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Open Access 01-02-2011 | Research

Pulse pressure variation and stroke volume variation during increased intra-abdominal pressure: an experimental study

Authors: Didier Jacques, Karim Bendjelid, Serge Duperret, Joëlle Colling, Vincent Piriou, Jean-Paul Viale

Published in: Critical Care | Issue 1/2011

Abstract

Introduction

The aim of this study was to evaluate dynamic indices of fluid responsiveness in a model of intra-abdominal hypertension.

Methods

Nine mechanically-ventilated pigs underwent increased intra-abdominal pressure (IAP) by abdominal banding up to 30 mmHg and then fluid loading (FL) at this IAP. The same protocol was carried out in the same animals made hypovolemic by blood withdrawal. In both volemic conditions, dynamic indices of preload dependence were measured at baseline IAP, at 30 mmHg of IAP, and after FL. Dynamic indices involved respiratory variations in stroke volume (SVV), pulse pressure (PPV), and systolic pressure (SPV, %SPV and Δdown). Stroke volume (SV) was measured using an ultrasound transit-time flow probe placed around the aortic root. Pigs were considered to be fluid responders if their SV increased by 15% or more with FL. Indices of fluid responsiveness were compared with a Mann-Whitney U test. Then, receiver operating characteristic (ROC) curves were generated for these parameters, allowing determination of the cut-off values by using Youden's method.

Results

Five animals before blood withdrawal and all animals after blood withdrawal were fluid responders. Before FL, SVV (78 ± 19 vs 42 ± 17%), PPV (64 ± 18 vs 37 ± 15%), SPV (24 ± 5 vs 18 ± 3 mmHg), %SPV (24 ± 4 vs 17 ± 3%) and Δdown (13 ± 5 vs 6 ± 4 mmHg) were higher in responders than in non-responders (P < 0.05). Areas under ROC curves were 0.93 (95% confidence interval: 0.80 to 1.06), 0.89 (0.70 to 1.07), 0.90 (0.74 to 1.05), 0.92 (0.78 to 1.06), and 0.86 (0.67 to 1.06), respectively. Threshold values discriminating responders and non-responders were 67% for SVV and 41% for PPV.

Conclusions

In intra-abdominal hypertension, respiratory variations in stroke volume and arterial pressure remain indicative of fluid responsiveness, even if threshold values identifying responders and non-responders might be higher than during normal intra-abdominal pressure. Further studies are required in humans to determine these thresholds in intra-abdominal hypertension.

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Title: Pulse pressure variation and stroke volume variation during increased intra-abdominal pressure: an experimental study
Authors: Didier Jacques
Karim Bendjelid
Serge Duperret
Joëlle Colling
Vincent Piriou
Jean-Paul Viale
Publication date: 01-02-2011
Publisher: BioMed Central
Published in: Critical Care / Issue 1/2011
Electronic ISSN: 1364-8535
DOI: https://doi.org/10.1186/cc9980

At a glance: The STEP trials

Springer Medicine

Pulse pressure variation and stroke volume variation during increased intra-abdominal pressure: an experimental study

Abstract

Introduction

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Introduction

Methods

Results

Conclusions

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