Rare type of ventricular tachycardia , characterized by a gradual change in amplitude and twisting of the QRS complexes around an isoelectric line on the electrocardiogram, which can be life threatening .
Acting quickly can save lives. If given quickly after symptoms, clot-busting and artery-opening medications can stop a heart attack, and having a catheterization with a stent put in may open a closed blood vessel. The longer you wait for treatment, the more chances of survival go down and damage to the heart goes up.
If your heart rate is consistently above 100 beats per minute or below 60 beats per minute (and you're not an athlete) and if you are experiencing any symptoms such as dizziness, palpitations, chest pain, breathlessness then you may need to visit a hospital.