Question

Which of the component of an ECG is correctly matched below ?

• A. Peak P - initiation of left atrial contraction only.
• B. Peak T - initiation of total cardiac contraction
• C. Peak P and R together - systolic and diastolic blood pressures
• D. QRS - one complete pulse

Answer 1

The correct option is D

QRS - one complete pulse

By counting the number of QRS complexes that occur in a given period, one can determine the heart rate (pulse) of an individual. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction.