Which method is NOT used to open the airway on an adult casualty?

The mouth-to-mouth method is not primarily used to open the airway of an adult casualty. Instead, it is a technique used for providing rescue breaths during cardiopulmonary resuscitation (CPR) or artificial respiration. The goal of opening the airway is to ensure that the airway is clear and unobstructed, allowing for effective breathing or ventilation.

In contrast, the head-tilt chin-lift method, jaw-thrust method, and head tilt with neck extension are all techniques focused specifically on maintaining patency of the airway. The head-tilt chin-lift method involves tilting the head back and lifting the chin to open the airway by lifting the tongue away from the back of the throat. The jaw-thrust method is particularly useful in cases where a spinal injury is suspected, as it opens the airway without moving the neck. The head tilt method with neck extension also serves the same purpose of opening the airway, highlighting the importance of these techniques in emergency situations.