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10 Cards in this Set
- Front
- Back
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what vessel gives the fetus the most highly oxygenated blood?
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umbilical vein
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what conditions are necessary for clossure of Ductus Arteriosus at birth?
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normal pH and good oxygenation
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What happens if pulmonary vascular resistance does not drop at birth? (lack of aveolar and systemic O2 saturation)
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fetal circulation persists, and cyanosis develops
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why does it take 6 weeks to reach normal PVR levels?
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it takes time for the pulmonary arterioles to thin
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ASD
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since PVR is less than systemic resistance (and RV is more compliant than LV), blood will flow from L to R
after equalization, blood still flows from L to R (LV less compliant) Murmur heard in pulmonary area due to increased flow since pressures stay relatively low, may be assymptomatic til 30 recomendation: surgery or catheter therapy by elementary school |
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Patent Foramen Ovale
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normal: increase in RA pressure closes foramen
if not, valsalva or cough or pulmonary HTN could lead to paradoxical embolism |
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VSD- large
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L to R shunt
CHF surgical or catheter closure |
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VSD medium
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L to R shunt
assymptomatic for years; eventually causes pulmonary HTN due to Eisenmenger syn.(cyanotic) Eval all kids with systolic murmurs!! treat pulm. HTN, transplant, cant close VSD |
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patent ductus arteriosus
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prevalent in premature babies
large PDAs produce L to R shunt Eisenmenger death high risk of infection to fix indomethacin is usually successful to close; if not catheter therapies |
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what are the signs and symptoms of CHF in babies?
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tachypnea and hard breathing
poor feeding low weight tachycardia S3 hepatomegaly decreased pulses, cool extremities |
