Key result
New-onset LBBB after TAVI was associated with an increased risk of 5-year all-cause mortality compared to no conduction abnormalities (HR 1.41; 95% CI 1.04-1.92; P=0.026).
Why the study?
Previous studies provided conflicting data on the impact of new conduction abnormalities, including new LBBB and PPM implantation, on patient outcomes after TAVI.
Does new-onset conduction abnormality (LBBB or PPM) increase mortality in patients undergoing TAVI?
Cohort (n=2,370)
Does new-onset conduction abnormality (LBBB or PPM) increase mortality in patients undergoing TAVI?
Hazard Ratio: 1.41 (95% CI 1.04–1.92)
p-value: p=0.026
New-onset LBBB following TAVI is associated with a significantly increased risk of 5-year all-cause mortality, whereas new PPM implantation shows a non-significant trend.
New-onset LBBB after TAVI signals higher long-term mortality risk; leaves open whether targeted conduction interventions improve outcomes.
Previous studies provided conflicting data on the impact of new conduction abnormalities (CA), including new left bundle branch block (LBBB) and permanent pacemaker (PPM) implantation, on patient outcomes after transcatheter aortic valve implantation (TAVI). To investigate the effect of new-onset CA after TAVI on long-term clinical outcomes and the impact of new CA depending on patient baseline profile. Using data from a prospective TAVI registry (NCT01368250), patients without pre-existing LBBB or PPM were included in this study, and were stratified into three groups: no CA, new LBBB and new PPM after TAVI. Among 2370 eligible patients, 1533 (64.7%) had no CA, 336 (14.2%) had new LBBB and 501 (21.1%) had new PPM after TAVI. At 5 years, patients with new LBBB had an increased risk of all-cause death (adjusted hazard ratio [HRadjusted] 1.41, 95% confidence interval [CI] 1.04–1.92; P = 0.026), whereas patients with new PPM had a numerically increased risk of mortality (HRadjusted 1.26, 95% CI 0.99–1.60; P = 0.065) compared to patients without CA. There was no significant difference in cardiovascular mortality between groups (HRadjusted for new LBBB 1.33, 95% CI 0.91–1.97; P = 0.15; HRadjusted for new PPM 1.25, 95% CI 0.93–1.68; P = 0.13]). The adverse effects of new CA were consistent across all subgroups except for the impact of new PPM stratified by balloon-expandable versus self-expanding or mechanically expanding valves (Pinteraction = 0.004). New-onset LBBB after TAVI was associated with an increased risk of 5-year all-cause mortality, while new PPM implantation conferred a non-significant trend. Des études antérieures ont fourni des données contradictoires sur l’impact de nouvelles anomalies de conduction de conduction (CA), y compris les nouveaux blocs de branche gauche (LBBB) et l’implantation d’un stimulateur cardiaque permanent (PPM) sur les résultats des patients après l’implantation d’une valve aortique transcathéter (TAVI). Étudier l’effet de l’apparition d’un nouveau CA après un TAVI sur les résultats cliniques à long terme et l’impact du nouveau CA en fonction des patients. En utilisant les données d’un registre prospectif de TAVI (NCT01368250), les patients sans BBG ou PPM préexistant ont été inclus dans cette étude et ont été stratifiés en trois groups: pas de CA, nouveau LBBB et nouveau PPM après TAVI. Parmi les 2370 patients éligibles, 1533 (64,7 %) n’avaient pas de CA, 336 (14,2 %) avaient un nouveau LBBB et 501 (21,1 %) avaient un nouveau PPM après le TAVI. Après 5 ans, les patients présentant un nouveau LBBB avaient un risque accru de décès toutes causes confondues (rapport de risque ajusté [HRadjusted] 1,41, intervalle de confiance à 95 % [IC] 1,04–1,92; P = 0,026), tandis que les patients présentant un nouveau PPM avaient un risque numériquement accru de mortalité (HR ajusté 1,26, IC 95 % 0,99–1,60; P = 0,065) par rapport aux patients sans CA. Il n’y avait pas de différence significative en matière de mortalité cardiovasculaire entre les groupes (HR ajusté pour un nouveau LBBB 1,33, IC à 95 % 0,91–1,97; P = 0,15; HR ajusté pour le nouveau PPM 1,25, IC à 95 % 0,93–1,68; P = 0,13]). Les effets indésirables du nouvel CA étaient cohérents dans tous les sous-groupes, à l’exception de l’impact de la nouvelle PPM stratifiée selon qu’il s’agit d’une prothèse expansible par ballonnet ou d’une prothèse auto-expansible ou mécanique (Pinteraction = 0,004). L’apparition d’un LBBB après un TAVI est associée à un risque accru de mortalité à 5 ans, toutes causes confondues, tandis que l’implantation d’une nouvelle PPM a conféré une tendance non significative.
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Tomii et al. (2022) conducted a cohort in Transcatheter aortic valve implantation (TAVI) (n=2,370). New-onset left bundle branch block (LBBB) vs. No conduction abnormalities was evaluated on All-cause death at 5 years (HR 1.41, 95% CI 1.04-1.92, p=0.026). New-onset LBBB after TAVI was associated with an increased risk of 5-year all-cause mortality compared to no conduction abnormalities (HR 1.41; 95% CI 1.04-1.92; P=0.026).
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