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Dermatology - Clinical Medicine IV > Hair Disorders > Flashcards

Flashcards in Hair Disorders Deck (54)
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1

What are the hair disorders?

Alopecia Areta
Androgenetic Alopecia
Hair structure & color defects
Telogen Effluvium
Anagen Effluvium
Pseudofolliculitis barbae & folliculitis

2

What is the hair growth cycle?

Anagen - period of growth – 3 to 6 years
Catagen - period of transition - 2 weeks
Telogen- period of rest - 3 to 4 months

3

What represents 90% of hairs?

anagen

4

What represents 10% of hairs?

catagen and telogen

5

What is alopecia areata?

discrete annular patches of hair loss without scalp disease or scaring

6

What is hair loss of the entire scalp?

alopecia totalis

7

What is hair loss on entire body?

alopecia universalis

8

What do you see on exam of alopecia areata?

broken off hair, exclamation point hairs at periphery of lesions

9

What do you see in nails of pt with alopecia areata?

nail pitting, longitudinal striation
20% pt

10

What associated disorders of alopecia areata?

Vitiligo
Familial multiendocrine syndrome
Thyroid disease
Stress

11

What is the work up for alopecia areata?

Thyroid studies
Serum Iron - Rule out Anemia
ANA - Rule out SLE

12

What is the treatments for alopecia areata?

Topical steroids
Intralesional injection of triamcinolone
tacrolimus (Protopic) and pimecrolimus (Elidel)

13

What does tacolimus and pimecrolimus do?

inhibit t lymphocyte activation
short term use only due to risk of malignancy

14

Is there a cure for alopecia areata?

no, supplement with wigs, make up or psychological support

15

What is androgenetic alopecia?

Progressive balding
Genetic predisposition
Androgen action

16

Who gets androgenetic alopecia?

men > females

17

How does androgenetic alopecia appear in men?

receding anterior hairline, bald spot on posterior crown

18

How does androgenetic alopecia appear in females?

Diffuse loss of hair
Thinning appearance
Endocrine work up if indicated

19

What is the pathology of AGA?

Circulating androgens are converted to dihydrotestosterone (DHT) by 5 alpha reductase (5R)in the hair follicle.
In AGA there is an increase of (5R) therefore an increase of DHT.
DHT causes an increase in the telogen phase and a shortening of the anagen phase

20

What is the first treatment for AGA?

Topical minoxidil (Rogaine) 2% for women, 5% for men
Apply to scalp BID, if no regrowth in 4 months then d/c

21

What is another AGA treatment?

Interferes with conversion of testosterone to 5-alpha=dihydrotestosterone
PO finasteride (Propecia) 1mg PO Qday for men only.
Min 3 months- stop tx sxs return within 12 mos

22

What are the side effects of finasteride?

Teratogenicity (in male fetus)
Erectile dysfunction and infertility

23

Who is finasteride contraindicated in?

women and children

24

What is the most extensive tx for AGA?

hair transplant

25

What is Loss of hair in the Telogen (resting) phase?

Telogen effluvium

26

What is telogen effluvium associated with?

Post partum
Crash dieting
Surgery
Birth Control Pills
High Fever
Drugs - Anticoagulants, Heparin, Lithium, Accutane, Allopurinol, Propanolol, many others

27

What is the treatment for telogen effluvium?

resurrance will grow back

28

What is Loss of hairs in Anagen (growth) Phase?

anagen effluvium

29

What causes anagen effluvium?

Chemotheraputic, Anticancer agents
*Antimetabolite
*Alkylating agents
*Mitotic inhibitors
*Doxorubicin

30

What is the pathology of anagen effluvium?

1-2 weeks of high doses of chemotheraputic agents
Anagen hair shaft abruptly thinned
As this portion reaches the surface all hairs break off simultaneously