In addition the use of non-invasive bedside techniques as pleural and lung ultrasonography (PLUS), electrical impedance tomography (EIT), and transthoracic echocardiography (TTE) may allow us to distinguish between lung recruitment and tidal overdistension at different PEEP/mPaw settings, in order to limit pulmonary and hemodynamic complications during CMV and HFOV, and may help in the assessment of recruitable lungs.