More than a decade ago, a new approach to treating an acute stroke was developed that involved administering tPA within 3-4 hours of the onset of an acute ischemic stroke. tPA dissolves a clot and restores circulation, resulting in a dramatic patient recovery. Where tPA was effective, most patients were able to resume their lives rather than being permanently disabled with paralysis and/or neurological loss. The issue with administering tPA is that not all strokes are caused by a blood clot; sometimes the strokes are caused by a hemorrhage into the brain. If tPA is given to these patients the stroke is made worse. The standard of care in most jurisdictions, is that a...