ECG
An electrocardiogram (ECG) is a medical test that detects heart problems by measuring the electrical activity generated by the heart as it contracts. ECGs from healthy hearts have a characteristic shape. If the ECG shows a different shape it could suggest a heart problem.
AT NORMAL RANGE
Normal intervals There is a recognised normal range for such 'intervals': PR interval (measured from the beginning of the P wave to the first deflection of the QRS complex). Normal range 120 – 200 ms (3 – 5 small squares on ECG paper). ... Normal range up to 120 ms (3 small squares on ECG paper).
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