@UMDNeurosurgery's Dr. Aldrich post hoc analysis shows thick (≥ 4mm) and diffuse (≥ 3 basal cisterns) SAH independently predicts vasospasm-related morbidity and poor 12-wk outcomes. thejns.org/view/journals/…
@claassen_jan used Hijdra grade 3 (completely fills a cistern) to define "thick blood" in Fisher scale revisited paper + showed additive effect of b/l IVH. ahajournals.org/doi/10.1161/hs…
Dr. Jen Frontera, using data from tirilazad RCTs, showed that thick blood and IVH predict symptomatic vasospasm, but did not have explicit definitions for thin/thick and scored IVH as simply present/absent.pubmed.ncbi.nlm.nih.gov/16823296/
We found that there is confusion around these scales as many neuro-intensivists operationalize these variables differently. link.springer.com/article/10.100… 
No one has thought more about this than @stephanamayer (who was author on papers by Aldrich, Claassen, and Frontera). How do we move forward? Dichotomize thick/diffuse vs. others? Include IVH (which was not included in Aldrich's model)? Important for enriched study design...
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