2008n-740 2009a-234 arrhythmia arrhythmias artificial artificialcardiacpacing artificialpacemaker automatedexternaldefibrillation bioelectricenergysources cardiac cardiacpacing cardiopulmonaryresuscitation cardiovascularinstruments coronarydisease coronaryheartdisease cpr(firstaid) defibrillators diseases electricproperties electrophysiology electrotherapeutics emergencies emergencymedicine firstaid firstaidinillnessandinjury heart implantable implantabledefibrillators implanted medical medicalemergencies myocardialinfarction nursing pacemaker paramedicalservices rd598c3422009 reference therapy treatment ventricularfibrillation wg168c26172009 wg168c26652008 wg300a18691982