Respiratory Fxn- Kline

5Q- based off pp

FEV1 stands for…

Forced expiratory volume in 1 sec

FVC stands for…

forced vital capacity or the max amount of air that can be exhaled during a forced expiration

By looking at the ratio of FEV1/FVC we can measure/ see what?

Basically, we can tell whether there is an OBSTRUCTION or not!

• Technical definition: measure of airway obstruction with or without restriction

What is a normal adult (>20) FEV1/FVC %?

80%

What FEV1/FVC % in adults SUGGESTS an obstruction?

<70-75%

In people <20 years old what FEV1/FVC percent suggests an obstruction?

≤85%

Practice:

If I had a 50-year-old patient with asthma (an obstructive disease), what would I expect their FEV1/FVC ratio to be?

a. 80%

b. 85%

c. 70%

d. 100%

c

What is a Pulmonary Function Test (PFT)?

FYI

used to evaluate physiological processes and measure abnormalities like obstructions, changes, decreases in gas exchange

What is the most commonly used PFT?

spirometry

What does a peak flow meter measure?

• measures how fast you can push air out of your lungs on forced exhale

• measures how open are the airways in the lungs

Obstructive lung disease is inability to get air ____ the lungs.

(into /out of)

OUT

Restrictive Lung disease is inability to get air ____ the lungs.

(into /out of)

INTO

What are some common obstructive lung disease?

• asthma

• COPD

  • emphysema

  • chronic bronchitis

What are some causes of restrictive lung diseases?

basically anything that makes it so the lung can’t expand

• Tip: I’m going to remember the obstructive diseases, so if I see a disease that’s doesn’t belong to obstructive, I’m gonna assume it’s restrictive

For Obstructive Lung Disease, what happens to the FEV1, FVC, and FEV1/FVC ratio?

FEV1= DECREASED

FVC= normal

FEV1/FVC ratio= decreased

For Restrictive Lung Disease, what happens to the FEV1/FVC ratio?

NORMAL/ Stays the same (75-80%)

What value is used to classify restrictive lung diseases instead of the FEV1/FVC ratio?

TLC (total lung capacity)

How is the TLC effected in restrictive lung diseases?

DECREASED

Mild restrictive lung disease is a TLC <____-____%

Mild restrictive lung disease is a TLC <70-80%

Moderate restrictive lung disease is a TLC <____-____%

Moderate restrictive lung disease is a TLC <61-69%

Severe restrictive lung disease is a TLC <___%

Severe restrictive lung disease is a TLC <60%

For DIAGNOSIS of obstructive lung disease the FEV1/FVC ratio must be less than ____%.

70%

Practice:

Which of the following would indicate a diagnosis of an “obstructive” patter in pulmonary function testing?

a. positive bronchodilator response

b. increased FEV1/FVC ratio

c. Decreased FEV1/FVC ratio

d. increased total lung capacity

c

Practice:

All of the following are causes of restrictive lung pattern in pulmonary function tests except which:

a. COPD

b. pulmonary fibrosis

c. pleural effusion

d. pulmonary edema

a- COPD is obstructive