pft lec 1

Question 1

measures ability of lungs to permit transfer of an alveolar gas along the alveolar-capillary membrane to combine with hemoglobin

Answer 1

pulmonary diffusion test

Question 2

quantity of specific gas that can diffuse the alveolar-capillary pathway in response to a pressure gradient

Answer 2

diffusing capacity

Question 3

rate of transfer of a gas through a sheet of tissue is proportional to the tissue area and the difference in gas partial pressure between two sides and inversely proportional to tissue thickness

Answer 3

Fick’s law

Question 4

a human lung has this much alveoli

Answer 4

300 million

Question 5

the measurement of the surface area of lung

Answer 5

75 m2

Question 6

the distance between the blood and air within alveoli

Answer 6

0.7 micrometers

Question 7

partial pressure of oxygen in the alveoli

Answer 7

100 mmHg

Question 8

partial pressure of oxygen in the capillary

Answer 8

40 mmHg

Question 9

the normal amount of a diffusing capacity

Answer 9

20 mL/min mmHg

Question 10

the other factor that may affect the diffusing capacity

Answer 10

ventilation / perfusion relationships

Question 11

the most common method ; based on diffusion decay curve described by Forster

Answer 11

single breath / modified Krogh

Question 12

high intrathoracic

Answer 12

Valsalva maneuver

Question 13

low intrathoracic

Answer 13

Muller maneuver

Question 14

a method that allows measurement with the patient performing normal tidal breathing

Answer 14

steady state / Filey

Question 15

a method that also allows normal tidal breathing ; has two rebreathing techniques

Answer 15

DLCO rebreathing

Question 16

a rebreathing technique and a sample from the reservoir is taken for measurement of carbon dioxide, helium, and oxygen concentrations

Answer 16

reservoir sampling

Question 17

a rebreathing technique wherein rebreathing continues until a gas concentration equilibrium is reached between reservoir and patient’s lungs

Answer 17

wash out - sampling