REI Flashcards
What is congenital adrenal hyperplasia?
most common cause of ambiguous genitalia. also causes hirsutism.
46 XX, clitoral enlargement, labial fusion, urogenital sinus.
-AR inheritance. 2/2 21 hydroxyls deficiency. obstructs cortisol production and no negative feedback to switch off ACTH. excessive precursor “sidetracks” in direction of androgen production.
-mild to severe disease.
ddx: high 17-OHP.
In new borns, causes shock 2/2 insufficient cortisol. salt-wasting in severe forms 2/2 inadequate aldosterone.
What is puberty?
2 main events:
- gonadarche: FSH/LH activate ovaries
- adrenarche: incr androgen production by adrenal cortex.
What are the stages of puberty in chronological order?
Growth spurt
thelarche - breasts
Pubarche: pubic hair
Adrenarche: onset of androgen dependent changes - axillary and pubic hair growth, body odor, acne
Menarche: Tanner IV or 2-3 years after thelarche.
- normal cycle takes 2-3 yrs to become regular after menarche but can take up to 6.
What are situations to evaluate amenorrhea?
No menses within 3 years of thelarche
No secondary sex development by age 13
Age 14 w/ hx eating disorder
age 14 w/ hirsutism
Age 15 regardless of development
>90 days without menses in menstruating adolescent.
Precocious puberty: occurs 2.5 standard deviations earlier than mean age. age 7 in whites and age 6 in blacks.
Delayed puberty: no breasts by age 12-13
What is life cycle of hair follicle?
ACT!
Anagen - active phase of hair growth
Catagen - involution of epithelial cells surrounding dermal papilla
Telogen - resting phase (hairs fall out with initiation of anlagen)
What is differential diagnosis of hirsutism and what is workup?
familial, PCOS, CAH,
Tumor (ovary or adrenal)
drugs (androgens, danazol)
Hypothyroid, elevated prolactin
Cushings
Workup:
- total testosterone (r/o ovarian/adrenal issues)
- DHEAS (r/o abnormal adrenal function)
- 17-OHP (r/o CAH)
What is treatment of hirsutism?
- OCP (decr androgen and incr SHBG so less free androgen)
- spironolactone (blocks androgen receptor and inhibits 5-alpha reductase)
- Finasteride (5-alpha reductase inhibitor inhibits conversion of testosterone to DHT)
- Flutamine (competitively androgen R antagonist -blocks androgen receptor)
- Vaniqua/eflornithine - blocks ornithine decarboxylase
- laser hair removal
-weight loss : increases SHBG
What is primary amenorrhea?
No menses by age 13 w/o secondary sex characteristics
- No menses by 15 WITH secondary sex
- no menses before age 15 w/ secondary sex + cyclic pelvic pain (r/o outflow tract obstruction)
Causes are divided into :
1. presence or absence of breast development (marker of estrogen/ovarian function)
2. presence/absence of uterus
3. FSH level (POI)
- pregnancy, PCOS, thyroid or prolactin issue, stress-induced, non-congenital CAH
Causes of primary amenorrhea w/ uterus present
- Breast present (estrogen present)
- hypothalamic
-pituitary (prolactinoma)
- ovarian causes
- uterine causes/outflow tract obstruction - Breast absent (estrogen absent)
- Gonadal failure (hypergonadotrophic hypogonadism): Turner’s, mosacisim (X/XX), pure XX/XY gonadal dysgenesis (usually tall), 17-alpha hydroxylate deficiency (rare)
- CNS-hypothalamic-pituitary (hypogonadotrophic hypogonadism): CNS lesions (pituitary adenoma), Kallman’s (hypothalamic failure 2/2 inadequate GnRH), isolated gonadotrophin deficiency, constitutional delay
Causes of primary amenorrhea w/ uterus absent
+breasts:
- vaginal agenesis (Rokitansky-Hauser syndrome): nl pubic hair
- androgen insensitivity (XY): remove gonads after puberty, short/absent vagina, sparse pubic hair.
- breasts:
- XY, agondaism, 17 alpha hydroxylate deficiency
What is the workup of primary amenorrhea?
physical exam: absence of breasts/uterus, hirsutism
HCG
FSH
TSH
PRL
E2/FT4
Pelvic US
MRI in complex cases
What is secondary amenorrhea and causes?
no menses for >3 months in females w/ normal menstrual cycles or >6 months if irregular cycles
- pregnancy!
- Thyroid (hypo OR hyper)
- hyperprolactinemia (lactation, prolactinoma, meds)
- PCOS
-CAH - Stress/exercise
- weight loss/anorexia
- meds (psychotropics)
- POI + fragile X premutation
- androgen secreting tumors
ACTH/GH secreting tumors
hypothalamic lesions: cranioipharyhgioma/TB - Sherman’s syndrome
What is workup of amenorrhea?
- r/o pregnancy
- History: stress/nutrition/weight/meds/sx of hypo estrogen. If galactorrhea: TSH/PRL
- Exam: mullerian structures present?
– short/blind ending vagina: Mullerian agenesis (Mayer Rokitansky), androgen insensitivity (Total testosterone and karyotype), vaginal agenesis/transverse vaginal septum. Cervical atresia (pain/hematometra)
– Normal vagina + cervix:
- TSH/prolactin
- FSH/estradiol
- progesterone withdrawal challenge: 10mg provera (medroxyprogesterone acetate) for 10d:
– if +bleed and nl labs=anovulation (have endogenous estrogen and no outflow tract obstruction)
– If no bleed and nl labs: low estrogen or outflow tract issue (adhesions or scarring)—> E+P challenge.
- E+P challenge: estrogen x 14d then estrogen + progesterone x 10d. If bleeds, not making adequate estrogen. If no bleed, abnormal outflow (Asherman’s, anomaly).
What are FSH/LH/estradiol levels?
FSH: nl 5-30.
LH: nl 5-20.
Estradiol: low is <50
What is workup of primary ovarian insufficiency?
POI: depletion of ovarian follicles w/ cessation of menses before age 40.
2 random tests 1 month apart (CANNOT DO IF ON OCPs):
- elevated FSH/LH and E2 <50 | Typical FSH 30-40, E2<50
- neg pregnancy test
- nl PRL, TSH
If age <30, get karyotype
- 50% is 45 XO=Turner’s
- 25% = 46 XX=Gonadal dysgenesis/agenesis
-25%= 46 XX/XY=Y mosaics (need gonadectomy 2/2 incr cancer risk w/ Y chromosome. eg. gonadoblastoma, dysgermimoma, choriocarcinoma)
If age 30+:
- autoimmune (thyroid, RA, SLE, myasthenias)
- fragile X premutation
- galactosemia
- 17-hydroxylase deficiency (absent secondary sex characteristics)
- perimenopause: incr FSH, nl LH. rpt assays
What is workup of normal FSH/LH assays in amenorrhea?
Workup of low FSH/LH assays?
presentation same as pituitary/hypothalamic failure.
For low: suspect pituitary/hypothalamic issue
- MRI pituitary positive: manage tumor/empty sella syndrome
- MRI normal: hypothalamic amenorrhea (suppression of GnRH pulsatile secretion)- stress/weight/exercise/psychiatric/kallaman syndrome.
What is primary ovarian insufficiency?
What are causes and workup?
cessation of menses by age 40
- Chromosomal (gonadal dysgenesis +/- Turner’s)
- damage from chemo/radiation
- Endocrinopathies: hypoPTH, hypoadrenalism
- Autoimmune
prior pelvic surgery
If confirmed ddx:
- karyotype, FMR1 permutation, adrenal antibodies (if pos, yearly corticotrophin stem test due to risk of adrenal insufficiency), pelvic US, TSH/TPO Ab (20% develop Hashimoto’s)