title: To sigh or not to sigh.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001784:Blood Gas Analysis; D002245:Carbon Dioxide / Q000097:blood; D005260:Female; D006801:Humans; D008170:Lung Compliance; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D011175:Positive-Pressure Respiration; D011650:Pulmonary Alveoli; D001261:Pulmonary Atelectasis / Q000517:prevention & control; D012119:Respiration; D013147:Spirometry; D012122:Ventilators, Mechanical
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen