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Critical Care Reviews |

Predicting Fluid Responsiveness in ICU Patients*: A Critical Analysis of the Evidence

Frédéric Michard, MD, PhD; Jean-Louis Teboul, MD, PhD
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*From the Medical ICU, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, Le Kremlin-Bicêtre, Université Paris XI, France.

Correspondence to: Frédéric Michard, MD, PhD, Service de Réanimation Médicale, CHU de Bicêtre, Université Paris XI, 78, rue du Général Leclerc, 94275 Le Kremlin Bicêtre cedex, France; e-mail: f.michard@wanadoo.fr



Chest. 2002;121(6):2000-2008. doi:10.1378/chest.121.6.2000
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Study objective: To identify and critically review the published peer-reviewed, English-language studies investigating predictive factors of fluid responsiveness in ICU patients.

Design: Studies were collected by doing a search in MEDLINE (from 1966) and scanning the reference lists of the articles. Studies were selected according to the following criteria: volume expansion performed in critically ill patients, patients classified in two groups (responders and nonresponders) according to the effects of volume expansion on stroke volume or on cardiac output, and comparison of responder and nonresponder patients’ characteristics before volume expansion.

Results: Twelve studies were analyzed in which the parameters tested were as follows: (1) static indicators of cardiac preload (right atrial pressure [RAP], pulmonary artery occlusion pressure [PAOP], right ventricular end-diastolic volume [RVEDV], and left ventricular end-diastolic area [LVEDA]); and (2) dynamic parameters (inspiratory decrease in RAP [ΔRAP], expiratory decrease in arterial systolic pressure [Δdown], respiratory changes in pulse pressure [ΔPP], and respiratory changes in aortic blood velocity [ΔVpeak]). Before fluid infusion, RAP, PAOP, RVEDV, and LVEDA were not significantly lower in responders than in nonresponders in three of five studies, in seven of nine studies, in four of six studies, and in one of three studies, respectively. When a significant difference was found, no threshold value could discriminate responders and nonresponders. Before fluid infusion, ΔRAP, Δdown, ΔPP, and ΔVpeak were significantly higher in responders, and a threshold value predicted fluid responsiveness with high positive (77 to 95%) and negative (81 to 100%) predictive values.

Conclusion: Dynamic parameters should be used preferentially to static parameters to predict fluid responsiveness in ICU patients.

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