Obstetrics & Gynaecology

what is Gravidity

Number of pregnancies including the present one

What is Parity

number of times the woman has given birth

What is Menstrual/Gestational Age

FIRST day of last LNMP

What is Conceptual/Embryologic Age

FIRST day of pregnancy (2 weeks less than gestational age)

State Nagele’s Rule

EDD = LNMP – 3 months + 7 days

Zygote

12 days after conception

Embryo

implantation until end of 10th week menstrual age

Foetus

after 10 weeks

What is chorionicity and amnionicity

how many placentas and amniotic cavities

‘double bleb’ sign

amniotic sac, foetal pole, yolk sac

Nuchal Translucency

11 and 13 weeks 6 days CRL between 45 and 84mm

Yolk Sac measurements TA

MSD 10-15mm

Yolk Sac diameter

4 – 6mm

Yolk sac growth

0.33mm per day

Macrosomia

Foetus over 4000g

Dolicocephalic & Bradycephalic

Long and narrow & Rounded

3 parts of a blastocyst

Trophoblast (outer layer) embryonic portion of placenta---- blastocyst - fluid filled cavity --------- embryoblast, develops into embryo

3 Types of breech

complete, incomplete (footing) and frank

Polyhydramnios

increase in amniotic fluid

Poly causes

CNS disorders , GIT problems, Macrosomia

Oligohydramnios

decrease in amniotic fluid

Oligo assoc anomalies

- Bilateral renal agenesis, Polycystic kidneys, BOO, Limb contractures