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Ob Gyne 3 > Module 13 - Multiple Gestations > Flashcards

Module 13 - Multiple Gestations Flashcards

1
Q

Most common type of twinning

A

Dizygotic (70%)

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2
Q

Hereditary on the maternal side

A

Dizygotic

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3
Q

Fertilization of two separate ova

A

Dizygotic

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4
Q

Two configurations of dizygotic twins

A

DC/DA and DC/DA fused

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5
Q

A single fertilized ovum replicates during early development

A

Monozygotic twins

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6
Q

Twin peak sign

A

Two placentas, two amniotic sacs

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7
Q

T sign

A

One placenta, two amnion

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8
Q

Types of monozygotic twin configurations

A

DC/DA (DI/DI)
MC/DA (Mono/Di)
MC/MA (Mono/Mono)
Conjoined

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9
Q

Incomplete division at embryonic disc stage with no separating membranes

A

Conjoined twins

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10
Q

Which baby is twin A?

A

The one closest to the cervix

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11
Q

Arterial-arterial or venous-venous shunts (anastomoses) in the placenta of monochorionic twins

A

TRAP syndrome (twin reversed arterial perfusion)

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12
Q

Parasitic twin within abdomen of its sibling

A

Fetus in fetu

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13
Q

A-A, V-V or A-V fistulas in the placenta of monochorionic twins only

A

Twin to twin transfusion syndrome

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14
Q

Recipient: large, hypertensive, polyhydramnios
Donor: small, hypotensive, oligohydramnios, “stuck” appearance

A

Twin to twin transfusion donor vs recipient

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15
Q

One baby has little or no fluid and the amniotic membrane holds baby tightly to uterine wall

A

Stuck twin

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16
Q

Fetal doppler profiles in the umbilical artery

A

Normal: lots of diastolic flow
Bad: no diastolic flow
Very bad: reversed diastolic flow

17
Q

Normal wave profile of the ductus venosus

A

ASVD wave (venous profile)

18
Q

Clots from a demised twin passed to the surviving twin in monochorionic

A

twin embolization syndrome

19
Q

Two ovum fertilized

A

Dizygotic

20
Q

Omphlopagus & Thoroacopagus

A

Most common types of conjoined twins

21
Q

One normal donor twin profuse the other abnormal twin. Abnormal twin has only lower legs and trunk and now heart of its own.

A

TRAP syndrome

22
Q

What size discordance would suggest the beginning of TTTS?

A

20%

Ob Gyne 3 (17 decks)

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