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OBSTETRICAL DMS 114 > Normal First Trimester > Flashcards

Normal First Trimester Flashcards

1
Q

cavity in which the fetus exists; it forms early in gestation and fills with amniotic fluid to protect the fetus

A

amniotic cavity

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2
Q

surrounds the amniotic cavity; the yolk sac is within the chorionic cavity

A

chorionic cavity

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3
Q

invasive diagnostic genetic testing that involves sampling zygotic cells from developing placental tissue

A

chorionic villi sampling (CVS)

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4
Q

most accurate measurement of the embryo in the first trimester

A

crown-rump length (CRL)

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5
Q

the uterine decidual surface on the maternal side of the placenta; the decidual basalis is invaded by trophoblastic cells that form the placenta

A

decidua basalis

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6
Q

the uterine decidua on the surface of the implantation site. As the pregnancy progresses, the decidua capsularis may shed, causing light early pregnancy bleeding

A

decidua capsularis

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7
Q

multiple pregnancy with two amniotic sacs

A

diamniotic

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8
Q

multiple pregnancy with two chorionic sacs

A

dichorionic

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9
Q

interface between the decidua capsularis and the echogenic, highly vascular surface on the opposite side of the endometrial cavity

A

double decidual sac sign

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10
Q

age calculated from when conception occurs

A

embryologic age (conceptual age)

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11
Q

time between 4 and 10 weeks’ gestation

A

embryonic period

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12
Q

production and development of blood cells

A

hematopoiesis

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13
Q

hormone secreted by the trophoblastic cells (developing placental cells) of the blastocyst; laboratory test indicates pregnancy when values are elevated

A

human chorionic gonadotropin (hCG)

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14
Q

intrauterine pregnancy

A

IUP

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15
Q

length of time calculated from the first day of the last normal menstrual period (LMP) to the point at which the pregnancy is being assessed

A

menstrual age (gestational age)

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16
Q

multiple pregnancy with one amniotic sac

A

monoamniotic

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17
Q

multiple pregnancy with one chorionic sac

A

monochorionic

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18
Q

mean sac diameter

A

MSD

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19
Q

first site of formation of red blood cells that will nourish the embryo

A

primary yolk sac

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20
Q

formed at 23 days when the primary yolk sac is pinched off by the extraembryonic coelom

A

secondary yolk sac

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21
Q

high-frequency transducer that is inserted into the vaginal canal to obtain images of first-trimester pregnancy

A

transvaginal (TV) transducer

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22
Q

the umbilical duct connecting the yolk sac with the embryo

A

yolk stalk

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23
Q

the conceptus resulting from the union of male and female gametes. In a normal pregnancy, the zygote travels through the tubes and implants in the uterus

A

zygote

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24
Q

Which area of the embryo attaches to the amnion?

A

umbilical insertion

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25
Q

Gestational weeks 6 through 10 constitute the:

A

embryonic phase

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26
Q

Which of the following formulas calculates the mean sac diameter of the gestational sac?

A

(length + height + width)/3

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27
Q

The chorionic cavity should no longer be visible after how many gestational weeks?

A

16

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28
Q

The mean sac diameter measures gestational age before visualization of the:

A

embryo

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29
Q

Which is the most accurate method for measuring gestational age?

A

crown rump length (CRL)

30
Q

Normal human chorionic gonadotropin levels should _____ every _____

A

double every 30 to 48 hours

31
Q

When measuring the mean sac diameter, the calipers should be placed from the ____ wall to _____ wall

A

inner wall to inner wall

32
Q

What lines the chorion and contains the fetus?

A

amnion

33
Q

The term embryo is used to describe a developing zygote through the ____th gestational week

A

10th

34
Q

-organogenesis is generally completed by the 10th gestational week

A

TRUE

35
Q

What is the membrane called that surrounds the fetus or embryo?

A

amnion

36
Q

What is the name of endometrial layer that is on the maternal side?

A

decidua basalis

37
Q

The placenta develops from the _____________?

A

chorion

38
Q

True or False: The FHR should be 140 +/- 20 BPM by 9 weeks.

A

TRUE

39
Q

What produces amniotic fluid in the 1st trimester?

A

amnion

40
Q

What is the cystic structure that is noted in the fetal head?

A

Rhombencephalon

41
Q

When should the amnion and chorion be fused?

A

14 weeks

42
Q

12 days after conception, during the implantation process

A

zygote

43
Q

From the time of implantation until the end of the 10th week menstrual age

A

embryo

44
Q

After the first 10 weeks

A

fetus

45
Q

conception as first day of pregnancy

A

conceptual age or embryologic age

46
Q

First day of last menstrual period as the beginning of gestation

A

gestational or menstrual age

47
Q

Fertilization occurs withing ______ days after ovulation.

A

1 to 2 days

48
Q

At approximately _____ days menstrual age, the primary yolk sac is pinched off by the extraembryonic coelom, forming the secondary yolk sac. The amniotic chorionic cavities also develop and evolve during this period of gestation.

A

23

49
Q

The embryonic phase occurs from week ______. During this phase all major internal and external structures begin to develop.

A

4 through week 10

50
Q

The cardiovascular system undergoes rapid development, with the initial heartbeat occurring at between _______ weeks or ____ days.

A

5.5 to 6 weeks or 35 days

51
Q

The crown-rump length measures _____ by the end of the 10th week.

A

35mm

52
Q

The gestational sac is approximately ____ mean sac diameter at ten weeks.

A

45mm

53
Q

hCG should double every _____ days

A

2-3 days

54
Q

Gestational sac and hCG peaks at _____ weeks

A

8-10

55
Q

1st trimester hCG is secreated by the _________ cells of the ________.

A

trophoblast, blastocyst

56
Q

Transvaginal transducers are _____ MHz

A

5 to 8

57
Q

Intrauterine pregnancy usually measures ___ at _____ weeks.

A

1cm, 5.5 weeks

58
Q

normal sac grows ____ per day in first trimester

A

1mm

59
Q

Gestational sac has a decidual wall thickness greater than ____.

A

3mm

60
Q

Endovaginal at _____ weeks gestation and transabdominal at ___ weeks.

A

4.5, 5

61
Q

failure to visualize the yolk sac, with a minimum of _____ MSD, using transvaginal sonography, should provoke suspicions of abnormal pregnancy.

A

12mm

62
Q

The normal diameter of the yolk sac should not exceed ____.

A

6mm

63
Q

The early embryo is often not identified until hear motion is detected at approximately ______, when the CRL is _____.

A

5.5, 2-3mm

64
Q

The anechoic center of 5-6 week gestational sac represents the _______.

A

chorionic cavity

65
Q

by week ____, three primary vesicles are seen within the feta brain: the prosencephalon, mesencephalon, and rhombencephalon.

A

8

66
Q

The mid-gut herniation occurs and is normally seen between _____ weeks. Normally returns into the abdomen by ___ weeks.

A

8-12, 12

67
Q

The embryonic heart starts beating at approximately ___ days (______ weeks). By the end of the ____ week of gestation, the has has reached its adult configuration.

A

35days, 5 to 5.5 weeks, 8th

68
Q

Rates of ____ to ____ beats per minute at 6 weeks increases to rates of ____ to ____ beats at 9 weeks, with rates of approxmatly ____ beats the remainder of the the late first and second trimester.

A

90-115, 140-160, 140

69
Q

As a rule, the gestational sac size remains accurate through the first ____ weeks of gestation.

A

8

70
Q

Crown-Rump length is most accurate dating parameters for gestation dating. Deviations of plus or minus _____ days.

A

5 to 7

71
Q

CRL measurements can be obtained as early as ____ weeks using transvaginal scanning. visualization of heart motion is a marker signifying the beginning of CRL measurements.

A

5.5

72
Q

CRLs are considered the most accurate method for dating through ______ gestation.

A

12 week

OBSTETRICAL DMS 114 (21 decks)

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