Question

Refer to the given electrocardiogram and select the correct statement.

• A. It shows electrocardiogram of a healthy person.
• B. It shows partial blockage due to damaged AV nodes.
• C. It shows complete blockage and there is no synchrony between atrial and ventricular activities
• D. It shows that muscles of the heart are weak.

Answer 1

The correct option is C It shows complete blockage and there is no synchrony between atrial and ventricular activities

Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. The P- wave represents the electrical excitation or depolarization of the atria. The QRS complex represents the depolarization of the ventricles which initiates the ventricular contraction.
The contraction starts shortly after Q and marks the beginning of the systole.
The T- wave represents the return of the ventricles from excited to a normal state or repolarization. The end of the T-wave marks the end of systole.
So, the correct option is 'It shows complete blockage and there is no synchrony between atrial and ventricular activities'.