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QT interval estimation in patients with right bundle branch block using validated formulas for left bundle branch block

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dc.contributor.authorGómez, S.
dc.contributor.authorGarcía Izquierdo Jaen, E.
dc.contributor.authorMingo Santos, S.
dc.contributor.authorMartínez Mingo, Alejandro
dc.contributor.authorToquero Ramos, J.
dc.contributor.authorCastro Urda, V.
dc.contributor.authorJiménez Sánchez, D.
dc.contributor.authorAguilera Agudo, C.
dc.contributor.authorMorillo Díaz, J.D.
dc.contributor.authorVeloza Urrea, D.
dc.contributor.authorSegura Domínguez, M.
dc.contributor.authorPortoles Hernández, A.
dc.contributor.authorGarcía-Rodriguez, D.
dc.contributor.authorRemior, P.
dc.contributor.authorFernández Lozano, I.
dc.date.accessioned2025-10-27T16:36:48Z
dc.date.available2025-10-27T16:36:48Z
dc.date.issued2021-05-24
dc.descriptionThe registered version of this article, first published in EP Europace, is available online at the publisher's website: Oxford University Press, https://doi.org/10.1093/europace/euab116.012
dc.descriptionLa versión registrada de este artículo, publicado por primera vez en EP Europace, está disponible en línea en el sitio web del editor: Oxford University Press, https://doi.org/10.1093/europace/euab116.012
dc.description.abstractBACKGROUND Adequate measurement of the QT interval is of paramount importance in order to identify patients at higher risk for ventricular arrhythmias. Previous studies have described different methods to estimate baseline QT in patients with left bundle branch block (LBBB). However, the evidence regarding the assessment of QT interval in the setting of right bundle branch block (RBBB) is scarce. PURPOSE We aimed to analyze the feasibility and accuracy of the different formulas described for LBBB in the estimation of the QT interval in RBBB. METHODS We enrolled patients who underwent left sided electrophysiologic procedures. All patients were in sinus rhythm and had narrow QRS. Pacing was performed from the left atrial appendage for baseline measurements, and from the left aspect of the interventricular septum (selective capture of the left bundle was attempted) to measure RBBB QT and QRS. Pacing cycle length was 800 ms or slightly below patients´ intrinsic rhythm at both locations. Measurements were performed manually (using digital calipers) according to current recommendations and corrected using Bazett. Validated formulas for LBBB QT considered are described in table 1. RESULTS 50 patients (42 cryoballoon pulmonary veins isolation (PVI), 4 radiofrequency PVI, 4 concealed left accessory pathways). 70% were male. Mean age was 62 ± 11 years old. Left ventricle ejection fraction was 58 ± 10%. 66% and 60% of the patients were taking betablockers and antiarrhythmic drugs, respectively. Mean pacing cycle length was 707 ± 99 ms. Baseline measurements: QRS 95 ± 10, QT 391 ± 36, QTc 467 ± 39 ms. RBBB measurements: QRS 165 ± 21, QT 448 ± 46, QTc 531 ± 52 ms. Correlations between baseline and estimated QTc were good for all the formulas (table 1). Reliability analysis showed that both Yankelson and Wang methods had the highest intraclass correlation coefficients (ICC) when trying to estimate baseline QTc. CONCLUSIONS Previously described formulas for LBBB exhibit marked differences regarding reliability in the estimation of QTc interval in the setting of RBBB. According to our results, Yankelson’s method shows the most consistent agreement when estimating baseline QTc interval in patients with RBBB.en
dc.description.provenanceMade available in DSpace on 2025-10-27T16:36:48Z (GMT). No. of bitstreams: 1 QT interval estimation in patients.pdf: 784563 bytes, checksum: b377c2f09f43e6fb88a7c34096ecae8a (MD5) Previous issue date: 2021-05-24en
dc.description.versionversión publicada
dc.identifier.citationGarcía Gómez, S., García Izquierdo Jaén, E., Mingo Santos, S., Martínez Mingo, A., Toquero Ramos, J., Castro Urda, V., Jiménez Sánchez, D., Aguilera Agudo, C., Morillo Díaz, J. D., Veloza Urrea, D., Segura Domínguez, M., Portolés Hernández, A., García-Rodríguez, D., Remior, P., & Fernández Lozano, I. (2021). QT interval estimation in patients with right bundle branch block using validated formulas for left bundle branch block. EP Europace, 23(Suppl 3), euab116.012. https://doi.org/10.1093/europace/euab116.012
dc.identifier.doihttps://doi.org/10.1093/europace/euab116.012
dc.identifier.issn1532-2092
dc.identifier.urihttps://hdl.handle.net/20.500.14468/30645
dc.journal.issueSupplement_3
dc.journal.titleEP Europace
dc.journal.volume23
dc.language.isoen
dc.publisherOxford University Press
dc.relation.centerFacultad de Psicología
dc.relation.departmentMetodología de las Ciencias del Comportamiento
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/deed.es
dc.subject3205.01 Cardiología
dc.subject6106 Psicología experimental
dc.titleQT interval estimation in patients with right bundle branch block using validated formulas for left bundle branch blocken
dc.typeartículoes
dc.typejournal articleen
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscoveryb983cf3d-276e-461e-a115-b07f4de7a599
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