,Prenatal circulation - ANS--Oxygenation occurs in placenta
-travels down ubliical arteries and enters ductus venosus--> enters RA--> oxygenated blood mixes with
deoxygenated and travel through foramen ovale--> blood enter LA through foramen ovale--> blood
travels to LV then through ductus arteriosus
Pulmonary vascular resistance = ________ in prenatal circulation - ANS-HIGH (lack of lung perfusion)
Systemic vascular resistance = _________ in prenatal circulation - ANS-LOW (placenta holding most
blood volume)
Postnatal Circulation - ANS--Oxygenation occurs in lungs
-Pulmonary vascular resistance DEC due to presence of O2
-systemic resistance INC due to removal of placenta
-Ductus arteriosus closes in first 24-48hrs
Why is it important to screen for congenital heart defects - ANS-Early detection can DEC infant
morbidity/mortality
Procedure of congenital heart defect screening - ANS-*done when baby >24hrs or shortly before
discharge
1. place pulse ox reader on right hand and either foot
2. monitor pre and post ductal sites for 5min
3. record findings
CHD screening results - ANS--<90% sat in right hand or foot = FAIL
-90-95% in hand/foot OR >3% difference btw hand/foot = REPEAT
->95% in hand/foot or <3% difference = PASS
**Screen repeated 3x... IF fail or repeat occurs after 3rd time: further eval needed
Desc: Abnormal connection btw 2 sides of heart (septum or great vessels)
CM CCHD: INC pulmonary blood flow - ANS--"Pink" babies
-dyspnea
-tachypnea
-crackles
murmur
-failure to thrive
-lethargy
Example/Description CCHD: Obstructive Blood flow from ventricles - ANS-Ex. Coarctation of Aorta
Desc: Constricted segment of aorta obstructs blood supply
CM CCHD: Obstruction of blood flow from ventricles - ANS--diminishes pulses (lower extremities)
-Poor coloring
-Delayed cap refill
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