Arrhythmias Overview
Learn About Arrhythmias
An arrhythmia is a disorder of the heart rate (pulse) or heart rhythm. The heart can beat too fast (tachycardia), too slow (bradycardia), or irregularly.
An arrhythmia can be harmless, a sign of other heart problems, or an immediate danger to your health.
Abnormal heart rhythms; Bradycardia; Tachycardia; Fibrillation
Normally, your heart works as a pump that brings blood to the lungs and the rest of the body.
To help this happen, your heart has an electrical system that makes sure it contracts (squeezes) in an orderly way.
- The electrical impulse that signals your heart to contract begins in an area of the heart called the sinoatrial node (also called the sinus node or SA node). This is your heart's natural pacemaker.
- The signal leaves the SA node and travels through the heart along a set electrical pathway.
- Different nerve messages signal your heart to beat slower or faster.
Arrhythmias are caused by problems with the heart's electrical conduction system.
- Abnormal extra signals may occur.
- Electrical signals may be blocked or slowed.
- Electrical signals travel in new or different pathways through the heart.
Some common causes of abnormal heartbeats are:
- Abnormal levels of potassium, magnesium, or other substances in the body
- Heart attack, or a damaged heart muscle from a past heart attack
- Heart disease that is present at birth (congenital)
- Heart failure or an enlarged heart
- Overactive thyroid gland
Arrhythmias may also be caused by some substances or drugs, including:
- Alcohol or stimulant drugs
- Certain medicines
- Cigarette smoking (nicotine)
Some of the more common abnormal heart rhythms are:
- Atrial fibrillation or flutter
- Atrioventricular nodal reentry tachycardia (AVNRT)
- Heart block or atrioventricular block
- Multifocal atrial tachycardia
- Paroxysmal supraventricular tachycardia
- Sick sinus syndrome
- Ventricular fibrillation or ventricular tachycardia
- Wolff-Parkinson-White syndrome
When you have an arrhythmia, your heartbeat may be:
- Too slow (bradycardia)
- Too quick (tachycardia)
- Irregular, uneven, possibly with extra or skipped beats
An arrhythmia may be present all of the time or it may come and go. You may or may not feel symptoms when the arrhythmia is present. Or, you may only notice symptoms when you are more active.
Symptoms can be very mild, or they may be severe or even life threatening.
Common symptoms that may occur when the arrhythmia is present could include:
- Chest pain
- Fainting
- Lightheadedness, dizziness
- Paleness
- Palpitations (feeling your heart beat fast or irregularly)
- Shortness of breath
- Sweating
When an arrhythmia is serious, you may need urgent treatment to restore a normal rhythm. This may include:
- Electrical therapy (defibrillation or cardioversion)
- Implanting a short-term heart pacemaker
- Medicines given through a vein or by mouth
Sometimes, better treatment for your angina or heart failure will lower your chance of having an arrhythmia.
Medicines called anti-arrhythmic drugs may be used:
- To prevent an arrhythmia from happening again
- To keep your heart rate from becoming too fast or too slow
Some of these medicines can have side effects. Take them as prescribed by your provider. Do not stop taking the medicine or change the dose without first talking to your provider.
Other treatments to prevent or treat abnormal heart rhythms include:
- Cardiac ablation, used to target areas in your heart that may be causing your heart rhythm problems
- An implantable cardioverter defibrillator, placed in people who are at high risk of sudden cardiac death
- Permanent pacemaker, a device that senses when your heart is beating too slowly. It sends a signal to your heart that makes your heart beat at the correct pace.
Cardiology Clinical Group
Kevin Mcgrody is a Cardiologist and a Cardiac Electrophysiologist in Penfield, New York. Dr. Mcgrody has been practicing medicine for over 26 years and is rated as a Distinguished provider by MediFind in the treatment of Arrhythmias. His top areas of expertise are Familial Progressive Cardiac Conduction Defect, Familial Ventricular Tachycardia, Arrhythmias, Atrial Fibrillation, and Pacemaker Implantation.
Rochester General Hospital
Sarah Taylor is a Cardiologist and a Cardiac Electrophysiologist in Rochester, New York. Dr. Taylor and is rated as a Distinguished provider by MediFind in the treatment of Arrhythmias. Her top areas of expertise are Arrhythmias, Sick Sinus Syndrome, Familial Neurocardiogenic Syncope, Pacemaker Implantation, and Cardiac Ablation.
Western New York Medical Practice PC
George Pancio is a Cardiologist in Clifton Springs, New York. Dr. Pancio and is rated as an Advanced provider by MediFind in the treatment of Arrhythmias. His top areas of expertise are Atrial Fibrillation, Coronary Heart Disease, Atherosclerosis, and Angina.
The outcome depends on several factors:
- The kind of arrhythmia you have.
- Whether you have coronary artery disease, heart failure, or valvular heart disease.
Contact your provider if:
- You develop any of the symptoms of a possible arrhythmia.
- You have been diagnosed with an arrhythmia and your symptoms worsen or do not improve with treatment.
Taking steps to prevent coronary artery disease may reduce your chance of developing an arrhythmia.
Summary: Patients who have survived a myocardial infarction (MI) are at increased risk for sudden cardiac death (SCD) caused by ventricular tachycardia and ventricular fibrillation. A severely reduced left ventricular ejection fraction (LVEF) as a rough overall measure of impaired heart function after MI was shown to indicate a higher risk for SCD. Based on this observation, two landmark randomised trials,...
Summary: This study is researching an experimental drug called REGN7544 (called study drug). The study is focused on participants with POTS. The aim of the study is to see how safe, tolerable, and effective the study drug is. The study is looking at several other research questions, including: * How the study drug changes heart rate and blood pressure in participants with POTS * What side effects may happe...
Published Date: May 27, 2024
Published By: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Al-Khatib SM, Stevenson WG, Ackerman MJ, et al. 2017 AHA/ACC/HRS guideline for management of patients with ventricular arrhythmias and the prevention of sudden cardiac death: Executive summary: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society. Heart Rhythm. 2018;15(10):e190-e252. PMID: 29097320 pubmed.ncbi.nlm.nih.gov/29097320/.
Nattel S, Tomaselli GF. Mechanisms of cardiac arrhythmias. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 62.
Olgin JE. Approach to the patient with suspected arrhythmia. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 49.
Tracy CM, Epstein AE, Darbar D, et al. 2012 ACCF/AHA/HRS focused update of the 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. J Am Coll Cardiol. 2012;60(14):1297-1313. PMID: 22975230 pubmed.ncbi.nlm.nih.gov/22975230/.