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. 2018 Feb 8;22(1):32.
doi: 10.1186/s13054-017-1938-0.

End-expiratory occlusion maneuver to predict fluid responsiveness in the intensive care unit: an echocardiographic study

Delphine Georges  1 , Hugues de Courson  1 , Romain Lanchon  1 , Musa Sesay  1 , Karine Nouette-Gaulain  1   2   3 , Matthieu Biais  4   5   6
Affiliations

End-expiratory occlusion maneuver to predict fluid responsiveness in the intensive care unit: an echocardiographic study

Delphine Georges et al. Crit Care. .

Abstract

Background: In mechanically ventilated patients, an increase in cardiac index during an end-expiratory-occlusion test predicts fluid responsiveness. To identify this rapid increase in cardiac index, continuous and instantaneous cardiac index monitoring is necessary, decreasing its feasibility at the bedside. Our study was designed to investigate whether changes in velocity time integral and in peak velocity obtained using transthoracic echocardiography during an end-expiratory-occlusion maneuver could predict fluid responsiveness.

Methods: This single-center, prospective study included 50 mechanically ventilated critically ill patients. Velocity time integral and peak velocity were assessed using transthoracic echocardiography before and at the end of a 12-sec end-expiratory-occlusion maneuver. A third set of measurements was performed after volume expansion (500 mL of saline 0.9% given over 15 minutes). Patients were considered as responders if cardiac output increased by 15% or more after volume expansion.

Results: Twenty-eight patients were responders. At baseline, heart rate, mean arterial pressure, cardiac output, velocity time integral and peak velocity were similar between responders and non-responders. End-expiratory-occlusion maneuver induced a significant increase in velocity time integral both in responders and non-responders, and a significant increase in peak velocity only in responders. A 9% increase in velocity time integral induced by the end-expiratory-occlusion maneuver predicted fluid responsiveness with sensitivity of 89% (95% CI 72% to 98%) and specificity of 95% (95% CI 77% to 100%). An 8.5% increase in peak velocity induced by the end-expiratory-occlusion maneuver predicted fluid responsiveness with sensitivity of 64% (95% CI 44% to 81%) and specificity of 77% (95% CI 55% to 92%). The area under the receiver operating curve generated for changes in velocity time integral was significantly higher than the one generated for changes in peak velocity (0.96 ± 0.03 versus 0.70 ± 0.07, respectively, P = 0.0004 for both). The gray zone ranged between 6 and 10% (20% of the patients) for changes in velocity time integral and between 1 and 13% (62% of the patients) for changes in peak velocity.

Conclusions: In mechanically ventilated and sedated patients in the neuro Intensive Care Unit, changes in velocity time integral during a 12-sec end-expiratory-occlusion maneuver were able to predict fluid responsiveness and perform better than changes in peak velocity.

Keywords: Echocardiography; End-expiratory occlusion; Fluid responsiveness; Heart-lung interactions; Volume expansion.

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Conflict of interest statement

Ethics approval and consent to participate

The present study was approved by the Institutional Review Board (Comité de Protection des Personnes Sud-Ouest et Outre Mer III, Bordeaux, France number DC2016/14).

Consent for publication

The manuscript has been read and its submission approved by all co-authors. Patients were prospectively included after informed consent from the patient’s next of kin.

Competing interests

MB received honoraria from Edwards Lifesciences and Pulsion Medical System as a lecturer. The other authors have no competing interests.

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Individual values in responders (n = 28) and non-responders (n = 22) of the variations in velocity time integral (%) and peak velocity of aortic blood flow (%) during a 12-sec end-expiratory occlusion maneuver. ∆VTI-EEO, changes in velocity time integral (%) induced by end-expiratory occlusion. ∆Vmax-EEO, changes in peak velocity induced by end-expiratory occlusion. Responders, change in cardiac output ≥15% after volume expansion; non-responders, change in cardiac output <15% after volume expansion. Volume expansion, 500 mL saline 0.9% given over 15 minutes
Fig. 2
Fig. 2
Receiver operating characteristics curves evaluating the ability of the variations in velocity time integral (%) and peak velocity of aortic blood flow (%) during a 12-sec end-expiratory occlusion maneuver to predict fluid responsiveness. ∆VTI-EEO, changes in velocity time integral (%) induced by end-expiratory occlusion. ∆Vmax, changes in peak velocity induced by end-expiratory occlusion. Responders, change in cardiac output ≥15% after volume expansion; non-responders, change in cardiac output <15% after volume expansion. Volume expansion, 500 mL saline 0.9% given over 15 minutes
Fig. 3
Fig. 3
Gray zone of the variations in velocity time integral (%) and peak velocity of aortic blood flow (%) induced by a 12-sec end-expiratory occlusion maneuver to predict fluid responsiveness. The blue curve indicates sensitivity, and the red curve indicates specificity. ∆VTI-EEO, changes in velocity time integral (%) induced by end-expiratory occlusion test. ∆Vmax, changes in peak velocity induced by end-expiratory occlusion. Responders, change in cardiac output ≥15% after volume expansion; non-responders, change in cardiac output <15% after volume expansion. Volume expansion, 500 mL saline 0.9% given over 15 minutes
See this image and copyright information in PMC

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