Respiratory System · NEET PG Preparation Physiology
A 28-year-old male undergoes pulmonary function testing. His forced expiratory volume in one second (FEV1) is 80% of predicted, forced vital capacity…
Practice question from Respiratory System (NEET PG Preparation Physiology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-BABD46
A 28-year-old male undergoes pulmonary function testing. His forced expiratory volume in one second (FEV1) is 80% of predicted, forced vital capacity (FVC) is 82% of predicted, and the FEV1/FVC ratio is 0.82. Total lung capacity (TLC) is measured at 55% of predicted. These findings are most consistent with which of the following conditions?
- A.Chronic obstructive pulmonary disease (COPD)
- B.Idiopathic pulmonary fibrosisCorrect answer
- C.Asthma with air trapping
- D.Normal pulmonary function
Solution
The patient has a normal FEV1/FVC ratio (0.82) combined with a significantly reduced total lung capacity (TLC at 55% of predicted), which is the hallmark of a restrictive ventilatory defect, such as idiopathic pulmonary fibrosis. COPD and asthma are obstructive defects characterized by a low FEV1/FVC ratio.
More from Respiratory System
- During a maximal expiration, a subject reaches residual volume. At this point, the inward elastic recoil of the lungs and the outward elast…
- A healthy medical student is breathing air at sea level. If her arterial blood gas analysis shows PaO2 = 100 mmHg, PaCO2 = 40 mmHg, and her…
- Which of the following regional differences characterizes a normal upright lung at the level of the functional residual capacity (FRC)?
- A patient with severe metabolic acidosis develops compensatory hyperventilation (Kussmaul breathing). Which of the following changes is pri…
Practise more Physiology
Sign up free for adaptive practice on this chapter, with instant feedback and hints on every question.
Start practising freeFree to start · No credit card needed