Atrial flutter is an abnormal heart rhythm that occurs when an electrical signal circulates around your heart in an abnormal pattern. This causes the upper chambers of your heart (the atria) to beat too quickly and in an irregular pattern. This is different from a normal sinus rhythm, which is a regular and normal heart rhythm that originates from the sinoatrial (SA) node in the right atrium.
Atrial flutter occurs when an abnormal electrical circuit forms in the atria, causing the heart to beat too quickly. This can be caused by medical conditions such as high blood pressure, heart attack, or a heart valve disorder. The flutter is usually more rapid than a normal sinus rhythm, and can range from 150-250 beats per minute.
Atrial flutter can also be caused by certain medications, alcohol, or stimulants. If left untreated, atrial flutter can lead to serious complications, such as stroke, heart failure, or even death. Treatment of atrial flutter usually involves controlling the abnormal heart rhythm with medications or by using electrical cardioversion, which is a procedure that uses electrical shocks to restore the heart to a normal rhythm.
In conclusion, atrial flutter is not a sinus rhythm, as it is an abnormal heart rhythm that is caused by an abnormal electrical circuit in the atria. It is usually more rapid than a normal sinus rhythm and can lead to serious complications if left untreated. Treatment of atrial flutter involves controlling the abnormal heart rhythm with medications or electrical cardioversion.