I'm not afraid of the KED. Hell, I TEACH the KED. KED does not intimidate me at all. I'm looking at it this way... history of seizures, ALOC, the patient COULD be postictal or interictal. And since the OP didn't mention anybody else in the residence, I'm guessing the fall was unwitnessed, so we don't know if the ALOC is related to the patient's seizure disorder, to the patient hitting his head, or to neither. OP didn't mention any CVA symptoms, no diabetic history, no smell of ETOH on his breath, and I'm hoping the patient has a patent airway and is breathing adequately otherwise we wouldn't be worrying about immobilization yet. So I would assume that patient could seize (again) at any time. I'd rather go with the LSB, which takes a minute and a half to apply, than the KED, which would take 2-3 minutes. While the extrication is not time-sensitive, immobilization is. Correct me if I'm wrong, but I'm pretty sure that a non-immobilized patient seizing with a possible spinal injury would generally be considered a bad thing. Plus, LSB by itself would be more comfortable than KED and LSB. And if the patient IS secured to the LSB appropriately, sliding shouldn't be a problem... I guess it depends how good you are at immobilization.