Heart VentriclesMyocardiumHeartCell WallHeart RateCerebral VentriclesThird VentricleFourth VentricleHeart FailureLateral VentriclesHeart Defects, CongenitalCerebral Ventricle NeoplasmsHeart DiseasesHeart TransplantationFetal HeartHeart AtriaMyocardial ContractionVentricular FunctionHeart ValvesThoracic WallAbdominal WallVentricular Function, LeftHemodynamicsDogsHeart BlockEchocardiographyHeart SeptumTime FactorsHeart Function TestsEndocardiumMyocytes, CardiacCardiomegalyStroke VolumeVentricular Function, RightMyocardial IschemiaModels, CardiovascularVentricular Remodeling