Premature atrial contractions (PACs) are one of the most common types of cardiac arrhythmias encountered in clinical practice. They occur when an electrical impulse originates prematurely in the atria—the upper chambers of the heart—rather than following the heart's normal electrical conduction pathway. PACs are often harmless, particularly when they occur occasionally in otherwise healthy individuals. However, frequent PACs may sometimes be associated with underlying cardiovascular conditions or an increased likelihood of developing other atrial arrhythmias. For this reason, recognising PACs accurately and understanding their clinical significance is important for doctors, ECG technicians, and other healthcare professionals. An electrocardiogram (ECG) remains...