I can think of three reasons why the neuro exam was repeated. One is a good reason, one is a bad reason, but happens a lot and the last is very situational.
1)
Neuro exams change management. Exams be them CTs or neuro exams are snapshots of the patient and are only valid at the time they are performed. One can guess as to what is going on by knowing the natural progression of a particular pathology (in this case SAH), but you really don't know. What exactly the neuro exam shows dictates OR vs trauma bay intervention vs NICU. In the end it is a judgement call. I'll be the first to admit that I am not up to date on the most current management of acute SAH. I know enough to get by, but I'm going to defer to NSGY or the stroke team every time. No question, they make mistakes from time to time like the rest of us, but their job is to evaluate neuro function and depriving them of their basic tool (neuro exam) is pretty hard for them to compute. Most doctors, especially surgeons (in my experience) need to see to believe. They NEED to read their own films. They NEED to perform their own exams. The reason I do that is a) to learn but also b) because people make mistakes and on average are not nearly as anal as I am about doing things a particular way.
2)
They will get yelled at by their attending for not doing their own exam. You can't tell a NSGY attending, "Well the ED resident says the neuro exam was XYZ." Even if you replace ED resident with ED attending, most people will simply not trust them based on their position. This is entirely institution and community dependent, but most residents (again, especially surgery residents) learn very quickly to check and recheck things for fear of being asked something by your attending.
3)
Neuro exams evolve. Continuation of #1. If that exam was performed 30 minutes or an hour ago, with the patient intubated/sedated, you really don't have a good gauge for what is going on. If he JUST got the sedation as the NSGY resident walked in, it is silly to do the exam for sure. But again, not knowing the details of management, I don't know if q15min or q30min vs q1h neuro checks are important.
We would have to ask a NSGY resident/attending to justify repeating the exam when they did. I can't really comment on that specifically, which is unfortunate because that is the root of your question
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