07/03/2026
ECG rhythm change means any variation from the normal heart rhythm seen on an electrocardiogram (ECG). A normal rhythm, called sinus rhythm, starts from the sinoatrial (SA) node and shows regular P waves, QRS complexes, and T waves. When this pattern changes, it may indicate an arrhythmia. Rhythm changes can be fast (tachycardia), slow (bradycardia), or irregular. Common examples include atrial fibrillation, supraventricular tachycardia, ventricular tachycardia, and heart blocks. These changes can occur due to electrolyte imbalance, heart disease, hypoxia, drug effects, stress, or infection. ECG helps detect rhythm problems by showing abnormal wave shapes, missing waves, or unequal time intervals between beats. Some rhythm changes are harmless, but others can reduce cardiac output and cause dizziness, chest pain, or even cardiac arrest. Early recognition of ECG rhythm changes is important for prompt treatment such as medication, electrical cardioversion, or pacing. Regular monitoring helps prevent serious complications and improves patient outcomes.
