pulmonary physiology

Question 1

what is the difference between vital capacity and tidal volume

Answer 1

the former is maximum inhation and exhalation, the latter is spontaneous

Question 2

normal FEV1/FVC ratio

Answer 2

75-80%

Question 3

what is a positive bronchodilator response

Answer 3

12% or 200 ml

Question 4

is room air hypoxemia or room air resting hypercapnea more indicative with perioperative morbidity

Answer 4

hypercapnea

Question 5

whats the bar for ppoFEV1 or ppoDLCO

Answer 5

40%

Question 6

name all parameters for high risk lung resection

Answer 6

ppoFEV1 <0.8 L or < 40%
FVC < 1.5 L or < 30%
FEV1/FVC ratio < 50%
resting pO2< 45 mmHg, resting pCO2 > 50 mmHg, ppoDLCO < 40% predicted, VO2max < 10 mL/kg/min.
Patients that are unable to climb 1 flight of stairs,
have a resting oxygen saturation of < 90%,
or desaturate > 4% during exercise oximetry