Free tissue transfer in acute burns

Free Flap Failure and Complications in Acute Burns: A Systematic Review and Meta-analysis

Background

Severe acute burn injuries represent a challenge to the reconstructive surgeon. Free flap reconstruction might be required in cases of significant critical structure exposure and soft tissue deficits, when local options are unavailable. This study aimed to determine the free flap complication rate in acute burn patients.

Methods

A systematic review and meta-analysis were conducted and reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines and registered on the International Prospective Register of Systematic Reviews database (CRD42023404478). The following databases were accessed: Embase, PubMed, Web of Science, and Cochrane Library. The primary outcome was the free flap failure rate.

Results

The study identified 31 articles for inclusion. A total of 427 patients (83.3% men, 16.7% women) accounting for 454 free flaps were included. The mean patient age was 36.21 [95% confidence interval (CI), 31.25-41.16]. Total free flap loss rate was 9.91% [95% CI, 7.48%-13.02%], and partial flap loss was 4.76% [95% CI, 2.66%-8.39%]. The rate of venous thrombosis was 6.41% [95% CI, 3.90%-10.36%] and arterial thrombosis was 5.08% [95% CI, 3.09%-8.26%]. Acute return to the operating room occurred in 20.63% [16.33%-25.71%] of cases. Stratified by body region, free flaps in the lower extremity had a failure rate of 8.33% [95% CI, 4.39%-15.24%], whereas in the upper extremity, the failure rate was 6.74% [95% CI, 3.95%-11.25%].

Conclusion

This study highlights the high risk of free flap complications and failure in acute burn patients.

"Extensive necrosis following extravasation of alkali in the crease of the elbow after voluntary intravenous injection: A case report"

Chemical burns are often deep with difficult initial clinical evaluation, especially those due to alkalic agents, which have a strong penetrating power. They therefore require specialized care in a Burn Unit. Self-inflicted burns are infrequent but their management represents a real challenge. We report the case of a 47-year-old referred to our Burn Center for the evaluation of a self-inflicted corrosion with an alkalic agent (soda), injected at the crease of the left elbow. The patient, right handed, was a nurse and had notably a psychiatric history of depressive syndrome. We observed a deep, well-defined necrosis area, associated with intense peri-lesional inflammation and extensive cellulitis. Faced with this unusual clinical appearance for a chemical burn, the patient's questioning was repeated and the patient finally admitted to having injected himself with a basic caustic product intravenously. Surgical treatment was carried out in two stages: debridement with exposure of vascular and neural structures then coverage with a free anterolateral thigh flap. The postoperative consequences were uneventful with a satisfactory functional result. Factitious disorders are underestimated and often misleading. Among factitious disorders, self-inflicted wounds remain a real challenge requiring multidisciplinary management. Many etiologies exist, among which injection of drugs or substances, in any anatomical localization, leading to variable loss of substance. The use of a free flap for acute extravasation is rare but sometimes essential. The anterolateral thigh flap allows good resurfacing on areas with important functional requirements.

Predictors for limb amputation and reconstructive management in electrical injuries

BACKGROUND

Electrical injuries follow a specific pathophysiology and may progressively damage both skin and deeper tissues, frequently ending in amputations. Type and timing of soft tissue reconstruction after electrical burns is crucial for proper outcome. The aim of this study was to assess surgical management and outcome of patients with electrical injuries treated at the Zurich Burn Center over the last 15 years, with emphasis on risk factors for amputation and reconstructive strategy.

METHODS

Patient charts were reviewed retrospectively to identify cases admitted at the Zurich Burns Center (2005-2019). Patient characteristics and surgical management, with a special focus on amputations, reconstruction and outcome were analyzed and risk factors for amputation were assessed.

RESULTS

Eighty-nine patients were identified and a total of 522 operations were performed. Escharotomy and fasciotomies were performed in 40.5% and 24.7% of cases, respectively, mainly at admission. The total amputation rate was 13.5% (23 amputations, 12 patients). Development of compartment syndrome, rhabdomyolysis, high myoglobin and CK blood levels, kidney failure, sepsis and respiratory complications during the course were related to higher risk of amputation (p < 0.001). Sixty-six flap-based reconstructions were performed (25% cases): 49 loco-regional flaps, 3 distant pedicled flaps, 14 free flaps. Two flaps were lost (flap failure rate 14%). Both flap losses occurred in cases of early reconstruction (within 5-21 days).

CONCLUSIONS

Electrical injuries are still cause of elevated morbidity and mortality, with high amputation rate. Predictors for amputation can support physicians in the surgical care and decision-making. Reconstruction remains challenging in this type of injury: the surgical management with early decompression, serial necrectomies and delayed early reconstruction remains the procedure of choice at our unit.

Free tissue transfer for burns reconstruction: A single-site experience

This study reviews free tissue transfer (FTT) surgery for both acute wound and reconstructive scar management of burn injuries at a UK burns unit over a 10-year period. Thirty eight patients underwent 46 FTTs, or free flaps, as part of their burn injury pathway. For the cohort of patients, there was one flap failure, which occurred for a secondary scar reconstruction. It is noted that FTT was successful for all seven acute or primary interventions. Anterolateral thigh flap was the most frequently performed (57%); followed by parascapular flaps (22%) of which 43% were pre-expanded. A method of pre-expansion for neck contractures and a novel technique of anchoring this flap to the pre-tracheal fascia are described here. This can provide the patient with good neck contouring by using the capsule to hitch the flap into a good position. It is clear that further work is required to study the prevention of hypertrophic scarring that can occur at the interface between flap and adjacent skin, where occurrence rate in this cohort was 17%. It is proposed that FTT now provides a viable solution both to the coverage of complex burn wounds and to the revision of scar contractures. Consensus over an FTT protocol for the primary management of open burn wounds is seen as the logical next step for this surgical intervention.

Early Application of Microsurgical Flaps in the Electric Burns of Extremities: A Two Institutional Case Series

Some groups have avoided early microsurgical flaps in electrical burns under the pretext of injury to the microvasculature, which could increase vascular thrombosis. However, this option frequently results in amputation of the extremity. This study aims to evaluate the early application of microsurgical flaps for the treatment of electrical burns of extremities. A case series was retrospectively evaluated including patients with electrical trauma in extremities undergoing early microsurgical reconstruction. Data were obtained from medical charts, including age, trauma location, flap type and microvascular anastomosis, the need for other procedures, postoperative complications, the length of hospital stay after the flap surgery, and patient outcomes. Five microsurgical flaps were performed in less than 30 days to trauma, one anterolateral thigh flap to cover skin failure in upper limb, and four radial forearm flaps to cover failure in feet. The patient ages had a mean of 25.8 years (from 12 to 42 years). The microsurgical procedure occurred from 21 to 27 days after the burn, with a mean of 24.2 days. Hospital discharge had a mean of 26.6 days (from 19 to 35 days after the surgery). Only one patient required reintervention for re-anastomosis. All patients had a good flap viability, avoiding amputation of the affected extremity and with a proper preservation of function. The early application of microsurgical flaps for patients with electrical burns of extremities may provide adequate, sturdy, and stable skin coverage, contributing to the treatment of noble structures exposed and avoiding amputation of the extremities.

Free-style puzzle flap as a cross-leg pedicled flap: the concept of re-using a flap in acute burns, a case report

Background

In well-selected cases, flaps can play a pivotal role in optimizing outcomes in the acute phase of burns. A previous redundant flap could be reused or recycled as a donor site from which a new flap could be raised.

Case presentation

We report the case of a patient with full thickness burns on both legs, leading to the exposure of joints of the right ankle and the right foot and left patellar tendon. The right lower extremity was covered with a free musculo-cutaneous latissimus dorsi flap. Then, a musculo-cutaneous cross-leg flap pedicled on the anterior branch and centered on a perforator was harvested from the previous redundant flap to cover the controlateral knee.

Conclusion

Sequential flap coverage can be considered in cases of extensive soft tissue defects and particularly in burns. This case illustrates that re-using a redundant part of a previous flap to cover another defect is a safe and interesting alternative in the event of a lack of donor sites or to save donor sites for later reconstruction of contracted burn scars.

Microvascular free tissue transfer in acute and secondary burn reconstruction

INTRODUCTION

The mainstay of operative treatment in burns is split skin grafting with free tissue transfer being indicated in a minority of cases. However, free tissue transfer faces a number of challenges in the burns patient. These include; overall cardiovascular and respiratory stability of the patient, availability of suitable vessels for anastomosis, sufficient debridement of devitalised tissue and a potentially increased risk of infection. We carried out a retrospective study in order to determine the indications, timing, principles of flap selection, complications, outcomes and methods of promoting flap survival when free tissue transfer was utilised for burn reconstruction in our unit.

MATERIALS AND METHODS

All patients who underwent soft tissue reconstruction for burn injuries with microvascular free tissue transfer between May 2002 and September 2014 were identified from our burns database. The records of these patients were then retrospectively reviewed. Data extracted included, age, gender, type of injury, total body surface area involved, indications for free tissue transfer, anatomical location, timing of reconstruction, complications and flap survival.

RESULTS

Out of a total of 8776 patients admitted for operative treatment over a 12-year period, 23 patients required 26 free flaps for reconstruction. Out of 26 free flaps, 23 were utilised for acute burn reconstruction while only 3 free flaps were utilised for secondary burn reconstruction. All 26 free flaps survived regardless of timing or burn injury mechanism. Complications included haematomas in 2 flaps and tip necrosis in 4 flaps. Two flaps required debridement and drainage of pus, 1 flap required redo of the venous anastomosis while 1 required redo of the arterial anastomosis with a vein graft.

CONCLUSIONS

Free tissue transfer has a small but definite role within acute and secondary burn reconstruction surgery. Despite the complexity of the burn defects involved, free flaps appear to have a high success rate within this cohort of patients. This appears to be the case as long as the appropriate patient and flap is selected, care is taken to debride all devitalised tissue and due diligence paid to the vascular anastomosis by performing it away from the zone of injury.

The treatment of bone exposure in burns by using artificial dermis

BACKGROUND

The treatment of bone-exposed wounds with artificial dermis is not widely accepted in burn patients because of uncertain clinical results. This article aimed to review our clinical experience with this technique.

METHODS

We implanted artificial dermis in 11 bone-exposed burns. Implantation was directly performed on bones with periosteum, whereas bones without periosteum were trephinated or burred before implantation. All wounds were closed by secondary skin grafting.

RESULTS

The mean patient age was 49 years. Lower extremity is the most common site of bone exposure. The mean bone exposed area was 55.6 cm, whereas the mean Integra-implanted area was 86.7 cm. The overall implant take rate was 91%, and the skin grafting success rate was 80%. No secondary breakdown was noted after a 2-year follow-up.

CONCLUSIONS

This study confirms that artificial dermis can be an alternative treatment tool for burns with exposed bones, especially in patients with limited donor sites.