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Biomedical subjects

L M Solomon

Publications and source records attributed to L M Solomon.

90 records · Page 5Linked to original sources
PubMed1967

Radioautography of noradrenaline-14-C in atopic dermatitis.

Since storage-time of administered noradrenaline in the skin of patients with atopic dermatitis may be prolonged, it would be of interest to demonstrate the site of uptake of noradrenaline-(14)C in atopic dermatitis as compared with other eczematous and normal skins. Two adult patients with longstanding atopic dermatitis, a patient with contact dermatitis to nickel and one with normal skin, were studied. Identical sites in the four patients were injected intradermally with 0.02 mug. DL-noradrenaline-7-(14)C acetate. An 8-mm. punch biopsy of the injected site was performed 24 hours later. Radioautographs were developed between three and 199 days, according to the technique of Kopriwa and Leblond.(2) At 199 days, the number of grains in atopic dermatitic skin was greater than in contact dermatitis or normal skin. There was a concentration of grains over arrectores pilorum muscles and the upper one-third of the epidermis of atopic skin. Grains were also visible in proximity to arteriolar walls. There were few grains visible in the control sections. The results confirm earlier studies suggesting that atopic dermatitic skin retains noradrenaline longer than other dermatoses. Noradrenaline concentrates in the arrectores pilorum muscles and the upper epidermis. These findings may explain the cutis anserina (goose-flesh) appearance in atopic dermatitis.

Adult↗
PubMed1966

Atopic dermatitis.

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Dermatitis, Atopic↗
PubMedDate not supplied

Evaluation of transdermal theophylline pharmacokinetics in neonates.

Theophylline may be administered by several routes, but problems are associated with neonatal dosing. The transdermal route may provide a safer and noninvasive method of administration, yet produce therapeutic concentrations in a consistent and reliable manner. To study the feasibility of this in the apnea of prematurity, stable neonates were administered a subtherapeutic transdermal dose for 24 hours in order to assess pharmacokinetics and bioavailability. This was followed with routine intravenous theophylline therapy according to institutional policy. Six of nine neonates had detectable serum theophylline concentrations that increased slowly after patch application. Mean (+/- SD) maximum serum concentration was 2.4 +/- 1.3 micrograms/ml, mean time to maximum serum concentration was 22 +/- 8.2 hours, and mean latency period was 8.0 +/- 4.9 hours. Mean total amount of theophylline delivered to the skin was 18.6 +/- 4.1 mg. Mean fractional absorption at 30 hours was 0.25 +/- 0.12. These data demonstrate that it is possible to produce systemic theophylline concentrations with a transdermal patch in preterm infants sufficient to study pharmacokinetics and bioavailability, and that transdermal delivery of therapeutic doses is technologically feasible.

Administration, Cutaneous↗