Numbers 5 Flashcards
% of positive GBS swabs at 35-37/40 weeks that are negative at delivery
17-25%
% of negative GBS swabs at 35-37/40 weeks that are positive at delivery
5-7%
Risk EOGBS if previous baby with GBS
1:700-800
50% carriage
Risk EOGBS with positive swab
1:400 or 2:1000
Risk EOGBS with negative swab
1:5000
Overall incidence EOGBS (BG)
0.57:1000 OR 1:2000
Risk of EOGBS if preterm
2.3:1000
Risk of EOGBS if PIL
5.3:1000
% planned vaginal breech deliveries needing EMCS
40%
Risk of stillbirth in VBAC
10:10,000
% breech undiagnosed
25%
Incidence of interlocking twins
1:817
Risk DIC within 4 weeks of IUD
10%
Risk of DIC >4 weeks of IUD
30%
% of major contributor to death found in placentas
88%
% IUD deliver spontaneously within 3/52
> 85%
% vaginal births achieved within 24hrs with IOL for IUD
90%
% women with sepsis during IOL for IUD
3%
% vasa praevia that resolves in 3rd trimester
15%
Incidence of adverse fetal outcomes in primip homebirth
9:1000
BG 5:1000
% homebirths transfer to obstetric unit for FTP in 1st stage
32%
Risk of serious neonatal infection with SROM
1%
Risk serious neonatal infection with intact membranes
0.5%
% that labour within 24hrs ROM
60%
1st stage of labour lasts an average…
8hrs
unlikely >18hrs
2nd and subsequent labours last an average…
5hrs
unlikely >12hrs
Maternal collapse incidence
0.14-6;1000
MOH incidence
3.7:1000
Aortocaval compression reduces venous return by…
30-40%
Placenta receives how much of cardiac output
10%
Risk chorioamnionitis in PPROM
30%
Mortality rate of severe sepsis
20-40%
Mortality rate of septic shock
60%
Recurrence of abruption if 2 previous abruptions
19-25%
% women with persistent vaginal discharge after UAE
16% at 12/12
% fibroid expulsion after UAE
10%
% diabetes in pregnancy
5%
% PET in diabetic pregnancies
10-20%
Aim BM in diabetic pregnancy when fasting/on waking
<5.3mmol/L
Aim BM in diabetic pregnancy before meals
4-7mmol/L
Aim preconception HbA1C
<48 or <6.5%
Avoid pregnancy if preconception HbA1c is…
> 86 or >10%
Aim BM in diabetic pregnancy 1hr post-prandial
<7.8
Aim BM in diabetic pregnancy 2hr post-prandial
<6.4
% of GDM needing Metformin or Insulin
10-20%
Level of fasting BM prompting immediate insulin treatment
> 7
Level of fasting BM prompting immediate insulin treatment if macrosomia or polyhydramnios
> 6
% of increasing insulin requirement in pregnancy with pre-existing DM
30%
% risk children of T1DM develop DM
5-6%
% risk children of T2DM develop DM
10-15%
Aim BM in T1DM preconception fasting/waking
5-7
Aim BM in T1DM preconception premeal
4-7
% risk of macro prolactinoma enlargening in pregnancy
30%
Incidence diabetes insipidus in pregnany
1:30,000
Head entrapment in extreme preterm breech delivery
- 3%
5. 6% by CS
Serious maternal risks in classical CS
23%
% women with DI who deteriorate in pregnancy
50%
CAH carrier incidence
1:60
% women with CAH + adequate vaginal introitus who are fertile
30-60%
% thyroid disorders in pregnancy
2-3%
% neonatal thyrotoxicosis with passage of TSH receptor antibodies
1-5%
Mortality 12-20%
% women with hyperemesis gravidarum with gestational thyrotoxicosis
12-20%
TSH level in hypothyroidism
> 10, irrespective of T4
% subclinical hypothyroidism in pregnancy
2-5%
TSH 2.5-10
RCOG recommendation of Vit D per day
1000IU
Aim TSH level during 1st trimester
0.2-2.5
Aim TSH level during 2nd trimester
0.5-3.0
% who die of cardiac failure from iron overload
50%
Aim MRI T2 level in beta thalassaemia
> 20ms
MRI T2 level in beta thalassaemia associated with cardiac failure
<10ms
Aim for liver iron in b thalassaemia
<7mg/g
Liver iron level that requires iorn chelation
> 15mg/g
% alloimmunity in beta thalassaemia
16.5%
pretransfusion Hb level aim in beta thalassaemia major
> 100
% AKI in UK pregnancies
1.4%
Risk alloimmunisation in SCD
18-36%
% SCD with crisis in pregnancy
27-50%
% OC in pregnancy
0.7%
UK risk stillbirth in OC
5.6:1000
% meconium in OC if BA >40
44%
% meconium in OC
25%
OC recurrence
45-90%
% of neonates with haemophilia and no FH
50%
Chance mother is carrier if neonate has haemophilia
90%
% Haemophilia with clotting factor antibodies
10-40%
Normal Factor VIII/IX levels
0.5-2iu/ml
Mild haemophilia
0.06-0.4
Moderate haemophilia
0.01-0.05
Severe haemophilia
<0.01
Aim of factor level for procedures
at least 0.5iu/ml
Aim of factor level if treatment needed
1iu/ml
Overall risk of epidural haematoma
1:16,800
Prevalence of clinically relevant von Willebrand’s disease
1:10,000
Risk of primary PPH in von Willebrand’s disease
15-30%
Risk of secondary PPH in von Willebrand’s disease
25%
Aim of VWF:RCo activity
> 0.5iu/ml
aim >1 when treating
Increased risk of VTE with antithrombin deficiency
30%
% of fetuses exposed to warfarin between 6-12/40 that develop warfarin embryopathy
5%
Incidence of PIH
4.2-7.7%
% thrombocytopenia caused by gestational thrombocytopenia
75%
% thrombocytopenia caused by hypertensive disease of pregnancy
15-20%
Platelet aim for regional anaesthesia
> 80
Platelet aim for vaginal delivery
> 50
% extensive ICH in severe NAIT
20%
Relative risk of VTE in puerperim
20 fold
% untreated DVT that leads to PE
15-24%
Risk of childhood cancer with V/Q scan
0.5mGy
(BG 1:17,000/mGy
Risk childhood cancer with CTPA
0.1mGy
BG 1:17,000/mGy
Increased risk of breast cancer with CTPA
13.6%
BG risk 0.1% therefore woman’s risk is 0.236%
% of VTE in pregnancy with underlying heritable or acquired thrombophilia
50%
% of women developing post thrombotic syndrome post DVT
42%
