Skin blister and skin biopsy to quantify epidermal nerves: a comparative study

Area of Science:

• Neurology
• Dermatology
• Histology

Background:

• Skin biopsy is crucial for diagnosing peripheral neuropathy, with epidermal nerve fiber (ENF) density and morphology indicating nerve involvement.
• The suction skin blister method offers a less invasive approach to visualize and quantify ENFs, providing a comprehensive view of the epidermal surface.

Purpose of the Study:

• To compare the efficacy of the suction skin blister method against the traditional punch skin biopsy for evaluating epidermal nerve fibers (ENFs).

Main Methods:

• Twenty-five healthy volunteers underwent both a 3 mm punch skin biopsy and two 3 mm suction blister specimen collection from the foot and calf.
• Epidermal nerve fiber (ENF) density was compared between blister and biopsy samples using analysis of covariance, controlling for age, gender, and location.

Main Results:

• The suction skin blister roof allowed detailed analysis of ENF density, morphology, and distribution.
• No significant differences in ENF density were observed between the suction skin blister and punch biopsy methods (p = 0.29).
• ENF density was found to decrease with increasing age (p < 0.01).

Conclusions:

• The suction skin blister method is a minimally invasive and reliable technique for investigating small fiber neuropathies.
• It is comparable to skin biopsy for determining epidermal nerve fiber density, showing potential as a diagnostic tool.