Normal sinus rhythm refers to the heart's natural rhythm, which is generated by the sinoatrial node, a group of cells located in the right atrium. This rhythm is characterized by a consistent heart rate, typically between 60 and 100 beats per minute, and a regular pattern of electrical impulses that coordinate the heart's contractions. In a normal sinus rhythm, each heartbeat is initiated by the sinoatrial node, leading to a smooth and efficient pumping of blood throughout the body. This rhythm is essential for maintaining proper blood circulation and overall cardiovascular health. Abnormalities in this rhythm can indicate underlying health issues.