Fetal HeartHeart Rate, FetalHeartFetal MonitoringCardiotocographyEchocardiographyHeart RateHeart Defects, CongenitalUltrasonography, PrenatalHypertrophyEchocardiography, Four-DimensionalFetal MovementGestational AgeFetal DiseasesHeart FailureFetal DistressFetal HypoxiaHeart DiseasesUmbilical ArteriesEchocardiography, Three-DimensionalFetusHeart AtriaElectrocardiographyHeart NeoplasmsHeart MurmursHeart BlockCanrenoic AcidEchocardiography, Doppler, ColorEchocardiography, TransesophagealPregnancy Trimester, SecondMyocardiumHeart VentriclesMagnetocardiographyUltrasonography, DopplerHeart TransplantationProspective StudiesVentricular Dysfunction, LeftPregnancy Trimester, ThirdEchocardiography, DopplerHeart ValvesPregnancy Trimester, FirstLabor, ObstetricCardiomyopathiesHeart SeptumCardiac VolumeInfant, NewbornVentricular Function, LeftMyocardial ContractionHemodynamicsBradycardiaPericardial EffusionBlood Flow VelocityEchocardiography, StressSensitivity and SpecificityPregnancy OutcomeMiosisCardiomegalyStroke VolumeFetal DevelopmentCardiomyopathy, DilatedAbortion, ThreatenedFollow-Up StudiesHeart Septal Defects, VentricularHypertrophy, Left VentricularTime FactorsPrenatal DiagnosisMyxomaPredictive Value of TestsMaternal-Fetal ExchangeCardiomyopathy, HypertrophicExercise TestSheepMyocardial InfarctionVentricular DysfunctionSystoleApgar ScoreRisk FactorsMyocardial IschemiaMyocytes, CardiacDiastoleFetal Growth RetardationMitral ValveReproducibility of ResultsCardiac CatheterizationHeart Septal Defects, AtrialPerinatologyCrown-Rump LengthPhonocardiographyEndocarditis, BacterialCoronary DiseaseReproducibility of ResultsTakotsubo CardiomyopathyElectronics, MedicalHeart AneurysmPregnancy ComplicationsAnalgesia, ObstetricalPericarditisHypothalamic DiseasesCardiotonic AgentsMitral Valve Insufficiency