systolic heart failure Adult 1 Animals 1 Article 1 COVID-19 serological testing 1 Cardiology 1 Cardiomegaly 1 Disease Models, Animal 1 Dogs 1 Doppler 1 Dyspnea 1 Early diastolic fillings 1 Echocardiography 1 Emergency Service, Hospital 1 Endoscopy 1 Failure model 1 Female 1 Filling 1 Filling pressure 1 Filling pressures 1 Heart 1 Heart Failure, Systolic 1 Heart failure 1 Hoarseness 1 Humans 1 Imaging, Three-Dimensional 1 Left ventricular filling pressure 1 Malalignment 1 Male 1 Myocardial strain 1