A simple index for uneven ventilation. With use of a closed-circuit system.
D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000503:physiopathology*; D012119:Respiration / Q000502:physiology*; D013147:Spirometry