PMID- 36589707 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230103 IS - 2090-8016 (Print) IS - 2090-0597 (Electronic) IS - 2090-0597 (Linking) VI - 2022 DP - 2022 TI - The Primary Alteration of Ventricular Myocardium Conduction: The Significant Determinant of Left Bundle Branch Block Pattern. PG - 3438603 LID - 10.1155/2022/3438603 [doi] LID - 3438603 AB - Intraventricular conduction disturbances (IVCD) are currently generally accepted as ECG diagnostic categories. They are characterized by defined QRS complex patterns that reflect the abnormalities in the intraventricular sequence of activation that can be caused by pathology in the His-Purkinje conduction system (HP) or ventricular myocardium. However, the current understanding of the IVCD's underlying mechanism is mostly attributed to HP structural or functional alterations. The involvement of the working ventricular myocardium is only marginally mentioned or not considered. This opinion paper is focused on the alterations of the ventricular working myocardium leading to the most frequent IVCD pattern-the left bundle branch block pattern (LBBB). Recognizing the underlying mechanisms of the LBBB patterns and the involvement of the ventricular working myocardium is of utmost clinical importance, considering a patient's prognosis and indication for cardiac resynchronization therapy. CI - Copyright (c) 2022 Ljuba Bacharova and Bayes de Luna. FAU - Bacharova, Ljuba AU - Bacharova L AUID- ORCID: 0000-0003-1742-8962 AD - International Laser Center CVTI, Bratislava, Slovakia. FAU - de Luna, Bayes AU - de Luna B AUID- ORCID: 0000-0003-1676-207X AD - Cardiovascular Research Foundation, Cardiovascular ICCC-Program, Research Institute Hospital de la Santa Creu i Sant Pau, Barcelona, Spain. LA - eng PT - Journal Article PT - Review DEP - 20221220 PL - United States TA - Cardiol Res Pract JT - Cardiology research and practice JID - 101516542 PMC - PMC9800102 COIS- The authors declare that there are no conflicts of interest. EDAT- 2023/01/03 06:00 MHDA- 2023/01/03 06:01 PMCR- 2022/12/20 CRDT- 2023/01/02 04:05 PHST- 2022/11/12 00:00 [received] PHST- 2022/12/06 00:00 [revised] PHST- 2022/12/08 00:00 [accepted] PHST- 2023/01/02 04:05 [entrez] PHST- 2023/01/03 06:00 [pubmed] PHST- 2023/01/03 06:01 [medline] PHST- 2022/12/20 00:00 [pmc-release] AID - 10.1155/2022/3438603 [doi] PST - epublish SO - Cardiol Res Pract. 2022 Dec 20;2022:3438603. doi: 10.1155/2022/3438603. eCollection 2022.