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. 2024 Feb 26;17(4):491-501.
doi: 10.1016/j.jcin.2023.12.017. Epub 2024 Feb 7.

Presence and Relevance of Myocardial Bridge in LAD-PCI of CTO and Non-CTO Lesions

Kei Yamamoto  1 , Yoichiro Sugizaki  1 , Dimitri Karmpaliotis  2 , Takao Sato  1 , Mitsuaki Matsumura  3 , Shuro Narui  4 , Myong Hwa Yamamoto  4 , Khady N Fall  5 , Elizabeth I James  5 , John B Glinski  5 , Maya L Rabban  5 , Megha Prasad  5 , Vivian G Ng  5 , Sanjum S Sethi  5 , Tamim M Nazif  1 , Sahil A Parikh  1 , Torsten P Vahl  1 , Ziad A Ali  6 , LeRoy E Rabbani  1 , Michael B Collins  5 , Martin B Leon  1 , Margaret McEntegart  1 , Jeffrey W Moses  7 , Ajay J Kirtane  1 , Masahiko Ochiai  4 , Gary S Mintz  3 , Akiko Maehara  8
Affiliations

Presence and Relevance of Myocardial Bridge in LAD-PCI of CTO and Non-CTO Lesions

Kei Yamamoto et al. JACC Cardiovasc Interv. .

Abstract

Background: Intravascular ultrasound (IVUS) studies show that one-quarter of left anterior descending (LAD) arteries have a myocardial bridge. An MB may be associated with stent failure when the stent extends into the MB.

Objectives: The aim of this study was to investigate: 1) the association between an MB and chronic total occlusion (CTO) in any LAD lesions; and 2) the association between an MB and subsequent clinical outcomes after percutaneous coronary intervention in LAD CTOs.

Methods: A total of 3,342 LAD lesions with IVUS-guided percutaneous coronary intervention (280 CTO and 3,062 non-CTO lesions) were included. The primary outcome was target lesion failure (cardiac death, target vessel myocardial infarction, definite stent thrombosis, and ischemic-driven target lesion revascularization).

Results: An MB by IVUS was significantly more prevalent in LAD CTOs than LAD non-CTOs (40.4% [113/280] vs 25.8% [789/3,062]; P < 0.0001). The discrepancy in CTO length between angiography and IVUS was greater in 113 LAD CTOs with an MB than 167 LAD CTOs without an MB (6.0 [Q1, Q3: 0.1, 12.2] mm vs 0.2 [Q1, Q3: -1.4, 8.4] mm; P < 0.0001). Overall, 48.7% (55/113) of LAD CTOs had a stent that extended into an MB after which target lesion failure was significantly higher compared to a stent that did not extend into an MB (26.3% vs 0%; P = 0.0004) or compared to an LAD CTO without an MB (26.3% vs 9.6%; P = 0.02).

Conclusions: An MB was more common in LAD CTO than non-CTO LAD lesions. If present, approximately one-half of LAD CTOs had a stent extending into an MB that, in turn, was associated with worse outcomes.

Keywords: chronic total occlusion; left anterior descending artery; myocardial bridge; percutaneous coronary intervention.

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Conflict of interest statement

Funding Support and Author Disclosures Dr Karmpaliotis has received honoraria from Boston Scientific and Abbot Vascular; and holds equity in Saranas Soundbite and Traverse Vascular. Dr Matsumura is a consultant for Terumo Corporation and Boston Scientific. Dr Fall is a consultant for INFRAREDX and Boston Scientific. Dr Prasad is a consultant for CONAVI, Neovasc, Abbott Vascular, Cardinol, Chiesi, and Boehringer Ingelheim; and is on the Speakers Bureau for CONAVI, Neovasc, Abbott Vascular, Cardinol, Chiesi, and Boehringer Ingelheim. Dr Ng has received honoraria from Edwards Lifesciences and Medtronic. Dr Parikh has received research grants from Abbott, Boston Scientific, Medtronic, Phillips, Cordis, Jannsen; is a consultant for Inari, Penumbra, Terumo, and Canon; and holds equity in eFemoral, Advanced Nano Therapies, and Encompass Vascular. Dr Ali has received grants from Abbott Vascular and CSI; is a consultant for Amgen, AstraZeneca, and Boston Scientific; and holds equity for Shockwave. Dr Leon has received institutional clinical research grants from Abbott Vascular, Boston Scientific, and Medtronic. Dr McEntegart has received honoraria from Boston Scientific, Abbot Vascular, Shockwave Medical, Teleflex, and Biosensors. Dr Moses holds equity in Orchestra Biomed and Xenter. Dr Kirtane has received institutional funding to Columbia University and/or Cardiovascular Research Foundation from Medtronic, Boston Scientific, Abbott Vascular, Abiomed, CSI, Siemens, Philips, ReCor Medical, and Neurotronic; has received institutional funding including fees paid to Columbia University and/or Cardiovascular Research Foundation for consulting and/or speaking engagements in which Dr Kirtane controlled the content; is a consultant for IMDS; and has received travel expenses/meals from Medtronic, Boston Scientific, Abbott Vascular, Abiomed, CSI, Siemens, Philips, ReCor Medical, Chiesi, OpSens, Zoll, and Regeneron. Dr Ochiai has received consulting fees from Abbott, Asahi Intecc, Boston Scientific, and Terumo. Dr Mintz has received honoraria from Boston Scientific, Philips, SpectraWave, and Gentuity. Dr Maehara has received research grants from Boston Scientific and Abbott Vascular; and is a consultant for Boston Scientific and Philips. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.

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