Radio

Question 1

Uses of first trim usg

Answer 1

Confirm iup
Viability
Cardiac activity
No of fetuses
Chorionicity/amnionicity
NT scan
CVS
11-13 wks Uterine art doppler PIH predictor

Question 2

Times of appearance
Gsac
Yolk sac
Crl
Cardiac activity

Answer 2

G sac 4 wks
Yolk sac 5 wks
Crl 5 wks
Cardiac activity 6wks

Question 3

Critical val of hcg

Answer 3

TVS 2000iu/ml
TAS 6500IU/ML

Question 4

Criteria for missed abortion

Answer 4

MSD >= 25mm no fetal pole
CRL >= 7mm no cardiac activity
Prev scan shows gsac and no yolk sac >=2 wks later no cardiac activity

Question 5

Gest age estimation by usg

Answer 5

Most accurately 7 wks-9wks CRL + 42 gives days
Less than 7 wks MSD+ 30
T1 CRL
T2 Bpd
T3 FL and biometrics

Question 6

Calc gest age of twins by

Answer 6

Parameters of larger twin

Question 7

Uses of 2nd trim usg

Answer 7

Anomaly scan/level 2 scan

Cervical length–> 18-24wks if no ho ptl single usg
If h/o ptl 14-16wks serial usg till 24wks

AFI
Assist amniocentesis
Fetal growth

Question 8

Soft tissue markers in t2 usg

Answer 8

Increased Nuchal fold thickness>= 6mm
Absent nasal bone
Echo uc foci
Pyelectasis
Short femur
Echogenic bowel
Choroid plexus cyst

Question 9

Short femur marker for

Answer 9

Downs
Skeletal dysplasia
Iugr late onset

Question 10

AC best parameter of fetal growth usg plane?

Answer 10

Visualise umb vein draining into portal sinus and stomach bubble
Exclude insertion site of cord and kidneys

Question 11

Predictors of pih

Answer 11

Early doppler ut art at 11-13 wks
Umbilical art doppler at 22-24wks
Persistent diastolic notch beyond 24wks
Raised PI of ut art for gest age

Question 12

Nuchal translucency vs nucal fold thickness

Answer 12

Nt
First trim 11-14wks
More than 3mm abn

Midsagg plane
Landmarks: tip of nasal bone, hard palate, diencephalon
Measure of anechoic Lucent area between skin of neck and soft tissues overlying spine

Cb dilated lymph channels

R/o noonan sun, parvo inf, aneuploidy

Nft
2nd trim, 18-22wks
More than 6mm abn

Meas in Transverse place between skin and occiput
Landmarks: cerebella, CSP, thalami

Is normal fold of skin

Question 13

Nuchal translucency criteria

Answer 13

Plane: nasal bone tip+ hrd palate+ diencephalon
Head neutral
Magnification so only Heda neck upper thx seen
Space between Head and uterus- free floating head

Question 14

Pas usg diagnosis 5

Answer 14

Placental lacunae
Thinning of retroplac myometrium
Disruption of bladder uterus surface
Bridging vessels BTW ut and bladder
Placental bulge distorting ut