“…All included studies were published from 2011 to 2017, with a mean sample size of 42 in the 6 studies (range from 26 to 60) and 251 pediatric patients. In studies included in our meta‐analysis, diagnoses of FR by SVV were performed based on pulse index continuous cardiac output (PiCCO Plus ® , Version 6.0, Pulsion Medical Systems, Munich, Germany), 14 ultrasonic cardiac output monitor (USCOM, Sydney, Australia), 21 noninvasive cardiac output monitor (NICOM, Cheetah Medical, Wilmington, DE, USA), 1 or/and a transesophageal echocardiogram (TEE, Philips iE33 and Cardio QP TM , Deltex Medical TM , Chichester, UK 3,22 monitoring device. In these included studies, all patients were sedated and ventilated with tidal volumes (TVs) of 8–10 ml/kg 23 .…”