Chest PainAngina PectorisMyocytes, CardiacCardiac OutputChest TubesHeartCardiac Surgical ProceduresArrhythmias, CardiacRadiography, ThoracicDeath, Sudden, CardiacThoracic WallCardiac TamponadeHeart DiseasesThoraxCardiomegalyCardiac Pacing, ArtificialMass Chest X-RayHeart ArrestCardiac CatheterizationThoracic InjuriesMyocardiumFlail ChestElectrocardiographyMyocardial ContractionHeart VentriclesTime FactorsHeart FailureMyocardial InfarctionEchocardiographyCardiopulmonary ResuscitationCardiomyopathiesMyoblasts, CardiacTomography, X-Ray ComputedThoracic NeoplasmsOut-of-Hospital Cardiac ArrestHeart MassageCardiac MyosinsCardiac Imaging TechniquesHeart RateHemodynamicsCardiac GlycosidesTroponin ITreatment OutcomeCardiac Output, Low