To examine the impact of different endotracheal tube (ETT) suction techniques on regional end-expiratory lung volume (EELV) and tidal volume (V T) in an animal model of surfactant-deficient lung injury.
Six 2-week old piglets were intubated (4.0 mm ETT), muscle-relaxed and ventilated, and lung injury was induced with repeated saline lavage. In each animal, open suction (OS) and two methods of closed suction (CS) were performed in random order using both 5 and 8 French gauge (FG) catheters. The pre-suction volume state of the lung was standardised on the inflation limb of the pressure-volume relationship. Regional EELV and V T expressed as a proportion of the impedance change at vital capacity (%Z VCroi) within the anterior and posterior halves of the chest were measured during and for 60 s after suction using electrical impedance tomography.
During suction, 5 FG CS resulted in preservation of EELV in the anterior (non-dependent) and posterior (dependent) lung compared to the other permutations, but these only reached significance in the anterior regions (p < 0.001 repeated-measures ANOVA). V T within the anterior, but not posterior lung was significantly greater during 5FG CS compared to 8 FG CS; the mean difference was 15.1 [95% CI 5.1, 25.1]%Z VCroi. Neither catheter size nor suction technique influenced post-suction regional EELV or V T compared to pre-suction values (repeated-measures ANOVA).
ETT suction causes transient loss of EELV and V T throughout the lung. Catheter size exerts a greater influence than suction method, with CS only protecting against derecruitment when a small catheter is used, especially in the non-dependent lung.
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We thank Magdy Sourial, Shane Osterfield, Scott Dunlop and Ethel Ryan for their assistance in the completion of this project. DGT is supported by a National Health and Medical Research Council Clinical Research Fellowship (grant ID 491286).
Conflict of interest statement
The authors declare that there are no competing interests.
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Tingay, D.G., Copnell, B., Grant, C.A. et al. The effect of endotracheal suction on regional tidal ventilation and end-expiratory lung volume. Intensive Care Med 36, 888–896 (2010). https://doi.org/10.1007/s00134-010-1849-x
- Lung volume measurement
- Mechanical ventilation
- Electrical impedance tomography
- Lung volume