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Background  Early after intubation, a layer of biofilm covers the inner lumen of the endotracheal tube (ETT). Cleaning the ETT might prevent airways colonization by pathogens, reduce resistance to airflow, and decrease sudden ETT obstruction. We investigated the effectiveness of a cleaning closed suction system in maintaining the endotracheal tube free from secretions.    Methods  We conducted a single center, randomized controlled trial, in the general intensive care unit of a tertiary-level university hospital. We enrolled 40 adult critically ill patients expected to remain intubated for more than 48 h, within 24 h from intubation. Patients were randomized to receive three ETT cleaning maneuvers/day using a novel device (Airway Medix Closed Suction System™, cleaning group) or to standard care (no ETT cleaning, standard closed suction, control group). After extubation, the amount of secretions in the ETTs was measured by micro-computed tomography.    Results  The volume of secretions in the ETTs from the cleaning group was lower than controls (0.081 [0.021–0.306] vs. 0.568 [0.162–0.756] mL,  p  = 0.001), corresponding to a cross-sectional area reduction six times lower (1[0–3] vs. 6 [2–10] %,  p  = 0.001). In a subset of 16 patients, the resistance to airflow tended to be lower after 1 day of treatment ( p  = 0.063) and was lower after 2 days (0.024), while no difference was present at enrollment ( p  = 0.922). ETT colonization did not differ between the two groups.    Conclusions  The use of a novel cleaning closed suction system proved to be effective in reducing secretions present in the ETT after extubation, possibly reducing resistance to airflow during intubation.  Trial registration: clinicaltrials.gov NCT01912105    Electronic supplementary material  The online version of this article (doi:10.1186/s13613-015-0101-9) contains supplementary material, which is available to authorized users.

annals of intensive care

The use of a novel cleaning closed suction system reduces the volume of secretions within the endotracheal tube as assessed by micro-computed tomography: a randomized clinical trial