Heart VentriclesMyocardiumHeartHeart RateCerebral VentriclesThird VentricleFourth VentricleHeart FailureHeart Defects, CongenitalLateral VentriclesHeart DiseasesCerebral Ventricle NeoplasmsHeart TransplantationFetal HeartTreatment OutcomeHeart AtriaPostoperative ComplicationsHeart ValvesTime FactorsMyocardial ContractionCardiac Surgical ProceduresBariatric SurgeryVentricular FunctionRetrospective StudiesProspective StudiesFollow-Up StudiesHemodynamicsThoracic SurgeryVentricular Function, LeftGeneral SurgeryEchocardiographyHeart BlockDogsPostoperative PeriodHeart Arrest, InducedHeart Function TestsHeart SeptumStroke VolumeMyocardial IschemiaMyocytes, CardiacCardiomegalyVentricular Function, RightEndocardiumRisk FactorsVentricular Dysfunction, LeftMyocardial Infarction