[Answer] What does an ECG check?

Step 1 : Introduction to the question "What does an ECG check?"

...1. The brain 2. The heart 3. The lungs 4. Blood pressure

Step 2 : Answer to the question "What does an ECG check?"

The heart - An electrocardiogram, also known as an ECG or EKG, checks and records the electrical signals in your heart. These electrical signals register as types of waves — a P wave, a QRS complex, and a T wave — each of which measures a different aspect of the heart's rhythm. Doctors can use an ECG to detect potential issues, such as whether the electrical activity of a patient's heartbeat is fast or irregular, or whether there are structural problems within the chambers of the heart. Although it may sound scary, it's a painless and noninvasive test. Sticky electrodes that act as sensors are placed on specific areas of an individual's chest or limbs. These electrodes then record the electrical signals and display them as waves on a monitor or printout. In most cases, the test takes just a few minutes.:

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