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Biomedical subjects

D P Tahery

Publications and source records attributed to D P Tahery.

7 recordsLinked to original sources
PubMed1994

Decrease in skin-closing tension intraoperatively with suture tension adjustment reel, balloon expansion, and undermining.

BACKGROUND: The biomechanical and viscoelastic properties of the skin enable it to be significantly stretched within a relatively short period of time. This property, called mechanical creep, is exploited in various surgical maneuvers for intraoperative closure of large surgical defects. The recently introduced Miami Suture Tension Adjustment Reel (S.T.A.R.) device permits both the precise sutured attachment of a linear cycled load to approximate the edges of widened surgical defects, and the easy measurement of wound edge tension across the defects. OBJECTIVE: It was our purpose to compare the relative effects of linear load cycling with the S.T.A.R. device, spherical load cycling with balloon expander, and surgical undermining on the closing tension of surgical defects. METHOD: Surgical wounds were created on the flanks of six pigs and these defects were closed by various methods of repair. The combination of undermining and the S.T.A.R. device ws also evaluated. RESULTS: The average total decreases in skin closing tension were: undermining, 17.8 +/- 0.5%; balloon, 28.5 +/- 1.6%; S.T.A.R. device, 36.6 +/- 4.8%. CONCLUSION: Our data showed that all three techniques were effective in lowering the tension required to approximate surgically created defects, with the S.T.A.R. device proving to be most effective. Undermining and the S.T.A.R. device also worked synergistically to decrease skin-closing tension.

Animals↗
PubMed1993

Microcystic adnexal carcinoma: in vitro growth characteristics and effect on stromal collagen production.

BACKGROUND: Microcystic adnexal carcinoma (MAC) is a locally aggressive cutaneous neoplasm, which is characterized by follicular and sweat gland differentiation and a stroma of dense collagen. METHODS: MAC cells were studied and characterized in vitro through phase microscopy and proliferation assays. Additionally, to delineate a possible role of soluble mediators in bringing about the dense stromal collagen seen in association with these tumors, the effect of conditioned media derived from the tumor cells on the level of collagen production by normal fibroblasts was examined. RESULTS: A significant morphologic difference between the MAC cells and normal keratinocytes was not noted. Proliferation assays demonstrated a significantly slower rate of growth of the MAC cells in comparison to controls. Media conditioned by MAC cells did not induce an increase in collagen synthesis by cultured fibroblasts, but rather, there appeared to be an inhibitory effect on the level of collagen synthesis. CONCLUSIONS: The increased stromal collagen seen in MAC histologically is not the result of growth factors or cytokines produced by the MAC cells.

Carcinoma↗
PubMed1993

Recurrent malignant melanoma following a 35-year disease-free interval.

A case is presented of recurrent melanoma following a 35-year disease-free interval after treatment for stage I disease. Although the case seems to indicate a recurrence of melanoma, the possibility that the "recurrent lesions" may have been a new primary lesion should be considered. Regardless of disease-free interval following initial treatment, a complete cure of the disease can never be assumed.

Aged↗
PubMed1992

Malignant melanoma of the eyelid. A report of eight cases and a review of the literature.

BACKGROUND: Because of the relatively rare occurrence of malignant melanoma (MM) of the eyelid, prognostic factors in relation to survival in these patients have not been established. OBJECTIVE: Our purpose was to examine prognostic indicators in relation to survival in patients with MM of the eyelid. METHODS: All patients seen at UCLA Medical Center with MM of the eyelid as well as all cases reported in the literature were reviewed retrospectively. RESULTS: The data obtained from 47 total cases seen at UCLA Medical Center revealed a significant disadvantage in 5-year survival for those patients with MM involving the lid margins in comparison to those without lid margin involvement. CONCLUSION: Our review suggests that melanoma involving the eyelid margin and conjunctiva has a worse prognosis than melanomas of the eyelid that do not involve the conjunctiva. We can make no predictions in regard to the benefits of narrow versus wide surgical margins in the treatment of these patients.

Adult↗
PubMed1992

Lack of predictive factors in late recurrence of stage I melanoma.

Through the UCLA tumor registry, patients treated for late-relapse malignant melanoma (after a 10-year disease-free interval) were identified and studied retrospectively. The patients were studied in regards to age, sex, primary site of the lesion, the disease-free interval, elective lymph node dissection, mode of recurrence and survival time following relapse. The histologic characteristics studied included the maximal tumor thickness, Clark's levels, rate of mitoses, and presence of ulceration. Based on the 0.84% incidence of late-relapse, the recommendation for annual life-time follow-up examinations for all patients with malignant melanoma is supported.

Adult↗
PubMed1992

Efficacy of double gloving as a protection against blood exposure in dermatologic surgery.

Double gloving has been widely suggested as a means of decreasing exposure to blood and other body fluids. However, most dermatologists do not routinely follow this practice when performing surgical procedures because it reduces manual dexterity and increases costs. To determine whether double gloving should be routinely practiced in dermatologic surgery, pairs of sterile surgical gloves worn during weekly UCLA dermatologic surgery clinics were collected over a period of 3 months and examined for perforations. The procedures gloves were used for ranged from excision of benign lesions, lasting 15 minutes, to hair transplants, lasting 3 hours. Upon completion of the procedures, 8 (5.5%) of 144 pairs of single gloves, 2 (3.7%) of 54 pairs of double inner gloves, and 3 (5.5%) of 54 pairs of double outer gloves were found to have perforations. There were no instances of both the double outer and the double inner gloves having perforations when worn on the same hand. This suggests that double gloving offers a protective advantage by providing extra protection for both the surgeon and the patient during dermatologic surgery.

Blood↗