What is the primary function of an electrocardiogram (ECG)?

The primary function of an electrocardiogram (ECG) is to provide a visual representation of cardiac activity. The ECG records the electrical impulses that trigger heartbeats, creating a graphical display of the heart's rhythm over time. This visual representation allows healthcare providers to assess the heart's activity, identify abnormalities in heart rhythm, detect issues such as heart enlargement or ischemia, and monitor the overall cardiac health of a patient.

This capability is crucial for diagnosing various cardiac conditions and guiding treatment decisions. While other functions such as controlling the heart's rhythm or measuring blood pressure are essential aspects of cardiovascular care, they are not directly related to the ECG's role. Similarly, detecting respiratory rates is not within the ECG's scope, as it specifically focuses on the electrical activity of the heart.