Sniffing position combined with mouth opening improves facemask ventilation in children with adenotonsillar hypertrophy
This study evaluates the influence of sniffing position combined with mouth opening on the effectiveness of facemask ventilation in paralyzed pediatric patients undergoing adenotonsillectomy during sevoflurane-N2O anesthesia. Methods:
After Institutional Ethics Committee approval, 40 children 5–11 years of age who were scheduled for an elective adenotonsillectomy operation were enrolled in this prospective randomized study. After routine monitoring and pre-oxygenation, anesthesia was induced with sevoflurane 8% in a mixture of 50% N2O-O2. Three minutes after the administration of vecuronium, the sequence of the positions was randomized. Three positions were applied during facemask ventilation: Position CN (closed mouth – neutral head and neck position), position CS (closed mouth-sniffing position) and position OS (opened mouth-sniffing position). Volume-controlled ventilation was started. Peak inspiratory pressure (PIP), tidal volume (VT), expired tidal volume (VTexp) and end-tidal CO2 pressure were recorded. The percent of leakage was calculated. The primary endpoint of this study was the expired tidal volume (VTexp). Results:
There was a statistically significant difference among the three positions for VTexp and PIP values. The OS resulted in higher VTexp values when compared with CN (P=0.022). The OS was significantly better than the other two positions, resulting in lower PIP values (P<0.001 and P=0.004, for CN and CS, respectively). The OS also resulted in less leakage during facemask ventilation when compared with CN and CS. Conclusions:
Sniffing position combined with mouth opening improves VTexp and PIP values during facemask ventilation during sevoflurane-N2O anesthesia in paralyzed pediatric patients with adenotonsillar hypertrophy.
Document Type: Research Article
Affiliations: Department of Anaesthesia and Intensive Care Medicine, Ankara Training and Research Hospital, Ankara, Turkey
Publication date: 2011-05-01