PuncturesSpinal PuncturePost-Dural Puncture HeadacheMyocytes, CardiacCardiac OutputHeartCardiac Surgical ProceduresArrhythmias, CardiacNeedlesDeath, Sudden, CardiacSepsisCardiac CatheterizationBlood Patch, EpiduralCecumCardiac TamponadeCardiomegalyCardiac Pacing, ArtificialHeart DiseasesAtrial SeptumMyocardiumMyocardial ContractionHeart VentriclesWounds, PenetratingLigationHeart ArrestHeadacheTime FactorsFoot InjuriesCatheterization, PeripheralLarynx, ArtificialTreatment OutcomeMyoblasts, CardiacHeart FailureDura MaterCardiomyopathiesElectrocardiographyEchocardiographyCardiac MyosinsHemostatic TechniquesCardiac Imaging TechniquesHemodynamicsCardiac GlycosidesProspective StudiesHeart RateDisease Models, AnimalCardiac Output, LowAnesthesia, SpinalMyocardial InfarctionOut-of-Hospital Cardiac ArrestFluoroscopyMeningitisCardiac VolumeVentricular RemodelingHeart TransplantationCerebrospinal FluidGloves, SurgicalTroponin IHeart Defects, CongenitalRetrospective StudiesVentricular Function, LeftRats, Sprague-DawleyHeart AtriaBlood PressureDogsStroke VolumeCardiac Resynchronization TherapyHeart Function TestsTroponin TFollow-Up StudiesHeart Conduction SystemCardiopulmonary ResuscitationHeart NeoplasmsCardiac Care FacilitiesUltrasonography, InterventionalJugular VeinsMice, Inbred C57BLFibrosisCardiomyopathy, DilatedVentricular Dysfunction, LeftCardiotonic AgentsPostoperative ComplicationsAnesthesia, EpiduralMyocardial IschemiaCatheterizationCardiac ElectrophysiologyMeningitis, BacterialTomography, X-Ray ComputedModels, CardiovascularFetal HeartHeart SeptumCells, CulturedRadiography, InterventionalBlood Specimen CollectionFemoral ArteryCalciumRisk FactorsElectrophysiologic Techniques, CardiacVentricular FunctionAxillary VeinCatheterization, Central Venous