Arrhythmias, CardiacCircadian RhythmHeartElectrocardiographyMyocytes, CardiacHeart RatePacemaker, ArtificialHeart ArrestAtrial FibrillationMyocardiumHeart Conduction SystemPolydioxanoneElectrocardiography, AmbulatoryElectric CountershockCardiopulmonary ResuscitationOut-of-Hospital Cardiac ArrestCardiac OutputCardiac Pacing, ArtificialFetal HeartDefibrillators, ImplantableModels, CardiovascularMyocardial ContractionTime FactorsCardiomegalyHeart FailureVentricular FibrillationEquipment SafetySinoatrial NodeHeart Defects, CongenitalHeart VentriclesAnti-Arrhythmia AgentsBradycardiaTachycardiaCardiomyopathy, DilatedCardiomyopathiesHeart DiseasesEchocardiographyBlood PressureHemodynamicsTreatment OutcomeCardiac Surgical ProceduresTroponin IMice, KnockoutVentricular FunctionDeath, Sudden, CardiacProspective StudiesVentricular RemodelingMice, TransgenicVentricular Function, LeftSarcomeresStroke VolumeMice, Inbred C57BLRetrospective StudiesFibrosisMuscle ProteinsPeriodicityBiological ClocksDogsSuprachiasmatic NucleusCalciumUltrasonography, PrenatalCardiac TamponadeCardiac CatheterizationDiastolePeriod Circadian ProteinsDisease Models, AnimalPhenotypeCircadian Rhythm Signaling Peptides and ProteinsGene Expression Regulation, DevelopmentalActivity CyclesSleep Disorders, Circadian RhythmPhotoperiodCells, CulturedPregnancyCircadian ClocksMutationRNA, MessengerMyoblasts, CardiacGestational AgeCardiac Imaging TechniquesCLOCK ProteinsAlpha RhythmCardiac MyosinsSignal TransductionCardiac GlycosidesHeart AtriaSarcoplasmic ReticulumTranscription FactorsCardiac Output, LowPhosphorylationCardiac VolumeHeart TransplantationMyocardial InfarctionARNTL Transcription FactorsMolecular Sequence DataRats, Sprague-DawleyCardiac Resynchronization TherapyHeart Function TestsVentricular Dysfunction, LeftCardiac Electrophysiology