Train driver Andy, 48, is rushed in after falling 12ft from a tree while cutting branches and landing on his feet, badly fracturing both ankles, and doctors are concerned the impact may have caused life-changing damage to critical nerves and blood vessels in his feet and legs. Angela, 59, has come to St George's as her heart has been beating at over 150bpm for eight hours, risking stroke and other complications. Cardiologist Dr Arun's attempts to bring down her pulse using a powerful drug aren't successful, so he decides to electrically shock her heart to reset it.