The ending almost reads like satire. He was picturing a happy, smiling liver and wonders whether it was that positive visualization or the massive doses of penicillin that did the trick? It’s like something from the Onion.
Long story short, there definitely is something to your mental game in a situation like this.
It's a smaller effect than the others, but it's there.
https://en.wikipedia.org/wiki/Afterdrop
I'm not sure if there is consensus on this but the adivce I was given for rescue scenarios is to keep the patient tense. Raising voice at them, increasing stress, telling them they are still in danger and need to keep fighting.