Question 1

What is the predicted normal forced vital capacity (FVC) for the average 20-year-old man?

Accepted Answer

The predicted normal forced vital capacity (FVC) for the average 20-year-old man is approximately 5.6 liters. This value can vary based on factors such as height, but 5.6 L is a commonly accepted average for young adult males.

Question 2

What is the predicted normal FEV₁ for the average 20-year-old man?

Accepted Answer

The predicted normal FEV₁ for a 20-year-old, 180-cm man approaches 4.70 L.

Question 3

How can you ensure reliability when measuring the expiratory reserve volume (ERV)?

Accepted Answer

Performing the maneuver twice and ensuring consistency before taking the best value helps in obtaining a reliable measurement by confirming that the results are reproducible and not due to random error or variability.

Question 4

You have just given your patient a 0.03 mg/ml dose of methacholine to assess for asthma. The subsequent forced vital capacity (FVC) shows no change. What should you do next?

Accepted Answer

Doubling the dose and repeating the FVC maneuver is the correct next step in a methacholine challenge test if the initial dose does not elicit a significant change in lung function. This test involves administering increasing doses of methacholine to assess airway hyperreactivity, a hallmark of asthma.

Question 5

What is the amount of gas that can be inhaled over and above that which is normally inhaled during quiet breathing?

Accepted Answer

The amount of gas that can be inhaled over and above that which is normally inhaled during quiet breathing is known as the inspiratory reserve volume (IRV). Functional residual capacity (FRC) is the volume of gas remaining in the lungs after a normal tidal volume expiration. Expiratory reserve volume (ERV) is the amount of gas that can be exhaled over and above that which is normally exhaled during quiet breathing. Vital capacity (VC) is the total volume of air that can be exhaled after maximal inspiration.

Question 6

What pulmonary function test presents the highest risk for fainting?

Accepted Answer

Maximum voluntary ventilation involves rapid, deep breathing for a short period of time, which can cause hyperventilation and lead to fainting in susceptible individuals. The other tests listed do not pose as great a risk for fainting.

Question 7

What is the minimum percent of the forced vital capacity that healthy people can exhale in the first 1 second?

Accepted Answer

Healthy people can usually exhale at least 70% of their forced vital capacity in the first 1 second, which is referred to as the forced expiratory volume in 1 second (FEV1). This value can be used to diagnose and monitor various respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Options A, B, and D have FEV1 values lower than the typical range for healthy individuals.

Question 8

You are examining the expiratory flow tracing during the patient's forced vital capacity (FVC) maneuver. At what point during the exhalation can you generally begin to see flow from the bronchioles?

Accepted Answer

Generally, flow from the bronchioles becomes visible beyond 50% of the FVC maneuver. This is because the larger airways (trachea, bronchi, and bronchioles) empty first before the smaller ones (respiratory bronchioles, alveolar ducts, and alveoli) begin to contribute to the exhalation.

Question 9

What is the most common lung volume measured during spirometry?

Accepted Answer

The most common lung volume measured during spirometry is the vital capacity, which is the maximum amount of air a person can exhale after taking a deep breath. This measurement provides important information about lung function and can help diagnose respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Tidal volume is the amount of air inhaled and exhaled during normal breathing, and expiratory reserve volume is the extra amount of air that can be exhaled forcefully after a normal exhalation. Total lung capacity is the maximum amount of air the lungs can hold, but it is not typically measured during spirometry.

Question 10

Which of the following techniques are used to measure residual volume?
I.helium dilution
II.body plethysmography
III.nitrogen washout
IV.flow-volume loops

Accepted Answer

Residual volume, which is the volume of air remaining in the lungs after a maximal exhalation, cannot be measured directly by spirometry. Techniques like helium dilution, body plethysmography, and nitrogen washout are used to measure lung volumes that cannot be directly measured, including the residual volume. Flow-volume loops are used to assess the pattern of air movement in and out of the lungs during forced breathing maneuvers but do not measure lung volumes such as the residual volume directly.

Question 11

What is the predicted normal for the peak expiratory flow (PEF) in the average man?

Accepted Answer

Typical normal values for the adult male: PEF is 9.5 L/sec.

Question 12

What is the minimum objective standard for the volume exhaled during the final 1 second of an acceptable forced vital capacity effort?

Accepted Answer

The minimum objective standard for the volume exhaled during the final 1 second of an acceptable forced vital capacity (FVC) effort is 0.025 L. This criterion helps ensure the test's accuracy and completeness.

Question 13

Which of the following volumes or capacities cannot be measured by simple spirometry?
I.	functional residual capacity (FRC)
II.	expiratory reserve volume (ERV)
III.	residual volume (RV)
IV.	inspiratory reserve volume (IRV)

Accepted Answer

Functional residual capacity (FRC) and residual volume (RV) cannot be measured by simple spirometry because they are the volumes of air remaining in the lungs after a maximal expiration. This requires additional measurements such as helium dilution or body plethysmography. Expiratory reserve volume (ERV) and inspiratory reserve volume (IRV) can be measured by simple spirometry.

Question 14

When evaluating a forced vital capacity maneuver post bronchodilator use to determine the reversibility of any airway obstruction, what percent increase in FEV₁ is needed to be able to say the treatment was effective?

Accepted Answer

Although improvements in other measurements of pulmonary function are sometimes used, reversibility is defined as a 15% or greater improvement in FEV₁.

Question 15

After a resting expiration, air still remains in the lungs. What is this volume called?

Accepted Answer

Functional residual capacity (FRC) is the volume of air remaining in the lungs after a normal, passive expiration. It includes the expiratory reserve volume and the residual volume.

Question 16

A patient has an expired minute ventilation of 14.2 L and a ventilatory rate of 25/min. What is the average V_T?

Accepted Answer

The average tidal volume (VT) can be calculated using the formula: VT = VE / RR, where VE is the expired minute ventilation (14.2 L or 14,200 ml) and RR is the respiratory rate (25/min). Thus, VT = 14,200 ml / 25 = 568 ml.

Question 17

What shape of the flow-volume loop is typical for the patient with a fixed upper airway obstruction?

Accepted Answer

A fixed upper airway obstruction will cause a plateau in the flow-volume loop, resulting in a box shape.

Question 18

Which of the following is equal to total lung capacity (TLC)?

Accepted Answer

Total Lung Capacity (TLC) is the sum of Vital Capacity (VC) and Residual Volume (RV). VC is composed of Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV). Therefore, TLC equals TV + IRV + ERV + RV, which matches the components listed in option A.

Question 19

Which of the following is a TRUE statement?

Accepted Answer

VC (Vital Capacity) is the total volume of air that can be exhaled after a maximal inhalation, which includes the Inspiratory Reserve Volume (IRV), the Tidal Volume (TV, which seems to be represented by the placeholder "V_T" in the options), and the Expiratory Reserve Volume (ERV).

Question 20

Which of the following statements is NOT true about the FEV₁ measurement?

Accepted Answer

The answer of Which of the following statements is NOT...

Quiz 19: Pulmonary Function Testing

What is the predicted normal forced vital capacity (FVC) for the average 20-year-old man?

What is the predicted normal FEV₁ for the average 20-year-old man?

How can you ensure reliability when measuring the expiratory reserve volume (ERV) ?

You have just given your patient a 0.03 mg/ml dose of methacholine to assess for asthma. The subsequent forced vital capacity (FVC) shows no change. What should you do next?

What is the amount of gas that can be inhaled over and above that which is normally inhaled during quiet breathing?

What pulmonary function test presents the highest risk for fainting?

What is the minimum percent of the forced vital capacity that healthy people can exhale in the first 1 second?

You are examining the expiratory flow tracing during the patient's forced vital capacity (FVC) maneuver. At what point during the exhalation can you generally begin to see flow from the bronchioles?

What is the most common lung volume measured during spirometry?

Which of the following techniques are used to measure residual volume? I.helium dilution II.body plethysmography III.nitrogen washout IV.flow-volume loops

What is the predicted normal for the peak expiratory flow (PEF) in the average man?

What is the minimum objective standard for the volume exhaled during the final 1 second of an acceptable forced vital capacity effort?

Which of the following volumes or capacities cannot be measured by simple spirometry? I. functional residual capacity (FRC) II. expiratory reserve volume (ERV) III. residual volume (RV) IV. inspiratory reserve volume (IRV)

When evaluating a forced vital capacity maneuver post bronchodilator use to determine the reversibility of any airway obstruction, what percent increase in FEV₁ is needed to be able to say the treatment was effective?

After a resting expiration, air still remains in the lungs. What is this volume called?

A patient has an expired minute ventilation of 14.2 L and a ventilatory rate of 25/min. What is the average V_T?

What shape of the flow-volume loop is typical for the patient with a fixed upper airway obstruction?

Which of the following is equal to total lung capacity (TLC) ?

Which of the following is a TRUE statement?

Which of the following statements is NOT true about the FEV₁ measurement?

Quiz 19: Pulmonary Function Testing

What is the predicted normal forced vital capacity (FVC) for the average 20-year-old man?

What is the predicted normal FEV1 for the average 20-year-old man?

How can you ensure reliability when measuring the expiratory reserve volume (ERV) ?

You have just given your patient a 0.03 mg/ml dose of methacholine to assess for asthma. The subsequent forced vital capacity (FVC) shows no change. What should you do next?

What is the amount of gas that can be inhaled over and above that which is normally inhaled during quiet breathing?

What pulmonary function test presents the highest risk for fainting?

What is the minimum percent of the forced vital capacity that healthy people can exhale in the first 1 second?

You are examining the expiratory flow tracing during the patient's forced vital capacity (FVC) maneuver. At what point during the exhalation can you generally begin to see flow from the bronchioles?

What is the most common lung volume measured during spirometry?

Which of the following techniques are used to measure residual volume? I.helium dilution II.body plethysmography III.nitrogen washout IV.flow-volume loops

What is the predicted normal for the peak expiratory flow (PEF) in the average man?

What is the minimum objective standard for the volume exhaled during the final 1 second of an acceptable forced vital capacity effort?

Which of the following volumes or capacities cannot be measured by simple spirometry? I. functional residual capacity (FRC) II. expiratory reserve volume (ERV) III. residual volume (RV) IV. inspiratory reserve volume (IRV)

When evaluating a forced vital capacity maneuver post bronchodilator use to determine the reversibility of any airway obstruction, what percent increase in FEV1 is needed to be able to say the treatment was effective?

After a resting expiration, air still remains in the lungs. What is this volume called?

A patient has an expired minute ventilation of 14.2 L and a ventilatory rate of 25/min. What is the average VT?

What shape of the flow-volume loop is typical for the patient with a fixed upper airway obstruction?

Which of the following is equal to total lung capacity (TLC) ?

Which of the following is a TRUE statement?

Which of the following statements is NOT true about the FEV1 measurement?

What is the predicted normal FEV₁ for the average 20-year-old man?

When evaluating a forced vital capacity maneuver post bronchodilator use to determine the reversibility of any airway obstruction, what percent increase in FEV₁ is needed to be able to say the treatment was effective?

A patient has an expired minute ventilation of 14.2 L and a ventilatory rate of 25/min. What is the average V_T?

Which of the following statements is NOT true about the FEV₁ measurement?