Does inferior vena cava respiratory variability predict fluid responsiveness in spontaneously breathing patients?

Norair Airapetian, Julien Maizel, Ola Alyamani, Yazine Mahjoub, Emmanuel Lorne, Melanie Levrard, Nacim Ammenouche, Aziz Seydi, François Tinturier, Eric Lobjoie, Hervé Dupont, Michel Slama, Norair Airapetian, Julien Maizel, Ola Alyamani, Yazine Mahjoub, Emmanuel Lorne, Melanie Levrard, Nacim Ammenouche, Aziz Seydi, François Tinturier, Eric Lobjoie, Hervé Dupont, Michel Slama

Abstract

Introduction: We have almost no information concerning the value of inferior vena cava (IVC) respiratory variations in spontaneously breathing ICU patients (SBP) to predict fluid responsiveness.

Methods: SBP with clinical fluid need were included prospectively in the study. Echocardiography and Doppler ultrasound were used to record the aortic velocity-time integral (VTI), stroke volume (SV), cardiac output (CO) and IVC collapsibility index (cIVC) ((maximum diameter (IVCmax)- minimum diameter (IVCmin))/ IVCmax) at baseline, after a passive leg-raising maneuver (PLR) and after 500 ml of saline infusion.

Results: Fifty-nine patients (30 males and 29 females; 57 ± 18 years-old) were included in the study. Of these, 29 (49 %) were considered to be responders (≥10 % increase in CO after fluid infusion). There were no significant differences between responders and nonresponders at baseline, except for a higher aortic VTI in nonresponders (16 cm vs. 19 cm, p = 0.03). Responders had a lower baseline IVCmin than nonresponders (11 ± 5 mm vs. 14 ± 5 mm, p = 0.04) and more marked IVC variations (cIVC: 35 ± 16 vs. 27 ± 10 %, p = 0.04). Prediction of fluid-responsiveness using cIVC and IVCmax was low (area under the curve for cIVC at baseline 0.62 ± 0.07; 95 %, CI 0.49-0.74 and for IVCmax at baseline 0.62 ± 0.07; 95 % CI 0.49-0.75). In contrast, IVC respiratory variations >42 % in SBP demonstrated a high specificity (97 %) and a positive predictive value (90 %) to predict an increase in CO after fluid infusion.

Conclusions: In SBP with suspected hypovolemia, vena cava size and respiratory variability do not predict fluid responsiveness. In contrast, a cIVC >42 % may predict an increase in CO after fluid infusion.

Figures

Fig. 1
Fig. 1
Receiver operating characteristic curves for discriminating between volume expansion responders and nonresponders. ∆CO change in CO between baseline and after PLR, VCmax maximum inferior vena cava diameter at baseline, cIVC inferior vena cava collapsibility index at baseline, PLR passive leg raising
Fig. 2
Fig. 2
Inferior vena cava collapsibility index at baseline (expressed as a percentage) in responders and nonresponders. Individual values (open circles) and the mean ± SD per group (filled circles and solid lines). Se sensitivity, Sp specificity. * p <0.05 vs. nonresponders
Fig. 3
Fig. 3
Maximum inferior vena cava diameter at baseline in responders and nonresponders. Individual values (open circles) and the mean ± SD per group (filled circles and solid lines). Se sensitivity, Sp specificity. * p <0.05 vs. nonresponders

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Source: PubMed

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