A 72-year-old man has 1 year of progressive breathlessness and dry cough. PFT: FEV₁ 71%, FVC 69%, FEV₁/FVC 79%, TLC 64%, RV 54%, DLCO 54%. What is the most likely diagnosis?
سؤال مجاني 6 من 10 اليوم · اشترك وكمّل بدون حد
اعرض الإجابة
الإجابة والشرح
ادخل لحسابك عشان نحفظ إجاباتك ونوريك أخطاءك.
الإجابة: C. Intrapulmonary interstitial lung disease
FEV₁/FVC is preserved (79%) with low TLC (64%) → restrictive pattern, which excludes COPD (obstructive, low ratio). The reduced DLCO (54%) places the problem in the lung parenchyma: ILD thickens the alveolar membrane and lowers diffusion. Extrapulmonary restriction (neuromuscular, chest wall, obesity) is extrinsic to the lung and keeps a normal DLCO.
ليش كل خيار صح أو غلط
-
A
ليش غلط
COPD gives an obstructive pattern with a decreased FEV1/FVC ratio. His ratio is preserved (79%) with reduced FEV1 and FVC, which is the restrictive pattern described on the same page.
✓ Step Up To Medicine 6th Edition 2024 (COPD).pdf · p. 6 -
B
ليش غلط
Extrapulmonary restriction (neuromuscular disease, chest wall deformity, obesity) is extrinsic to the lung and keeps a normal DLCO. His DLCO is reduced (54%), so the lung itself is diseased.
✓ Step Up To Medicine 6th Edition 2024 (COPD).pdf · p. 6 -
C
ليش صح
ILD thickens the respiratory membrane, so gas diffusion falls and DLCO is low. His DLCO is reduced (54%), which fits disease inside the lung such as ILD.
✓ 6• Pulmonary Function Tests [Notes].pdf · p. 3
- المصدر
- 6• Pulmonary Function Tests [Notes].pdf · p. 3
Step Up To Medicine 6th Edition 2024 (COPD).pdf · p. 6 - المحاضرة
- Other Lung Diseases (ILD, Bronchiectasis, Lung Cancer) · Infectious Diseases · Module B
- ظهر في
- MED42 ♂ EOM B