oxygen therapy Flashcards
oxygen from the atmosphere to the lungs
ventilation
oxygen from the alveoli to the pulm capillaries
diffusion
incr temp, incr 2-3DPG, incr H+ shift the oxyhgb dissociation curve______
right
alkalosis shifts bohr curve?
left
hypoxemia in adults is defined as?
under 60 mmHg
impaired ability for tissue to utilize O2
dysoxia
what is an example of dysoxia?
cyanide poisoning
if ventilation >blood flow, what happens to V/Q ratio?
high V/Q (>1)
if blood flow >ventilation, what happens to V/Q ratio?
low V/Q
can you use O2 therapy to tx anatomic shunt?
NO
when Blood flow that does not participate in gas exchange
anatomic shunt
what type of shunt: areas of poor ventilation
alveolar shunts
hypoxia will lead to pulmonary _____ and pulmonary hyper or hypotension?
will lead to pulmonary vasoconstriction and pulmonary HTN
hypoxemia in neonates is defined as?
under 50
what is thought to be the cause of oxygen toxicity?
oxygen free radicals
excessive blood-oxygen produce retinal vasoconstrcition can lead to ?
necrosis of blood vessels in premies–>retinopathy
what component of room air keeps the alveoli open?
nitrogen
what is absorption atelectasis?
when inspired O2 is >50%, nitrogen depleted–>no alveolar repletion
normal blood gas
80-100 mmHg
disadvantage of nasal catheter
can get air in stomach - gastric distension
who is the venturi mask often used on
ppl with COPD who cannot tolerate nasal cannula and have SOB
what do you used for patients w/ tracheostomy?
aerosol masks
