Firstly, when the cardiac arrest comes, no amount of resuscitation attempts are going to provide a good outcome. You can’t resuscitate a corpse. Secondly, whatever happens from now onwards Hollie is going to claim that the hospital killed Archie. No amount of reasoning will make her think otherwise. For this reason alone I think a post-mortem will have to be carried out. Possibly even two as the family will not trust the outcome unless they choose, and fund, their own pathologist.