SciCombinator

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Concept: Terbinafine

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Abstract This is a randomized, double-blind study enrolling 70 patients with onychomycosis of the finger and toenails. Clinical and mycological efficacies as well as measures of safety were assessed monthly for a maximum of 6 months of treatment. The treatment regimens were: fluconazole 1% and fluconazole 1% with urea 40%. These results indicated topical treatment of onychomycosis with a combination of fluconazole 1% and urea 40% was more effective (82.8%) than fluconazole 1% (62.8%) nail lacquer alone in treatment of dermatophytic onychomycosis. Fluconazole was well tolerated and side effects were negligible. At the end of therapy and the end of the 6-month follow-up, fluconazole 1% and urea 40% demonstrated statistically significant superiority in clinical and mycological responses compared with fluconazole 1% alone.

Concepts: Medicine, Effectiveness, Finger, Onychomycosis, Nail, Nail disease, Terbinafine, Itraconazole

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In the framework of a survey on dermatophytoses, 14,619 clinical specimens taken from outpatients with symptoms suggestive of tinea and referred to a Medical Mycology laboratory in Tehran, Iran, were analyzed by direct microscopy and culture. In total, 777 dermatophyte strains recovered in culture were randomly identified by a formerly established RFLP analysis method based on the rDNA ITS regions. For confirmation of species identification, 160 isolates representing the likely entire species spectrum were subjected to ITS-sequencing. Infection was confirmed in 5,175 collected samples (35.4%) by direct microscopy and/or culture. Tinea pedis was the most prevalent type of infection (43.4%), followed by tinea unguium (21.3%), tinea cruris (20.7%), tinea corporis (9.4%), tinea manuum (4.2%), tinea capitis (0.8%) and tinea faciei (0.2%). Trichophyton interdigitale was the most common isolate (40.5%) followed by T. rubrum (34.75%), Epidermophyton floccosum (15.6%), Microsporum canis (3.9%), T. tonsurans (3.5 %) and M. gypseum (0.5%). Other species included M. ferrugineum, T. erinacei, T. violaceum, T. schoenleinii, and a very rare species T. eriotrephon (each one 0.25%). The two strains of T. eriotrephon isolated from tinea manuum and tinea faciei are the second and third reported cases worldwide. Application of DNA-based methods is an important aid in monitoring trends in dermatophytosis in the community.

Concepts: Biology, Trichophyton rubrum, Onychomycosis, Dermatophyte, Fungal diseases, Terbinafine, Mycosis-related cutaneous conditions, Dermatophytosis

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Trichophyton rubrum var. raubitschekii is a rare anthropophilic dermatophyte isolated around the world from tinea corporis, tinea cruris, tinea pedis and tinea unguium. In this study, the isolation rate of T. rubrum var. raubitschekii was studied in 200 cases of tinea pedis and tinea unguium in Japan. The 200 clinical isolates were shown to be of downy type as their colonies on Sabouraud’s dextrose agar were white to cream, suede-like to downy, with a yellow-brown to wine-red reverse, and they produced few macroconidia. The type strain of T. rubrum var. raubitschekii (CBS 100084) and one clinical isolate (KMU 8337; isolated at Kanazawa) of downy type tested positive for urease, but the reference strain of T. rubrum (CBS 392.58) and the remaining 199 clinical isolates tested negative. Further epidemiological investigations are required to study human cases of infection with the granular type of T. rubrum and T. rubrum var. raubitschekii in Japan.

Concepts: Biology, Trichophyton rubrum, Onychomycosis, Athlete's foot, Dermatophyte, Fungal diseases, Terbinafine, Mycosis-related cutaneous conditions

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Superficial fungal infections due to dermatophytes are common over the world and their frequency is constantly increasing. The aim of our study was to discuss fungal infections with frequency of occurrence, clinical stages and aetiology in patients admitted to dermatological ward and microbiological laboratory of the specialist hospital in Krakow. Investigations performed between 1995 and 2010 included the group of 5333 individuals. Dermatophyte infections, confirmed by culture, were revealed in 1007 subjects (18.9%), i.e. in 553 males and 454 females. The most frequent clinical forms of infections were tinea unguium and tinea pedis, caused mainly by Trichophyton rubrum and by Trichophyton mentagrophytes. Tinea corporis, tinea manuum, tinea capitis and tinea cruris constituted a small percentage of infections and the main aetiological factors of these dermatomycoses were also T. rubrum and T. mentagrophytes. Between 1995 and 2000 there were stated small differences in the number of isolated strains of dermatophytes in comparison with the number of examined patients. Since 2006 there has been observed a decrease in number of patients in our hospital with suspected fungal infections, but per cent of positive cultures has remained unchanged in comparison with earlier period.

Concepts: Trichophyton rubrum, Onychomycosis, Athlete's foot, Dermatophyte, Fungal diseases, Terbinafine, Mycosis-related cutaneous conditions, Dermatophytosis

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Tinea infections are caused by dermatophytes and are classified by the involved site. The most common infections in prepubertal children are tinea corporis and tinea capitis, whereas adolescents and adults are more likely to develop tinea cruris, tinea pedis, and tinea unguium (onychomycosis). The clinical diagnosis can be unreliable because tinea infections have many mimics, which can manifest identical lesions. For example, tinea corporis can be confused with eczema, tinea capitis can be confused with alopecia areata, and onychomycosis can be confused with dystrophic toenails from repeated low-level trauma. Physicians should confirm suspected onychomycosis and tinea capitis with a potassium hydroxide preparation or culture. Tinea corporis, tinea cruris, and tinea pedis generally respond to inexpensive topical agents such as terbinafine cream or butenafine cream, but oral antifungal agents may be indicated for extensive disease, failed topical treatment, immunocompromised patients, or severe moccasin-type tinea pedis. Oral terbinafine is first-line therapy for tinea capitis and onychomycosis because of its tolerability, high cure rate, and low cost. However, kerion should be treated with griseofulvin unless Trichophyton has been documented as the pathogen. Failure to treat kerion promptly can lead to scarring and permanent hair loss.

Concepts: Antifungal drug, Onychomycosis, Athlete's foot, Fungal diseases, Griseofulvin, Terbinafine, Mycosis-related cutaneous conditions, Dermatophytosis

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Recurrence (relapse or re-infection) in onychomycosis is common, occurring in 10% to 53% of patients. However, data on prevalence is limited as few clinical studies follow patients beyond 12 months. It has been suggested that recurrence after continuous terbinafine treatment may be less common than with intermittent or continuous itraconazole therapy, probably due to the fungicidal activity of terbinafine, although these differences tended not to be significant. Relapse rates also increase with time, peaking at month 36. Although a number of factors have been suggested to play a role in recurrence, only the co-existence of diabetes has been shown to have a significant impact. Data with topical therapy is sparse; a small study showed amorolfine prophylaxis may delay recurrence. High concentrations of efinaconazole have been reported in the nail two weeks' post-treatment suggesting twice monthly prophylaxis with topical treatments may be a realistic option, and may be an important consideration in diabetic patients with onychomycosis. Data suggest that prophylaxis may need to be continued for up to three years for optimal effect. Treating tinea pedis and any immediate family members is also critical. Other preventative strategies include avoiding communal areas where infection can spread (such as swimming pools), and decontaminating footwear.

J Drugs Dermatol. 2016;15(3):279-282.

Concepts: Family, Clinical trial, Suggestion, Social psychology, Antifungal drug, Onychomycosis, Athlete's foot, Terbinafine

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Microsporum gypseum complex is a group of geophillic dermatophytes with a worldwide distribution and is a rare cause of dermatomycoses in humans. The infection most commonly presents as tinea corporis, with some geographical and occupational variations. We studied M. gypseum complex infections in patients examined in the Mycological Laboratory of the Department of Dermatovenereology, University Medical Centre Ljubljana, during the period 2000-2015. Diagnosis was confirmed by mycological examination. Skin scales were examined by direct microscopy and cultivated on Sabouraud glucose agar. A total of 226 patients were identified, representing 1.5% of all dermatophyte infections during the study period. Tinea corporis was diagnosed in majority of patients, followed by tinea manus, tinea faciei, tinea inguinalis and tinea pedis. Tinea capitis was observed in three and onychomycosis in two patients only. Infection was disseminated on different parts of the body in nine patients. In 39% of patients, infection was diagnosed in children younger than 9 years. Face and scalp infection was more often observed in children. The incidence was the highest during July and October. Contacts with soil and domestic animals were often reported. Data on the prevalence and clinical characteristics of M. gypseum complex infection in other countries are reviewed.

Concepts: Disease, Onychomycosis, Dermatophyte, Tinea, Fungal diseases, Terbinafine, Mycosis-related cutaneous conditions, Tinea corporis

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The present investigation focused on developing, optimizing, and evaluating a novel liposome-loaded nail lacquer formulation for increasing the transungual permeation flux of terbinafine HCl for efficient treatment of onychomycosis. A three-factor, three-level, Box-Behnken design was employed for optimizing process and formulation parameters of liposomal formulation. Liposomes were formulated by thin film hydration technique followed by sonication. Drug to lipid ratio, sonication amplitude, and sonication time were screened as independent variables while particle size, PDI, entrapment efficiency, and zeta potential were selected as quality attributes for liposomal formulation. Multiple regression analysis was employed to construct a second-order quadratic polynomial equation and contour plots. Design space (overlay plot) was generated to optimize a liposomal system, with software-suggested levels of independent variables that could be transformed to desired responses. The optimized liposome formulation was characterized and dispersed in nail lacquer which was further evaluated for different parameters. Results depicted that the optimized terbinafine HCl-loaded liposome formulation exhibited particle size of 182 nm, PDI of 0.175, zeta potential of -26.8 mV, and entrapment efficiency of 80%. Transungual permeability flux of terbinafine HCl through liposome-dispersed nail lacquer formulation was observed to be significantly higher in comparison to nail lacquer with a permeation enhancer. The developed formulation was also observed to be as efficient as pure drug dispersion in its antifungal activity. Thus, it was concluded that the developed formulation can serve as an efficient tool for enhancing the permeability of terbinafine HCl across human nail plate thereby improving its therapeutic efficiency.

Concepts: Regression analysis, Onychomycosis, Liposome, Terbinafine

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Although systemic and topical antifungal agents are widely used to treat onychomycosis, oral medications can cause adverse effects and the efficacy of topical agents is not satisfying. Currently, laser treatment has been studied for its efficacy in the treatment of onychomycosis. Our study was aimed to evaluate the efficacy of fractional carbon dioxide (CO2) laser treatment combined with terbinafine cream for 6 months in the treatment of onychomycosis and to analyze the influencing factors.

Concepts: Oxygen, Carbon dioxide, Antifungals, Infrared, Onychomycosis, Athlete's foot, Terbinafine, Ringworm

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Onychomycosis is a fungal nail infection. The development of new topical antifungal agents for the treatment of onychomycosis has focused on formulation enhancements that optimize the pharmacological characteristics required for its effective treatment. Polyurethanes (PUs) have never been used in therapeutic nail lacquers. The aim of this work has been the development of new PU based nail lacquers with antifungal activity containing 1.0% (w/w) of terbinafine hydrochloride. The biocompatibility, wettability and the prediction of the free volume in the polymeric matrix were assessed using a human keratinocytes cell line, contact angle and Positron Annihilation Lifetime Spectroscopy (PALS) determinations, respectively. The morphology of the films obtained was confirmed by Scanning Electron Microscopy (SEM), while the nail lacquers' bioadhesion to nails was determined by mechanical tests. Viscosity, in vitro release profiles and antifungal activity were also assessed. This study demonstrated that PU-terbinafine based nail lacquers have good keratinocyte compatibility, good wettability properties and adequate free volume. They formed a homogenous film after application, with suitable adhesion to the nail plate. Furthermore, the antifungal test results demonstrated that the terbinafine released from the nail lacquer Formulation A PU 19 showed activity against dermatophytes namely, Tricophyton rubrum.

Concepts: Electron, Wetting, Scanning electron microscope, Antifungals, Onychomycosis, Athlete's foot, Terbinafine, Ringworm