Heart Conduction SystemArrhythmias, CardiacElectrocardiographyBundle-Branch BlockCardiac Pacing, ArtificialTocainideHeart BlockNeural ConductionAtrioventricular NodeBundle of HisPacemaker, ArtificialCerebral VentriclesInjections, IntraventricularTachycardia, VentricularTachycardiaCardiomyopathy, DilatedHeart VentriclesCardiac Resynchronization TherapyHeart FailureCerebral HemorrhageVentricular Function, LeftDogsHeart RateHeartVentriculostomyCerebral Ventricle NeoplasmsHydrocephalusCerebral VentriculographyInfant, Premature, DiseasesBipolar DisorderInfusions, IntraventricularLateral VentriclesIntracranial HemorrhagesMental DisordersNeuroendoscopyInfant, NewbornAnxiety DisordersMood DisordersInfant, PrematureEchoencephalographyLeukomalacia, PeriventricularAction PotentialsDiagnostic and Statistical Manual of Mental DisordersBone ConductionThird VentricleMedian NerveNeurocytomaTime FactorsMeningeal NeoplasmsElectrophysiologyRefractory Period, ElectrophysiologicalDepressive Disorder, MajorCerebrospinal Fluid ShuntsGestational AgeInfant, Very Low Birth WeightUlnar NerveBrainAttention Deficit Disorder with HyperactivityTreatment OutcomeHeart AtriaPeripheral NervesMagnetic Resonance ImagingDepressive DisorderElectrophysiologic Techniques, CardiacInjectionsGlioma, SubependymalTomography, X-Ray ComputedVentricular FunctionAtrioventricular BlockObsessive-Compulsive DisorderFourth VentricleVentricular DysfunctionStress Disorders, Post-TraumaticAutistic DisorderCerebrospinal FluidTibial NerveElectrodiagnosisAxonsElectric StimulationSubarachnoid HemorrhageModels, CardiovascularAphasia, ConductionAtrial FlutterSural NerveVentricular PressureInfant, Newborn, DiseasesPhobic DisordersPeripheral Nervous System DiseasesPurkinje FibersIntracranial PressureRetrospective StudiesChild Development Disorders, PervasivePsychotic DisordersDevelopmental DisabilitiesSubstance-Related DisordersSinoatrial NodeHyaline Membrane DiseaseProspective StudiesSeverity of Illness IndexCatheter Ablation