_{A/C
assist-control ventilation}

_{AEP
acute eosinophilic pneumonia (see interstitial pneumonia/s)}

_{AIP
acute interstitial pneumonia (see interstitial pneumonia/s)}

_ALI
acute lung injury

_{APRV
airway pressure release ventilation}

_ARDS
adult/acute respiratory distress syndrome

_{ARF
acute respiratory failure}

_B

_BAL
broncheoalveolar lavage

_{BALF
broncheoalveolar lavage fluid}

_BOOP
bronchiolitis obliterans organizing pneumonia

_{BPD
bronchopleural dysplasia}

_BPF
bronchopleural fistula