Koenraad Van Landuyt

Doppler flowmetry in the planning of perforator flaps

Perforator flaps have become the first choice in free flap reconstruction of contour defects or skin and fat replacement in our department. The Deep Inferior Epigastric Perforator (DIEP), the Superior Gluteal Artery Perforator (S-GAP) and the Thoracodorsal Artery Perforator (TAP) flaps are now routinely used. By evaluating the vascular anatomy of these flaps preoperatively, we intend to improve our surgical strategy so that these operative procedures can proceed in a faster and safer way. In this study, the results of the colour Duplex scanning in 50 consecutive DIEP flap patients are reviewed and evaluated for their sensitivity and positive predictive value. Also the preoperative information from unidirectional Doppler flowmetry in 30 S-GAP flaps and 11 TAP flaps is evaluated for its reliability. Due to the variable vascular anatomy of the lower abdominal wall and the dorso-lateral thoracic wall we now prefer using the colour Duplex scanning for planning the DIEP and TAP flaps. The more constant course of the branches of the superior gluteal artery allows us to use the easier and cheaper unidirectional Doppler flowmetry for planning the S-GAP flap.

Venous congestion and blood flow in free transverse rectus abdominis myocutaneous and deep inferior epigastric perforator flaps

&NA; A series of 240 deep inferior epigastric perforator (DIEP) flaps and 271 free transverse rectus abdominis myocutaneous (TRAM) flaps from two institutions was reviewed to determine the incidence of diffuse venous insufficiency that threatened flap survival and required a microvascular anastomosis to drain the superficial inferior epigastric vein. This problem occurred in five DIEP flaps and did not occur in any of the free TRAM flaps. In each of these cases, the presence of a superficial inferior epigastric vein that was larger than usual was noted. It is therefore suggested that if an unusually large superficial inferior epigastric vein is noted when a DIEP flap is elevated, the vein should be preserved for possible use in flap salvage. Anatomical studies with Microfil injections of the superficial venous system of the DIEP or TRAM flap were also performed in 15 cadaver and 3 abdominoplasty specimens to help determine why venous circulation (and flap survival) in zone IV of the flaps is so variable. Large lateral branches crossing the midline were found in only 18 percent of cases, whereas 45 percent had indirect connections through a deeper network of smaller veins and 36 percent had no demonstrable crossing branches at all. This absence of crossing branches in many patients may explain why survival of the zone IV portion of such flaps is so variable and unpredictable. (Plast. Reconstr. Surg. 106: 1295, 2000.)

Accuracy of early burn depth assessment by laser Doppler imaging on different days post burn

BACKGROUND Accurate diagnosis of burn depth is essential in selecting the most appropriate treatment. Early assessment of burn depth by clinical means only has been shown to be inaccurate, resulting in unnecessary operations or delay of grafting procedures. Laser Doppler imaging (LDI) was reported as an objective technique to determine the depth of a burn wound, but the accuracy on very early days post burn has never been investigated yet. METHODS In 40 patients with intermediate depth burns, we prospectively evaluated and compared the accuracy of the LDI measurements with the clinical assessments on days 0, 1, 3, 5, 8. Clinical evaluation of the depth of the burn was performed by two observers blinded to the LDI images. Accuracies were assessed by comparison with outcome: healing times longer than 21 days were considered to be equivalent to a biopsy finding of a deep dermal wound. Obviously superficial and full thickness wounds were excluded. LDI flux level was used for LDI prediction of outcome: less than 220PU to predict non-healing at day 21. RESULTS The accuracies of burn depth assessments on the day of burn and post burn days 0, 1, 3, 5 and 8 using LDI were 54%, 79.5%, 95%, 97% and 100% compared with clinical assessment accuracies of 40.6%, 61.5%, 52.5%, 71.4% and 100%, respectively. LDI accuracy was significantly higher than clinical accuracy on day 3 (p<0.001) and day 5 (p=0.005). Burn depth conversion was also considered. This is the first study to quantify the advantage of LDI scanning over clinical assessments during these important early after burn days.

Penile reconstruction: is the radial forearm flap really the standard technique?

Background: The ideal goals in penile reconstruction are well described, but the multitude of flaps used for phalloplasty only demonstrates that none of these techniques is considered ideal. Still, the radial forearm flap is the most frequently used flap and universally considered as the standard technique. Methods: In this article, the authors describe the largest series to date of 287 radial forearm phalloplasties performed by the same surgical team. Many different outcome parameters have been described separately in previously published articles, but the main purpose of this review is to critically evaluate to what degree this supposed standard technique has been able to meet the ideal goals in penile reconstruction. Results: Outcome parameters such as number of procedures, complications, aesthetic outcome, tactile and erogenous sensation, voiding, donor-site morbidity, scrotoplasty, and sexual intercourse are assessed. Conclusions: In the absence of prospective randomized studies, it is not possible to prove whether the radial forearm flap truly is the standard technique in penile reconstruction. However, this large study demonstrates that the radial forearm phalloplasty is a very reliable technique for the creation, mostly in two stages, of a normal-appearing penis and scrotum, always allowing the patient to void while standing and in most cases also to experience sexual satisfaction. The relative disadvantages of this technique are the rather high number of initial fistulas, the residual scar on the forearm, and the potential long-term urologic complications. Despite the lack of actual data to support this statement, the authors feel strongly that a multidisciplinary approach with close cooperation between the reconstructive/plastic surgeon and the urologist is an absolute requisite for obtaining the best possible results.

The lateral intercostal artery perforators: anatomical study and clinical application in breast surgery.

Background: The lateral intercostal artery perforator flaps are based on intercostal perforators that arise from the costal groove. Cadaver dissections have been performed to improve the understanding of lateral intercostal perforator anatomy. The clinical applications of this study are demonstrated. Methods: The intercostal perforators were dissected in 24 fresh cadavers and evaluated in a field that extended between the third and the eighth intercostal spaces and between the latissimus dorsi and pectoralis major muscles. Their relationship with the anterior border of the latissimus dorsi muscle and the serratus anterior vessels was investigated. Results: A mean value of 3.91 perforators per side was found. The majority of the intercostal perforators were found between the fifth and the eighth intercostal space level (88.4 percent). Mean distances of intercostal perforators to the anterior border of the latissimus dorsi muscle varied between 2.67 and 3.49 cm. The largest or “dominant” perforator was most frequently found in the sixth intercostal space (38.6 percent of cases) at an average of 2.5 to 3.5 cm from the anterior border of the latissimus dorsi muscle. In 10 of 47 sides (21 percent), vascular connections were found between the serratus anterior branch and the intercostal perforators. The connection was observed more frequently in the seventh and the sixth intercostal spaces, in 38 percent and 30 percent of cases, respectively. This vascular connection enables harvest of a serratus anterior artery perforator flap. Conclusion: Lateral intercostal artery perforator flaps can be used to address challenging defects over the breast without sacrificing the pedicle of the latissimus dorsi muscle.

The versatility of the pudendal thigh fasciocutaneous flap used as an island flap.

The pudendal thigh flap is a sensate fasciocutaneous flap based on the terminal branches of the superficial perineal artery, which is a continuation of the internal pudendal artery. Several authors have reported using this axial patterned flap in a bilateral fashion to reconstruct the vagina, mostly in patients with vaginal atresia. The technique is simple, safe, and reliable, and no stents or dilators are required. The reconstructed vagina has a natural angle and is sensate. The donor site in the groin can be closed primarily with an inconspicuous scar. The distinct advantages of this flap widen its indications to several other pathologies. In this article, the authors report on the bilateral use of the flap to reconstruct a vagina in patients with congenital atresia (n = 8) and after oncological resection (n = 5). Furthermore, the versatility of this island flap is also demonstrated by its use in a unilateral fashion in patients with recurrent or complex rectovaginal fistulas (n = 4) and in two patients with a defect of the posterior urethra in a heavily scarred perineum. All 31 pudendal thigh flaps survived completely. Some wound dehiscence was observed in two patients. Two other patients required a minor correction at the introitus of the vagina. The functional outcome was excellent in all patients, despite the presence of some hair growth in the flaps. This article discusses the expanding indications of this versatile flap and the refinements in operative technique. (Plast. Reconstr. Surg. 107: 719, 2001.)

Chest-wall contouring surgery in female-to-male transsexuals: a new algorithm.

Background: In female-to-male transsexuals, the first surgical procedure in their reassignment surgery consists of the subcutaneous mastectomy. The goals of subcutaneous mastectomy are removal of breast tissue, removal of excess skin, reduction and proper positioning of the nipple and areola, and ideally, minimization of chest-wall scars. The authors present the largest series to date of female-to-male transsexuals who have undergone subcutaneous mastectomy. Methods: A total of 184 subcutaneous mastectomies were performed in 92 female-to-male transsexuals, using the following five techniques: semicircular, transareolar, concentric circular, extended concentric circular, and free nipple graft. The technique used depended on the breast size and envelope, the aspect and position of the nipple-areola complex, and the skin elasticity. To best meet the goals of creating a normal male thorax, the authors have developed an algorithm to aid in choosing the appropriate procedure. Results: The overall postoperative complication rate was 12.5 percent (23 of 184 subcutaneous mastectomies), and in eight of these cases (4.3 percent), an additional operative intervention was required because of hematoma, infection, and/or wound dehiscence. Despite this low complication rate, additional procedures for improving aesthetic results were performed on 59 breasts (32.1 percent). The semicircular and concentric circular techniques produced the highest rating of the overall result by patient and surgeon, whereas the extended concentric circular technique produced the lowest rating. Conclusions: Skin excess and skin elasticity are the key factors in choosing the appropriate technique for subcutaneous mastectomy, which is reflected in the algorithm. Although the complication rate is low and patient satisfaction is high, secondary aesthetic corrections are often indicated.

The efficacy of preoperative mapping of perforators in reducing operative times and complications in perforator flap breast reconstruction

Reconstruction using perforator flaps can be technically demanding and in inexperienced hands may result in longer operative times and increased costs. This has implications for the postoperative recovery of patients as well as associated complications such as atelectasis and deep vein thrombosis. This study examined different aspects of perforator flap reconstruction including operative times, ischaemia time, flap re-exploration rate, complications and inpatient length of stay. The mean operative times were as follows: for Deep Inferior Epigastric Artery Perforator (DIEAP) flaps it was 4 h 49 min (n=17), for bilateral DIEAP it was 7 h 23 min (n=12) and for SGAP it was 4 h 56 min (n=2). Since CT preoperative perforator mapping was introduced it has resulted in a mean reduction of operative time by 1 h 16 min (21%). This has also led to costs saving of 471 pounds sterling per patient. Preoperative mapping of perforators can reduce operative times as well as allowing the selection of the most reliable perforators beforehand. Good flap perfusion is assured which leads to reduced length of stay as well as fewer complications such as postoperative fat necrosis and delayed healing. Reduced operative times also contribute to major cost savings for the hospital. Although both CT and Duplex perforator mapping can reduce operative times, this study found that operative times were reduced more after CT scanning was introduced.

Shoulder Function after Harvesting a Thoracodorsal Artery Perforator Flap

Background: Converting the latissimus dorsi musculocutaneous flap to a thoracodorsal artery perforator flap has been reported for breast reconstruction. The goal of this article is to evaluate the donor site after harvesting a thoracodorsal artery perforator flap in patients who underwent breast surgery and to show the advantages of sparing the latissimus dorsi muscle on the function of the shoulder. Methods: Between 2002 and 2004, 22 patients who had a partial breast reconstruction using a pedicled thoracodorsal artery perforator flap were enrolled in a functional study to evaluate shoulder function postoperatively. Latissimus dorsi muscle strength, shoulder mobility, and latissimus dorsi thickness were measured by using the MicroFet2, a goniometer, and ultrasound examination, respectively. The measurements of the operated and contralateral (unoperated) sides were analyzed statistically. Results: When comparing the operated sides to the unoperated sides, latissimus dorsi strength seemed to be maintained after surgery. Shoulder mobility was also similar in all movements, but both active and passive forward elevation and passive abduction were reduced significantly after surgery, and latissimus dorsi thickness was not affected by harvesting the thoracodorsal artery perforator flaps. No seroma formation was found in any of the donor sites. Conclusions: Donor-site morbidity after harvesting a thoracodorsal artery perforator flap was reduced to a minimum. Therefore, perforator flaps should be considered in reconstruction whenever adequate perforators can be identified and safely dissected.

Advances in Autogenous Breast Reconstruction: The Role of Preoperative Perforator Mapping

Autogenous tissue is preferred to implants for breast reconstruction because it is part of the patients body, so it does not incite rejection reaction as implants do. Most of the flaps used for breast reconstruction consist of skin and fat. These ingredients have similar consistency to that of