First, make certain there is no carotid bruit, then exclude any history of stroke, TIAs, or amaurosis fugax. If none of these are present apply pressure over the carotid artery at the level of cricoid cartilage for 5 seconds with a firm circular movement. If palpitations continue repeat the procedure on the opposite side. Another vagal stimulant are Valsalva maneuver, applying an ice pack onto the face.