A normal rhythm, known as , starts in the sinoatrial (SA) node—the heart's natural pacemaker. This signal travels through the heart in a specific sequence, which is visualized on an electrocardiogram (ECG) as the PQRST wave pattern:
: Ventricular contraction (bottom chambers pumping blood to the lungs and body). T Wave : Ventricular recovery (preparing for the next beat). Common Variations and Abnormalities (Arrhythmias) cardiac rhythm
Cardiac rhythm is the regular pattern of your heartbeat, controlled by the heart’s internal electrical system. In a healthy adult at rest, this rhythm typically falls between 60 and 100 beats per minute (bpm). Normal Cardiac Rhythm A normal rhythm, known as , starts in
: A common, harmless variation where the heart rate slightly increases during inhalation and decreases during exhalation. A normal rhythm