Bundle branch block after ablation for Wolff–Parkinson–White syndrome

• Published in: International journal of cardiology 2013-09, Vol.168 (1), p.495-499
• Main Authors: FUENMAYOR A, Abdel J, RODRIGUEZ S, Yenny A
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Aged; Biological and medical sciences; Bundle branch block; Bundle-Branch Block - diagnosis; Bundle-Branch Block - physiopathology; Cardiac dysrhythmias; Cardiology. Vascular system; Cardiovascular; Catheter ablation; Catheter Ablation - adverse effects; Catheter Ablation - trends; Child; Child, Preschool; Female; Follow-Up Studies; Heart; Humans; Male; Medical sciences; Middle Aged; Retrospective Studies; Wolff-Parkinson-White Syndrome - physiopathology; Wolff-Parkinson-White Syndrome - surgery; Wolff–Parkinson–White syndrome; Young Adult
• ISSN: 0167-5273; 1874-1754
• DOI: 10.1016/j.ijcard.2012.09.153

Abstract Background Bundle branch block (BBB) is a difficult diagnosis in the Wolff–Parkinson–White syndrome (WPW). We investigated the clinical implications of BBB that appears after performing an accessory pathway (AP) ablation. Methods We studied 199 patients with WPW who were submitted to AP ablation. Thirty (15%) exhibited BBB after the ablation. Twenty-two patients had right BBB and 8 had left BBB. Thirteen patients had right-sided AP and 17 had left-sided AP. They were compared with 82 similar patients without BBB after the AP ablation. Results Among the patients with BBB, 86.66% showed delays in the middle part of the QRS in the ECG recorded before ablation vs. 18.29% of the patients without BBB (p < 0.05) (sensitivity 86%, specificity 81%, positive predictive value 67% and negative predictive value 93%). Forty-four percent of the patients with BBB had BBB morphology during orthodromic tachycardia vs. 10% of the patients without BBB (p < 0.05) (sensitivity 44%, specificity 89%, positive predictive value 57% and negative predictive value 82%). No relationship was found between AP location and the site of the BBB. Ejection fraction was normal before (0.61 ± 0.03) and upon completion of follow-up (0.61 ± 0.07). BBB disappeared in 95.3% of the patients. Conclusions Delays in the middle portion of the QRS may predict BBB after AP ablation. BBB after performing AP ablation is frequent, transient, benign, and not related to either the ablation lesion location or progression to structural heart disease. BBB after AP ablation may be related to cardiac memory.