Dennis R. Banducci

Negative-pressure dressings as a bolster for skin grafts.

Contoured wounds needing closure with skin grafts are often located in complex anatomic regions or are in unusual positions, which make conventional skin graft stabilization techniques cumbersome and ineffective. Often after 72 hours, a skin graft covered with a bolstered dressing has poor take secondary to shear stresses, as well as hematoma formation or serum collection, negating the effectiveness of the stabilizing dressing. The Food and Drug Administration has recently approved vacuum-assisted closure (V.A.C.), an innovative technique using negative pressure, for closure of chronic wounds. This reportedly leads to enhanced granulation tissue formation and consequently more rapid reepithelialization of wounds compared with conventional packing with saline-moistened gauze. Experimental studies have demonstrated increased oxygen tension, decreased bacterial counts, and increased granulation formation occurring under negative-pressure systems. Extending the use of this concept, we have coupled skin grafting with negative-pressure dressings for closure of large, complex open wounds. Our results indicate greater than 95% graft take in all patients in this study. This technique is extremely efficacious, with increased graft take due to total immobilization of the graft, thereby limiting shear forces, elimination of fluid collections, bridging of the graft, and decreased bacterial contamination. Moreover we have noted decreased edema in rotated muscle flaps, improved contour conformity, and shortened hospitalizations.

Aeromonas species isolated from medicinal leeches.

Aeromonas hydrophila infections are a recognized complication of the use of medicinal leeches. The authors performed an experiment designed to find a safe and practical way to sterilize the leech gut of pathogenic organisms. Leeches were incubated for a 12-hour period in solutions of antibiotic effective against A. hydrophila. The incubations in the antibiotic solutions failed to eradicate pathogenic bacteria from the gut of the leeches. The authors examined cultures of bacteria isolated from the guts of the commonly used Hirudo medicinalis (European leech) and found a wide variety of pathogenic organisms. A. hydrophila is widely believed to be the most common enteric pathogen, but the authors found A. sobria more frequently in their experiment. They also cultured the guts of the leech H. michaelseni recently used clinically in South Africa. A. caviae was the most common pathogen encountered in these leeches. A. caviae and A. sobria cause a spectra of disease similar to A. hydrophila. The authors endorse the current recommendation that all patients who have leech therapy for congested flaps or replants receive broad-spectrum prophylactic antibiotics. This appears to be the safest and simplest way to prevent leech-related infections.

Microvascular anastomosis using 2-octyl cyanoacrylate in the rat femoral artery.

&NA; Patency of the microvascular anastomosis is the most important requirement for tissue survival in free tissue transfer and in replantation. In efforts to improve on the standard suture method of microvascular anastomosis, new techniques such as limitedsuture sleeve anastomoses and histoacryl glue anastomoses have been employed experimentally. However, as a result of factors such as tissue toxicity and suboptimal outcome, cyanoacrylates have not enjoyed clinical use. In addition, sleeve anastomoses continue to utilize suture, increasing the risks of intimal damage, platelet adhesion, and thrombosis. In an attempt to surmount these problems, the authors investigated the use of a new 2‐octyl cyanoacrylate glue and a sutureless sleeve anastomosis. Anastomosis of 20 rat femoral arteries with a sutureless sleeve technique bonded with glue resulted in an 80% patency rate at 1 day to 3 weeks. Failures occurred in the first few attempts as the technique was evolving. These encouraging results suggest that 2‐octyl cyanoacrylate may have applicability in quick, sutureless microvascular anastomoses.

Routine drainage is not required in reduction mammaplasty

&NA; To date, there have been no randomized trials documenting the efficacy of closed suction drainage when applied to reduction mammaplasty. Despite this, it has become the standard of care. A recent retrospective review suggests that closed suction drainage is not necessary. This study attempts to resolve this issue in a prospective, randomized fashion. The Institutional Review Board of the College of Medicine of The Pennsylvania State University approved the study. Forty‐nine consecutive patients who underwent reduction mammaplasty by the inferior pedicled techniques were enrolled. Each patient was randomized to having a drain in either the right or left breast. The other breast was undrained. Patients were followed up for rate of complications and for patient satisfaction. Their ages ranged from 17 to 62 years, with a mean of 33 years. Weight of reduction from the drained breasts ranged from 360 to 1090 g, with a mean reduction of 675 g. Weight of reduction from the undrained group ranged from 380 to 1011 g, with a mean of 620g. There were a total of 11 complications in the study. In the drained group, there were six complications out of 49 breasts (partial nipple loss in one, minor wound breakdown in two, fat necrosis in two, and hematoma in one). In the undrained group, there were five complications out of 49 breasts (partial nipple loss in none, minor wound breakdown in three, fat necrosis in one, and hematoma in one). Statistical analysis using the McNemar test revealed no significant difference between the two groups. A questionnaire revealed that the patients preferred the increased early postoperative comfort afforded by the absence of a drain. Performing reduction mammaplasty without the use of closed suction drainage is safe and is preferred by the patients. (Plast. Reconstr. Surg. 111: 113, 2003.)

Dupuytren's disease: physiologic changes in nodule and cord fibroblasts through aging in vitro.

The pathogenesis of the fibrotic disease Dupuytrens contracture remains unclear. The disease process includes two structurally distinct fibrotic elements, the nodule and the cord. It has been proposed that as the disease progresses, nodules develop into cords. To corroborate that hypothesis, the authors took advantage of cultured fibroblast differences found between gap junction intercellular communication and fibroblast-populated collagen lattice contraction. Paired fibroblast cell lines of nodules and cords derived from four patients with Dupuytrens disease were maintained in culture for at least eight passages. The presence of gap junction intercellular communication in nodule- and cord-derived fibroblasts was documented and reported as a coupling index. The contraction of free-floating nodule- or cord-derived collagen lattices was also documented and reported. Early passage (passage 4) cord-derived fibroblasts showed a significant increase in coupling index compared with passage 4 nodule-derived fibroblasts (4.0 +/- 0.4 versus 2.5 +/- 0.3, respectively), where p < or = 0.01. However, late passage (passage 8) nodule- and cord-derived fibroblasts were equivalent in their coupling index (4.1 +/- 0.4 versus 4.4 +/- 0.4, respectively). Early passage nodule-derived fibroblast-populated collagen lattices contracted by 64 percent, whereas late passage nodule-derived lattices showed less contraction, at only 40 percent. Early and late passage cord-derived lattices contracted 46 and 37 percent, respectively. All nodule- and cord-derived cell lines were statistically equivalent at lattice contraction by passage 8. These in vitro studies support the hypothesis that fibroblasts derived from Dupuytrens contracture nodules change their phenotype after undergoing repeated cell passage, acquiring a cord-like fibroblast phenotype. Dupuytrens nodules represent the early, active form of fibrosis in which cells are more proliferative, better at fibroblast-populated collagen lattice contraction, and display less gap junction intercellular communication. The speculation is that alterations in gap junction intercellular communication may be involved in the progression of Dupuytrens nodules to cords as the disease progresses.

Pre-Reconstruction Tattooing Eliminates the Need for Skin Grafting in Nipple Areolar Reconstruction

Tattooing the skin of the reconstructed breast as a prelude to reconstruction of the nipple provides a nipple areolar reconstruction that has a uniform color. There is no requirement for a skin graft donor site. Tedious tattooing of the nipple papule is avoided. It is much easier to tattoo a flat surface than a projecting papule, and this technique gives a more uniform color. We believe that this approach to nipple areolar reconstruction provides a simpler, dependable technique.

Pulp nonfiction: Microscopic anatomy of the digital pulp space

The volar pad of the fingertip provides a very stable yet sensitive surface that gives the hand the ability to pinch and grasp. The focus of this study was to advance understanding of the anatomical features of the digital pulp space. The unusual features of the fingertip pulp space include prominent collagen fiber cords and a branching continuous fine vasculature. Prominent collagen fiber cords radiating out from beneath the epidermal basement membrane are like the cords of a parachute, which directly attach to the periosteum of the distal phalanx. Those collagen fiber cords are responsible for the firm attachment of the fingertip to the distal phalanx. There is a fine patent vasculature within the pulp space. Also contained in the capsule are numerous lobules of fat, which contribute to some elasticity of the fingertip. Principles of treatment for injuries or infections of the digital pulp should attempt to preserve this anatomical construct so that the firmness and vascular supply of the fingertip are maintained and not disrupted.

Sensibility of finger fillet flaps on late follow-up evaluation*

Though the use of fillet flaps salvaged from damaged digits is a well-established technique to obtain soft tissue coverage for the badly injured hand, the sensibility of these flaps has not been evaluated. We examined a series of four patients who underwent digital fillet flaps following hand trauma. Static two-point discrimination measurements of the injured hand and the contralateral hand showed that all four patients retained sensibility in the fillet flap that was equal to or better than the intact skin surrounding the flap. In some cases, the sensibility of the flap was equal to the sensibility in the corresponding contralateral fingertips. No patients had complaints regarding the function of their fillet flaps as sensate coverage of major soft tissue defects.

Video microsurgery : Evaluation of standard laparoscopic equipment for the practice of microsurgery

Traditional microsurgery involves the use of bulky and expensive stereo microscopes that have limited portability. Recent advances in video technology have enabled the exploration of alternative visualization methods. The purpose of this study was to evaluate standard laparoscopic equipment for microvascular anastomoses. Eight surgeons completed anastomoses on rat femoral and synthetic vessels using stereo microsurgery and video microsurgery visualization systems. All surgeons had previous experience with stereo microsurgery and none had ever used video microsurgery. Data were collected on overall anastomosis and individual suture times. A sample of completed anastomoses was placed in a video database and evaluated by use of a quality rating scale (8 to 10, excellent; 6 to 7, adequate; less than 6, poor). All surgeons subjectively evaluated the video microsurgery system. A total of 48 anastomoses were completed. The average total anastomosis time for the stereo microsurgery was 1018.9 ± 463.2 seconds versus 1738.9 ± 460.1 seconds for the video microsurgery. The average individual suture placement time was 114.6 ± 60.6 seconds for the stereo microsurgery versus 211.7 ± 128.4 seconds for the video microsurgery (p < 0.05). Twenty‐five of the anastomoses underwent quality review. The overall score of the stereo microsurgery group was 8.1 ± 1.7, and the video microsurgery group had an overall score of 7.3 ± 1.6. Survey results revealed that 75 percent of the participants thought that the video microsurgery would be useful for human operations and would improve surgeon comfort, but 87.5 percent would not use the present video microsurgery system over stereo microsurgery in their practice. Although significant differences exist in overall anastomosis and individual suture completion times, no difference was found in the overall quality. Video microsurgery could become a useful tool on the basis of surgeon ergonomics; however, optical parameters require further refinement. (Plast. Reconstr. Surg. 108: 864, 2001.)

The natural history of a lipofibromatous hamartoma of the palm: A case report

Most lipofibromas in children occur in the upper extremity and involve the median nerve.le3 However, they may involve the ulnar nerve or even occur in the lower extremities. These benign tumors are hamartomas or benign growths consisting of mature tissues normally found in the affected location. We recently treated a patient in whom such a tumor had been present for most, if not all, of his 72 years and had not caused symptoms until shortly before we saw him.