Which technique should be used to open the airway in an unresponsive victim?

The jaw-thrust maneuver is the recommended technique for opening the airway in an unresponsive victim, especially when there is a suspicion of spinal injury. This technique helps to align the airway without moving the neck, thus minimizing the risk of exacerbating any existing spinal injuries. The jaw-thrust maneuver involves placing your fingers behind the angle of the victim's jaw and pushing the jaw forward while keeping the head in a neutral position. This action lifts the tongue off the back of the throat, allowing for unobstructed breathing.

In contrast, while the head-tilt, chin-lift maneuver is effective for opening the airway in most cases, it can lead to further spinal injury if the victim has a possible neck injury since it involves tilting the head backward. Tilting the head back is not an appropriate method for unresponsive individuals, particularly those suspected of having cervical spine issues. Holding the chin down does not effectively open the airway and may actually obstruct it further. Thus, the jaw-thrust maneuver is the preferred choice in this scenario for ensuring the safety and effectiveness of airway management.