08.19 - PFTs (Freire) - Questions Flashcards Preview

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Flashcards in 08.19 - PFTs (Freire) - Questions Deck (27):
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

Bronchoprovocation with Methacholine is considered positive if

FEV1 decrease of 20%