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. 2022 Mar 16;64(1):217–222. doi: 10.1007/s10840-022-01182-4

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Fig. 3 — Representative case requiring additional ablation because of a sub-Eustachian pouch. A Right anterior oblique (RAO) projection of CARTO UNIVU in a patient where the first-pass conduction block was not achieved. Additional radiofrequency application with an ablation catheter arched over the Eustachian ridge achieved a bidirectional conduction block. B Intracardiac echocardiography revealed a sub-Eustachian pouch where additional radiofrequency was applied (yellow arrow). IVC, inferior vena cava; RA, right atrium; RV, right ventricle