Resuscitation?

DNR, three letters that have far reaching implications within medical care. 
I refer to the term ‘do not resuscitate’; an instruction to withdraw life saving interventions offered to serious or terminally ill patients; or in some circumstances where the patient is not cognoscente; to the next of kin.
My brother and I were faced with that decision when my 85 years old father entered hospital with a number of life threatening issues including Alzheimers who had lapsed into a coma and was unlikely to recover. 
Based on medical advice we agreed that he should not be resuscitated and he was placed on the since defunct Liverpool Care Pathway.
That decision, though upsetting was the correct one based on medical advice however, I have since learned that first responders attending to an elderly patient in a care home who had choked on bacon rind were instructed not to resuscitate her based on a DNR note in her file.
My concern is that this decision was taken outside the protocol of DNR as the medical emergency was not related to her existing state of health; placing persons tasked with lifesaving in an impossible position.
I welcome readers opinion on this subject.