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Question:

Match the Column-I with Column-II.
Column-I
Column-II
A. P-wave
(i) Depolarisation of ventricles
B. QRS complex
(ii) Repolarisation of ventricles
C. T-wave
(iii) Coronary ischemia
D. Reduction in the size of T-wave
(iv) Depolarisation of atria
(v) Repolarisation of atria
Select the correct option.

A-(iv), B-(i), C-(ii), D-(v)

A-(ii), B-(i), C-(v), D-(iii)

A-(iv), B-(i), C-(ii), D-(iii)

A-(ii), B-(iii), C-(v), D-(iv)

Solution:

Correct option is A. A-(iv), B-(i), C-(ii), D-(iii)
In ECG P-wave represents depolarisation of atria. QRS complex represents depolarisation of ventricles. T-wave represents repolarisation of ventricle i.e., return from excited to normal state. Reduction in the size of T-wave i.e., if the T-wave represents insufficient supply of oxygen i.e., coronary ischemia.
So, the correct answer is '(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)'