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The primary purpose of an ECG, or electrocardiogram, is to record the electrical activity of the heart. This non-invasive test measures the timing and strength of electrical signals as they travel through the heart. By analyzing these signals, healthcare professionals can identify various conditions related to heart rhythm and structure, such as arrhythmias, heart attacks, and other cardiac issues.

An ECG is crucial for diagnosing and monitoring heart health, as it provides essential information about the heart's function without the need for invasive procedures. It helps in assessing the heart's overall electrical activity, detecting abnormalities, and guiding treatment plans.

In contrast, measuring blood pressure and determining blood cholesterol levels are physiological assessments that do not provide specific insight into the heart's electrical activity. Visualizing blood flow through vessels requires different imaging modalities, such as ultrasound or angiography, which focus on the circulatory system rather than the electrical signals produced by the heart.