Premature atrial contractions.These are early extra beats that start in the heart’s upper chambers, called the atria.
Premature ventricular contractions(PVCs). These are among the most common arrhythmias. They’re the “skipped heartbeat” we all occasionally feel. sometimes, PVCs can be caused by heart disease or electrolyte imbalance. If you have a lot of PVCs, or symptoms linked to them, call your cardiologist.
Atrial fibrillation. This common irregular heart rhythm causes the upper chambers of the heart to contract abnormally.
Paroxysmal supraventricular tachycardia (PSVT).A rapid heart rate, usually with a regular rhythm, starting from above the heart’s lower chambers, or ventricles.
Accessory pathway tachycardias. A rapid heart rate because of an extra pathway between the heart’s upper and lower chambers.
AV nodal reentrant tachycardia. A rapid heart rate because of an extra pathway through a part of the heart called the AV node. It can cause heart palpitations, fainting, or heart failure.
Ventricular tachycardia (V-tach).A rapid heart rhythm starting from the heart’s lower chambers. Because the heart is beating too fast, it can’t fill up with enough blood. This can be a serious arrhythmia — especially in people with heart disease.
Ventricular fibrillation.This happens when the heart’s lower chambers quiver and can’t contract or pump blood to the body. This is a medical emergency.
Long QT syndrome.This may cause potentially dangerous arrhythmias and sudden death.
These are slow heart rhythms, which may be due to disease in the heart’s electrical system.
Sinus node dysfunction.This slow heart rhythm is due to a problem with the heart’s sinus node.
Heart block.There is a delay or a complete block of the electrical impulse as it travels from the heart’s sinus node to its lower chambers. The heart may beat irregularly and, often, more slowly.