Atrial fibrillation is a common cardiac arrhythmia, the prevalence of which increases with age. It manifests as palpitations, dizziness, chest tightness, weakness, and in some patients, blackouts and fainting. Patients may experience episodes of atrial fibrillation at home, and are taught how to deal with them below. Action demonstration: Step 1 Rest immediately When a patient has symptoms of panic, shortness of breath and chest tightness at home, first, immediately help the patient sit down and rest, and ask if he or she has a history of hypertension or coronary artery disease. Step 2 Measure blood pressure Secondly, measure the patient’s blood pressure and heart rate. Finally, if the patient’s pulse rate exceeds 100 beats per minute and the blood pressure is significantly elevated, take nitroglycerin and metoprolol under the tongue as prescribed by the doctor. Special tips: 1. If symptoms persist without relief, seek medical attention; 2. If there is no severe hypotension or slow heart rate, start taking metoprolol in small doses and strictly follow medical advice; 3.