Intrapulmonary pressure >Inspiratory phase:<1 atm >Expiratory phase:>1 atm >At the end of inspiration or expiration:=1 atm Intrapleural pressure >Concept Changes during respiratory cycle More negative as inspiratory processing Less negative as expiratory processing >Measurement Expression Direct Indirect measurement 775 mmHg or-5 mmHg Always 1 atm under static conditionIntrapulmonary pressure ➢Inspiratory phase: <1 atm ➢Expiratory phase: >1 atm ➢At the end of inspiration or expiration: =1 atm Intrapleural pressure ➢Concept & Changes during respiratory cycle More negative as inspiratory processing Less negative as expiratory processing ➢Measurement & Expression Direct & Indirect measurement 775 mmHg or −5 mmHg Always < 1 atm under static condition