Question 1

A restrictive defect is present when lung volumes are reduced to less than what percentage of predicted levels?

Accepted Answer

Restrictive disease is present if the lung volume is below normal (<80% predicted, or smaller than 1 standard deviation [SD] below the mean).

Question 2

Which of the following conditions is associated with a low FVC, low FEV₁ but normal FEV₁/FVC, small TLC, low DLCO, and no response to a bronchodilator?

Accepted Answer

Pulmonary fibrosis usually is associated with a low FVC, low FEV₁ but normal FEV₁/FVC, small TLC, and low DLCO, and no response to a bronchodilator.

Question 3

Which of the following tests would be used to determine at what point oxygen consumption reaches its peak?

Accepted Answer

Maximal oxygen uptake is designed to identify the level of exercise that causes the patient to reach maximum oxygen consumption.

Question 4

Which of the following medications is used most commonly during bronchoprovocation testing?

Accepted Answer

Inhaled histamine or methacholine is used most commonly to challenge the patient.

Question 5

Which of the following conditions are not common causes of restrictive lung disease?

Accepted Answer

This category of disease includes chest wall dysfunction, neurologic disease resulting in paralysis of the muscles of inspiration, dysfunction of the diaphragm, absent lung tissue, interstitial lung disease, atelectasis, and obesity.

Question 6

When bronchoprovocation testing is used, the FEV₁ needs to decrease by what percentage before a diagnosis of hyperactive airways is made?

Accepted Answer

A 20% decrease in the FEV₁ indicates that the patient has reactive airways.

Question 7

Which of the following tests would be used to determine at what point oxygen demand exceeds oxygen consumption during hard exercise?

Accepted Answer

Anaerobic threshold: When the body is stressed by exercise, there is a point at which the oxygen need exceeds availability, and a backup mode of metabolism called anaerobic (without oxygen) metabolism is brought into action. Exercise testing is useful for identifying this point for athletes in training and for patients with heart disease who may need an individualized exercise program that is safe for them. Proper exercise training will increase the anaerobic threshold.

Question 8

Obstructive lung disorders are characterized by a reduction in:

Accepted Answer

Obstructive disease is present if expiratory flow is below normal (<80% predicted).

Quiz 9: Pulmonary Function Testing