<prompt> True about endotracheal intubation is:It reduces normal anatomical dead spaceIt produces decrease in resistance to respirationSubglottic edema is most common complicationAll of the above  <response>: A i.e. It reduces the normal anatomical dead space - Endotracheal tube decreases the anatomical dead space 150 ml to as less as 25 ml. - Endotracheal intubation increases the resistance to respiration; obstruction from kinking, foreign body or secretions fuher increase resistance. Subglottic edema, though a complication, is not the most common one. 