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Background  We explored whether positioning patients in a 25° back-up sniffing position improved glottic views and ease of intubation.    Methods  In the first part of the study, patients were intubated in the standard supine sniffing position. In the second part, the back of the operating table was raised 25° from the horizontal by flexion of the torso at the hips while maintaining the sniffing position. The best view obtained during laryngoscopy was assessed using the Cormack and Lehane classification and Percentage of Glottic Opening (POGO) score. The number of attempts at both laryngoscopy and tracheal intubation, together with the use of ancillary equipment and manoeuvres were recorded. The ease of intubation was indirectly assessed by recording the time interval between beginning of laryngoscopy and insertion of the tracheal tube.    Results  Seven hundred eighty one unselected surgical patients scheduled for non-emergency surgery were included. In the back-up position, ancillary laryngeal manoeuvres, which included cricoid pressure, backwards upwards rightward pressure and external laryngeal manipulation, were required less frequently (19.6 % versus 24.6 %,  p  = 0.004). The time from beginning of laryngoscopy to insertion of the tracheal tube was 14 % shorter (median time 24 versus 28 s,  p  = 0.031) in the back-up position. There was no significant difference in glottic views.    Conclusions  The 25° back-up position improved the ease of intubation as judged by the need for fewer ancillary manoeuvres and shorter time for intubation.    Trial registration  ClinicalTrials.gov Identifier:  NCT02934347  registered retrospectively on 14th Oct 2016.    Electronic supplementary material  The online version of this article (doi:10.1186/s12871-016-0280-4) contains supplementary material, which is available to authorized users.

Comparison of glottic views and intubation times in the supine and 25 degree back-up positions