| Column $-I$ | Column $-II$ |
| $(a) \; P-$wave | $(i) \; \text{Depolarisation of ventricles}$ |
| $(b) \; QRS$ complex | $(ii) \; \text{Repolarisation of ventricles}$ |
| $(c) \; T-$wave | $(iii) \; \text{Coronary ischemia}$ |
| $(d) \; \text{Reduction in the size of } T-$wave | $(iv) \; \text{Depolarisation of atria}$ |
| $(v) \; \text{Repolarisation of atria}$ |
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