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| The first tracing shows a recording of a fast pathway potential in a patient with A.V. nodal tachycardia. |
| The following three pannels show the ablation of the fast pathway. The tracings are continuous. The radio frequency energy is applied (line marked TIR). Not the appearance of a nodal tachycardia. |
| The second tracing shows the remainder of the ablation. Note the PR interval has lengthened. |
| The third tracing shows the effect of the ablation of the fast pathway: the prolongation of the PR interval. |
