Pacemaker, ArtificialAtrial FibrillationAnti-Arrhythmia AgentsDefibrillators, ImplantableArrhythmias, CardiacCircadian RhythmElectrocardiographyHeart RateHeart ArrestPolydioxanoneHeartElectrocardiography, AmbulatoryElectric CountershockCardiopulmonary ResuscitationOut-of-Hospital Cardiac ArrestHeart Conduction SystemMyocytes, CardiacCardiac Pacing, ArtificialVentricular FibrillationTime FactorsEquipment SafetyTreatment OutcomeSinoatrial NodeBradycardiaTachycardiaCardiac OutputModels, CardiovascularHeart FailureDisease ManagementProspective StudiesCardiac Surgical ProceduresDeath, Sudden, CardiacRetrospective StudiesBlood Pressure