OBGYN Clerkship Flashcards
Still birth
1. fetal death > (BLANK) weeks, prior to delivery
2. two of the highest yield test for identifying the cause for still birth are (Blank) and (blank)
- 20
- placental evaluation
- fetal autopsy
Management of intrauterine fetal demise?
1. 20-23 weeks
2. >= 24 weeks
- dilation and evacuation OR vaginal delivery
- vaginal delivery
PCOS
1. androgen excess (e.g. acne, male pattern baldness, hirsutism)
2. oligoovulation or anovulation
3. polycystic ovaries on U/S
Labs
- Testosterone (A)?
- Estrogen (B)?
- LH/FSH (C)?
Treatment? (3 parts)
A. increase
B. increase (peripheral androgen conversion in adipose tissue and decreased level of sex-hormone binding globulin)
C. LH/FSH imbalance
Tx: - weight loss (first line)
- oral contraceptive pills for menstrual regulation
- Letrozole for ovulation induction
How does high levels of estrogen affect hormone axis in patients with PCOS?
(GnRH, LH, FSH, etc)
- Hypothalamus –> causes high frequency, short interval GnRH pulses
- This frequency leads to preferentially produce LH, resulting in imbalance of LH and FSH release from anterior pituitary
- This results in lack of LH surge –> failure of follicle maturation and oocyte release (anovulation)
What is the HPG axis
1. Hypothalamus
2. Anterior pituitary
3. Gonads
- Hypothalamus –> GnRH
- Anterior pituitary –> LH, FSH
- Gonads –> sex hormones (testes - testosterone and ovaries - estradiol and progesterone)
–Sex hormones have negative effect on anterior pituitary and hypothalamus
Prolactin Hormone Axis
1. Hypothalamus
2. Anterior pituitary
3. breasts
- Hypothalamus release dopamine which has negative feedback on prolactin release
- Ant. Pit. –> prolactin
- Galactorrhea from breasts
–> increased prolactin also has negative feedback on hypothalamus to release less GnRH
In adolescents, the immature hypothalamic-pituitary-ovarian axis causes anovulation and can result in heavy, irregular menstrual bleeding.
- In hemodynamically stable patients
- In hemodynamically unstable patients
- what is the best treatment for this
- In hemodynamically stable patients, heavy vaginal bleeding is managed with high-dose oral contraceptive therapy to stabilize the endometrium and stop the acute bleeding.
- In hemodynamically unstable, anemic patients (eg, tachycardia, hypotension), a dilation and curettage and/or a packed red blood cell transfusion may be indicated. A dilation and curettage removes the endometrium to quickly stop bleeding in an acute situation.
-Vulvovaginal dryness, irritation, pruritus
-Dyspareunia
-Vaginal bleeding
-Urinary incontinence, recurrent urinary tract infection
-Pelvic pressure
On pelvic exam
–Narrowed introitus
-Pale mucosa, ↓elasticity, ↓rugae
-Petechiae, fissures
-Loss of labial volume
What is this?
How to treat?
This genitourinary syndrome of menopause
—> (or atrophic vaginitis), the result of a physiologic decline in estrogen production from depleted ovarian follicles. Low estrogen levels cause diminished blood flow and decreased collagen and glycogen production in the vulvovaginal tissues that result in the loss of epithelial elasticity and subsequent atrophy. The atrophic urogenital epithelium becomes thin, dry, and easily denuded, making it more susceptible to injury (eg, trauma, infection). Therefore, even minimal tissue manipulation (eg, wiping with toilet paper) can cause vestibular fissures and vaginal petechiae, leading to vulvar or vaginal bleeding.
Tx
1. Vaginal moisturizer and lubricant
2. Topical vaginal estrogen
—Thin, white, wrinkled skin over the labia majora/minora; atrophic
changes that may extend over the perineum & around the anus
—Excoriations, erosions, fissures from severe vulvar pruritus
—Dysuria, dyspareunia, painful defecation
- What is this
- In what patient population does it usually occur?
- Treatment?
- Vulvar lichen sclerosus - chronic inflammatory condition that causes thinning of the vulvar skin in hypoestrogenic populations. white, atrophic papules form and eventually merge into plaques, leading to thin, white vulvar lesions and changes in vulvar architecture (eg, adherence of the labia at the midline). These lesions are chronically inflamed and can result in perianal and vulvar pruritus, at times so severe that it awakens affected individuals from sleep. Excessive scratching can result in excoriations, lichenification (ie, thickened skin), and edema of the labia. Lichenification of the perianal region can result in anal fissures and constipation
- Prepubertal girls & perimenopausal or postmenopausal women
- Superpotent corticosteroid ointment
- What causes primary dysmenorrhea (physiologic painful menses)?
- What is treatment?
- excessive prostaglandin production
- NSAID drugs (stops prostaglandin production) and combo OCP
Why can epidural anesthesia cause hypotension?
- epidural has sympathetic blockade - this leads to venodilation and blood distribution to lower extremities because of venous pooling
What are risk factors for endometrial adenocarcinoma?
- Causes for excess estrogen
-Obesity
-Chronic anovulation/PCOS
-Nulliparity
-Early menarche or late menopause
-Tamoxifen use
Endometrial hyperplasia/cancer
1. clinical features?
2. way to evaluate
3. treatment
- Heavy, prolonged, intermenstrual &/or postmenopausal bleeding
- Endometrial biopsy (gold standard)
-Pelvic ultrasound (postmenopausal women) - Tx–
–> Hyperplasia: progestin therapy or hysterectomy
—> Cancer: hysterectomy
Amniotic fluid <=5 cm or single deepest pocket of amniotic fluid <2 cm on U/S indicates what?
oligohydramnios - primary cause is decreased fetal urine output
Decreased fetal urine output (oligohydramnios)
1. early gestation may indicate…
2. 2nd and 3rd trimester may indicate…
- renal abnormalities causing urine outflow obstruction (pos. urethral valve for ex) or impaired urine production (renal agenesis for ex)
- Second- and third-trimester oligohydramnios is typically due to rupture of membranes or decreased renal perfusion as the consequence of chronic uteroplacental insufficiency. In chronic uteroplacental insufficiency, placental dysfunction causes decreased fetal perfusion, oxygenation, and nutrition. In response, the fetus has decreased fetal movement (as in this patient), slowed growth (with possible fetal growth restriction), and preferential shunting of blood from the kidneys to the brain, resulting in decreased urine production and eventual oligohydramnios.
Acute postpartum urinary retention (>= 6 hours after vaginal delivery or urinary catheter removal after C section) causes
- an inability to void
- overflow incontinence
—> due to (BLANK) nerve injury and (BLANK).
- pudendal
- bladder atony
Risk factors include prolonged labor, perineal trauma, and regional neuraxial anesthesia.
How is postpartum urinary retention managed?
- self limited condition
- intermittent catheterization
- Patients with fetal growth restriction/FGF have a high risk for intrauterine fetal demise and require what for assessment?
- umbilical artery doppler ultrasound to assess placental perfusion.
–This test measures intravascular flow and resistance in the umbilical artery, with increasing resistance indicating decreasing placental perfusion and worsening fetal hypoxia. These measurements are used to identify patients who require urgent delivery to minimize the risk of fetal demise.
- severe, constant, unilateral pelvic pain may indicate ovarian torsion
1. How is this dx
2. How is this managed?
- This is a clinical diagnosis
- managed with diagnostic laparoscopy for manual detorsion of the adnexa and removal of any contributory cysts or masses; oophorectomy may be required if the ovary is necrotic
- Painless intermenstrual bleeding
- Women in 30s and 40s
- Most are benign and asymptomatic but can cause abnormal uterine bleeding
- Pts typically have regular monthly menses
What is this most likely?
- endometrial polyp
- Treat by hysteroscopic polypectomy
- Heavy, painful menses
- women age >40 years old
- Regular menses with no intermenstrual bleeding
- Boggy, uniformly enlarged uterus
- What is this likely?
- adenomyosis
- Regular but heavy, prolonged menses
- Irregularly enlarged, bulky uterus
- What does this sound like?
- Uterine leiomyomas (fibroids)
Hypertensive disorders of pregnancy
1. Chronic hypertension
– systolic and diastolic parameters
– age of gestation?
- Systolic pressure ≥140 mm Hg &/or diastolic pressure ≥90 mm Hg prior to conception or at <20 weeks gestation
Hypertensive disorders of pregnancy
1. Gestational HTN
-parameters and age of gestation?
- New-onset elevated blood pressure at ≥20 weeks gestation
- No proteinuria or signs of end-organ damage