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Flashcards in PFTs Deck (32)
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1

Introduction:

there are 2 types of ventilatory d/o.. what are they?

Restrictive

Obstructive

2

Introduction:

Preanesthestic identification and treatment of reversiable ventilatory defects are essential to improve outcomes. What si teh easist amenable to treat? what type is generally difficult to reverse and treat?

Easy - COPD

Difficult - restrictive d/o

3

Introduction:

it is desireable to perform spirometry on all pts w/ unexplained dyspnea ad in those whom COPD is suspected. A (increase or decrease) in FEV1/FVC is characteristic of obstruction dz

Decrease

4

Introduction:

what does spirometry help do?

distinguish restrictive ventilatory defects from obstructive ventilatory defects

5

Introduction:

what provides an alternative method for assesing Pulmonary function?

Flow-volume loops

6

Introduction:

what are 2 advantages of flow-volume loops over spirometry?

early detection of COPD

differentiate anatomic location of obstruction

7

Spirometry:

what 5 Lung volumes and capacities are obtained form Spirometric recording?

TIdal Volume (TV)

Vital Capacity (VC)

Inspiratory capacity (IC)

Inspiratory reserve volume (IRV)

Expiratory reserve volume (ERV)

 

 

 

8

Spirometry:

what 3 lung volumes are not directly obtainable 

FRC

Residual Volume (RV)

Total lung capacity (TLC)

9

what are 3 ways to measure FRC

helium Dilution

Nitrogen washout

Body Plethysmography

10

Spirometry: Static

Label this

Draw this out for boards

 

11

Spirometry: Static

what makes up FRC

ERV + RV

12

Spirometry: Static

what makes up inspiratory capacity (IC)

Tv + IRV

13

Spirometry: Static

what makes up VC

ERV + IC 

14

What does the following stand for:

FEV1

Forced Expiratory Volume in 1 sec

this is the volume of gas that can be exhaled within 1 sec of begining forced expiration

15

What does the following stand for:

FVC

Forced Vital Capacity

this is the volume of gas that can be exhaled during a forced expiratory maneuver

16

What does the following stand for:

FEV1 / FVC

ratio used to distinguish between restricive and obstructive disease

17

What does the following stand for:

FEF 25-75

forced expiratory flow from the point where 25% of the FVC has been exhaled to the point where 75% FVC has been exhaled. 

 

18

the FEF 25-75 is best for assessing what?

small airway disease

19

Obstructive Disease:

what are 4 types

Asthma

COPD

Chronic Bronchitis (blue Bloater)

Emphysema (pink puffer)

20

Restrictive Disease:

what are 4 examples

Pulmonary fibrosis

Pneumothorax

Chest wall dz (scoliosis)

NM disease (ALS, MG)

21

FEV1/FVC ratio:

what is normal value?

> 0.7

22

FEV1/FVC ratio:

normal picture

 

23

FEV1/FVC ratio:

how is Obstructive Dz diagnosed?

if both FEV1 and FVC are low and the Ratio is

24

FEV1/FVC ratio:

how is restrictive Dz diagnosed

if both FEV1 and FVC are low and the ratio is >0.7

25

FEV1/FVC ratio:

a comparison of all 3

 

26

What is normal FEV1

 

4L

(think of V/Q 4/5)

27

what is normal FVC

5L.min

thik of V/Q

4/5

28

FEV1/FVC ratio: Problems state is restrictive or obstructive dz

FEV1 = 3.6

FVC = 4.8

0.75 

Normal

29

FEV1/FVC ratio: Problems state is restrictive or obstructive dz

FEV1 = 1.8

FVC= 2.2

0.81

Restrictive

30

FEV1/FVC ratio: Problems state is restrictive or obstructive dz

FEV1 = 2.2

FVC = 4.8

0.45

obstructive

31

Flow Loop:

where is inspiration on the graph?

lower half

32

Flow Loops:

Where is Expiration of the graph

Top half

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