{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T13:40:31Z","timestamp":1785332431861,"version":"3.55.0"},"reference-count":36,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,5,20]],"date-time":"2025-05-20T00:00:00Z","timestamp":1747699200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Vet. Sci."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The differentiation between ventricular tachycardias (VT) and supraventricular tachycardias (SVT) with bundle branch block (BBB) is clinically challenging. The aim of the study was to define by the 12-lead-electrocardiogram the QRS complex morphology in monomorphic VT (MVT) and in BBB.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Twelve-lead-electrocardiograms were blindly retrospectively analyzed and categorized in four groups: sinus rhythm with left bundle branch block (SR-LBBB), sinus rhythm with right bundle branch block (SR-RBBB), MVT with RBBB configuration (MVT-RBBB), MVT with LBBB configuration (MVT-LBBB). Measurements were not normally distributed, and they were normalized by Box\u2013Cox transformation. Repeated-measures linear mixed-effects models were constructed according to the 3 measurements performed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 103 12-lead-electrocardiograms were retrospectively analyzed: 18 SR-RBBB, 18 SR-LBBB, 33 MVT-RBBB, 34 MVT-LBBB. Limb leads concordance was found in 100% of SR-RBBB, 100% of SR-LBBB, 54.5% of MVT-RBBB, 70.6% of MVT-LBBB. Precordial leads discordance was present in 100% of SR-RBBB, 100% of SR-LBBB, 78.8% of MVT-RBBB, 88.2% of MVT-LBBB. The transition point was located at V1-V2 in 100% of SR-RBBB, 100% of SR-LBBB, 50.5% of MVT-RBBB and 71.5% of MVT-LBBB. Positive V1 with M shape morphology was detected in 100% of SR-RBBB and 12% of MVT-RBBB. The mean electrical axis on the frontal plane was -108.15\u00b0 (\u2212118.29 \/ \u2212101.52) in RSSR-RBBB, 75.42\u00b0 (71.78\u201380.46) in RSSR -LBBB, -93.46\u00b0 (\u2212102.75\/\u221278.49) in MVT-RBBB and 82.27\u00b0 (76.85\u201388.95) in MVT-LBBB.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>In case of inability to identify signs of atrioventricular dissociation, the presence of standard limb leads discordance, precordial leads concordance or discordance with transition point other than V1-V2, left limb leads and left precordial leads discordance, aVR and V1 discordance and absence of M shape configuration of the QRS complex in lead V1 is likely to be MVT.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fvets.2025.1579951","type":"journal-article","created":{"date-parts":[[2025,5,20]],"date-time":"2025-05-20T05:56:23Z","timestamp":1747720583000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["QRS complex configurations in 12-lead electrocardiograms of dogs with monomorphic ventricular tachycardia or complete bundle branch block"],"prefix":"10.3389","volume":"12","author":[{"given":"Manuela","family":"Perego","sequence":"first","affiliation":[{"name":"Clinica Veterinaria Malpensa Anicura","place":["Samarate, Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandra","family":"Maffei","sequence":"additional","affiliation":[{"name":"Clinica Veterinaria Malpensa Anicura","place":["Samarate, Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Damiano","family":"Cavallini","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medical Sciences, University of Bologna","place":["Bologna, Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Santilli","sequence":"additional","affiliation":[{"name":"Clinica Veterinaria Malpensa Anicura","place":["Samarate, Italy"]},{"name":"Department of Clinical Sciences, College of Veterinary Medicine, Cornell University","place":["Ithaca, NY, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,5,20]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"365","DOI":"10.2478\/jvetres-2018-0052","article-title":"Use of aVR and Jastrzebski algorithms in the classification of wide complex tachycardia in dogs - a preliminary study","volume":"62","author":"Micha\u0142ek","year":"2018","journal-title":"J Vet Res"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"363","DOI":"10.1016\/j.jvc.2012.04.001","article-title":"Orthodromic atrioventricular 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