First aid L1 The standard course

Chain of survival

Surviving a stopped heart depends on a chain — early call, early CPR, early shock, hospital care — and the chain is only as strong as its weakest link.

You need first

Calling emergency services L0
Signs of life L0

This unlocks

Using a defibrillator L1
CPR L2
Directing bystanders L3

Answered by

Stopping resuscitationL5
Comfort care when nobody is comingL5

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No readings anchored yet.

This concept is mapped but not yet sourced. Shown honestly rather than padded with a plausible-looking reading list.