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CPAP EXAM 3 QUESTIONS AND 100% CORRECT ANSWERS
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CPAP EXAM 3 QUESTIONS AND 100% CORRECT ANSWERSwhat is daltons law?
the total pressure of a gas mixture is equal to the sum of the pressure that each gas
would exert independently
what does DLCO measure?
measures the transfer of a diffusion-limited gas (CO) across the A-C (or alveolar
capillary) membranes.
what is CBABE?
Cystic fibrosis
Bronchitis
Asthma
Bronchiectasis
Emphysema
what 4 gases make up the atmosphere?
nitrogen
oxygen
carbon dioxide
other trace gases
what percent does each gas make up for the atmosphere?
nitrogen: 78%
oxygen: 21%
carbon dioxide: 0.03%
other trace gases: 1%
what does Fick's law state?
that the rate of diffusion through a tissue such as the respiratory membrane is
proportional to the surface area and the difference in the parietal pressure of gas
,between the two side of the tissue.
what is the atmospheric pressure at 1 ATM?
760 mmHg
what AC membrane affects diffusion?
increased cardiac output, alveolar thickening
what is charles law?
If pressure is constant. volume varies directly with temp
V1TI=V2T2
what is definition of diffusion limited?
movement of gas across alveolar wall function of characteristics of AC membrane itself
what is definition of perfusion limited?
transfer of gas across alveolar wall is function of amount of blood that flows past alveoli
what is major limited factor O2 transfer rate?
perfusion
under what circumstance would patients with thickened AC membrane reveal evidence
of O2 diffusion impairment?
during exercise
how many more times is CO2 soluble than O2?
20-25 times
what is henry's law?
the solubility of a gas in a liquid is directly proportional to the partial pressure of that
gas on the surface of the liquid
what is solubility?
the ability of a substance to dissolve
what is the formula for alveolar air?
PaO2= [Pb-PH2O] FIO2-PaCO2(1.25)
does altitude affect your FIO2?
no. only the pressure changes
, what in the minimum tidal volume/dead space amount to wean someone off a ventilator?
tidal volume= 5-8 mL/kg
dead space= 25 mL/cmH2O
how do you find FEV 1 percent?
FEV/FVC x 100
what PFT measurements are indicant of obstruction impairment?
obstructive patients have low expiratory flowrates and increased lung volumes
how long does is take to exhale 100% FVC?
less than 3 seconds
what pulmonary diseases are obstructive?
Cystic fibrosis
Bronchitis
Asthma
Bronchiectasis
Emphysema
what pulmonary diseases are restrictive?
asbestosis, sarcoidosis and pulmonary fibrosis
what factors influence pulmonary the least?
weight
if you 2 patients of the same gender, what is the most imporatant factor that affects
PFT?
height
when measuring tidal volume, what do you base it off of?
height
what is MIP?
max inspiratory pressure
what is CL?
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