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This article is part of the supplement: 27th International Symposium on Intensive Care and Emergency Medicine

Poster presentation

Noninvasive alveolar recruitment maneuver induces cytokine release in healthy volunteers

L Malbouisson1, T Szeles1, C Carvalho1, P Pelosi2, M Carmona1 and J Auler1

Author Affiliations

1 São Paulo University Medical School, São Paulo, Brazil

2 University of Insubria, Varese, Italy

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Critical Care 2007, 11(Suppl 2):P194  doi:10.1186/cc5354

The electronic version of this article is the complete one and can be found online at:


Published:22 March 2007

© 2007 BioMed Central Ltd.

Introduction

Alveolar recruitment maneuver (ARM) using high airway pressures has been shown to re-expand atelectasis and to improve gas exchanges after general anesthesia; however, ARM may lead to lung stretching-induced inflammatory response. The objective of this study was to evaluate plasma cytokine behavior after an ARM in healthy volunteers.

Methods

After obtaining ethical committee approval and informed consent, a basal blood sample was collected in 10 healthy volunteers. Continuous positive airway pressure (CPAP) was noninvasively applied (BiPAP Vision®; Respironics, USA) using a total face mask. CPAP was increased by 3 cmH2O from 5 to 20 cmH2O every five breaths. At CPAP of 20 cmH2O, an inspiratory pressure of 20 cmH2O above CPAP was implemented during 10 breaths. After that, CPAP was stepwise decreased in an inverse fashion. Pulse oximetry, arterial pressure and heart rate were measured before and after ARM. Additional blood samples were drawn at 30 minutes, 2 and 12 hours. TNFα, IL-1β, IL-6, IL-8, IL-10 and IL-12 were measured by the flow cytometry technique (Cytometric Bead Array BD™ Kit). The highest cytokine value at 30 minutes or 2 hours after ARM was considered the peak value measurement. Data were analyzed using a paired t test and one-way RM ANOVA. P < 0.05 was significant.

Results

Four men and six women with a mean age of 26 ± 1 years and mean BMI of 23.8 ± 3.6 kg/m2 were studied. No changes were observed in heart rate or MAP after ARM, while pulse oximetry increased from 97.2 ± 0.8% to 98.4 ± 0.7% (P = 0.009). As shown in Figure 1, ARM induced a significant increase in the peak plasma level concentration of all cytokines that returned to basal levels within 12 hours. No adverse effects were observed during and after ARM.

Conclusion

Despite beneficial effects in reversing atelectasis, ARM-induced lung stretching was associated with an inflammatory response in healthy volunteers.