Spirometry

Question 1

Forced Vital Capacity(FVC)

Answer 1

measures the largest amount of air that can be expired after maximal inhalation.

Question 2

Forced Expiratory Volume in 1s(FEV1)

Answer 2

Fraction of VC expired during the first second of maximal expiration

Question 3

FEV1/FVC ratios

Answer 3

Normal Lung = > 80% (80-120%)
Obstructive lung = < 70%, FEV1 = < 75% predicted
Restrictive lung = >70% FEV1%, TLC decreases, FVC < 80%, FEV1 < 80%

Question 4

Obstructive Lung Disease

Answer 4

FEV1% < 70%, FEV1 < 80%, FVC can be normal or < 80%, (Obstructive pts will have decrease flows)

Question 5

Restrictive Lung Diseases

Answer 5

FEV1% >70%, FEV1 < 80% and FVC <80% or normal (restrictive pts have volume issues)

Question 6

RV and TLC volumes

Answer 6

Normal - 80-120%
Restrictive = <80%
Obstructive = > 120%

Question 7

RV/TLC ratio

Answer 7

> 35% = Acute Asthmatics, air trapping
<35% with increased TLC = COPD, chronic hyperinflation

Question 8

What is a Helium Dilution Test

Answer 8

closed circuit test used to measure alveolar volume

Question 9

What types of patients are not indicated for Nitrogen Washout Test

Answer 9

COPD pts because the test is administered with 100% Oxygen

Question 10

DLCO values

Answer 10

Normal = 80-120%
Abnormal = below 80%