“…105 Eight manikin studies with simulated cardiac arrest (LOE 5) 89,90,96,[112][113][114][115][116] and 8 manikin studies without simulated cardiac arrest showed that successful insertion rates and/or time to insertion or to ventilation for a variety of supraglottic airway devices were as good, or better than, for the tracheal tube (LOE 5). [117][118][119][120][121][122][123][124] Nine studies documented that when a supraglottic airway device is used as a rescue airway after failed tracheal intubation, most patients can be ventilated successfully with the supraglottic airway device (LOE 2 98,99,103 ; LOE 3 [125][126][127][128] ; LOE 5 107,129 ).…”