Clinical, Structural and Mechanical Features in Patients With Left Bundle Branch Block.

Left Bundle-Branch Block Clinical Trial

Official title:

Clinical, Structural and Mechanical Features in Patients With Left Bundle Branch Block: an Observational and Prospective Study.

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT04328649
• Other study ID #: PoliclinicoCasilino
• Status: Not yet recruiting
• Start date: May 15, 2020
• Est. completion date: April 15, 2025

Study information

• Verified date: May 2020
• Source: Policlinico Casilino ASL RMB
• Contact: Leonardo Calò, Professor
• Phone: 0623188406
• Email: leonardo.calo[@]gmail.com
• Is FDA regulated: No
• Study type: Observational [Patient Registry]

Clinical Trial Summary

Clinical, structural and mechanical features in patients with left bundle branch block.

Description:

Left bundle-branch block (LBBB) is an electrocardiographic marker often associated with underlying cardiac disease (such as coronary artery disease, dilated cardiomyopathy, etc) but in some cases it is also found in patients with isolated LBBB defined as "none apparent structural heart disease".

Several investigations in animal and human study have showed a different electroanatomical activation in isolated LBBB when compared to LBBB in heart failure patients mostly due to coronary artery disease. The sequence of endocardial activation through the left ventricle has also proven to be heterogeneous in heart failure occuring at different septal regions. This electrical and mechanical variability seems to be related to location of LBBB block or lesion that could be proximal, distal or diffuse, consequently influencing also electrocardiographic aspects.

These considerations explain and justify the great variability in the proposed "true or typical LBBB" definitions (derived from from Strauss, Perrin and Marican definitions and from Heart Association/American College Cardiology Foundation/ European Society of Cardiology guidelines) but also shift attention to relatively new concept of atypical LBBB definitions with extreme left or right axis deviation and of non specific intraventricular conduction delay defined as a wide QRS (≥110 ms) without the appearance of left and right bundle-branch block. In fact, several investigations have shown that QRS axis deviation is a predictor of unfavorable outcome after cardiac resynchronization therapy and LBBB. The less favorable outcome of cardiac resynchronization therapy candidates with LBBB and left axis deviation seems to be associated to the presence of a shorter activation delay, scar tissue and left ventricular hypertrophy. Moreover, actual LBBB definitions recommended by guidelines in cardiac resynchronization therapy patients differ significantly and only individual ECG criteria (such as electrocardiographic intervals QS or RS in lead V1, notch and no q wave in lead V5, V6, I and avL) seems to be associated to clinical outcome when compared with combining criteria.

Finally, a frequent dyssynchrony of ventricular activation due to LBBB may be responsible for a dyssynchrony-related cardiomyopathy that needs to be identified early and differentiated from other forms of dilated cardiomyopathy through a multiparametric approach such as genetic, clinical data, electrocardiography and cardiac magnetic resonance. In fact, in isolated LBBB undergone cardiac magnetic resonance it was observed a greater left ventricular volumes and lower global left ventricular Ejection Fraction despite the absence of cardiovascular disease as compared with control subject. Despite this, comparison between isolated LBBB and structural heart disease shows a different myocardial mechanism all the more unfavourable the more significant is the presence of underlying myocardial scarring. In the other hand, isolated LBBB, dyssynchrony-related cardiomyopathy and myocardial scarring could present different temporal phase in the clinical history of the same patient and that must be early identified.

The aim of this present large‐scale prospective observational study is to evaluate 1) clinical, electrocardiographic and imaging features in a population of patients with typical and atypical LBBB and " non specific intraventricular conduction delay" pattern during a long-term follow up and 2) association among eventual different LBBB patterns (typical, atypical (LBBB and extreme left and/or right axis deviation, fragmentation) and " non specific intraventricular conduction delay " pattern and tissue characterization, mechanical myocardial activation and perfusion. 3) a possible time-related evolution from "non specific intraventricular conduction delay" patterns to typical or atypical LBBB.

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 250
• Est. completion date: April 15, 2025
• Est. primary completion date: April 15, 2022
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Every patient with electrocardiographic diagnosis of LBBB admitted to our Cardiology Department and Ambulatory Care Unit

• ECG standard criteria from typical, atypical and NIVCD

• Patients who have given their informed consent in writing.

• Age = 18 years

Exclusion Criteria:

• Age <18 years

• Patients who have not given their informed consent in writing.

Related Conditions & MeSH terms

• Bundle-Branch Block
• Clinical Features
• Electrocardiographic Pattens
• Heart Block
• Left Bundle-Branch Block

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
Policlinico Casilino ASL RMB

References & Publications (12)

Akhtari S, Chuang ML, Salton CJ, Berg S, Kissinger KV, Goddu B, O'Donnell CJ, Manning WJ. Effect of isolated left bundle-branch block on biventricular volumes and ejection fraction: a cardiovascular magnetic resonance assessment. J Cardiovasc Magn Reson. 2018 Sep 20;20(1):66. doi: 10.1186/s12968-018-0457-8. — View Citation

Eschalier R, Ploux S, Ritter P, Haïssaguerre M, Ellenbogen KA, Bordachar P. Nonspecific intraventricular conduction delay: Definitions, prognosis, and implications for cardiac resynchronization therapy. Heart Rhythm. 2015 May;12(5):1071-9. doi: 10.1016/j.hrthm.2015.01.023. Epub 2015 Jan 19. Review. — View Citation

European Society of Cardiology (ESC); European Heart Rhythm Association (EHRA), Brignole M, Auricchio A, Baron-Esquivias G, Bordachar P, Boriani G, Breithardt OA, Cleland J, Deharo JC, Delgado V, Elliott PM, Gorenek B, Israel CW, Leclercq C, Linde C, Mont L, Padeletti L, Sutton R, Vardas PE. 2013 ESC guidelines on cardiac pacing and cardiac resynchronization therapy: the task force on cardiac pacing and resynchronization therapy of the European Society of Cardiology (ESC). Developed in collaboration with the European Heart Rhythm Association (EHRA). Europace. 2013 Aug;15(8):1070-118. doi: 10.1093/europace/eut206. Epub 2013 Jun 24. — View Citation

Kisiel R, Fijorek K, Moskal P, Kukla P, Pavlinec C, Stec J, Czarnecka D, Jastrzebski M. True left bundle branch block and long-term mortality in cardiac resynchronisation therapy patients. Kardiol Pol. 2019;77(3):371-379. doi: 10.5603/KP.a2019.0032. Epub 2019 Feb 25. — View Citation

Padanilam BJ, Morris KE, Olson JA, Rippy JS, Walsh MN, Subramanian N, Vidal A, Prystowsky EN, Steinberg LA. The surface electrocardiogram predicts risk of heart block during right heart catheterization in patients with preexisting left bundle branch block: implications for the definition of complete left bundle branch block. J Cardiovasc Electrophysiol. 2010 Jul;21(7):781-5. doi: 10.1111/j.1540-8167.2009.01714.x. Epub 2010 Feb 1. — View Citation

Sanna GD, Merlo M, Moccia E, Fabris E, Masia SL, Finocchiaro G, Parodi G, Sinagra G. Left bundle branch block-induced cardiomyopathy: a diagnostic proposal for a poorly explored pathological entity. Int J Cardiol. 2020 Jan 15;299:199-205. doi: 10.1016/j.ijcard.2019.06.008. Epub 2019 Jun 4. — View Citation

Storkås HS, Hansen TF, Tahri JB, Lauridsen TK, Olsen FJ, Borgquist R, Vinther M, Lindhardt TB, Bruun NE, Søgaard P, Risum N. Left axis deviation in patients with left bundle branch block is a marker of myocardial disease associated with poor response to cardiac resynchronization therapy. J Electrocardiol. 2019 Apr 5. pii: S0022-0736(18)30914-2. doi: 10.1016/j.jelectrocard.2019.04.007. [Epub ahead of print] — View Citation

Strauss DG, Selvester RH, Wagner GS. Defining left bundle branch block in the era of cardiac resynchronization therapy. Am J Cardiol. 2011 Mar 15;107(6):927-34. doi: 10.1016/j.amjcard.2010.11.010. Review. — View Citation

Strauss DG, Selvester RH. The QRS complex--a biomarker that "images" the heart: QRS scores to quantify myocardial scar in the presence of normal and abnormal ventricular conduction. J Electrocardiol. 2009 Jan-Feb;42(1):85-96. doi: 10.1016/j.jelectrocard.2008.07.011. Epub 2008 Sep 13. Review. — View Citation

Strik M, Regoli F, Auricchio A, Prinzen F. Electrical and mechanical ventricular activation during left bundle branch block and resynchronization. J Cardiovasc Transl Res. 2012 Apr;5(2):117-26. doi: 10.1007/s12265-012-9351-1. Epub 2012 Feb 7. Review. — View Citation

Surawicz B, Childers R, Deal BJ, Gettes LS, Bailey JJ, Gorgels A, Hancock EW, Josephson M, Kligfield P, Kors JA, Macfarlane P, Mason JW, Mirvis DM, Okin P, Pahlm O, Rautaharju PM, van Herpen G, Wagner GS, Wellens H; American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; American College of Cardiology Foundation; Heart Rhythm Society. 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 the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology. J Am Coll Cardiol. 2009 Mar 17;53(11):976-81. doi: 10.1016/j.jacc.2008.12.013. Review. — View Citation

van Stipdonk AMW, Hoogland R, Ter Horst I, Kloosterman M, Vanbelle S, Crijns HJGM, Prinzen FW, Meine M, Maass AH, Vernooy K. Evaluating Electrocardiography-Based Identification of Cardiac Resynchronization Therapy Responders Beyond Current Left Bundle Branch Block Definitions. JACC Clin Electrophysiol. 2020 Feb;6(2):193-203. doi: 10.1016/j.jacep.2019.10.009. Epub 2019 Nov 27. — View Citation

* Note: There are 12 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Rate of ECG pattern distribution in LBBB patients		5 years
Primary	Rate of underlying structural heart diseases in different LBBB pattern		5 years
Primary	Number of participants with stress induced myocardial ischemia during Stress Magnetic resonance		5 years
Primary	number or participants with late gadolinium enhancement during cardiac magnetic resonance		5 years
Primary	number and of participants with isolated LBBB evolving to dyssynchrony-related cardiomyopathy		5 years
Primary	Number of participants with mechanical dyssynchrony evaluated with Echocardiography	Strain, Strain Rate, intraventricular timing Delay between left ventricular lateral and Septal wall	5 years