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Flashcards in forced spirometry Deck (19):
1

measured volumes

FVC
FEV1

2

measured flow rates

peak expiatory flow
FEF-25-75% flow rate during the middle 50% of the FVC tracing
FEF200-1200 forced expiratory flow between 200 and 1200 ml

3

the spiromery is?

highly effort depended test and good instruction must be given

4

technical test

initial speed at 32 mm/min and patient breath comfortably and at the end of inspiration the patient signal and you turn on 1920 mm/min and patient exhales forcefully to and test stop when patient can no longer continue
may take up to 20 seconds for severely obstructed patients

5

end of test criteria

six second expiatory time
plate of 1 second at RV
patient cannot exhale further
minimal detectable volume change at rv less than 30ml

6

acceptability criteria

maximal effort with a smooth continue effort
no cough
back extrapolation ,150mL or 5% whichever greater

7

producibility criteria

three acceptable criteria
three acceptable test plus or minus 5% or 200 mL

8

best test

greatest sums of the FVC and FEV1

9

FEV1 should be

75-85% of the FVC in one second

10

fev2

should be 94% of FVC in 2 seconds

11

fev3

normal individual can exhale 94% of FVC in 3 seconds

12

in obstructive patient the FEV1/FVC

65% and in restrictive disease it maybe normal or increases

13

FEF25-75%

flow during the middle portion of FVC
sensitive to small airway obstruction

14

FEF200 and 1200

indicative of large airway obstruction
and flow is between 200 to 1200 on the FVC

15

Peak expiatory flow rate

steepest portion of the tracing,, usually near the upper most part of the FVC curve

16

obstructive disorder

patient can get the air in but can't get it out
example: bronchitis
emphysema
asthma

17

restrictive disorder

patient can't get the air in
sarcoidosis
pleural effusion fibrosis
obesity

18

in obstructive disease

fvc, fev1 fef200-1200,-reduced or normal
fef25-75 -decreases
fev1/fvc-increased

19

in restrictive disease

fvc, fev1,fev1/fvc%- decreased
fef200-1200 - normal
fef25-75 normal or decreased