissimus dorsi flap in cases of significant substance loss in the lower limb, but also in burn patients for functional rehabilitation or to allow early rehabilitation.

NIR-II Protein-Escaping Dyes Enable High-Contrast and Long-Term Prognosis Evaluation of Flap Transplantation

Real-time vascular positioning, postoperative flap monitoring, and vascular reconstruction assessment are of great importance in flap transplantation. Cyanine dyes offer the advantage of high resolution in the Near-infrared-II (NIR-II) imaging window. However, the nonspecific binding of many cyanine dyes to endogenous albumin leads to high organ accumulation and skin absorption, resulting in low-quality imaging and poor reproducibility of contrast during long-term (e.g., 7 days) postoperative monitoring. Here, a novel strategy is proposed that can be widely applied to prevent protein binding for NIR-I/II Cl-containing cyanine dyes. This strategy produces protein-escaping dyes, ensuring high fluorescence enhancement in the blood with rapid clearance and no residual fluorescence, allowing for short-term repeatable injections for vascular imaging. This strategy in the perioperative monitoring of pedicle perforator flap models in mice and rats is successfully applied. Furthermore, leveraging the universality of this strategy, multiple nonoverlapping protein-escaping probes that achieve dual-excitation (808 and 1064 nm) interference-free imaging of nerve-vessel and tumor-vessel simultaneously are designed and synthesized. These protein-escaping dyes enable long-term repeatable dual-color imaging of tumor localization, resection, and tumor-vessel reconstruction at the wound site.

Duplex ultrasound and pedal acceleration time as tools to evaluate foot perfusion: a literature review

Currently, the standard non-invasive test for diagnosing Peripheral Arterial Disease is the Ankle-Brachial Index. However, this test becomes unfeasible in a certain population. New evidence proposes the pedal acceleration time, an ultrasound index, as an alternative test. An integrative bibliographic review was carried out between June 3, 2022 and January 8, 2023, to investigate this new index as a tool to assess foot perfusion. Papers published in English, Portuguese, or Spanish between 2012 and 2022 were searched on PubMed, Google Scholar, and Scielo, using the keywords "Peripheral Arterial Disease" AND "Acceleration Time" AND (Pedal OR Plantar). Research that didn't assess foot perfusion using the methods of interest or did not present human data and also case series or reports were excluded. Seven out of the sixty-six articles identified in the searches were selected for the review, all of which had notable methodological limitations. Pedal acceleration time seems to be able to diagnose and stratify and may reflect prognosis.

[Unilateral secondary breast reconstruction using a pedicled dorsal flap sparing the latissimus dorsi (TDAP and MSLD) in patients with a history of total mastectomy for breast cancer. Monocentric observational study]

INTRODUCTION

The use of pedicled dorsal flaps sparing the latissimus dorsi muscle (TDAP and MSLD flap) is a well-described reconstruction method in breast reconstruction after breast cancer. However, little data exists regarding patient satisfaction after this surgery. The main objective of this study was to evaluate patient satisfaction after unilateral total secondary breast reconstruction using a TDAP or MSLD flap. The secondary objectives corresponded to the evaluation of postoperative complications following this surgery, the evaluation of the duration of the reconstruction and the nature of additional interventions, the evaluation of the functional after-effects, and the evaluation of the chest size when the reconstruction is completed.

MATERIAL AND METHOD

This is a monocentric, retrospective cohort study, including 22 patients who underwent unilateral secondary total breast reconstruction using a TDAP or MSLD flap between January 1, 2018 and December 31, 2022. Patient satisfaction was assessed using three questionnaires validated in breast reconstruction: the Reconstruction module of the BREAST-Q, the MBROS-S and the MBROS-BI.

RESULTS

The MBROS-S satisfaction score is 71.4%. The MBROS-BI body image score is 62%. With the BREAST-Q, the Satisfaction with Breast score is estimated at 53.1; the Satisfaction with Back score is estimated at 75.5; the physical well-being score regarding the chest is evaluated at 71.7; the physical well-being score concerning the shoulder and back is evaluated at 67.4; the psychosocial well-being score is assessed at 67.4; the sexual well-being score is estimated at 48.7; and for women who have benefited from reconstruction associated with a prosthesis, the satisfaction score regarding the implant is 71.6.

CONCLUSION

Unilateral total secondary breast reconstruction with a dorsal pedicled flap sparing the latissimus dorsi muscle is an elegant, reliable, and respectful way to reconstruct a breast, and appears to give high levels of satisfaction.