We conducted a large-scale, observational populationbased
cohort study of patients who experienced adultwitnessed,
non-traumatic OHCA and were treated by
EMS personnel using advanced airways (ETI or SGA) in
Osaka Prefecture, Japan. In this study, we compared the
difference of outcomes from OHCA between ETI and
SGA. In addition, we evaluated the association between
outcomes and the time-course from collapse to
advanced airway placement.