Sinoatrial NodeVena Cava, SuperiorSuperior Vena Cava SyndromeHeart Conduction SystemElectric StimulationSinoatrial BlockVena Cava, InferiorHeart AtriaTachycardia, Sinoatrial Nodal ReentryVenae CavaeLymph NodesAtrioventricular NodeBiological ClocksBrachiocephalic VeinsBradycardiaAzygos VeinAction PotentialsAtrial FunctionHeart RateRabbitsArrhythmia, SinusVena Cava FiltersHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsModels, CardiovascularVagus NerveSick Sinus SyndromeVascular MalformationsPhlebographyElectrophysiologyDogsCoronary SinusElectrocardiographyCyclic Nucleotide-Gated Cation ChannelsPacemaker, ArtificialCardiac Pacing, ArtificialCatheterization, Central VenousImpulse Control DisordersHeartAtrial Function, RightHeart BlockMembrane PotentialsCalcium Channels, L-TypeConnexinsPotassium ChannelsPulmonary VeinsCalcium Channels, T-TypeConnexin 43Tachycardia, SinusIon ChannelsCatheter AblationIsoproterenolJugular VeinsTime FactorsElectrophysiologic Techniques, CardiacMicroelectrodesPatch-Clamp TechniquesMyocytes, CardiacArrhythmias, CardiacTachycardia, SupraventricularHeart Bypass, RightLymph Node ExcisionMediastinal DiseasesMyoblasts, CardiacMediastinal NeoplasmsGuinea PigsAminophyllineTomography, X-Ray ComputedAtrial FibrillationElectrophysiological PhenomenaDelayed Rectifier Potassium ChannelsAdrenergic beta-AgonistsSubclavian VeinComputer SimulationBenzazepinesSodium ChannelsSentinel Lymph Node BiopsyAcetylcholineAutonomic Nervous SystemCardiac MyosinsAnti-Arrhythmia AgentsCalciumCardiotonic AgentsHeart VentriclesRyanodineSuperior ColliculiDevice RemovalParasympathetic Nervous SystemIncidental FindingsAging, PrematureHeart Defects, CongenitalSarcoplasmic ReticulumSodium-Calcium ExchangerCardiovascular AbnormalitiesNatriuretic Peptide, C-TypeAtropineConstriction, PathologicTreatment OutcomeMyocardial ContractionCalcium SignalingChylothorax