Question

The given figure is the ECG of a normal human. Which one of its components is correctly interpreted below?

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

Answer 1

The correct option is A Complex QRS - one complete pulse

A. Complex QRS - one complete pulse

Reason: P wave is a small upward wave that represents electrical excitation or the atrial depolarisation which leads to contraction of both the atria (atrial contraction). QRS Complex is formed when the ventricles (the two lower chambers of the heart) are contracting to pump out blood. It is one complete pulse. ST segment measures the end of the contraction of the ventricles to the beginning of the rest period before the ventricles begin to contract for the next beat.