Obstetric random stats Flashcards
Risk of cord prolapse
- 0.1/0.6%
- 1% in breech presentation
Risk of placenta praevia
1:200
Risk of caesarean hysterectomy in VBAC
0.06%
Perinatal mortality in cord prolapse
91/1000
Risk of PET in general population
2-3%
1.6 - 10 : 10 000
Risk of Eclampsia
- 38% antepartum
- 18% intrapartum
- 44% postpartum
Balanced translocation (13,14,15,22) stats
- In mother 1 : 8
- In father 1 : 40
- If either parent has “21” translocation the risk of Downs will be 100%
Recurrence of neural tube defect
- 2 - 3 %
- Spina bifida: 1 - 5 %
Fetal alcohol syndrome %
- 1 -2 : 1000
- 30 - 33 % women who drink > 18 units per week
Congenital heart disease risk
- If you have one child: 1.5 - 5 %
- if mother has it: 2.5 - 18 % ( average 6 - 7%)
- If father has it: 1.5 - 3 %
- Mothers with ASD have a risk of 5-10% of their fetuses having the same
- Mother having aortic stenosis have 18-20% chance of their baby developing it
Incidence of tetralogy of fallot
0.4 : 1000
Incidence of Klinefelter
1 : 1000
Incidence of trisomy 18
1 : 8000
Risk of AFE
1 : 80 000 deliveries
GDM recurrence
66%
Peripartum cardiomiopathy incidence
1 : 1500 to 1 : 15 000
Incidence of CAH
1 : 10 000 to 1 : 20 000
Incidence of vit D rickets
1 : 20 000
Congenital diaphragmatic hernia stats
- Mortality 40 - 62%
- Survival > 80%
% velamentous insertion of the cord
1:100
% pregnant population to have invasive testing
5%
30 000 women
% complication of bloody tap during amnio
25:1000
Maximum size needle for amnio at 15 weeks
20G
Typical result of triple test for Down’s syndrome
- Reduced AFP
- Reduced oestradiol
- Increased hCG
NSAIDS given in 3rd trimester gives what risk
Premature ductus arteriosus closure and pulmonary hypertension
Mean corposcular volume which would need testing at booking
Appendicitis surgery and fetal loss
- Strightforward appendicectomy: 1.5 %
- With generalised peritonitis 6%
- If the appendix perforates as high as 36%
- Up to 35% of laparotomies may be negative
Anaesthetic risks in pregnancy
- General anaesthetic carries a 17-fold higher risk of complications to the pregnant woman than regional anaesthesia
- Failed intubation (in 3.3% due to pregnancy induced oedema, short neck, engorged large breasts)
- Aspiration of gastric contents (Mendelssohn syndrome)
- Hypoxia
- Pregnant women desaturate far quicker than nonpregnant women (3 minutes as opposed to 9 minutes)
% risk of enchephalopaty with pH
2.95 %
