26 Cardiac Flashcards

1
Q

what kind of shunt causes cyanosis?

A

right to left

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2
Q

children squat to do what to SVR in what kind of shunt?

A

increase SVR, decrease R to L shunt

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3
Q

what problems do you get for long term cyanosis from R to L shunt?

A

polycythemia, strokes, brain abscess, endocarditis

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4
Q

what is eisenmenger’s syndrome? what does it mean when you have it? is it irreversible?

A

shift from L to R shunt to R to L shunt. sign of increasing pulm vascular resistant (PVR) and pulmonary HTN. not irreversible.

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5
Q

what kind of shunt causes CHF?

A

L to R shunt

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6
Q

how do L to R shunts manifest? how about in children?

A

L to R shunt causes CHF. CHF manifests as failure to thrive, tachycardia, tachypnea, hepatomegaly. in children, hepatomegaly is first sign of CHF

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7
Q

what are the causes of L to R shunt?

A

VSD, ASD, PDA

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8
Q

what are the causes of R to L shunt?

A

tetraology of fallot

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9
Q

how to R to L shunts manifest?

A

cyanosis

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10
Q

what is ductus arteriosus?

A

connection between descending aorta and L PA; blood is shunted away from lungs in utero.

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11
Q

what is ductus venosum?

A

connection between portal vein and IVC; blood shunted away from liver in utero

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12
Q

how many umbilical arteries?

A

2

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13
Q

how many umbilical veins?

A

1

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14
Q

draw a diagram of fetal circulation.

A

http://cl.ly/T5ly

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15
Q

what is the most common heart defect?

A

VSD (ventricular septal defect)

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16
Q

what kind of shunt occurs in VSD?

A

L to R

17
Q

what percent of VSDs close spontaneously? by when?

A

usu by 6 mo, 80% close

18
Q

when do large VSDs cause symptoms? why?

A

after 4-6 weeks of life, b/c PVR dec then shunt inc

19
Q

do VSDs cause CHF or cyanosis?

A

CHF (tachypnea, tachycardia), and failure to thrive

20
Q

what is the rx for VSD causing CHF?

A

diuretics and digoxin

21
Q

what is the timing of repair for large VSDs and medium VSDs? what is the definition for large and medium?

A
large VSD (shunt >2.5): 1yo
medium (shunt 2-2.5): 5yo
22
Q

what is the most common reason for earlier repair of VSD?

A

failure to thrive

23
Q

what kind of shunt occurs in ASD?

A

L to R

24
Q

where are ASDs located? what percent of the time?

A
ostium secundum (most common, 80%), centrally located.  
ostium primum (or atrioventricular canal defects or endocardial cushion defects)
25
Q

what other problems occur with ASD in ostium primum?

A

can have MV and TV problems, frequent in down’s syndrome

26
Q

when are ASDs symptomatic? what are si/sx?

A

shunt >2. CHF (SOB, recurrent infections)

27
Q

what happens to pts with ASD in adulthood?

A

paradoxical emboli

28
Q

what is medical rx of ASD?

A

diuretics and digoxin

29
Q

what is the usual timing of repair for ASD?

A

1-2 yo.

if pt has canal defects, 3-4 months old

30
Q

what are the 4 parts of tetralogy of fallot?

A

VSD, pulmonic stenosis, overriding aorta, RV hypertrophy (mnemonic VORP)

31
Q

what kind of shunt is tetralogy of fallot?

A

R to L

32
Q

what is the most common congenital heart defect that results in cyanosis?

A

tetralogy of fallot

33
Q

what is the treatment for tetralogy of fallot?

A

beta blocker

34
Q

when do you repair tetralogy?

A

3-6 month old