Atrial flutter (AFL) is a type of abnormal heart rate, or arrhythmia. It occurs when the upper chambers of your heart (the atria) beat too fast. When the top of your heart (atria) beats faster than the bottom (ventricles), it complicates your heart rhythm.
Your heart is controlled by a natural pacemaker (called the sinus node) that is found in the right atrium. It sends out signals to both the right and left atria. Those signals tell the top of the heart (atria) how and when to contract. When you have AFL, the atria send signals that overwhelm the sinus node. This makes them contract rapidly. The lower chambers respond by also beating very rapidly. A normal heart bate is 60-100 beats per minute (bpm). People with AFL have hearts that beat at 250-300) bpm.
Approximately 50% of the patients with AF with CHADS-VASc ≥1 used warfarin. The average TTR was 65.2% but increased to 74.5% among patients using warfarin continuously (ie, without gaps exceeding 56?days between successive INR tests) during follow-up. One-third of the patients had a TTR of below 60%.