Krankheiten der Nägel

Haneke, Eckart

doi:10.1007/s00105-013-2572-7

Hautarzt

2013

DOI: 10.1007/s00105-013-2572-7

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Krankheiten der Nägel

Eckart Haneke

Abstract: Nail alterations are frequently seen in daily practice, but they are often difficult to interpret. Basic knowledge of the anatomy and biology of the nail facilitates their diagnosis as this frequently allows their development and morphology to be explained. The following short review gives hints at the most important infections, inflammatory nail diseases and tumors.

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Cited by 4 publications

References 30 publications

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Anatomie, Biologie, Physiologie und Grundzüge der Pathologie des Nagelorgans

Haneke

2014

Hautarzt

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The nail is the largest skin appendage. It grows continuously through life in a non-cyclical manner; its growth is not hormone-dependent. The nail of the middle finger of the dominant hand grows fastest with approximately 0.1 mm/day, whereas the big toe nail grows only 0.03-0.05 mm/d. The nails' size and shape vary characteristically from finger to finger and from toe to toe, for which the size and shape of the bone of the terminal phalanx is responsible. The nail apparatus consists of both epithelial and connective tissue components. The matrix epithelium is responsible for the production of the nail plate whereas the nail bed epithelium mediates firm attachment. The hyponychium is a specialized structure sealing the subungual space and allowing the nail plate to physiologically detach from the nail bed. The proximal nail fold covers most of the matrix. Its free end forms the cuticle which seals the nail pocket or cul-de-sac. The dermis of the matrix and nail bed is specialized with a morphogenetic potency. The proximal and lateral nail folds form a frame on three sides giving the nail stability and allowing it to grow out. The nail protects the distal phalanx, is an extremely versatile tool for defense and dexterity and increases the sensitivity of the tip of the finger. Nail apparatus, finger tip, tendons and ligaments of the distal interphalangeal joint form a functional unit and cannot be seen independently. The nail organ has only a certain number of reaction patterns that differ in many respects from hairy and palmoplantar skin.

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Anatomie, Biologie, Physiologie und Grundzüge der Pathologie des Nagelorgans

Haneke

2014

Hautarzt

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Infektionen an Finger- und Zehennägeln durch Pilze und Bakterien

Nenoff¹,

Paasch

Handrïck³

2014

Hautarzt

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Infections of the finger and the toe nails are most frequently caused by fungi, primarily dermatophytes. Causative agents of tinea unguium are mostly anthropophilic dermatophytes. Both in Germany, and worldwide, Trichophyton rubrum represents the main important causative agent of onychomycoses. Yeasts are isolated from fungal nail infections, both paronychia and onychomycosis far more often than generally expected. This can represent either saprophytic colonization as well as acute or chronic infection of the nail organ. The main yeasts causing nail infections are Candida parapsilosis, and Candida guilliermondii; Candida albicans is only in third place. Onychomycosis due to molds, or so called non-dermatophyte molds (NDM), are being increasingly detected. Molds as cause of an onychomycosis are considered as emerging pathogens. Fusarium species are the most common cause of NDM onychomycosis; however, rare molds like Onychocola canadensis may be found. Bacterial infections of the nails are caused by gram negative bacteria, usually Pseudomonas aeruginosa (recognizable because of green or black coloration of the nails) but also Klebsiella spp. and gram positive bacteria like Staphylococcus aureus. Treatment of onychomycosis includes application of topical antifungal agents (amorolfine, ciclopirox). If more than 50 % of the nail plate is affected or if more than three out of ten nails are affected by the fungal infection, oral treatment using terbinafine (in case of dermatophyte infection), fluconazole (for yeast infections), or alternatively itraconazole are recommended. Bacterial infections are treated topically with antiseptic agents (octenidine), and in some cases with topical antibiotics (nadifloxacin, gentamicin). Pseudomonas infections of the nail organ are treated by ciprofloxacin; other bacteria are treated according to the results of culture and sensitivity testing.

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Was brennt Ihren Patienten unter den Nägeln?

Borelli

Lautenschlager

2018

ästhet dermatol kosmetol

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Krankheiten der Nägel

Cited by 4 publications

References 30 publications

Anatomie, Biologie, Physiologie und Grundzüge der Pathologie des Nagelorgans

Anatomie, Biologie, Physiologie und Grundzüge der Pathologie des Nagelorgans

Infektionen an Finger- und Zehennägeln durch Pilze und Bakterien

Was brennt Ihren Patienten unter den Nägeln?

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