Heart VentriclesMyocardiumHeartHeart RateAnterior ChamberCerebral VentriclesThird VentricleFourth VentricleHeart FailureLateral VentriclesHeart Defects, CongenitalCerebral Ventricle NeoplasmsHeart DiseasesFetal HeartHeart AtriaHeart TransplantationMyocardial ContractionHeart ValvesDiffusion Chambers, CultureVentricular FunctionVentricular Function, LeftEchocardiographyHeart BlockDogsHemodynamicsTime FactorsAtmosphere Exposure ChambersMyocytes, CardiacHeart Function TestsHeart SeptumCardiomegalyStroke VolumeEndocardiumVentricular Function, RightVentricular Dysfunction, LeftMyocardial IschemiaCardiomyopathy, DilatedVentricular Remodeling