Symptoms

Heart arrhythmias may not cause any signs or symptoms. A doctor may notice the irregular heartbeat when examining you for another health reason.

In general, signs and symptoms of arrhythmias may include:

• A fluttering in the chest
• A racing heartbeat (tachycardia)
• A slow heartbeat (bradycardia)
• Chest pain
• Shortness of breath

Other symptoms may include:

• Anxiety
• Fatigue
• Lightheadedness or dizziness
• Sweating
• Fainting (syncope) or near fainting

When to see a doctor

If you feel like your heart is beating too fast or too slowly, or it's skipping a beat, make an appointment to see a doctor. Seek immediate medical help if you have shortness of breath, weakness, dizziness, lightheadedness, fainting or near fainting, and chest pain or discomfort.

A type of arrhythmia called ventricular fibrillation can cause a dramatic drop in blood pressure. Collapse can occur within seconds and soon the person's breathing and pulse will stop. If this occurs, follow these steps:

• Call 911 or the emergency number in your area.
• If there's no one nearby trained in cardiopulmonary resuscitation (CPR), provide hands-only CPR. Push hard and fast on the center of the chest at a rate of 100 to 120 compressions a minute until paramedics arrive. You don't need to do rescue breathing.
• If you or someone nearby knows CPR, start CPR. CPR can help maintain blood flow to the organs until an electrical shock (defibrillation) can be given.
• If an automated external defibrillator (AED) is available nearby, have someone get the device and follow the instructions. An AED is a portable defibrillation device that can deliver a shock that may restart heartbeats. No training is required to operate an AED. The AED will tell you what to do. It's programmed to allow a shock only when appropriate.