Hmmm, interesting thread. I agree that sometimes you can have too much of a good thing but in other circumstances a patient may look like they are fine but really at a cellular level they aren't. I think it requires a solid knowledge base and thinking skills to know when and how much oxygen...
Sounds like vasovagal phenomena related to a GI bleed. Vasovagal phenomena can be a non-specific symptom of upper GI bleeds. This guy has some liver disease which puts him at high risk for bleeding. The fact that he responded well to some fluid supports a hypovolemic hypotension...
When you give report and hand off care at a hospital do you continue to document everything the hospital does? The same applies to turning over care to a Flight crew or anytime you are turning over care to an equal or higher level of care. Once you have given report and they have assumed care...