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Flashcards in Spirometry Deck (18):
1

fixed extrathoracic airway obstruction when

FEF50/FIF50 >1

2

at ___, inspiration/expiration flow rate should be about equal

50% VC

2

hallmark of restrictive defect

reduced total lung cpacity

3

significant response to bronchodilator

when FVC or FEV1 increases at least 12% and 200ml

4

low FEV1 FVC implies ___ process

obstructive

(restrictive and normal flow have not-low ratios)

5

normal range FEV1/FVC

normal VC

0.70-0.87

normal vc within 80% of predicted

6

if FEV1/FVC ratio low...

FEV1%  of expected classification

FEV1>99% expected = phyiologic variant

FEV1 70-99% mild

FEV1 60-69% moderate

FEV1 50-59 moderately severe

FEV1 34-49 severe

FEV1

6

restrictive lung disease

sarcoidosis, collagen vascular disease

pulmonary fibrosis

pneumonectomy

plearal effusion

chest wall disease (kyphosis, nm disorder)

extrathoracic conditions (obesity(

8

process of air into alveoli (pressure differentials)

thorax expands> pleural more sub-atm >

> increase transpul pressure >

>lungs expand>

>alveolar pressure = atm >

air flows into alveoli

9

in emphysema, lung tissue is ___ compliant

more

11

restrictive disease = ____ flow rate curve

normal shape, skinnnier (less volume)

12

___ outside of 95% Confidence interval is low

FEV1/FVC

13

TLC classifications for restrictive defect

% predicted TLC =70%-to LLN Mild

60-69% Moderate

(if lung volumes cannot be measured, grade FVC using the obstructive FEV1 classes)

14

satisfactory duration of exhalation for spirometry

6sec

15

cystic firosis, pulmonary parenchymal disease (emphysema) obstuctive or restrictive?

obstructive

16

function residual capacity =

vital capacity =

fxn residual vol + expiratory reserve volume

vital capacity = Inspiratory reserve+tidal+Exp reserve

17

obstructive disease determined by -__ airways

extrathoracic

18

transpul pressure = 

alveolar pressure - pleural pressure