Retention of mouth-to-mouth, mouth-to-mask and mouth-to-face shield ventilation

Background: Retention of mouth-to-mouth, mouth-to-mask and
mouth-to-face shield ventilation techniques is poorly
understood.Methods: A prospective randomised clinical trial was
undertaken in January 2004 in 70 candidates randomly assigned to
training in mouth-to-mouth, mouth-to-mask or mouth-to-face shield
ventilation. Each candidate was trained for 10 min, after which
tidal volume, respiratory rate, minute volume, peak airway pressure
and the presence or absence of stomach inflation were measured. 58
subjects were reassessed 1 year later and study parameters were
recorded again. Data were analysed with ANOVA, \textgreekq2 and
McNemar tests.Results: Tidal volume, minute volume, peak airway
pressure, ventilation rate and stomach inflation rate increased
significantly at reassessment with all ventilation techniques
compared with the initial assessment. However, at reassessment,
mean (SD) tidal volume (960 (446) vs 1008 (366) vs 1402 (302) ml;
p