In a patient of cardiopulmonary arrest best way of airway mantainence is:
OROTRACHEAL INTUBATION
Indicated

Emergency cases(2-3 min)
Cardiopulmonary arrest cases
(Cordiopulmonary Resuciation)
Of Bone in around Nose
Bag valve mask ventilation.
Nasotracheal intubation.
Orotracheal intubation.
Guedel airway.