“…Identification of the cause of nontraumatic hypotension GDE [16] The parasternal long and short axis, apical 4-chamber plane, subcostal inferior vena cava, and other planes Left and right ventricle pump function, pericardial effusion, septal dynamics, valvular disease, and fluid responsiveness RUSH [17] Parasternal long and short axis, subxiphoid 4-chamber plane and apical 4-chamber plane, the diameter of the inferior vena cava/internal jugular vein, respiratory variation index, and the aorta and deep venous system Rapid evaluation of shock patients and determination of the cause THIRD [19] Pericardial effusion, 5 groups of indicators related to the heart, 3 groups of indicators related to the inferior vena cava and lung, deep vein thrombosis, or aortic dissection Identification of obstructive shock (pericardial tamponade, tension pneumothorax, pulmonary embolism, and pulmonary hypertension), hypovolemic shock (hemorrhagic shock, aortic aneurysm, and aortic dissection), cardiogenic shock (acute myocardial infarction and heart failure), and distributive shock (including septic shock only) Etiology assessment of cardiac arrest FEEL [20] and FEER [22] Subxiphoid 4-chamber plane, parasternal long and short axis, apical 4-chamber plane Identification of the reversible cause of cardiac arrest, accurate identification of ventricular fibrillation, and identification of PEA Assessment of Acute trauma FAST, [24] EFAST, [18] r-EFAST, [26] and FASTER [27] Perihepatic, pelvic, and pericardial Determination of occult abdominal hemorrhage, pericardial effusion, and pneumothorax BEAT [28] The parasternal long-axis plane, the parasternal short-axis plane and apical 4-chamber plane Used for bedside cardiac function assessment of trauma or critical patients Combined with advanced technologies, such as artificial intelligence, it will play an increasingly important role in saving patients with critical illnesses.…”