I’m a consultant in intensive care and do this stuff regularly. It is absolutely right that all patients are deemed to have capacity until proven otherwise. Capacity is assessed by being able to understand, retain, weigh up and communicate a decision, a believe me, we go to great lengths to ensure that an individual has a chance of being labelled with capacity. We also deeply respect decisions of autonomous patients with capacity, even if we personally or professionally don’t agree. It is probable that this patient did not have capacity based upon the severity of his hypoxia. Even if he did have capacity, I want to stress that with those saturation’s, he would be unlikely to reach the end of the ward corridor, let alone the entrance to the hospital or home, before he had a respiratory, then cardiac arrest. If he did have capacity to decide that he wanted to leave but medical staff felt it was a genuine risk to his life, emergency legal advice would be sought and usually, the advice is to act in the patients best interests... in this scenario, to keep on oxygen and not to let him stagger down the corridor until he dies.
Horrible situation for all the staff. Equally wondering why security weren’t able to detain that man until police arrived.