Arrhythmia refers to irregular heartbeat that can be too fast, too slow, or have extra or missed beats. It occurs due to the heart's natural pacemaker (sinus node) not controlling heartbeat or other parts of the heart taking over as pacemaker. Arrhythmia is classified as normotopic if the sinus node is still pacemaker or ectopic if another area is pacemaker. Common types of normotopic arrhythmia include sinus arrhythmia which varies heartbeat with breathing, and sinus tachycardia or bradycardia which are fast or slow heart rates. Ectopic arrhythmia occurs when other areas generate impulses, like atrial flutter which causes rapid ineffective atrial contractions