Sinus rhythm 1100 should be wrong because human heart rate does not reach 1100 beats, it should refer to sinus heart rate 110 beats. Sinus rhythm is the normal rhythm of human heartbeat, which refers to the electrical activity of the heart that emanates from the sinus node and conducts sequentially to the atria, atrioventricular node, ventricles, and Purkinje fibers, and the corresponding electrical activity is captured on the electrocardiogram. In a normal person, sinus rhythm ranges from 60-100 beats per minute, and if the person is exercising, the heart rate increases and can reach 140-150 beats per minute. A sinus rhythm of 110 beats is a normal heartbeat if you are exercising, and an abnormal heartbeat if you are at rest, which is tachycardia. There are many causes of tachycardia, both physiological and pathological.