Fetus 2 Flashcards
Uses of USG during pregnancy.
To diff btw Ectopic, Intrauterine and Twin pregnancy
High freq USG provides.?
Better Resolution
Low Freq USG .?
Better Penetration.
ALARA principle.?
As Low As Reasonably Advised.
Limit of USG freq in preg.
1) Low Preg
2) Late 1st and 2nd trimester
3) 3 rd trimester.
1) 5-10
2) 4-6
3) 2-5
Routine USG which Mode.?
B mode.
Which USG mode to check Cardiac activity.?
M mode
Gestational Sac seen in TVS @ and TAS @
TVS @ 4 wks and TAS @ 5 wks.
Yolk Sac seen in TVS @ and TAS @
TVS @ 5 wks
TAS @ 5.5 wks
Cardiac activity is seen in TVS and TAS @
TVS @ 5-6 wks
TAS @ 6-7 wks
1st Sign of Pregnancy on USG
Gestational Sac
1st sign of IU pregnancy on USG
Yolk Sac.
Most important use of USG
Detecting Congenital malformations.
Blighted ovum.?
Mean sac diameter > 25mm and no fetal tissue or yolk sac and no cardiac activity.
Type 1 USG can detect .?
Anencephaly.
Type 2 USG aka.
TIFFA - Targeted imaging for fetal anomalies.
When is TIFFA done.?
16-20 wks.
best time to detect anencephaly on USG
14 weeks.
Signs of anencephaly on USG
Frog eye sign and mickey mouse sign
Signs of spina bifida on USG
Lemon sign and Banana sign.
Lemon SIgn.
sign of Spina Bifida.
Frontal bone scalloping.
Banana sign.
Sign of spina bifida.
Elongation and downward displacement of cerebellum.
Ventral wall defects.
size of ventral wall > 7mm
continues after 12 weeks.
Omphalocele and Gastroschisis.
Omphalocele.
Herniated bowel covered by sac.
