Repro Flashcards
Epidemiology of Preeclampsia
Increased incidence with: - multiple gestations - Chronic HTN - Previous history of preeclampsia - Renal disease - DM Prior to 20 weeks, preeclampsia pathognomonic for molar pregnancy
Pathophysiology of preeclampsia
Abberation in normal interaction between fetal allograft and maternal tissue
Vascular Changes: normal migration of trophoblast into uterus with spiral arterioles causes uteroplacental arteral bed into low resistance, high flow system
Preeclampsia= defective vascular changes–> decreased blood supply, fibrotic vascular changes, endothelial injury
- see vasospasm, coagulation system activation, abnormal hemostasis–> endothelial injury, increased platelet activation, platelet consumption–> decreased intravascular volume
Renal system changes in preeclampsia
Renal: nL= increased renal plasma flow, GFR
Preeclampsia = vasospasm, capillary endothelial swelling–> reduced GFR, increased uric acid, creatinine
Hemodynamic changes in preeclampsia
Normal= Prostacyclin, thromboxane A2 increased in pregnancy (PGI > TXA) - PGI allows for vasodilation, inhibits platelet aggregation Preeclampsia= TXA>PGI Capillary leak (proteinuria, edema) NO reduced (less vasodilation)
Hepatic system changes in preeclampsia
Transaminase elevations in about 10% cases
Hematologic changes in preeclampsia
Thrombocytopenia
Severe= decreased fibrinogen, increased PT, PTT (seen in DIC)
Severe preeclampsia
BP >= 160/110 Proteinuria= 5 g/24 hour urine or dip +3 to +4 Oliguria Cerebral/visual disturbances (could be close to developing eclampsia) Epigastric pain (HELLP) Pulmonary edema Impaired liver function Thrombocytopenia
Treatment: delivery if maternal complications of abNL fetal testing
32 weeks: deliver
HELLP sydrome
Hemolysis, Elevated Liver enzymes, Low Platelets
2-12% cases of preeclampsia (severe)
DIC, periportal liver necrosis, hemorrhage, coma, nephrogenic diabetes insipidus, subcapsular liver hemotoma
May see NO HTN, proteinuria
Present with RUQ/epigastric pain, N/V
Maternal Complications of Preeclampsia
Death CVA DIC Placental abruption- 5% renal failure Subcapsular liver hematoma/rupture Pulmonary edema Eclampsia Liver failure
Fetal complications of Preeclampsia
Death- 10% Prematurity RDS (respiratory distress syndrome) IVH (intraventricular hemorrhage) Retinopathy Necrotizing enterocolitis BPD (bronchopulmonary dysplasia) IUGR (intrauterine growth restriction)- 18% Fetal asphyxiation
Treatment of preeclampsia
Only cure= delivery
Mild preeclampsia: deliver if >= 36 weeks
Severe preeclampsia: deliver if >= 32 weeks
Magnesium sulfate= best agent for treatment of eclampsia seizures, prophylaxis in preeclampsia
Mild preeclampsia
HTN: 120-140/70-90
Proteinuria= 300 mg/24 hours or 0.1 g/L spot
Deliver greater than 36 weeks
delivery
Magnesium sulfate
anticonvulsant, more efficacious than dilantin
Slows NM conduction, depresses CNS irritability
Renal excretion
Toxic levels= somnolence, respiratory difficulty, cardiac arrest
Eclampsia
Convulsions unrelated to other condutions, + evidence of preeclampsia
2-4% of preeclampsia patients
Headache, visual symptoms, RUQ/epigastric pain
Short-lived convulsions (60-75 seconds)
Recurrence rates of preeclampsia
25% in second pregnancy
severe preeclampsia–> 65% recurrence
HELLP recurrence low
Prevention: low dose aspirin (10-20% reduction in recurrence), calcium
Low risk HPV types
Associated with warts
6, 11
40, 42, 43, 44, 53, 54, 61, 72, 73, 84
High risk HPV types
Associated with cervical cancers (at least found in any case of cervical cancer), other cancers of genital tract
16, 18, 45
31, 33, 35, 39, 51, 52, 56, 58, 59, 68, 82
HPV and cervical cancer
HPV 16 found in 50% of cervical cancers, most commonly identified in HSIL
HPV 18= squamous carcinoma, adenocarcinoma, cervical adenocarcinoma in situ
* HPV clearance: 50% by 6 months, 66% at 12 moths, 80% at 2 years- only when integrated into genome can lesion progress from LSIL to HSIL or carcinoma
ASCUS (pap smear)
Atypical squamous cells of undetermined significance
- 5-7% chance of biopsy confirmed CIN 2/3, but only 0.1% chance of invasive carcinoma (therefore need follow-up hr-HPV DNA testing)
- ASCUS pap with positive HPV DNA has 30% incidence of high-grade lesion on colposcopy
ASC-H (pap smear)
Atypical squamous cells, cannot exclude high grade lesion
* colposcopy reading shows 25% to have severe pre-cancerous changes
AGC (pap smear)
Atypical glandular cells
AIS (pap smear)
Adenocarcinoma in situ
Possible high risk HPV
22, 66, 73
Detection of HPV
Liquid-based pap: can use residual material to detect high risk HPV DNA via:
Hybrid capture 2
Cervista
PCR
- only recommended for women >30, performed every 3 years (or 6 years with pap smear)
Hybrid capture 2 HPV detection
Detection of 13 high-risk types of HPV DNA in cervical specimens
Nucleic acid hybridization assay with signal amplification
Qualitative detection using microplate chemiluminescence
* See which strands light up to indicate a high risk HPV strain present in sample
Cervista HPV detection
Screens for 14 types of HPV strains
Indications for using high-risk HPV DNA testing
- Women over age 20 with ASCUS results (unclear significance of pap smear)
- If negative for hr-HPV, no need to perform culposcopy
- If patient < 20 years, perform repeat cytology in 12 months - Post-treatment surveillance of women with CIN 2/3
* Failure of surgical excision 1-25%: need to perform to ensure no persisting cancer cells - Adjunct to pap test in primary cancer screening in women over 30 (not recommended for women <30 because HPV so prevalent but most cases handled by immune system)
Management of CIN (cervical intraepithelial lesions)
- ASCUS: 20 years: hrHPV, if +, colposcopy
- LSIL: < 20 years: reperform cytology in 12 months
> 20 years: colposcopy - HSIL: 70% chance of CIN2-3
1% risk of invasive cancer
Colposcopy for diagnosis followed by excision
Recommendations for HPV screening
< 21 years: no screening
21-29 years: cytology alone every 3 years
30-65 years: HPV and cytology every 5 years (preferred), cytology every 3 years (acceptable)
>65 years: no screening follwing adequate negative prior screening
After hysterectomy: no screening (if no history HSIL)
HPV vaccinated: continue to follow screening recommendations for age group
High risk women need to be screened more frequently (high risk= HIV, organ transplant, exposure to DES)
Fertilization to implantation timeline
30 hrs: 2 cell organism
3rd day: 12-32 cell solid morula (totipotent)
- Arrives in uterus
6th day: Hollow blastocyst (250 cells) implants into uterus
Implantation to 12 weeks LMP timeline
6-9 days post fertilization= implantation
- inner layer= ecto, endo, mesoderm (fetus)
- outer layer= trophoblast (placenta, fetal membranes)
4 weeks: 6 mm embryo, 1,000,000s cells
5 weeks: human appearance (extremities, cerebral hemispheres)
6 weeks: heartbeat
12 weeks: external genitalia, fetus excretes urine
Spontaneous abortion
15% of known pregnancies (25-35% all pregnancies)
50% due to chromosomal abnormalities
80% in first trimester
Risk factors= toxicity (smoking, drugs, alcohol), medical illness (DM, HTN, thyroid), age (>35 for women, 50 for men), infection, uterine abnormalities
Missed abortion
Closed cervix
Fetus dead but still in uterus
Management=
- Expectant (wait for body to expel)
- Medical (prostaglandin–> contractions)
- Surgical (EVA, MVA)
- expectant and medical managment have a higher risk of hemorrhage
Threatened abortion
Close cervix
Uterine bleeding/passage of tissue before 20 weeks
25% of all pregnancies
50% of threatened pregnancies result in viable infants (but have higher incidence of prematurity, lower birth weight)
Managment:
- Expectant (not much done except avoiding sex)
- Monitor: serial beta-hCG (is it ectopic or molar pregnancy causing bleeding?), ultrasound, pelvic rest (not bed rest)
Complete abortion
Closed cervix
History of uterine bleeding, cramping (all products of conception passed)
Managment:
- Expectant
- Medical (uterotonics= methergine, misoprostol)
- Surgical (EVA, MVA)
- risk of another miscarriage goes up, but most women go on to have a healthy pregnancy
Incomplete abortion
Open cervix
Uterine bleeding, cramping, passage of some products of conception <20 weeks
Managment:
- Expectant, medical, surgical
- highest risk of post-partum hemorrhage
Recurrent abortion
At least 3 pregnancies lost before 20 weeks
ID and treat possible underlying causes:
- Uncontrolled DM
- Uterine synechiae (scarring), defects
- antiphopholipid antibody syndrome (autoimmune disease)
- Chromosomal abnormalities
Molar pregnancy
Complete= 46 XX (2 sperm, empty egg)- no fetal formation Incomplete= 69 XXY (2 sperm + 1 egg)- chromosomally abnormal fetus
Symptoms= patient “pregnant” but sick (vaginal bleeding, nausea/vomiting, increased BP; disproportionately enlarged uterus, tachycardia, tachypnea, snowstorm ultrasound
Managment: surgical (evacuation) + post-op monitoring of beta-hCG to prevent gestational trophoblastic neoplasia
Diagnosis of ectopic pregnancy
Risk factors= prior ectopic pregnancy, tubal surgery, history of PID, in utero DES exposure, cigarette smoking
Symptoms= vaginal bleeding/amenorrhea, pelvic pain, adnexal mass, 50% asymptomatic
Tests= ultrasound (empty uterus), beta hCG monitoring (will not rise appropriately), low serum progesterone
Management of ectopic pregnancy
Medical= methotrexate 50 mg/m2 IM
Patient MUST be: hemodynamically stable, can return for follow-up, no contraindications for methotrexate, unruptured, mass < 3.5 cm, no fetal heart activity, beta hCG <15,000
Contraindications to medical managment= breast feeding, immune compromised, abnormal liver/kidney function, sensitivity
Surgical= laproscopic salpingostomy (remove tissue) or salpingectomy (remove tube) or laparotomy