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Optimal duration of a sustained inflation recruitment maneuver in ARDS patients

Jean-Michel Arnal| Jérémie Paquet| Marc Wysocki| Didier Demory| Stéphane Donati| Isabelle Granier| Gaëlle Corno| Jacques Durand-Gasselin
Original
Volume 37, Issue 10 / October , 2011

Pages 1588 - 1594

Abstract

Purpose

To measure the dynamics of recruitment and the hemodynamic status during a sustained inflation recruitment maneuver (RM) in order to determine the optimal duration of RM in acute respiratory distress syndrome (ARDS) patients.

Methods

This prospective study was conducted in a 12-bed intensive care unit (ICU) in a general hospital. A 40 cmH2O sustained inflation RM maintained for 30 s was performed in 50 sedated ventilated patients within the first 24 h of meeting ARDS criteria. Invasive arterial pressures, heart rate, and SpO2 were measured at 10-s intervals during the RM. The volume increase during the RM was measured by integration of the flow required to maintain the pressure at 40 cmH2O, which provides an estimation of the volume recruited during the RM. Raw data were corrected for gas consumption and fitted with an exponential curve in order to determine an individual time constant for the volume increase.

Results

The average volume increase and time constant were 210 ± 198 mL and 2.3 ± 1.3 s, respectively. Heart rate, diastolic arterial pressure, and SpO2 did not change during or after the RM. Systolic and mean arterial pressures were maintained at 10 s, decreased significantly at 20 and 30 s during the RM, and recovered to the pre-RM value 30 s after the end of the RM (ANOVA, p < 0.01).

Conclusions

In early-onset ARDS patients, most of the recruitment occurs during the first 10 s of a sustained inflation RM. However, hemodynamic impairment is significant after the tenth second of RM.

Keywords

References

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