What is the significance of counting the number of QRS complexes in an ECG?

What is the significance of counting the number of QRS complexes in an ECG?
  1. It indicates the heart rate of an individual
  2. It indicates the shape of the ECG
  3. It indicates the possible abnormality or disease
  4. It indicates the cardiac cycle

Solution

By counting the number of QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual.

Asked in: NCERT

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