If the patient has palpitations before going to sleep, it is likely that the patient is suffering from cardiac neurosis or disorders of vegetative nervous system. It is recommended that the patient undergoes an ambulatory electrocardiogram if necessary, which will help to clarify the presence of myocardial ischemia and arrhythmia during the onset of palpitations. Other patients may have premature beats, such as atrial premature, ventricular premature, or paroxysmal atrial fibrillation. Some patients may have abnormal thyroid function, anemia, ion disorders, and are relatively more likely to have such abnormalities, and patients are advised to have their blood and serum ions and thyroid function checked if necessary. Clonidine tablets.