Atrial fibrillation (AF) refers to atrial fibrillation, caused primarily by organic heart diseases, commonly seen in coronary heart disease, rheumatic heart disease, cardiomyopathy, and pulmonary heart disease, as well as certain metabolic disorders such as hyperthyroidism. Patients with AF can experience impacts on cardiac function, and in severe cases, may develop heart failure. Nursing care primarily involves ensuring the patient rests and avoids excessive fatigue. Mild physical activities can be performed, and it is advisable to eat easily digestible foods and avoid spicy foods to reduce gastrointestinal irritation and lessen the burden on cardiac function. Attention should be paid to sleep, avoiding smoking and alcohol, routinely checking the electrocardiogram (ECG), and seeking timely medical treatment at a hospital if special conditions arise.