{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T21:59:02Z","timestamp":1792533542931,"version":"4.5.0"},"reference-count":45,"publisher":"Springer Science and Business Media LLC","issue":"5","license":[{"start":{"date-parts":[[2012,10,8]],"date-time":"2012-10-08T00:00:00Z","timestamp":1349654400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/"},{"start":{"date-parts":[[2012,10,8]],"date-time":"2012-10-08T00:00:00Z","timestamp":1349654400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Crit Care"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                        <jats:title>Introduction<\/jats:title>\n                        <jats:p>To investigate whether respiratory variation of inferior vena cava diameter (cIVC) predict fluid responsiveness in spontaneously breathing patients with acute circulatory failure (ACF).<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Methods<\/jats:title>\n                        <jats:p>Forty patients with ACF and spontaneous breathing were included. Response to fluid challenge was defined as a 15% increase of subaortic velocity time index (VTI) measured by transthoracic echocardiography. Inferior vena cava diameters were recorded by a subcostal view using M Mode. The cIVC was calculated as follows: (Dmax - Dmin\/Dmax) \u00d7 100 and then receiver operating characteristic (ROC) curves were generated for cIVC, baseline VTI, E wave velocity, E\/A and E\/Ea ratios.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Results<\/jats:title>\n                        <jats:p>Among 40 included patients, 20 (50%) were responders (R). The causes of ACF were sepsis (<jats:italic>n<\/jats:italic> = 24), haemorrhage (<jats:italic>n<\/jats:italic> = 11), and dehydration (<jats:italic>n<\/jats:italic> = 5). The area under the ROC curve for cIVC was 0.77 (95% CI: 0.60-0.88). The best cutoff value was 40% (Se = 70%, Sp = 80%). The AUC of the ROC curves for baseline E wave velocity, VTI, E\/A ratio, E\/Ea ratio were 0.83 (95% CI: 0.68-0.93), 0.78 (95% CI: 0.61-0.88), 0.76 (95% CI: 0.59-0.89), 0.58 (95% CI: 0.41-0.75), respectively. The differences between AUC the ROC curves for cIVC and baseline E wave velocity, baseline VTI, baseline E\/A ratio, and baseline E\/Ea ratio were not statistically different (<jats:italic>p<\/jats:italic> = 0.46, <jats:italic>p<\/jats:italic> = 0.99, <jats:italic>p<\/jats:italic> = 1.00, <jats:italic>p<\/jats:italic> = 0.26, respectively).<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Conclusion<\/jats:title>\n                        <jats:p>In spontaneously breathing patients with ACF, high cIVC values (&gt;40%) are usually associated with fluid responsiveness while low values (&lt; 40%) do not exclude fluid responsiveness.<\/jats:p>\n                     <\/jats:sec>","DOI":"10.1186\/cc11672","type":"journal-article","created":{"date-parts":[[2012,10,8]],"date-time":"2012-10-08T14:14:10Z","timestamp":1349705650000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":295,"title":["Respiratory variations of inferior vena cava diameter to predict fluid responsiveness in spontaneously breathing patients with acute circulatory failure: need for a cautious 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