Increased Intra-abdominal Pressure Affects Respiratory Variations in Arterial Pressure in Normovolaemic and Hypovolaemic Mechanically Ventilated Healthy Pigs

Overview

Journal Intensive Care Med

Specialty Critical Care

Date 2006 Nov 15

PMID 17102964

Citations 36

Authors

Serge Duperret

Franck Lhuillier

Vincent Piriou

Emmanuel Vivier

Olivier Metton

Patricia Branche

Guy Annat

Karim Bendjelid

Jean Paul Viale

Affiliations

Soon will be listed here.

Abstract

Objective: To evaluate the effect of increased intra-abdominal pressure (IAP) on the systolic and pulse pressure variations induced by positive pressure ventilation in a porcine model.

Design And Setting: Experimental study in a research laboratory.

Subjects: Seven mechanically ventilated and instrumented pigs prone to normovolaemia and hypovolaemia by blood withdrawal.

Intervention: Abdominal banding gradually increased IAP in 5-mmHg steps up to 30 mmHg.

Measurements And Main Results: Variations in systolic pressure, pulse pressure, inferior vena cava flow, and pleural and transmural (LVEDPtm) left-ventricular end-diastolic pressure were recorded at each step. Systolic pressure variations were 6.1+/-3.1%, 8.5+/-3.6% and 16.0+/-5.0% at 0, 10, and 30 mmHg IAP in normovolaemic animals (mean+/-SD; p<0.01 for IAP effect). They were 12.7+/-4.6%, 13.4+/-6.7%, and 23.4+/-6.3% in hypovolaemic animals (p<0.01 vs normovolaemic group) for the same IAP. Fluctuations of the inferior vena cava flow disappeared as the IAP increased. Breath cycle did not induce any variations of LVEDPtm for 0 and 30 mmHg IAP.

Conclusions: In this model, the systolic pressure and pulse pressure variations, and inferior vena cava flow fluctuations were dependent on IAP values which caused changes in pleural pressure swing, and this dependency was more marked during hypovolaemia. The present study suggests that dynamic indices are not exclusively related to volaemia in the presence of increased IAP. However, their fluid responsiveness predictive value could not be ascertained as no fluid challenge was performed.

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