Mini Fluid chAlleNge and End-expiratory Occlusion Test and to Assess flUid responsiVEness in opeRating Room

End-expiratory occlusion test (EEOT) has been previously successfully tested in surgical patients, consisting of the interruption of the mechanical ventilation for 30 seconds, and in the evaluation of the changes in the SV. The mini fluid challenge test (mFC) aims at testing the increase in SV after the rapid administration of a small aliquot of the predefined FC. Both these test have been previously evaluated in small-sized studies and never compared each other.