paeds Flashcards
(754 cards)
what are the three fetal shunts
ductus venosus, foramen ovale, and ductus arteriosus
ductus venousus shunts
from the umbilical vein to the IVC to bypass the liver
foramen ovale shunts
right atrium to left atrium to bypass right ventricle and pulmonary circulation
ductus arteriosus shunts
the pulmonary artery with the aorta to bypass pulmonary circulation
why does the foramen ovale close?
first breath expands alveoli decreasing pulmonary vascular resistance causes pressure to fall in the right atrium which squashes the atrial septum.
foramen ovale after shutting gradually becomes the
fossa ovalis
what is required to keep the ductus arteriosus open?
prostaglandins
why does the ductus arteriosus close after first breath
increased blood oxygen decreases circulating prostaglandins
after closing the ductus arteriosus forms
ligamentum arteriosum
ductus venosus closes because
of umbilical cord clamping
ductus venosus becomes
ligamentum venosum
innocent murmurs are
systolic flow murmurs
features of an innocent murmur are
soft, short, systolic, asymptomatic, and situation dependent.
red flags for a murmur are
loud, diastolic, louder on standing or systemic features.
investigations for murmurs are
ECG, CXR and echo
pan systolic murmur examples are
mitral regurgitation, tricuspid regurgitation, and ventricular septal defects
ventricular septal defects are heard at the
lower left sternal border
ejection systolic murmurs examples
aortic stenosis, pulmonary stenosis and hypertrophic obstructive cardiomyopathy
hypertrophic obstructive cardiomyopathy is heard at
fourth intercostal space on the left sternal border
negative thoracic breathing during inspiration causes
physiological splitting of the heart sound
atrial septal defect murmur
mid systolic crescendo decrecscendo murmur with a fixed split second heart sound
patent ductus arteriosus murmur
continous crescendo-decrescendo machinery murmur
tetralogy of fallot murmur
ejection systolic murmur due to pulmonary stenosis
cyanotic heart disease pathology
deoxygenated blood in systemic circulation. occurs with a right to left shunt.