in 22 patients during thoracotomy in the lateral position , the effects of selective positive end-expiratory pressure ( peep ) to the dependent lung while simultaneously ventilating the non-dependent lung at zero end-expiratory pressure ( zeep ) on ( 1 ) inspired o2 concentration required to maintain adequate pao2 during thoractomy and 2 ) alveolar-arterial oxygen difference ( aao2d ) while breathing 100 percent o2 at the end of thoractomy were examined and compared to ventilation of both lungs at zeep , selective peep to the dependent lung resulted in adequate pao2 with a lower inspired o2 concentration ( 44 +/- sd 6 % versus 70 +/- sd 21 % ) , and a smaller aso2d while breathing 100 percent o2 189 +/- sd 31 versus 342 +/- sd 69 torr ) at the end of thoracotomy .
C0024109
lung
C0035203
breathing