Question

Given here is ECG of a normal human. Which one of its components is correctly interpreted?

• A. Complex QRS - One complete pulse
• B. Peak T - Initiation of total cardiac contraction
• C. Peak P and peak R together - Systolic 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

An electrocardiogram — EKG or ECG — is a graphical representation of the electrical activity of the heart measured across a cardiac cycle. During every heart beat, an electrical impulse (or “wave”) travels through the heart.

It is marked by three entities – a P-wave, a QRS complex and a T-wave – each has a fairly unique pattern.

The P-wave represents atrial depolarisation. The QRS complex represents ventricular depolarisation (one complete pulse). The T-wave represents ventricular repolarisation.