• Loss of consciousness.
• Bluishness of the face.

• Chest and abdomen real estate.
• No breathing noise.
To determine if breathing is present, open the airway, place your ear to the victim's mouth, and watch for signs of breathing by sight, hearing, and touch. • Observe the movement of the victim's chest and abdomen.
When to stop mechanical ventilation
• Your safety is at risk.
• The victim begins to breathe on his own.
• Another rescuer arrived on the scene
comrade to replace you.
• You are unable to continue due to fatigue.