case_images: PMC11021669_01
case_images: A third-degree atrioventricular block before the CNA procedure.
case_images: fcvm-11-1370522-g001.jpg
case_images: PMC11021669_01_fcvm-11-1370522-g001.jpg
case_images: F1
case_images: A 19-year-old woman was admitted to our hospital with a third-degree atrioventricular block (AVB) (Figure 1), symptomatic for lipothymia and dyspnea caused by mild exertion.
case_images: An electro-anatomic mapping of the left and right atria using the CARTO system. (A) An anterior-posterior view. (B) A left-lateral view. The blue dots are regions where radiofrequency delivery caused a slowing of the narrow QRS escape rhythm. The red and pink dots are the points of ablation with an ablation index of 550 or <550, respectively. The yellow dots indicate the location of the bundle of His. IVC, inferior vena cava; LA, left atrium; LPV, left pulmonary veins; MV, mitral valve; RA, right atrium; RPV, right pulmonary veins; SVC, superior vena cava; TV, tricuspid valve.
case_images: fcvm-11-1370522-g002.jpg
case_images: PMC11021669_01_fcvm-11-1370522-g002.jpg
case_images: F2
case_images: W for 60 s, obtaining an ablation index (a parameter that takes into consideration the power, time, and stability of the lesion) between 500 and 550 (Figure 2). We administered heparin to the patient in order to maintain an activated clotting time >300 s.
case_images: A 1-month follow-up ECG with a first-degree atrioventricular block (PQ interval 260 ms).
case_images: fcvm-11-1370522-g003.jpg
case_images: PMC11021669_01_fcvm-11-1370522-g003.jpg
case_images: F3
case_images: At 1-month post-procedure, there was a complete regression of symptoms and further reduction of the PQ interval (260 ms) on baseline ECG (Figure 3).