diltiazem; endogenous compound; epinephrine; metoprolol; milrinone; noradrenalin; phenylephrine; protein c jun; vasopressin; adverse drug reaction; aged; atrial fibrillation; blood pressure; cardiogenic shock; case report; chronotropism; clinical article; clinical decision making; conference abstract; coronavirus disease 2019; drug therapy; echography; electric activity; electrocardiogram; electrocardiography; emergency ward; female; heart arrhythmia; heart atrium flutter; heart catheterization; heart ejection fraction; heart output; heart palpitation; heart rate; human; hyperemia; internal medicine; intubation; lung edema; male; physical examination; physician; point of care ultrasound; prevention; pulmonary artery occlusion pressure; resident; resuscitation; return of spontaneous circulation; side effect; tachycardia; thorax radiography; transthoracic echocardiography; very elderly; watershed