What does an electrocardiogram monitor?

An electrocardiogram (ECG or EKG) is a medical test that measures and monitors the electrical activity of the heart. It provides a visual representation of the electrical impulses that trigger each heartbeat, allowing healthcare professionals to evaluate heart rhythm, identify abnormal electrical activity, and diagnose various heart conditions. The electrical signals recorded by the ECG can reveal information about heart rate, the size and position of the heart chambers, and the presence of any damage or abnormalities in heart function. This is critical in assessing cardiovascular health and guiding treatment decisions. The other listed options pertain to different physiological measurements that are monitored using other types of tests and devices, highlighting the specific role of an ECG in cardiac evaluation.