Telogen effluvium
| Telogen effluvium | |
|---|---|
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| An Afghan child displaying hair loss due to severe malnutrition | |
| Specialty | Dermatology  |
Telogen effluvium is a scalp disorder characterized by the thinning or shedding of hair resulting from the early entry of hair in the telogen phase (the resting phase of the hair follicle).[1][2] It is in this phase that telogen hairs begin to shed at an increased rate, where normally the approximate rate of hair loss (having no effect on one's appearance) is 125 hairs per day.[3]
There are 5 potential alterations in the hair cycle that could lead to this shedding: immediate anagen release, delayed anagen release, short anagen syndrome, immediate telogen release, and delayed telogen release.[3][4]
- Immediate anagen release occurs when follicles leave anagen and are stimulated to enter telogen prematurely. The effects become visible 2–3 months later with increased telogen effluvium.
- Delayed anagen release, most commonly associated with pregnancy, involves the prolongation of anagen under the effect of pregnancy hormones, resulting in delayed but synchronous and heavy postpartum hair shedding.
- Short anagen syndrome is characterized by an idiopathic and persistent telogen hair shedding, as well as the inability to grow hair long. This is a result of the shortening of the duration of anagen, meaning a greater number of telogen hairs at any given time, and is responsible for the majority of chronic TE cases.
- Immediate telogen release generally occurs with drug-induced shortening of telogen leading to the premature reentrance of follicles to anagen, which causes a massive release of club (telogen) hairs. Drugs such as minoxidil can precipitate immediate telogen release.
- Delayed telogen release involves a prolonged telogen phase followed by a delayed transition to anagen. This occurs in animals with synchronous hair cycles that shed their hair or winter coats seasonally. This is also sometimes responsible for seasonal hair loss in humans.[3][4][5]
Emotional or physiological stress may result in an alteration of the normal
Diagnostic tests, which may be performed to verify the diagnosis, include a trichogram, trichoscopy[7] and biopsy.[6] Effluvium can present with similar appearance to alopecia totalis, with further distinction by clinical course, microscopic examination of plucked follicles, or biopsy of the scalp.[8] Histology would show telogen hair follicles in the dermis with minimal inflammation in effluvium, and dense peribulbar lymphocytic infiltrate in alopecia totalis.[9]
Vitamin D levels may also play a role in the normal hair cycle.[10]
Many new cosmetic treatments have been reported, including
See also
- Anagen effluvium
- Noncicatricial alopecia
References
- ^ ISBN 1-4160-3185-5.
- ISBN 0-7216-2921-0.
- ^ ISBN 9783319721347.
- ^ ISSN 2079-9284.
- PMID 23974577.
- ^ ISBN 0-07-138076-0.
- PMID 18664157.
- PMID 23197208.
- PMID 23159179.
- PMID 20178699.)
{{cite journal}}: CS1 maint: multiple names: authors list (link - S2CID 21918537.