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ARDMS- OB/GYN Exam Prep > Multiple Gestations Terminology > Flashcards

Multiple Gestations Terminology Flashcards

1
Q

An abnormally developed twin that has as absent upper body and no heart; also referred to as parasitic twin; also referred to as twin-reversed arterial perfusion sequence

A

Acardiac Twin

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2
Q

The inner sac that contains the embryo and amniotic fluid; echogenic curvilinear structure that may be seen during the first trimester within the gestational sac

A

Amnion

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3
Q

Related to the number of amnions in a multiple gestation

A

Amnionicity

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4
Q

Fluid-filled space, created by the amnion, surrounding surrounding the developing embryo or fetus

A

Amniotic Sac

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5
Q

Vascular connections

A

Anastomoses

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6
Q

The condition of having a deficient number of red blood cells

A

Anemia

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7
Q

The outer membrane of a gestation that surrounds the amnion and developing embryo

A

Chorion

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8
Q

Relates to the number of chorions and the type of placentation in a multiple gestation

A

Chorionicity

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9
Q

The division of a cell

A

Cleavage

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10
Q

Monoamniotic, monochorionic twins that are attached at the head, thorax, abdomen, or lower body

A

Conjoined Twins

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11
Q

Twins joined at the cranium

A

Craniopagus

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12
Q

Having two amniotic sacs

A

Diamniotic

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13
Q

Having two placentas

A

Dichorionic

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14
Q

Having two placentas and two amniotic sacs

A

Dichorionic Diamniotic

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15
Q

Asymmetric fetal weight between twins

A

Discordant Fetal Growth

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16
Q

Two ova are fertilized by two sperms

A

Dizygotic

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17
Q

A treatment that uses lasers to separate abnormal placental vascular connections between twins that are suffering from twin-twin transfusion syndrome

A

Endoscopic-Guided Laser Photocoagulation

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18
Q

The death of one fetus in twin pregnancy that is maintained throughout the pregnancy; actually means paperlike fetus

A

Fetus Papyraceus

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19
Q

Twins that result from the fertilization of two separate ova and have dissimilar characteristics

A

Fraternal Twins

20
Q

An abnormal accumulation of fluid at least two fetal body cavities

A

Hydrops (fetal)

21
Q

A shortage of oxygen or decreased oxygen in the blood

A

Hypoxia

22
Q

Twins that result from the split of a single zygote and share the same genetic structure

A

Identical Twins

23
Q

A triangular extension of the placenta at the base of the membrane is indicative of a dichorionic diamniotic pregnancy; also referred to as the delta sign or the twin peak sign

A

Lambda Sign

24
Q

Having one amniotic sac

A

Monoamniotic

25
Q

Having one chorion

A

Monochorionic

26
Q

Having one placenta and two amniotic sacs

A

Monochorionic Diamniotic

27
Q

Having one placenta and one amniotic sac

A

Monochorionic Monoamniotic

28
Q

Coming from one fertilized ovum or zygote

A

Monozygotic

29
Q

The relative frequency of occurrence of a disease

A

Morbidity

30
Q

The rate of actual deaths

A

Mortality

31
Q

Conjoined twins attached at the abdomen

A

Omphalopagus

32
Q

An unfertilized egg

A

Ovum

33
Q

Formation or structure of a placenta, structural organization, and mode of attachment of fetal to maternal tissues during placental formation

A

Placentation

34
Q

The development of a cystic cavity within within the cerebrum; may be the result of an intraparenchymal hemorrhage

A

Porencephaly

35
Q

Conjoined twins joined back-to-back in the sacral region

A

Pyopagus

36
Q

A single developing fetus

A

Singleton Pregnancy

37
Q

Dead at birth

A

Stillborn

38
Q

When a twin fetus, suffering from twin-twin transfusion syndrome, experiences severe oligohydroamnios and is closely adhered to the uterine wall

A

Stuck Twin

39
Q

Type of amniocentesis used to remove a large amount of amniotic fluid around a fetus suffering from polyhydroamnios

A

Therapeutic Amniocentesis

40
Q

Conjoined twins attached at the chest

A

Thoracopagus

41
Q

When vascular products travel from a demised twin to the surviving twin by means of the common vascular channels within the shared placenta

A

Twin Embolization Syndrome

42
Q

Shunting of venous or arterial blood from one twin to another through placental circulation

A

Twin-twin Transfusion Syndrome

43
Q

The death and reabsorption of a twin

A

Vanishing Twin

44
Q

Relates to the number of zygotes (fertilized ova)

A

Zygosity

45
Q

The cell formed by the union of two gametes; the first stage of fertilized ovum

A

Zygote

ARDMS- OB/GYN Exam Prep (34 decks)

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