You bring your mother to a Queens emergency room in Flushing or Jamaica because her speech suddenly slurred and her left arm went limp in the middle of dinner. A resident checks her vitals, chalks it up to a migraine, and parks her in a hallway bed for four hours. By the time anyone orders a CT scan, the window for the clot-busting drug tPA has closed — and she'll never walk without assistance again. ER stroke misdiagnosis in New York is one of the most devastating forms of m