week 10 nenonatal change Flashcards
what does the newborn baby initally respnd to after they are born?
cold air on their face, movieng and breathing
what happens with the first breaths?
reduction in pulmonary artier pressures
hydrostatic pressure from crying - liquid in lungs drained into surrounding tissue and drained by lymphatic system over the first few hours
lung liquid replaced by air in - blood oxygentated by lungs and ductus arteriosis closes a fe breaths 0
what happens to pulmonary and SVR as the baby continues to breath?
oxyens tension rises
pulmonary blood flow increases and pulmonary vascular resistance decreases
SVR increases as chord is clamped
what causes closure of ductus arteriosus?
rise in PaO2 causes smooth muscle contraction of ductus arteriosis which then closes
normally fully closed by one week
what are the functinal closures of the ductus arteriosos post birth?
20% 24 hours
82% by 48 hours
100% by 96 hours
how is closure of the ductus venosus facilitated? how long does this take and what happen after?
blood flow through the umbilical vein stops
most blood continues to divery with minimal flow to liver
1-3 hours post bith smooth muscle contracts ductus venosis and blood flow then proceeds noramally though liver portal vein
how is the foraman oval closed and why?
oxygenated blood from lungs and into atrium
correction in pressure gradient causes closure of foraman ovale
how long does it take for a newborn to achive an SPO2 to be above 90%?
7-10 minutestocameia
how will a health newborn react?
quiet and alert
large gazing eyes
reaction to surroundings
grasp and suck reflex
why are newborns at greater risk of hypthermia?
large surface area to body ratio decreased subcutaneous fat greater water retntion imature skin proorly delveoped metabolic mechanisms no shovering alterd skin blood flow highly sensitive to temp changes
what are the sources of heatloss in a newborn?
evaporation- amniotic fluid evaporating fro skin
conduction- newborn is naked and placed on cool surface
convection- exposed to coll surroundings
radiation- near cold obects without being actually incontact to them
what are the sings and symptoms of hypothermia in neonates?
purple hands/feet hypoglycemia transient hyperclycemia bradycardia tachyponea, restlessnes, resp distress hyposix, acidosis, decreased activity
how common is it to have a hyperthermic baby?
very rare- usually trying to keep warm
usually due to environmental factors
when do we suction a neonate?
only suctioning if obvious obstruction like blood or mecunoim - 10f or 12fg catheter mouth then nose
what is a normal average wieght of a neonate?
3.5 kg
