Ob Percentages Flashcards
What % of pts w/ PTL deliver w/in 7 days?
10%
What % of pts w/ PTL end up giving birth at term?
50%
McRoberts, suprapubic pressure, and delivery of the posterior arm will resolve what % of SD’s w/in 4 min?
95%
What % of PPH’s are d/t uterine atony?
70-80%
At what % blood loss do pt’s begin exhibiting s/s of acute blood loss?
25% (~ 1500ml)
What is the % risk of placenta accreta in pt’s w/ a h/o 1-6 CD’s?
H/o 1 CD: 0.2%
H/o 2 CD’s: 0.3%
H/o 3 CD’s: 0.6%
H/o 4 CD’s: 2%
H/o 5 CD’s: 3%
H/o 6 CD’s: 6%
What is the % risk of placenta accreta in pt’s w/ a placenta previa and h/o of 1-5 CD’s?
H/o 1 CD: 3%
H/o 2 CD’s: 10%
H/o 3 CD’s: 40%
H/o 4 CD’s: 60%
H/o 5 CD’s: 67%
What % of live newborns weigh >/=
4,000g?
4,500g?
5,000g?
4,000g: 8.0%
4,500g: 1.0%
5,000g: 0.1%
Of infants weight >/= 4,000g, what % are assc w/ GDM alone and what % are assc w/ GDM + obesity?
GDM: 13%
GDM + obesity: 22%
What is the % risk for LGA neonates in mothers w/
GDMA1?
GDMA2?
Pre DM?
GDMA1/2: 30%
Pre DM: 40%
An EFW > 4,500g is assc w/ an increased risk of _x for CD, SD, and PPH compared to non-macrosomic neonates.
CD: 2x higher incidence
SD: 7x higher incidence
PPH: 3x higher incidence
What is the % risk for SD w/ EFW > 4,500g + GDM?
20-50%
IOL at 37-38w for EFW > 95 %ile decreases risk of SD from ___% to ___%.
4%
1%
How many times more likely is a SD w/ a VAVD in the presence of macrosomia?
3-5x
What is the % incidence of PROM?
8%
For PROM w/ expectant management, what % of pts will deliver w/in 24 hrs?
95%
For PPROM, what % of pts will deliver w/in 1 wk?
50%
For PPROM, what % of pts will experience IAI? PP infxn?
IAI: 15-35%
PP infxn: 15-25%
For Periviable PPROM, what % of pts will deliver w/in 1 wk? 2 wks?
1 wk: 50%
2 wks: 80%
What is the risk increase of 3rd & 4th degree lacs s/p FAVD? VAVD?
FAVD: 6x
VAVD: 2x
What % risk is assc w/ ICH and neurologic sequelae s/p operative vaginal delivery?
ICH: 0.15%
Neurologic sequelae: 0.45%
What % of women will experience sx recurrence of HSV during pregnancy? at delivery?
Pregnancy: 75%
Delivery: 15%
What is the overall % success rate for ECV?
60%
What is the % risk of perinatal mortality for FGR and severe FGR?
FGR: 1.5% (2x normal risk)
Severe FGR: 2.5% (3x normal risk)
What is the recurrence risk of FGR?
20%
What is the % of severe maternal morbidity for CD vs SVD?
CD: 2.7% (3x higher)
SVD: 1.0%
What is the % expulsion rate for immediate pp IUD insertion?
10-25%
What is the rate for stillbirth? A h/o a stillbirth increases the rate by ___?
5/1000
5x higher (0.03%)
What is the % incidence (for breastfeeding women) of mastitis? mastitis w/ breast abscess?
Mastitis: 10%
Breast abscess: 3%
What is the incidence of pp urinary retention?
5/1000
What is the % incidence of mono/mono twins?
0.05%
What is the % fetal death rate for mono/mono twins?
17%
What are the % rates for nuchal cord x1, x2, and x3?
x1: 20-35%
x2: 2-5%
x3: 0.2-0.5%
What is the % risk of VTE in pregnancy w/ a h/o VTE? w/o h/o VTE?
H/o VTE: 10%
NO h/o VTE: 0.5-1.2%
What is the % risk of uterine rupture during TOLAC w/ a h/o low transverse uterine incision? IOL w/ TOLAC?
TOLAC: 0.5%
IOL: 1%
What is the % risk of recurrence of severe 3rd/4th degree laceration?
3%
What % of stillbirths have an abnormal karyotype?
5-15%
What is the % recurrence rate for PTD?
35%
Compared to Whites and Hispanics, Blacks have a ___% higher rate of PTD?
50%
What is the % recurrence risk for SD?
10-15%
What % of placenta accreta have concomitant previa?
80%
What % of pts w/ placenta accreta require a blood transfusion?
90%
What is the % risk of uterine rupture during TOLAC w/ 2 prior LTCS’s?
1-2%
What is the % risk of uterine rupture during TOLAC s/p classical hysterotomy incision?
1-12%
(Avg 5%)
What is the % plasma increase during pregnancy?
40-50%
What is the % RBC mass increase during pregnancy?
15-25%
What % of pregnancies are affected by FGR?
10%
What is the % risk of fetal death in FGR and severe FGR fetuses?
FGR = 1.5% (2x normal)
Severe FGR = 2.5%
What is the % recurrence risk for HELLP syndrome?
7%
What is the % risk of developing GHTN or PreE after a pregnancy w/ HELLP syndrome?
20% for each
What is the % risk of PPH in non-macrosomic, and macrosomic pts?
Non = 2%
Macrosomic = 5%
What is the % risk of CS in non-macrosomic and macrosomic pts?
Non = 12%
4,000g = 20%
4,500g = 27%
What is the % recurrence of lactational mastitis in pts w/ + w/o Lactobacillus probiotics?
W/ = 25%
W/o = 57%
What is incidence of placenta previa at < 20w vs > 20w?
< 20w = 5%
> 20w = <1% of the 5%
What % of complete placenta previas will resolve by term?
80-90%
What is the % recurrence risk for PTD?
15-20%
What is the incidence % of velamentous cord in singleton and monochorionic twin gestations?
Singleton = 1%
Monochorionic = 15%
What is the incidence of IUFD?
6/1,000
What is the incidence % of uterine rupture w/ a prior low vertical vs prior T-incision?
Low vertical = 1-7%
T-incision = 4-9%
What is the risk of OASIS w/ FAVD?
3-11%
What % of pts w/ PTL have spontaneous resolution?
30%
TXA reduces the mortality rate from obstetrical hemorrhage from 1.7% to _.
1.2%
What is the rate of uterine rupture in IOL for pts undergoing TOLAC w/ and w/o PGE use?
W/ PGE = 2.25%
W/o PGE = 0.7%
What is the rate of stillbirth for women under 35yo compared to the rate for AMA women?
< 35 = 5/1,000
AMA = 15/1,000
What is the rate of stillbirth in women w/ SLE?
50-150/1,000
What is the incidence % of acute pyelonephritis in pregnancy?
1-2%
What is the rate of endometritis in SVD pts and in CD pts prior to ROM?
SVD = 1-3%
CD = 5-15%
What is the risk of having a fetus w/ a neural tube defect when there is one affected sibling?
3%
What % of all malignant tumors diagnosed during pregnancy are Dysgerminomas?
30% (MC ovarian malignancy dx’d in pregnancy)
