Oxygenation index ( OI ) , difference of alveoli-arterial oxygen pressure ( P ( A - ) O@ ) , static lung compliance ( Cstat ) , and airway resistance ( Raw ) were measured before caridopulmonary bypass ( CPB , T@ ) , @ minutes after the CPB ( T@ ) , @ h after the operation ( T@ ) , @ h after the operation ( T@ ) and @ h after the operation ( T@ ) .