The emergency care measures for acute left heart failure are as follows: 1. Monitor patients with acute left heart failure throughout the whole process, focusing on heart rate, blood pressure, pulse rate, arterial oxygen saturation, etc. 2. Place the patient in the correct nursing position, with the patient in a sitting position and legs down. 3. The patient should be relaxed as much as possible to avoid tension and anxiety, which may increase myocardial oxygen consumption and aggravate acute left heart failure. 5.