DigoxinCircadian RhythmHeartHeart RateArrhythmias, CardiacDefibrillators, ImplantableAtrial FibrillationEuropePacemaker, ArtificialCardiologyAnti-Arrhythmia AgentsSocieties, MedicalElectrocardiography, AmbulatoryFractalsElectrocardiographyCardiac Imaging TechniquesCardiac Pacing, ArtificialElectric CountershockHeart FailureHeart Conduction SystemCatheter AblationDevice RemovalDigitoxinCardiotonic AgentsSignal Processing, Computer-AssistedCardenolidesHeart DiseasesHealth Care SurveysCardiac Resynchronization TherapyCardiac GlycosidesHeart TransplantationTreatment OutcomeHeart Defects, CongenitalDeath, Sudden, CardiacTachycardia, VentricularHeart AtriaMedigoxinPractice Guidelines as TopicFetal HeartPeriodicityHeart BlockPhysician's Practice PatternsBiological ClocksEleutherococcusSuprachiasmatic NucleusRisk FactorsTime FactorsHeart ValvesPeriod Circadian ProteinsMyocardiumDigitalis GlycosidesCircadian Rhythm Signaling Peptides and ProteinsDrug InteractionsActivity CyclesMyocardial ContractionNeriumSleep Disorders, Circadian RhythmPhotoperiodRadioimmunoassayOuabainCircadian ClocksCLOCK ProteinsQuinidineHemodynamicsAlpha RhythmDogsHeart Arrest, InducedHeart Function TestsP-GlycoproteinCardiac Output, Low