Respiration Flashcards
What is respiration?
diffusion of gas across the alveolar-capillary membrane
What is typical PaO2 on room air in a healthy person?
95-100mmHg
- mild hypoxemia = <90mmHg
What is FiO2?
percentage of oxygen in air, based on total of 1.0
- typical room air = .21 (aka 21%)
At what mmHg does oxygen dissociate more quickly from hemoglobin? What SpO2 does this correspond to?
- Why is this important to know?
- 55-60mmHg PaO2
- corresponds to SpO2 of 88-90%
important b/c supplemental O2 should be considered at this point
What is the ability to remove carbon dioxide from the pulmonary circulation and maintain pH called?
alveolar ventilation
What is the normal pH range in the body?
7.35 - 7.45
T/F: Increasing PaCO2 in the body (via retention) decreases the body’s pH.
true (inverse relationship)
What levels of PaC02 indicate hypercapnia? What about hypocapnia?
normal = 35-45mmHg CO2
hypercapnia = >45 hypocapnia = <35
T/F: Increase in bicarbonate causes an increase in pH.
true
- bicarb = HCO3-
What’s the difference between ventilation and perfusion?
ventilation = gas in alveoli perfusion = amount of blood passing by alveoli (that can either pick up O2 from alveoli or drop off CO2)
What is perfusion?
blood getting to lungs to receive O2 (bringing CO2 to lungs as deoxy blood)
What needs to occur for optimal respiration, in terms of ventilation and perfusion?
ventilation and perfusion rates need to match
- ventilation = gas available in alveoli
- perfusion = blood getting to lungs/alveoli
What is respiration?
gas exchange
What does a high V/Q ratio indicate?
dead space
One of your peds patients manages to inhale a peanut when eating as a reward for an exercise; what occurs to their ventilation?
decreases, since no air is getting into alveoli
