…over 40 years of age, atherosclerosis is the predominant cause. Other mechanisms include thrombosis, embolism, vasculitis, fibromuscular dysplasia, arterial entrapment, cystic adventitial disease and trauma…

…neuromuscular disease, marked chest wall deformity, severe bronchiectasis and cystic fibrosis. Here a lower target range and controlled delivery apply — not the withholding of oxygen…