Abbreviations
ARDS: Acute respiratory distress syndrome; ASE: American society of echocardiography; AV: Aortic valve velocity; COVID-19: Coronavirus disease 2019; EDV: End-diastolic volume; ESV: End-systolic volume; HR: Heart rate; ICU: Intensive care unit; ICV-CI: Inferior vena cava collapse index; IVC: Inferior vena cava;IVCmax: Maximum diameter of the inferior vena cava; IVCmin: Minimum diameter of the inferior vena cava; LVEDD: Left ventricular end-diastolic dimension; LVEF: Left ventricular ejection fraction; MAP: Mean arterial pressure; PAD: Diameter of pulmonary artery; PASP: Pulmonary arterial systolic pressure; RAD: Right atrial diameter; RV: Right ventricular; RVD: Right ventricular diameter; RVOT: Right ventricular outflow tract; SARS-CoV-2: SARS coronavirus 2; SD: Standard deviation; TAPSE: Tricuspid annular plane systolic excursion; TRPG: Tricuspid valve regurgitation pressure gradient biggest.