Huang H, et al. - Via this meta-analysis, researchers explored the predictive value of respiratory variations in the inferior vena cava diameter (ΔIVCD) for fluid responsiveness in patients with circulatory shock receiving mechanical ventilation. They analyzed data obtained from PubMed, Embase, and the Cochrane Central Register of Controlled Trials up to June 2017. They calculated the diagnostic OR (DOR), sensitivity, and specificity. This analysis included 603 patients, 324 (53.7%) of whom were fluid-responsive. Across studies, variations in cutoff values of ΔIVCD were evident, ranging from 8% to 21%. Overall, findings demonstrated moderately good performance displayed by the ΔIVCD in predicting fluid responsiveness in patients with circulatory shock receiving mechanical ventilation.