An electrocardiogram (ECG) is a picture of the heart’s electrical activity, and an ECG interpretation can identify many heart conditions. To interpret an ECG, you can:
- Read systematically: Look at the heart rate, rhythm, axis, and intervals.
- Consider the waves: The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, the R wave is the tallest wave in the QRS complex, and the S wave represents the final depolarization of the ventricles.
- Check for abnormalities: Look for an irregular, fast, or slow heart rhythm, a heart attack, or other issues.
- Consider the paper speed: ECG paper usually moves at 25 mm/second, so each small box is 0.04 seconds and each large box is 0.2 seconds.
- Consider the patient’s age: Many values change with age.
A normal ECG shows a heart rate of 60 to 100 beats per minute. Some conditions that can show up on an ECG include:
- Heart attack
- Heart failure
- Heart defect
- Coronary artery disease
- Heart valve disease
- Enlarged heart
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