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Biomedical subjects

Angela Otto-Schoeller

Publications and source records attributed to Angela Otto-Schoeller.

7 recordsLinked to original sources
PubMed2004

Management of subcostal scars during DIEP-flap raising.

The lower abdomen continues to be the favourite donor site for free tissue transplantation in autologous breast reconstruction. The deep inferior epigastric artery (DIEP)-flap has revolutionised microsurgical reconstruction of the breast after mastectomy. However, previous abdominal operations with resulting subcostal scars limit the use of this flap due to possible severe complications such as fat necrosis or wound break down at the donor site. We present a method to avoid such problems that could equally be applied in simple abdominoplasties under similar conditions. After harvest of the DIEP-flap the cephalad wound edge has to be undermined for direct wound closure. Instead of ligating encountered perforating vessels, one of these perforators is prepared and left intact to provide perfusion for the distal part of the cranial abdominal flap below the scar. With this technique, the DIEP-flap can be harvested safely even in the presence of abdominal scars and, thus, is not contraindicated under these circumstances any longer.

Abdomen↗
PubMed2004

Capsule induction technique in a rat model for bladder wall replacement: an overview.

The search for a reliable technique for functional genitourinary tissue replacement remains a challenging task. The most recent advances in cell biology and tissue engineering have utilized various avascular and acellular collagen scaffolds with or without seeded cells. These techniques, however, are frequently complicated by tissue necrosis, contracture and resorption due to limited vascularization. We employed a new three-stage, evolving animal model with stage I optimizing the culture delivery vehicle, stage II employing a seeded vascularized capsule flap, and stage III adding a contractile matrix in the form of pedicled gracilis muscle prelaminated with autologous, in vitro-expanded urothelial cells to reconstruct an entire supratrigonal bladder-wall defect in rats.Specimens stained with hematoxylin and eosin (H&E), alpha(1)-actin staining, and a specific immunohistochemical staining (AE(1)&AE(3)-anticytoceratin monoclonal antibody stain) showed a continuous, multilayered, functioning urothelial lining along the transposed prelaminated gracilis flap in the animals of the final-stage experiment. Successful urinary reconstruction requires a contractile neoreservoir resistant to resorption over time and a stable, protective urothelial lining. We demonstrated that a gracilis muscle flap can be seeded with autologous cultured urothelial cells suspended in fibrin glue. This prelaminated flap can be safely transposed onto its pedicle and become successfully integrated into the remaining bladder wall, demonstrating urothelial lining and the potential to contract. Further studies in larger animals with urodynamic assessment is warranted to determine if this type of bladder-wall replacement technique is suitable for urinary reconstruction in humans.

Animals↗
PubMed2003

Modified free paraumbilical perforator flap: the next logical step in breast reconstruction.

The free paraumbilical perforator flap that was developed with only the perforator penetrating the rectus abdominis muscle seems nearly ideal from the donor-site perspective, because it reduces morbidity virtually to that of an abdominoplasty. However, it requires "supermicrosurgery" skills for suturing of vessels with diameters of 0.7 mm or less, making the procedure technically demanding and risky. Another significant disadvantage of that technique is that the flap has very short vascular pedicles. To overcome the disadvantages of the free paraumbilical perforator flap, a minor modification in flap harvesting that improves the vessel size and length is described. Results for a total of 15 patients who underwent breast reconstruction with modified free paraumbilical perforator flaps are presented, and the advantages and disadvantages of this flap are discussed.

Adult↗
PubMed2003

Improved dorsal random-pattern skin flap survival in rats with a topically applied combination of nonivamide and nicoboxil.

The effects of a topically applied combination of nonivamide and nicoboxil in improving skin perfusion and preventing distal flap necrosis were tested in a random-pattern dorsal skin flap model. Forty male Wistar rats were randomized into two groups (n = 20), and a standardized dorsal random-pattern skin flap was raised on each rat. Animals in the experimental group were treated with the topically applied drug combination four times per day for 6 days, whereas in the control group only a placebo ointment was applied each time. Skin flap viability was evaluated on day 7, and the extent of skin flap necrosis was compared between the two groups. The topically applied combination of nonivamide and nicoboxil resulted in a statistically significant decrease in skin flap necrosis, compared with the control group (mean percentage of skin flap necrosis in the nonivamide/nicoboxil-treated group, 22.6 +/- 6.0 percent; control group, 36.8 +/- 4.3 percent; p< 0.05). The topical combination of nonivamide and nicoboxil was effective in reducing ischemic necrosis in failing random-pattern skin flaps in this rat model. The results of this study suggest that such a topical drug application might have significant effects in the reduction of ischemic necrosis in the distal parts of skin flaps, and this treatment might also have applications as prophylactic therapy for risky skin flaps.

Administration, Topical↗
PubMed2002

Medial thigh lift free flap for autologous breast augmentation after bariatric surgery.

BACKGROUND: Massive weight loss following bariatric surgery frequently results in body contour deformities like ptotic and hypoplastic breasts, redundant abdominal tissue and loose skin especially in the medial thigh area. This redundant tissue can be used for breast augmentation in the case of hypertrophic ptotic breasts. METHOD: In 3 patients who underwent a vertical banded gastroplasty and consecutively lost more than 60% of their body weight, a breast augmentation with a transverse gracilis myocutaneous free flap was performed. RESULTS: Bilateral myocutaneous gracilis free flap breast augmentation resulted in an esthetic, pleasing result, with additional correction of the redundant skin from the medial thigh region. CONCLUSION: Autologous breast augmentation with a simultaneous medial thigh lift can be performed safely, after successful weight loss following bariatric surgery.

Adipose Tissue↗