What should be monitored to confirm farfield signals from the SVC during AF ablation?

To confirm farfield signals from the Superior Vena Cava (SVC) during atrial fibrillation (AF) ablation, pacing from the SVC is critical. During an ablation procedure, understanding the electrical signals from the SVC can help in mapping and identifying the correct targets for achieving isolation and eliminating AF triggers.

When pacing from the SVC, the resulting farfield signals can provide important information about the electrical activity in that area, helping to distinguish between signals originating from the SVC and those from the surrounding anatomy. This is essential because the SVC is often a site of arrhythmogenic activity, and accurately identifying its signals can aid in effective ablation strategies.

Other methods, such as pacing from the Left Superior Pulmonary Vein (LSPV), would not provide the same direct insights into SVC signals, while direct heart rate measurements do not specifically address the farfield signal characteristics of the SVC. Similarly, echocardiogram results do not provide real-time electrical signal characteristics necessary for confirming farfield signals during an ablation procedure. Therefore, pacing from the SVC is the most direct and informative method for this purpose.