This is a common symptom in patients with an alteration in heart rhythm. When the heartbeat becomes irregular, the volume of blood being pumped off the heart becomes altered, and there’s an inconsistency in the blood load in the heart. In other words, the heart would suddenly feel there’s temporary excess blood and would pump harder to overcome the problem. This is perceived as if the heart was going into a wild beating or as if it was about to come out of the chest.
Heart rhythm problems are deeply associated with hypertension because high blood pressure makes the heart work double, and may activate a defective or diseased peacemaker in the heart.