Made a point of this regarding my wife's, recovery from 8-hour open heart surgery ... you didn't feel anything, but your body suffered severe trauma.
As a family we're into muscle-memory and the like, and pick up odd snippets here and there, and have experienced curiosities of morphic resonance that defy conventional explanation.
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I watched a vid. some decades ago.
A tough lesson was learned during the Viet Nam war. When things went well, a battlefield casualty could be medivaced (is that the word) by helicopter to a field hospital in short order, so statistically, the US had their casualties in the operating theatre way faster than in previous conflicts.
Why, then, were they losing so many for no explicable reason?
They worked out that the injured combatant suffers trauma from the injury. Then he's anaesthetised, he's on a chopper and subject to more treatment, then he's into a hospital and subject to more ... and it seems that this pile-on of trauma – the initial wound, then almost immediate and somewhat continuous treatment, meant trauma on trauma, with the result the patient died of shock.
Now they treat life-threatening injuries as necessary, but then once stable, delay further invasive treatment to allow the body to recover a bit, before piling in again. Following this procedure, the mortality rate dropped significantly. I think 'induced coma' is a by-product of these learnings.
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