signs of a fast heart rate
When your heart's rate is too rapid, it may not effectively pump blood to the rest of your body, depriving your organs and tissues of oxygen. This can cause these tachycardia-related signs and symptoms: 1  Dizziness. 2  Shortness of breath.3  Lightheadedness. 4  Rapid pulse rate.5  Heart palpitations â a racing, uncomfortable or irregular heartbeat or a sensation of flopping in the chest. 6  Chest pain.hen your heart's rate is too rapid, it may not effectively pump blood to the rest of your body, depriving your organs and tissues of oxygen. This can cause these tachycardia-related signs and symptoms: 1  Dizziness. 2  Shortness of breath.