In a patient with acute stroke/ICH/SDH/hyperammonemia at risk for rebound edema with new onset renal failure, do you prefer CRRT versus low and slow HD?  

In the acute period (first 72-96 hours after ictus), my personal preference is CRRT due to the theoretical advantage of hourly titration of ultrafiltrate. I don't know if it really matters though. As for the frequency of laboratory evaluations, I don't find more frequent than q4 hours to be useful, ...