What happens when you’re in Afib
What happens when you’re in Afib
How your heart normally works
Your heart pumps blood to the rest of your body. During each heartbeat, your two atria contract, followed by your two lower chambers (ventricles). These actions, when timed perfectly, allow your heart to work as an efficient pump. Your heart’s electrical system controls the timing of your heart’s contractions. And your sinoatrial (SA) node is normally in charge of that electrical system. This node is located in your right atrium. When your SA node fires an impulse, electrical activity spreads through your right and left atria (“atrium” is singular and “atria” is plural). Both atria then contract and force blood into your ventricles.
The impulse then travels to the atrioventricular (AV) node, located near the middle of your heart. From there, the impulse moves to your ventricles, causing them to contract and pump blood out of your heart to your lungs and the rest of your body. This process repeats with every heartbeat. The SA node directs the timing of the electrical impulses and keeps your heart pumping smoothly.
You can think of your SA node as the conductor of an orchestra. Your SA node is responsible for keeping your heart beating at the proper pace and rhythm. Likewise, an orchestra conductor directs all the musicians to keep the music flowing at the right tempo, sometimes faster and sometimes slower.
Normally, your SA node adjusts to your level of activity. For example, it increases the rate of impulses when you exercise and decreases the rate when you sleep. With the SA node conducting your heart’s rhythm, you are in “normal sinus rhythm.” This means your heart is beating at a regular rhythm and pace, about 60 to 100 times per minute.
What happens when you’re in Afib
If you have atrial fibrillation, your SA node isn’t directing your heart’s electrical rhythm. Instead, many different impulses rapidly fire at the same time, causing a fast, chaotic rhythm in your atria. As a result, your atria can’t contract or pump blood effectively into your ventricles. Your ventricles contract irregularly, causing a rapid irregular heartbeat.
It’s as if in the middle of a concert, two more conductors walked onto the stage and started waving their batons. The musicians would no longer know who to follow or what to do. The music would lose its rhythm and harmony.
Fortunately, there are many ways to bring back your heart’s rhythm and harmony if you have Afib. It all starts with a visit to your healthcare provider, who can run some tests and make a diagnosis.