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Outcomes of His-bundle pacing upgrade after long-term right ventricular pacing and/or pacing-induced cardiomyopathy: Insights into disease progression.

Abstract：

BACKGROUND:His-bundle pacing (HBP) is a physiological alternative to right ventricular pacing (RVP). The outcomes of HBP in patients with longstanding atrioventricular block (AVB) and RVP are unknown OBJECTIVE: The purpose of this study was to retrospectively assess the feasibility of HBP in patients with chronic RVP and longstanding AVB and to evaluate its efficacy in reversing the adverse remodeling induced by RVP. METHODS:HBP was attempted in patients with longstanding AVB and chronic RVP and/or pacing-induced cardiomyopathy (PICM) in need for resynchronization therapy. The site of conduction block and feasibility of HBP was documented. Electrocardiographic and echocardiographic assessments at baseline and follow-up were recorded. RESULTS:HBP was successful in 79 of 85 patients (93%) with RVP for 77.6 ± 74.8 months (range 2-540 months). AV nodal block was present in 59 and infranodal block in 26. QRS duration increased from 123 ± 31 ms at baseline to 177 ± 17 ms (P <.001) during RVP and decreased to 115 ± 20 ms with HBP (P <.001). T-wave memory was observed in 53 of 79 patients with HBP and normalized in 2-12 weeks. HBP threshold was 1.47 ± 0.9 V @ 1 ms at implant and 1.9 ± 1.3 V @ 1 ms at last follow-up (25 ± 24 months). In 60 patients with PICM in whom left ventricular ejection fraction decreased from 54% ± 7.7% at baseline to 34.3% ± 9.6% (P <.001), ejection fraction improved to 48.2% ± 9.8% (P <.001) after HBP CONCLUSION: Despite a long duration of AVB and chronic RVP, HBP normalized QRS complexes and T waves with stable thresholds, suggesting that progression of distal conduction disease is uncommon in this population. Electrical and structural changes induced by chronic RVP were consistently reversed with HBP.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Vijayaraman P,Herweg B,Dandamudi G,Mittal S,Bhatt AG,Marcantoni L,Naperkowski A,Sharma PS,Zanon F

doi

10.1016/j.hrthm.2019.03.026

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

1554-1561

issue

10

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(19)30295-4

journal_volume

16

pub_type

杂志文章,多中心研究

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