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Embryology (clinical Anatomy) > Incidences > Flashcards

Incidences Flashcards

1
Q

What is the incidence of dizygotic twins?

A

1/80 pregnancies and accounts for 90% of twinning

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2
Q

What is the incidence of monozygotic?

A

3/1000 pregnancies

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3
Q

What is the incidence of triplets?

A

Non: 1/1000
identical: 1/10,000

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4
Q

What is the incidence of conjoined twinning

A

1/250,000 live births

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5
Q

What is the incidence and pattern of inheritence in Robin sequence in robin sequence?

A

1/8500

Autosomal dominant

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6
Q

What % of treacher-collins is caused by new mutations?

A

60%

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7
Q

What is the incidence of cleft lip ± palate?

A

1/700-1000

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8
Q

what % of newborns are born w/ a major and minor anomaly?

A

3% - major

15% - minor

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9
Q

What are the %’s of the 3 causes of T21?

A

95%: non-dysjunction (M1 most between homologous chromosomes and M2 less common between sister chromatids)
4% unbalanced translocation
1% mosaicism

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10
Q

How many pregnancies are ectopic?

A

2%

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11
Q

What do 20% of people w/ situs inversus have?

A

Kartanger’s syndrome

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12
Q

What is the percentage of false +ves in combined test?

What is its detection rate?

A

5%

80%

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13
Q

What are the risks of miscarriage CVS and amniocentesis?

A

CVS: 1-2%

Amnio: 0.5-1%

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14
Q

how many spina bifida pts have hydrocephalus?

A

15%

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15
Q

What are the percentages of the different types of membranes in MONOZYGOTIC twins?

A

Dichorionic diamnotic: 25-30%
Monochorionic diamniotic: 70-75%
Monochorionic monoamniotic: 1-2%

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16
Q

What are the percentages of the different types of membranes in DIZYGOTIC twins?

A

Dichorionic diamnotic: 58%

Monochorionic diamniotic: 42%

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17
Q

What % does TTTS + TRAP occur in monochorionic twinning?

A

TTTS (10-15%)

TRAP (1%)

18
Q

What is the incidence of Edward’s syndrome?

A

1/5000 live births

19
Q

What is the incidence of patau’s (T13)?

A

1/20,000 live births

20
Q

What is the incidence of prader-willi syndrome?

A

1/15,000

21
Q

what is the incidence of kleinfelter’s syndrome?

A

1/500

22
Q

What % of couples are infertile?

A

15% (90% subfertile)

23
Q

What is the incidence of endometriosis?

A

1/10

24
Q

what is the incidence of ASDs? Do they occur equally in males and females?

A
  1. 4/10,000 births

2: 1 F:M

25
Q

What is the incidence of VSD?

A

12/10,000 (commonest CHD)

26
Q

What is the incidence of TOF?

A

9.6/10,000 births

27
Q

What is the detection rate of anencephaly + myelomeningocele on the fetal anomaly scan?

A

90%

28
Q

what % of NTDs are prevented by folic acid supplimentation?

A

50-70%

29
Q

What is the incidence of limb defects? Are upper or lower limbs more affected?

A

6/10,000 live births

upper>lower

30
Q

What is the incidence of oesophageal atresia?

A

1/2500-4000 births

31
Q

What is the incidence of omphalocele?

A

2.5/10,000 births

32
Q

What is the prognosis of omphalocele?

A

25% mortality rate

33
Q

What is the incidence of gastroschisis?

A

2-3/10,000 births

34
Q

What is the incidence of pre-eclampsia?

A

5% (1/20 pregnancies)

35
Q

What is the incidence of placenta previa?

A

0.5% (1/200 pregnancies)

36
Q

what is the incidence of hypospidiasis?

A

3-5/1000 births

37
Q

what is the incidence of epispidiasis?

A

1/30,000 births

38
Q

What is the incidence of cleft palate only?

A

1/1500-2500

39
Q

What is the incidence of placental abruption?

A

1/200

40
Q

what is the incidence of CLP?

A

1/700-1000

41
Q

What is the incidence of exencephaly?

A

1/5000

42
Q

What is incidence of horseshoe kidney?

A

1/600

Embryology (clinical Anatomy) (9 decks)

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