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Biomedical subjects

P J Perkins

Publications and source records attributed to P J Perkins.

13 recordsLinked to original sources

Follow-up in stage I cutaneous malignant melanoma: an audit.

In Southampton, follow-up of patients with malignant melanoma is carried out in a single dedicated clinic. An audit has been performed to assess its objective value in diagnosing and treating tumour relapse and its subjective value as perceived by patients. Over a 10-year period, of 331 patients with Stage I disease 65 (20%) have developed tumour recurrence. Fifty-five first relapses were either local or in regional lymph nodes, and thus potentially curable; half were found within 3 months of the previous clinic visit. Seventy-two per cent of local and 47% of nodal recurrences were either symptomatic or detected initially by the patient. Whilst doctor-diagnosed nodal recurrences tended to be smaller and to involve fewer histologically positive nodes, subsequent survival was identical in those with patient-diagnosed nodal recurrences. The clinic makes inefficient use of medical time. Questionnaire responses indicate that 54% of patients suffer anxiety prior to clinic visits. Nevertheless follow-up was considered worthwhile by 95% of patients and regular visits were preferred to a 'walk in when necessary' system. The clinic appears to have an important educational role. A series of changes to current follow-up practice are proposed including: more frequent visits for high risk patients, changes in clinic personnel, and greater emphasis on patient education and self examination.

Adolescent

Psychosocial support and malignant melanoma.

The holistic care of patients with malignant melanoma requires psychosocial intervention. This paper provides an argument in support of this, based on research findings, clinical experience, demand and implications for the future. Strategies for providing psychosocial support are outlined with emphasis on a coordinated multidisciplinary approach, specialist nursing contributions and self-help. Recent innovations are described with recommendations for similar strategies to be employed in the prevention of disease and associated morbidity.

Hotlines

Successful 2-week treatment with terbinafine (Lamisil) for moccasin tinea pedis and tinea manuum.

A new orally active antifungal agent, terbinafine, was used in the treatment of tinea pedis ('dry type' or moccasin type) and tinea manuum. Fifty-three adults over the age of 16 years with fungal infections of the feet and/or hands were treated with either oral terbinafine, 250 mg, or placebo, once daily for 2 weeks. The diagnosis of fungal infection was confirmed by examination of skin scrapings by microscopy and culture. Of these, 28 patients were evaluable for efficacy. At 8 weeks, 12 out of 14 (86%) patients who received terbinafine were mycologically negative (microscopy and culture) compared to one out of 14 (7%) patients on placebo (P less than 0.001, Fishers exact test, one-sided). At the end of the study 71% of patients in the terbinafine group were judged to have received effective therapy compared to 0% in the placebo group (P less than 0.001). Terbinafine was well tolerated, and more side-effects were seen in the placebo group.

Adult

The effect of supplementation with selenium and vitamin E in psoriasis.

Since reduced concentrations of selenium in whole blood, plasma and white cells had previously been observed in psoriasis, 69 patients were supplemented daily with either 600 micrograms of selenium-enriched yeast, 600 micrograms of selenium-enriched yeast plus 600 IU of vitamin E or a placebo for 12 weeks. Before supplementation, the patients' mean concentrations of selenium in whole blood and plasma were reduced compared with those of matched healthy controls but their red cell glutathione peroxidase (GSH-Px) activity was normal. After 12 weeks supplementation the patients' mean whole blood, plasma and platelet selenium concentrations, platelet GSH-Px activity and plasma vitamin E concentration had risen significantly from the baseline values but their mean skin selenium concentration and red cell GSH-Px activity remained unchanged. The mean white cell selenium concentration rose only in the group receiving selenium alone. Neither supplementation regimen reduced the severity of psoriasis or produced side-effects. The increase in platelet GSH-Px activity suggests that the supplements were bioavailable and that the patients' selenium status may have been reduced prior to supplementation. The failure of the selenium content of the skin to increase may explain why the patients' psoriasis remained unchanged during supplementation.

Adult

The effect on atopic dermatitis of supplementation with selenium and vitamin E.

Reduced concentrations of selenium in whole blood, plasma and white cells and reduced activity of selenium-dependent glutathione peroxidase in red cells have been found in atopic dermatitis. To determine the effect of selenium supplementation on this disease, the normal daily diet of 60 adults with atopic dermatitis was supplemented with selenium-enriched yeast for 12 weeks in a randomised double-blind study. Group 1 took 600 micrograms of selenium alone, Group 2 600 micrograms of selenium plus 600 IU of vitamin E and Group 3 a placebo. After 12 weeks, there was a significant increase in the concentration of selenium in whole blood and the activity of selenium dependent glutathione peroxidase in platelets in Groups 1 and 2 and the concentration of vitamin E in plasma in Group 2. There was no significant difference between the three Groups in the severity of the eczema or the concentration of selenium either before or after the 12 weeks of supplementation. The results suggest that although selenium-enriched yeast supplement was absorbed and bioavailable it does not enter the skin or produces a worthwhile improvement in atopic dermatitis.

Adult

The pharmacokinetics of selenium in psoriasis and atopic dermatitis.

The pharmacokinetics of [75Se-L]-selenomethionine was studied in 10 patients with psoriasis, 10 with atopic dermatitis and 10 healthy subjects. Values for the gut absorption and the rate of endogenous excretion of [75Se-L]-selenomethionine, the exchangeable total-body selenium and plasma selenium concentration showed no significant differences between either patient group and the controls. The results suggest that there is no gross abnormality of selenium pharmacokinetics in either disease, and fail to explain why previous studies have found reduced selenium concentrations and selenium-dependent glutathione peroxidase activity in psoriasis and atopic dermatitis.

Adult

Balloon occlusion of the renal artery using contrast material instead of air.

Occlusion of the ipsilateral renal artery prior to nephrectomy is facilitated by substituting contrast material for air in the balloon of the Swan-Ganz catheter. The higher specific gravity of the contrast medium causes the balloon to settle in the bloodstream instead of floating in it, permitting it to be carried rapidly into the renal artery.

Catheterization

Liver size determination in pediatrics using sonographic and scintigraphic techniques.

Knowledge of the normal liver size is essential for making the scintigraphic estimate of hepatomegaly. A nomogram for sonographic liver size versus height of the patient was developed for the normal pediatric patient. Liver size was measured as the longitudinal liver length in the plane midway between the xiphoid and the right lateral liver margin. Scintigraphic and sonographic measurements showed a good correlation. The scintigraphic nomogram was developed using the experimentally determined relationship between the two modalities.

Adolescent