Pruriplastic Itch-A Novel Pathogenic Concept in Chronic Pruritus

Area of Science:

• Neuroscience
• Dermatology
• Pain Research

Background:

• The International Association for the Study of Pain (IASP) has defined nociceptive, neuropathic, and nociplastic pain.
• Chronic itch conditions often lack clear pathophysiological explanations, complicating diagnosis and treatment.
• Existing classifications may not adequately capture itch arising from altered sensory processing without evident tissue damage.

Purpose of the Study:

• To propose a new descriptor, "pruriplastic pruritus," analogous to nociplastic pain.
• To establish a framework for understanding itch originating from altered nociception.
• To facilitate systematic screening and tailored treatment for chronic itch patients.

Main Methods:

• Clinical and pathophysiological arguments were used to develop the definition.
• The proposed definition encompasses conditions like psychogenic pruritus, pruritus ani, vulvar pruritus, and sensitive skin.
• The concept is based on the IASP's pain classification system.

Main Results:

• A definition for "pruriplastic pruritus" is proposed, characterizing itch due to altered nociception without clear peripheral or central nervous system pathology.
• This classification could include poorly understood chronic itch conditions.
• It offers a systematic approach to evaluating pruritus.

Conclusions:

• The introduction of "pruriplastic pruritus" can standardize the assessment of chronic itch.
• This descriptor may help identify patients who would benefit from centrally acting treatments.
• It provides a novel perspective for understanding and managing complex itch disorders.