GREY'S ANATOMY - "Stairway to Heaven" - Bailey grows desperate as a patient's condition becomes more and more dire. Everyone in the hospital is stepping up to try to find the boy a new organ donor, including Meredith, who considers a death row patient's wish to die before execution. Meanwhile, an injury leaves Mark in a compromising position in the OR and Cristina awkwardly avoids Owen, on "Grey's Anatomy," THURSDAY, JANUARY 22 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/CRAIG SJODIN) SANDRA OH