Alopecia Nastaran tavakoli Guilan University of Medical sciences
Anatomy of Hair
The life cycle of a hair is divided into three phases.
The actively growing (Anagen)phase
the transitional(Catagen) phase
the resting (Telogen) phase.
Hair Growth Cycle
Hair pull test
Anagen Catagen Telogen
A physiologic reaction
Family history: Commonly positive
Androgenic Alopecia in men (male pattern baldness)
Autotransplantation of hair
Scalp extension and expansion
Androgenic Alopecia in Women (Female pattern hair loss)
Women with androgenetic alopecia do not have higher levels of circulating androgens.
Diffuse central thinning
There is not usually any recession of the frontal hairline.
Associated findings: Signs or symptoms of hyperandrogenism should be looked for, ie, hirsutism,moderate to severe or treatment-refractory acne,irregular menses, infertility, and/or galactorrhea.Acanthosis nigricans is a marker for insulin resistance which is commonly associated with hyperandrogenism
If a woman has irregular menses, abrupt hair loss, hirsutism, or acne recurrence, an endocrine evaluation is appropriate.
In this situation, total testosterone, free testosterone, dehydroepiandrosterone sulfate,and prolactin levels should be obtained.
Check TSH and serum ferritin
iron deficiency (serum ferritin or serum iron and TIBC)
Cyproterone Acetate with Ethinyloestradiol (Diane )
This condition is caused by localized trauma to the hair follicles from tight hairstyles that pull at hair over time.
If the condition is detected early enough, the hair will regrow.
Braiding, cornrows, tight ponytails, and extensions are the most common styling causes.