ABC | Volume 115, Nº1, Suplement, July 2020

Case Report Pérez-Riera et al. Transient left anterior fascicular block Arq Bras Cardiol 2020; 115(1Suppl.1):1-5 Sources of Funding There were no external funding sources for this study. Study Association This study is not associatedwith any thesis or dissertationwork. Ethics approval and consent to participate This article does not contain any studies with human participants or animals performed by any of the authors. 1. Nikus KC, Eskola MJ. Electrocardiogram patterns in acute left main coronary artery occlusion. J Electrocardiol. 2008;41(6):626-9. 2. Avula HR, Rassi AN. The Current State of Left Main Percutaneous Coronary Intervention. Curr Atheroscler Rep. 2018;20(1):3. 3. Vyas PM, Prajapati JS, Sahoo SS, Patel IV, Deshmukh JK, Patel C, et al. Study of ShortandIntermediateTermClinicalOutcomesofPatientswithProtectedand Unprotected LMCA Stenting. J ClinDiagn Res. 2017;11(4):OC29-OC33. 4. Elizari MV, Acunzo RS, Ferreiro M. Hemiblocks revisited. Circulation. 2007;115(9):1154-63. 5. Prieto-SolisJA,BenitoN,Martin-DuranR.[Electrocardiographicdiagnosisofleft main coronary artery obstruction using ST-segment and QRS-complex vector analysis]. Rev Esp Cardiol. 2008;61(2):137-45. 6. Perez-RieraAR,Barbosa-BarrosR,Daminello-RaimundoR,deAbreuLC,Nikus K. Transient left septal fascicular block and left anterior fascicular block as a consequenceofproximalsubocclusionofthe leftanteriordescendingcoronary artery. AnnNoninvasive Electrocardiol. 2018:e12546. 7. Perez-Riera AR, Barbosa-Barros R, Lima Aragao W, Daminello-Raimundo R, de Abreu LC, Tonussi Mendes Rossette do Valle JE, et al. Transient left septal fascicularblock inthesettingofacutecoronarysyndromeassociatedwithgiant slurring variant J-wave. AnnNoninvasive Electrocardiol. 2018;23(6):e12536. 8. Perez-RieraAR,Nadeau-RouthierC,Barbosa-BarrosR,BaranchukA.Transient Left Septal Fascicular Block: An Electrocardiographic Expression of Proximal ObstructionofLeftAnteriorDescendingArtery?AnnNoninvasiveElectrocardiol. 2016;21(2):206-9. 9. Riera AR, Ferreira C, Ferreira Filho C, Dubner S, Schapachnik E, Uchida AH, et al. Wellens syndrome associated with prominent anterior QRS forces: an expression of left septal fascicular block? J Electrocardiol. 2008;41(6):671-4. 10. Penaloza D, Tranchesi J. The threemain vectors of the ventricular activation process in the normal human heart. I. Its significance. Am Heart J. 1955;49(1):51-67. 11. Rosenbaum MB, Elizari MV, Lazzari JO. Los hemibloqueos. Buenos Aires: Editora Paidos; 1967. 12. Frink RJ, James TN. Normal blood supply to the human His bundle and proximal bundle branches. Circulation. 1973;47(1):8-18. 13. Bosch X, Theroux P, Roy D, Moise A, Waters DD. Coronary angiographic significance of left anterior fascicular block during acute myocardial infarction. J Am Coll Cardiol. 1985;5(1):9-15. 14. James TN. Anatomy of the coronary arteries in health and disease. Circulation. 1965;32(6):1020-33. 15. Rokey R, Chahine RA. Isolated left posterior fascicular block associatedwith acquired ventricular septal defect. Clin Cardiol. 1984;7(6):364-9. 16. Perez-Riera AR, de Abreu LC, Barbosa-Barros R, Nikus KC, Baranchuk A. R-Peak Time: An Electrocardiographic Parameter with Multiple Clinical Applications. Ann Noninvasive Electrocardiol. 2016;21(1):10-9. 17. Surawicz B, Childers R, Deal BJ, Gettes LS, Bailey JJ, Gorgels A, et al. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and theHeart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology. J Am Coll Cardiol. 2009;53(11):976-81. 18. Gambetta M, Childers RW. Rate-dependent right precordial Q waves: “septal focal block”. Am J Cardiol. 1973;32(2):196-201. 19. Durrer D, van Dam RT, Freud GE, Janse MJ, Meijler FL, Arzbaecher RC. Total excitation of the isolated human heart. Circulation. 1970;41(6):899-912. References This is an open-access article distributed under the terms of the Creative Commons Attribution License 5