to investigate the contribution of local mechanical factors to the alteration in ventricular function that occurs during ventilation with positive end-expiratory pressure ( peep ) , the hemodynamic effects of increasing end-expiratory pressure with both lungs ventilated , and with the upper lobes , lower lobes , right and left lungs selectively ventilated , were examined in 20 anesthetized open-chest dogs .
C0024109
lungs
C0225756
upper lobes