Heart stops beating effectively. Patient is unconscious, unresponsive, and not breathing normally. Immediate CPR is required.
Step-by-Step Guidance
Shake shoulders and shout 'Are you okay?'. If no response and not breathing, call 999 and get an AED.

Place heel of one hand on center of chest, other hand on top. Push hard and fast (100-120 bpm, 2-2.4 inches deep).

Tilt the head back slightly and lift the chin to open the respiratory pathway.

Pinch nose shut, seal your mouth over theirs, and blow for 1 second. Watch the chest rise. Repeat once.

Repeat the cycle of 30 compressions and 2 breaths. Keep going until paramedics arrive or AED is ready.

Highly critical (emergency room)
Timeline is typical for uncomplicated healing. Always follow doctor guidance.