Sorry! A repeat head CT probably isn't actually going to be very helpful for us, at least at this stage. At least, there is one other test that is a strong predictor of a poor neurologic prognosis if present, unlike a head CT. We should generally try to identify if there are any strong predictors first. Absence of pupillary light reactivity at this time point is one of the two strong predictors; not applicable for this patient here. If we end up completing these two tests and neither point towards a poor prognosis, then it'd be reasonable to get this CT, acknowledging that there's greater uncertainty with it. Specifically, we'd be looking for diffuse anterior and posterior circulation territory signs of ischemia, including cortex and deep gray matter, with loss of gray-white differentiation and sulcal effacement. If present, then this would be a moderate predictor of a poor neurologic prognosis at 3 months, again with greater uncertainty than with the strong predictors. In that case, it'd be a good idea to invoke multimodal testing and obtain additional data points to corroborate this due to the greater level of uncertainty.
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