Question 1

Question

A 58-year-old man with a history of chronic obstructive pulmonary disease is evaluated in the pulmonary function laboratory. The FEV1 is 1.1 L, the FVC is 2.9 L, and the TLC is 7.8 L (predicted 6.0 L). After administration of an inhaled bronchodilator, FEV1 increases to 1.3 L and FVC increases to 3.1 L. Which of the following best characterizes the physiological basis of his increased TLC?

Accepted Answer

Reduced elastic recoil of the lung parenchyma shifting the equilibrium volume outward

Answer

Increased chest wall recoil pressure at high lung volumes

Answer

Increased airway resistance causing dynamic hyperinflation only during forced exhalation

Answer

Reduced diaphragmatic strength limiting the ability to exhale to residual volume

Answer

Increased pulmonary compliance due to surfactant overproduction

Respiratory — MCQs

Respiratory — MCQs

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