Spirometry Flashcards
1
Q
Converting from ATPS to BTPS
A
Measure the value in ATPS then select the next higher answer for BTPS
2
Q
Typical VC
A
4.8L
3
Q
Typical Vt
A
500mL
4
Q
Typical IRV
A
3.1L
5
Q
Typical ERV
A
1.2L
6
Q
Typical IC
A
3.6L
7
Q
Static lung volumes
A
TLC, FRC, RV
8
Q
Typical PEFR
A
10L/sec or 600L/min
9
Q
Typical FEF 200-1200
A
6L/sec
Airflow through large airways
10
Q
Typical FEF 25-75
A
4-5L/sec
11
Q
Minimum acceptable FEV1/FVC
A
70%
12
Q
Minimum acceptable FEV3/FVC
A
97%
13
Q
Typical MVV
A
170L/min
Or FEV1 x 35
14
Q
FEF50:FIF50 ratio
A
Normal = 0.8-1.2
Variable ET obst. = increased
Variable IT obst. = decreased
Fixed obst. = normal
15
Q
Disease severity by % pred.
A
70-80% mild
60-70% moderate
50-60% moderate/severe
35-50% severe
<35% very severe
16
Q
“Usable” spirometry efforts for pediatric patients
A
Good peak and free from
artifacts for the first second of exhalation
