Reconstruction of large nasal defects with a subcutaneous pedicle nasolabial flap. An underutilized technique

Repeated intramuscular transplantations of hUCB-MSCs improves motor function and survival in the SOD1 G93A mice through activation of AMPK

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease that is characterized by loss of motor neurons and degeneration of neuromuscular junctions. To improve disease progression, previous studies have suggested many options that have shown beneficial effects in diseases, especially stem cell therapy. In this study, we used repeated intramuscular transplantation of human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) and observed positive effects on muscle atrophy and oxidative stress. In an in vivo study, motor function, body weight and survival rate were assessed, and skeletal muscle tissues were analyzed by western blotting and immunohistochemistry. After intramuscular transplantation, the hUCB-MSCs survived within the skeletal muscle for at least 1 week. Transplantation ameliorated muscle atrophy and the rate of neuromuscular degeneration in skeletal muscle through reductions in intracellular ROS levels. Both expression of skeletal muscle atrophy markers, muscle atrophy F-box (MAFbx)/atrogin1 and muscle RING finger 1 (MuRF1), were also reduced; however, the reductions were not significant. Moreover, transplantation of hUCB-MSCs improved protein synthesis and inhibited the iNOS/NO signaling pathway through AMPK activation. Our results suggest that repeated intramuscular transplantation of hUCB-MSCs can be a practical option for stem cell therapy for ALS.

The midline-based nasolabial transposition (MNT) flap: an original single-stage technique for nasal tip reconstruction

BACKGROUND

Nasolabial flaps based on the lateral side of the nose for the reconstruction of lateral nasal defects in a single-stage procedure have been described. Similarly, in midline defects, nasolabial flaps can be used but a 2-stage procedure is classically required. The Midline-based Nasolabial Transposition (MNT) flap is presented as a new single-stage procedure for nasal tip reconstruction.

MATERIALS AND METHODS

Between 2009 and 2011, an MNT flap was used as a single-stage procedure in 3 cases of large nasal defects of the tip where the forehead flap was either contraindicated or rejected as an option by the patient.

RESULTS

There were no complications and a satisfactory aesthetic result was achieved in all cases.

CONCLUSIONS

The MNT flap is a new single-stage procedure for large nasal tip defects and as such represents an interesting alternative to the classical 2-stage forehead and nasolabial flaps, especially in elderly patients.

Single-stage interpolation flaps in facial reconstruction

BACKGROUND

Relatively deep and complex surgical defects, particularly when adjacent to or involving free margins, present significant reconstructive challenges. When the use of local flaps is precluded by native anatomic restrictions, interpolation flaps may be modified to address these difficult wounds in a single operative session.

OBJECTIVE

To provide a framework to approach difficult soft tissue defects arising near or involving free margins and to demonstrate appropriate design and execution of single-stage interpolation flaps for reconstruction of these wounds.

METHODS

Examination of our utilization of these flaps based on an anatomic region and surgical approach.

RESULTS

A region-based demonstration of flap conceptualization, design, and execution is provided.

CONCLUSION

Tunneled, transposed, and deepithelialized variations of single-stage interpolation flaps provide versatile options for reconstruction of a variety of defects encroaching on or involving free margins. The inherently robust vascularity of these flaps supports importation of necessary tissue bulk while allowing aggressive contouring to restore an intricate native topography. Critical flap design allows access to distant tissue reservoirs and placement of favorable incision lines while preserving the inherent advantages of a single operative procedure.

Prefabricated nasolabial flap for reconstruction of full-thickness distal nasal defects

BACKGROUND

The reconstruction of full-thickness nasal tip and alar defects is challenging owing to the distal nose's triple-layer structure: skin, cartilage, and mucosa.

OBJECTIVE

In the reconstruction of wounds of the distal half of the nose involving the rim, the most important issue to be considered is to provide a good functional and an acceptable esthetic result. Various local and distant flaps have been described for this purpose. The nasolabial flap is one of the most frequently used flaps in reconstruction of small- to moderate-size distal nasal defects. Its reliable blood supply, minimal donor site morbidity, and excellent texture and color match are some of the advantages of this local flap.

METHODS

In this study, superiorly based subcutaneous pedicled nasolabial flaps have been prefabricated with cartilage and skin grafts. This method has been used in 10 cases.

RESULTS

One patient had partial flap necrosis, and two patients experienced hyperpigmentation on the suture line. Scar revision was performed in one patient for hypertrophic scar tissue at the flap margins. No other complications were seen in the remaining patients. None of the patients experienced a skin graft loss or cartilage exposure.

CONCLUSION

The prefabricated nasolabial flap offers a superior esthetic and functional result and may be an appropriate reconstructive option in reconstruction of small- to moderate-size distal nasal defects.