- Exclusion of other respiratory pathologies, based on anamnesis, computed tomography (absence of extensive emphysema lesions defined by the presence of less than <5% relative surface area occupied by densities less than 910 UH (measured on millimeter cuts)) and respiratory function tests (Residual Volume <120%, Diffusion Capacity for Carbon Monoxide > 60% and Total Pulmonary Capacity> 120%) and transthoracic ultrasound (normal),