Very different here to the USA. DNR and ICU admission is a medical decision- there will usually be a discussion with the family, but with the clear understanding that decisions are made on a medical basis by the medical team on the basis of the patient’s best interest.
ICU is almost certainly out of the question for anyone with a chronic, terminal condition, and usually to anyone over 80.
Dementia patients don’t go to ICU.
Stroke patients (unless they require ventilation or have been thrombolysed) won’t go to ICU.
I worked in a hospital that had over 100 medical beds, about 75 surgical beds and a reasonable sized OB/Gyn department.
It has a 6 bed ICU, a 6 bed CICU, a 12 bed coronary care step down unit, and a 6 bed respiratory step down unit. Patients spend a long time in the high dependncy beds so they are always in demand.
Trauma, neuro, ortho, renal and oncology went to the regional tertiary centre- so basically we got asthma, COPD, diabetes, heart disease, infectious diseases and strokes- and the cancer patients when the oncologists have decided that further active treatment is futile.
Our typical ICU patient was a deliberate overdoser, a diabetic in a coma, a person with liver failure waiting in vain for a transplant or a young person with a severe pneumonia. Mostly young, with acute, potentially reversible issues.
You had a heart attack, you got lysed or cathed and sent to CICU, you have COPD you had CPAP on the respiratory ward. Our ICU was reserved for the “worst of the worst”. If you were in our ICU you were almost certainly needing at least two out of three of intubated and ventilated, dialysis and cardiac monitoring- with a reasonable chance of recovery (i.e. no-one on the medical staff willing to DNR you…yet).