An ECG gives two major kinds of information. First, it measures the time taken by an electrical wave to pass through the heart. This helps assess whether the electrical activity is normal, slow, fast, or irregular. Second, a cardiologist may be able to find out if parts of the heart are too large or are overworked by measuring the amount of electrical activity passing through the heart muscle. This plays a vital role in accurately diagnosing and managing cardiological diseases.

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