Under normal circumstances, each heartbeat of a healthy individual generates one pulse, with the pulse rate being equal to the heart rate. During tachycardia, the pulse rate increases. If the heart rate and pulse rate are not the same, it indicates arrhythmia. This discrepancy between pulse rate and heart rate can be caused by severe arrhythmias, such as ventricular premature beats, atrial premature beats, atrial fibrillation, and significant atrioventricular block. This condition occurs because the strength and speed of heartbeats vary, with some weak heartbeats not being strong enough to be reflected in the pulse, leading to an inconsistency between heartbeats and pulse. This condition requires an electrocardiogram.