Intramatricial injections for nail psoriasis: An open-label comparative study of triamcinolone, methotrexate, and cyclosporine.

BACKGROUND: One of the most effective options available for treating psoriatic fingernails is intramatricial injection of triamcinolone acetonide. Efficacies of intramatricial methotrexate and cyclosporine have not been comparatively evaluated to date. METHODS: Ninety fingernails in 17 patients were assigned to three groups of thirty nails each, and treated with intramatricial injections of triamcinolone acetonide (10 mg/ml), methotrexate (25 mg/ml) and cyclosporine (50 mg/ml) respectively. Each nail was given two injections with a 6-week interval, and graded at 24 weeks using the Nail Psoriasis Severity Index. RESULTS: In both triamcinolone acetonide and methotrexate groups, 15 (50%) nails out of 30 showed >75% improvement. In the cyclosporine group, only ten (33%) nails showed >75% improvement. Side effects were most in the nails treated with cyclosporine. LIMITATIONS: The limited follow-up period of 24 weeks may have been insufficient for detecting delayed remissions. The number of patients was small and there was no randomization or blinding. The lack of a placebo/ no- treatment arm can be considered a limitation. CONCLUSIONS: Amongst the three drugs studied, intramatricial methotrexate injection yielded the most improvement with minimum side effects, results being comparable to intramatricial triamcinolone acetonide injection. Cyclosporine was the least effective drug, with the most side effects. Intramatricial injection therapy is a safe, economical, simple and effective therapeutic modality in the management of nail psoriasis.

Application of Hansen Solubility Parameters to predict drug-nail interactions, which can assist the design of nail medicines.

We hypothesised that Hansen Solubility Parameters (HSPs) can be used to predict drug-nail affinities. Our aims were to: (i) determine the HSPs (δD, δP, δH) of the nail plate, the hoof membrane (a model for the nail plate), and of the drugs terbinafine HCl, amorolfine HCl, ciclopirox olamine and efinaconazole, by measuring their swelling/solubility in organic liquids, (ii) predict nail-drug interactions by comparing drug and nail HSPs, and (iii) evaluate the accuracy of these predictions using literature reports of experimentally-determined affinities of these drugs for keratin, the main constituent of the nail plate and hoof. Many solvents caused no change in the mass of nail plates, a few solvents deswelled the nail, while others swelled the nail to varying extents. Fingernail and toenail HSPs were almost the same, while hoof HSPs were similar, except for a slightly lower δP. High nail-terbinafine HCl, nail-amorolfine HCl and nail-ciclopirox olamine affinities, and low nail-efinaconazole affinities were then predicted, and found to accurately match experimental reports of these drugs' affinities to keratin. We therefore propose that drug and nail Hansen Solubility Parameters may be used to predict drug-nail interactions, and that these results can assist in the design of drugs for the treatment of nail diseases, such as onychomycosis and psoriasis. To our knowledge, this is the first report of the application of HSPs in ungual research.

Trachyonychia: a comprehensive review.

Trachyonychia or rough nails, may present as an idiopathic disorder of the nails or it can be associated with other dermatological conditions. The dystrophic nail findings seen in trachyonychia are characterized by brittle, thin nails, with excessive longitudinal ridging. The most common histopathologic features associated with trachyonychia are spongiosis and exocytosis of inflammatory cells into the nail epithelia; typical features of lichen planus or psoriasis can also be detected. Determining the cause of trachyonychia is challenging. Treatment is often unsatisfactory, although in general it should be aimed at the underlying cause, if found. In most cases, the nail abnormalities improve spontaneously.

Newer trends in the management of psoriasis at difficult to treat locations: scalp, palmoplantar disease and nails.

Psoriasis is a common, chronic, inflammatory disease with a wide range of clinical presentations. The disease severity ranges from mild to severe. Plaque type of psoriasis is the most common. A number of factors like previous treatment history and comorbid conditions influence the treatment of psoriasis in an individual patient. Location of the lesions is also an important consideration. Psoriasis localized to certain areas of the body like scalp, nails, palms and soles remains difficult to treat. These sites have been referred to as the difficult locations in literature. This article covers the management of psoriasis limited to these special areas.