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. 2019 Jun 10;16(7):967–980. doi: 10.7150/ijms.32752

Figure 2.

Figure 2

Causes of chronic respiratory failure in interstitial lung diseases and when to suspect them. Footnotes: CAD: coronary artery disease; COPD: chronic obstructive pulmonary disease; CTD: connective tissue disease; CRF: chronic respiratory failure; DLCO: diffusing lung capacity for carbon monoxide; FVC: forced vital capacity; HRCT: high resolution computed tomography; ILD: interstitial lung disease; LES: Systemic lupus erythematosus; PE: pulmonary embolism; PFTs: pulmonary function tests; PH: pulmonary hypertension; TLC: total lung capacity.