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OB Hemorrhage
Obstetrics
Question | Answer |
---|---|
Most common cause of postpartum hemorrhage | Uterine atony (unable to contract and control bleeding) |
extravasation of blood into the myometrium = | Couvelaire uterus |
Placenta previa sx | Spotting in 1st & 2nd trimesters. Sudden painless vaginal bleeding in 3rd. Soft, nontender uterus. |
Abruptio placenta RF | HTN; trauma; folate deficiency; smoking; cocaine; PPROM; chorioamnionitis; rapid decompression of the uterus; thrombophilia; older mom; multiple gestation. |
Causes of postpartum hemorrhage | uterine rupture/ inversion; birth trauma; retained placenta; uterine atony; DIC; von W dz |
Uterine inversion associated with: | uterine atony, fundal placenta, first baby; not necessarily with cord traction |
Uterine inversion sx | shock out of proportion to blood loss |
Uterine inversion tx | Replacement; relaxing agent; laparotomy? |
Uterine atony RF | Chorioamnionitis; over-distended uterus; long labor; oxytocin in labor; MgSO4; genl anesthesia; multiparity; previous postpartum hemorrhage |
Uterine atony tx | Oxytocin; PG F2 alpha (Hemabate); misoprostol; methergine; bimanual compression |
Types of placental abruption | Grade 1 (mild, slight bleeding). Grade 2 (moderate to partial). Grade 3 (large or complete): concealed (blood is retained between detached placenta & uterus) |
risks associated with PROM & PPROM | Infection (chorioamnionitis & endometritis); cord prolapse |
Placental tissue in the lower uterine segment over, or adjacent to, the cervical os = | Placenta previa (results in coverage of cervix, ahead of presenting fetal part) |
In placenta previa, bleeding results from: | separation of placenta from lower uterine segment and cervix |
Placenta previa risk factors | Prior uterine surgery, C-section, D&C, D&E. Older pt. Endometrial vascularity abnormality. Delayed ovulation. Multiparity. Smoking. |
Dx of placenta previa should be done by: | Ultrasound. NOT BY PELVIC EXAM |
Grade 3 placental abruption should be considered: | life threatening to mother and fetus |
Placental abruption pathology | Bleeding into decidua basalis -> separation -> decidua splits and placenta is sheared off -> extravasation into myometrium |
Bleeding >500 mL with vaginal delivery or >1000 mL with C-section | postpartum hemorrhage (early <24h post; late >24h post, up to 6-12 weeks post partum) |