PMID- 32528587 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20240328 IS - 1880-4276 (Print) IS - 1883-2148 (Electronic) IS - 1880-4276 (Linking) VI - 36 IP - 3 DP - 2020 Jun TI - Transient narrowing of a wide QRS tachycardia. What is the mechanism? PG - 542-543 LID - 10.1002/joa3.12334 [doi] AB - Electrocardiogram showing a regular wide QRS tachycardia with left branch block (LBBB) like in morphology at 200 beats per minute (bpm). During electrophysiology study, it suddenly gets narrow and faster. What is the mechanism of the switch from a broad complex to a narrow complex tachycardia? CI - (c) 2020 The Authors. Journal of Arrhythmia published by John Wiley & Sons Australia, Ltd on behalf of Japanese Heart Rhythm Society. FAU - Ribes, Francisco AU - Ribes F AUID- ORCID: 0000-0003-3894-6179 AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. AD - Instituto de Investigacion Sanitaria INCLIVA Valencia Spain. FAU - Martinez-Brotons, Angel AU - Martinez-Brotons A AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. FAU - Ferrero-De-Loma-Osorio, Angel AU - Ferrero-De-Loma-Osorio A AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. FAU - Bondanza, Lourdes AU - Bondanza L AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. FAU - Albiach, Cristina AU - Albiach C AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. AD - Instituto de Investigacion Sanitaria INCLIVA Valencia Spain. FAU - Marcos-Garces, Victor AU - Marcos-Garces V AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. FAU - Ruiz-Granell, Ricardo AU - Ruiz-Granell R AD - Arrhythmia Unit Department of Cardiology Hospital Clinico Universitario Valencia Valencia Spain. LA - eng PT - Journal Article DEP - 20200324 PL - Japan TA - J Arrhythm JT - Journal of arrhythmia JID - 101263026 PMC - PMC7279974 OTO - NOTNLM OT - accessory pathway OT - concealed conduction OT - orthodromic atrioventricular reentrant tachycardia OT - wide QRS tachycardia COIS- All authors had access to the data and a role in writing the manuscript. EDAT- 2020/06/13 06:00 MHDA- 2020/06/13 06:01 PMCR- 2020/03/24 CRDT- 2020/06/13 06:00 PHST- 2019/11/19 00:00 [received] PHST- 2020/02/15 00:00 [revised] PHST- 2020/03/06 00:00 [accepted] PHST- 2020/06/13 06:00 [entrez] PHST- 2020/06/13 06:00 [pubmed] PHST- 2020/06/13 06:01 [medline] PHST- 2020/03/24 00:00 [pmc-release] AID - JOA312334 [pii] AID - 10.1002/joa3.12334 [doi] PST - epublish SO - J Arrhythm. 2020 Mar 24;36(3):542-543. doi: 10.1002/joa3.12334. eCollection 2020 Jun.