Multifocal atrial tachycardia

Multifocal atrial tachycardia (MAT), sometimes called chaotic atrial tachycardia or chaotic atrial rhythm, is a heart rhythm disorder where the upper chambers of the heart (the atria) beat too fast and in an irregular, disorganized way. Normally, the heart's electrical signal starts from one spot and travels in an orderly pattern. In MAT, at least three different areas in the atria are sending out electrical signals at the same time, causing the heart to beat rapidly and unpredictably — usually faster than 100 beats per minute. This condition most often affects people who already have a serious underlying illness, especially lung diseases like chronic obstructive pulmonary disease (COPD), pneumonia, or heart failure. It can also be triggered by low oxygen levels, certain medications, or electrolyte imbalances (like low potassium or magnesium). In newborns and infants, MAT can occur without an obvious cause and often resolves on its own. Common symptoms include a racing or fluttering heartbeat, shortness of breath, dizziness, chest discomfort, and fatigue. Treatment focuses on managing the underlying cause — for example, treating a lung infection or correcting electrolyte levels. Medications to slow the heart rate, such as calcium channel blockers or beta-blockers, may also be used. In most adults, controlling the root cause leads to improvement in the heart rhythm.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Bring these to your next appointment

• Q1.What is causing my MAT, and how do we treat that underlying cause?,Which medications are you recommending to control my heart rate, and what are the side effects?,How will we know if the treatment is working — what should I watch for at home?,Are there any activities or medications I should avoid while I have this condition?,When should I go to the emergency room versus calling your office?,Will my heart rhythm go back to normal once the underlying cause is treated?,Do I need any follow-up heart monitoring, like a Holter monitor or repeat ECG?

Common questions about Multifocal atrial tachycardia