Flashcards in 08.19 - PFTs (Freire) - Questions Deck (27)
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1
Post-bronchodilator response is positive if
Incr in FEV1 of 200 cc (and 12%), or 15% from basal FEV1
2
The MVV Maneuver tests
Max respiration in L/min
3
How to perform MVV Maneuver
Deep breaths as hard and fast as possible for 12 seconds
4
Internal consistency check for MVV Maneuver
40 times FEV1
5
If both obstructive and restrictive have decr VC, how differentiate?
Obstructive defined by FEV1/FVC <70%
6
VC is reduced in (3)
Chest Pain; Fatigue; Poor Effort
7
TLC is reduced in (4)
Diseases of Thorax; Inspiratory Muscles; Pleural Dz; Loss of functioning alveoli
8
Hyperinflation and air trapping increases __ volume
Residual Volume
9
Dynamic Hyperinflation
Air Trapping and Hyperinflation become more profound as RR increases with exercise
10
__ corresponds more strongly to dyspnea than FEV1
IC
11
Real way that medication helps patients with COPD and Hyperinflation
Limits dynamic hyperinflation and air stacking.
12
Compliance in Asthma
Same as normal
13
Compliance in Emphysema
Increased
14
Compliance in Fibrosis
Decreased
15
What differentiates asthmatics form COPD in PFTs
Increased compliance in COPD
16
FEV1/FVC in Fibrosis
Very high --> Hyperflows
17
A normal SVC excludes
a significant restrictive disorder
18
Flow velocities are __ for each given instanteous volume in Restrictive
higher (>elastic recoil)
19
Which component of Expiration on Flow-Volume loop is effort-independent
Terminal portion --> Driven only by elastic recoil
20
Can dx central airway disorders by
Flow-Volume Loop
21
Inspiratory phase of flow-volume loops give the ___ component of central airways
Extra-Thoracic
22
If fixed obstruction is present, it will show on ___ and ____
inspiratory and expiratory portion of FV Loop
23
Co is used to measure DL b/c
it has high affinity for Hb; Found in low concentration in blood
24
Which method of DLCO is simple and standardized
Single Breath
25
DLCO with blood in lung
Higher than actual
26
DLCO in Pulmonary HTN
Higher than actual
27
