PFT & ABG Flashcards
What is the normal mechanism for breathing?
Chemoreceptors>medulla (PaCO2 and PaO2)>resp muscles contract>thorax expands and diaphragm contracts>transpulmonary pressure gradient change>air moves from AW to alveoli
What is the norm PaO2 for O2 in alveoli to diffuse into blood?
80-100 torr
What is the norm PaCO2 in blood to diffuse into alveoli?
35-45 torr
What is lung vol and capacitY?
-measure of AW and lung RESTRICTION
2+ vol= capacity
What is tidal volume? (VT)
How much you breath in and out during a breath
500 mL
What is insp reserve volume? IRV
Vol above normal inhalation
3.0L
What is exp reserve vol (ERV)?
Addl vol exhaled after normal exhalation
1.2 L
What is residual vol (RV)
Vol remaining in lungs after complete exh 1.2 L
TLC
IRV+VT+ERV+RV= 5 L
VC
IRV+VT+ERV= 4.8L
IC
IRV + VT= 3.5 L
FRC
2.4L how much is left in lungs to prevent from collapsing
What are examples of RD
Obesity
NM
CT disease
Occupational exposure
What is flow
Primary measure of AW OBSTUCTION
Flow= vol/time
PEFR
Peak expiratory flow rate
Good for asthma
If dropping=pt will get asthma attack
% of FEV exhaled in 1 sec
FEV1= 75-80% (blow as much air out in 1 sec)