Atrial Fibrillation

AF Pic

What is Atrial Fibrillation?

Atrial fibrillation, or AF, is the name for a type of irregular heartbeat. Your heart is located in your chest and it is a muscle about the size of a clenched fist. Its function is to pump blood around the body. The heart has its own electrical system and this is normally under the control of a pacemaker. The heart’s natural pacemaker, or sinus node, creates electrical signals to make the heart beat regularly. Normally the sinus node controls the rate of your heart beat and it can change your heart rate depending on what your body needs at a given time. Heart Rate is the number of times your heart beats per minute. For most people this is between 60 and 100 times a minute. Heart Rhythm is how regular your heart beats. Normal heart rhythm is called sinus rhythm.


If you have been diagnosed with a condition called Atrial Fibrillation (AF) the normal signal from the sinus node is not being allowed to work properly and therefore your heart will not beat in a regular fashion.


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Croí is a registered Irish heart & stroke charity dedicated to the fight against heart disease and stroke, with a special focus on the West of Ireland. 

Our Mission is to 'Prevent Disease, Save Lives, Promote Recovery and Wellbeing'

The charity is totally funded through the proceeds of fundraising events, voluntary contributions and philanthropy.
Charity Number: CHY7500

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