title: A new wave in heart testing. An odd variation on the electrocardiogram could help doctors determine who would get the most benefit from an implanted defibrillator.
mesh_terms: D002118:Calcium / Q000378:metabolism; D017147:Defibrillators, Implantable; D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D009206:Myocardium / Q000378:metabolism; D017180:Tachycardia, Ventricular / Q000175:diagnosis* / Q000628:therapy; D014693:Ventricular Fibrillation / Q000175:diagnosis* / Q000628:therapy
chemical_list: D002118:Calcium