Blood-Gas changes Ventilator Restrictive disorder obstructive Alveolar ventilatory volume PaO2+ and Paco2 f proportionately PaO2↓+PaCO,↑Blood-Gas changes PaO2 + PaCO2  Ventilatory disorder PaO2 and PaCO2  proportionately Restrictive obstructive Alveolar ventilatory volume 