For children, the CPR ratio is still 15:2 for healthcare professionals. The guidelines do change based on the evidence available and professional consensus opinion. It is accepted that the evidence is weak, but it's a best "guess". The key point is to do chest compressions. For those that are really interested: https://www.anzcor.org/
On a more philosophical note, I question the expectations associated with CPR in remote areas where help is many hours away, especially where the primary cause of cardiac arrest is non-cardiac (e.g. haemorrhage secondary to a gunshot wound). Definitely do it as you have nothing to lose, but don't expect a good outcome.
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