What is the risk associated with cryo for AVNRT?

Ablation using cryoenergy for atrioventricular nodal reentrant tachycardia (AVNRT) carries a risk of complete heart block. This occurs because the procedure targets the electrical pathways near the AV node, which, while aiming to eliminate the arrhythmia, can inadvertently damage the surrounding conductive tissues. If the ablation lesions are placed too close to or directly affect the AV node, it can lead to disruption in electrical conduction, resulting in complete heart block. This complication is significant enough that monitoring and precautionary measures are typically implemented during the procedure to mitigate such risks.

The other choices present alternative statements that do not accurately reflect the complexities or realities of cryoablation for AVNRT. For instance, stating there are "no risks of recurrence" is misleading, as while ablation is often successful, recurrences can occur depending on various factors. Similarly, the assertion of a "guaranteed successful ablation" does not account for the variability in individual patient cases and the potential for ineffective results. Lastly, the claim of "no testing performed before ablation" undermines standard medical protocols where diagnostic testing is commonly utilized to assess the condition and plan the treatment effectively.