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Biomedical subjects

Edward W Chang

Publications and source records attributed to Edward W Chang.

5 recordsLinked to original sources
PubMed2006

Liposarcoma of the tongue: case report and review of the literature.

BACKGROUND: Liposarcoma most commonly arises in the retroperitoneum and lower extremities. Liposarcoma of the head and neck is rare, with only 12 previously reported cases of liposarcoma in the tongue. CASE PRESENTATION: We present a case of well-differentiated liposarcoma of the tongue occurring in a 39 year old man, treated with surgical excision. At 14 years of follow-up, the patient remains free of disease. CONCLUSION: Liposarcoma of the head and neck is rare, and may easily be misdiagnosed clinically. The diagnosis is made histologically. Clinical behavior is related to histopathologic subtype. Wide surgical excision is the treatment of choice, with limited data to support the use of radiation or chemotherapy. Our case represents the longest follow-up period for a tongue liposarcoma, with 14 years disease-free following surgical extirpation.

Adult↗
PubMed2005

Orbital floor fracture management.

Orbital floor fractures can occur in isolation or in conjunction with other facial skeletal fractures. They are commonly associated with midface fractures and, in this region, are second only to nasal fractures in occurrence. The integrity of the orbit and its contents must be preserved to prevent complications after alterations secondary to trauma. There is a plethora of literature on different reconstruction methods. Autogenous bone and cartilage grafts from various areas have been used in the reconstruction of the floor. In addition, materials such as high-density porous polyethylene, silicone, and titanium mesh have also been used. Each has its own benefits and limitations. The lack of stabilization and improper posterior placement of the reconstruction implant have caused less-than-ideal repairs. Graft stabilization can be accomplished with titanium screw fixation, and recently the endoscope has facilitated the visualization of the entire defect and helped ensure the proper placement of the implant.

Biocompatible Materials↗
PubMed2002

Evaluation of endotracheal tube safety for CO2 laser resurfacing.

OBJECTIVES: The new generation carbon dioxide lasers have become popular as a result of their ease of use and consistent results. Their use is becoming widespread with both the experienced laser surgery clinician and those just venturing into the realm of laser resurfacing. The purpose of this study was to evaluate the safety of the common PVC endotracheal and one designed for laser procedures if contacted by the CO2 laser during resurfacing. In addition, the cost and efficacy of a simple covering to the PVC tube was assessed. STUDY DESIGN: Endotracheal tubes were subjected to multiple passes of the Coherent Ultrapulse laser system while recording tube effect and intraluminal temperature. METHOD: With the highest energy densities used in our practice, multiple passes were made over both PVC and Xomed Laser-Shield II endotracheal tubes with 100% intraluminal oxygen. Thermocouplers recorded both inflow and outflow temperatures. The procedure was repeated with PVC endotracheal tubes covered with saline-soaked sponges held in place with netting. RESULTS: Charring of the PVC tube occurred after 1 pass, and intraluminal smoke was present after 21.6 passes. The Laser-Shield II and the wrapped PVC tube did not show significant charring or tube lumen breach after up to 200 passes. The prepared PVC tube was $105.14 less than the commercial tube. CONCLUSIONS: Our method of PVC endotracheal tube preparation provides a safe, inexpensive, reliable airway during CO2 laser resurfacing.

Carbon Dioxide↗