A British woman is implanted with the world's first microcomputer in her heart – giving a warning to doctors if her condition worsens. Margaret McDermott of Birmingham participates in a clinical trial in the UK aimed at improving the care of people with heart failure. She said the device implanted in the left atrium is a "miracle" that has already changed her quality of life since she underwent surgery in July. Experts said the technology could prove a "game changer" and save tens of millions of pounds on the NHS by keeping patients healthy and out of hospitals. The Remote Charge Wireless Monitor allows doctors to track patients with heart failure who …