1
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Lamendola P, Cambise N, Di Renzo A, Tinti L, De Vita A, Tremamunno S, Pastena P, Belmusto A, Montone RA, Rinaldi R, Villano A, Lanza GA. Assessment of the Ischaemic Effects of Myocardial Bridge by Echocardiographic Exercise Stress Test. Eur Cardiol 2024; 19:e09. [PMID: 38983580 PMCID: PMC11231813 DOI: 10.15420/ecr.2024.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 03/12/2024] [Indexed: 07/11/2024] Open
Abstract
Background Detection of myocardial bridge (MB) at angiography suggests it has a role in ischaemic-related symptoms in patients with angina without obstructive coronary artery disease. However, evidence that MB may cause myocardial ischaemia is limited. Methods We studied 41 patients with MB of the left anterior descending coronary artery and otherwise normal coronary arteries. Fourteen patients with normal coronary arteries and without MB served as controls. All subjects underwent a maximal treadmill exercise stress test (EST) under ECG monitoring. Standard and speckle-tracking echocardiography were performed at baseline and immediately after peak EST. Results EST duration and peak heart rate and systolic pressure were similar in the two groups. A positive EST (ST-segment depression .1 mm) was found in 18 patients in the MB group (43.9%) and none in the control group (p=0.001). No abnormalities in both left ventricle systolic and diastolic function were found between the two groups in the standard echocardiographic evaluation. Global and segmental (anterior, inferior) longitudinal strain (LS) did not differ at baseline between the groups. There was a small increase in global LS during EST in MB patients but not in the control group (p=0.01). Similar trends were found for regional LSs, with differences being significant for the medium (p=0.028) and apical (p=0.032) anterior segments. No differences in echocardiographic parameters and both global and segmental LSs were observed between MB patients with ischaemic ECG changes during EST versus those without. Conclusion Our findings do not support the notion that MB results in significant degrees of myocardial ischaemia during maximal myocardial work.
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Affiliation(s)
- Priscilla Lamendola
- Department of Cardiovascular Sciences, Fondazione Policlinico Universatario A Gemelli IRCCSRome, Italy
| | - Nello Cambise
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Antonio Di Renzo
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Lorenzo Tinti
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Antonio De Vita
- Department of Cardiovascular Sciences, Fondazione Policlinico Universatario A Gemelli IRCCSRome, Italy
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Saverio Tremamunno
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Paola Pastena
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Antonietta Belmusto
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Rocco Antonio Montone
- Department of Cardiovascular Sciences, Fondazione Policlinico Universatario A Gemelli IRCCSRome, Italy
| | - Riccardo Rinaldi
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
| | - Angelo Villano
- Department of Cardiovascular Sciences, Fondazione Policlinico Universatario A Gemelli IRCCSRome, Italy
| | - Gaetano A Lanza
- Department of Cardiovascular Sciences, Fondazione Policlinico Universatario A Gemelli IRCCSRome, Italy
- Facoltà di Medicina e Chirurgia, Università Cattolica del Sacro CuoreRome, Italy
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2
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Sakamoto T, Usui E, Hoshino M, Hada M, Nagamine T, Hanyu Y, Nogami K, Ueno H, Setoguchi M, Tahara T, Matsuda K, Mineo T, Wakasa N, Sugiyama T, Yonetsu T, Sasano T, Kakuta T. Association of Coronary Computed Tomography-Defined Myocardial Bridge With Pre- and Post-Procedural Fractional Flow Reserve in Patients Undergoing Elective Percutaneous Coronary Intervention. Circ J 2024:CJ-23-0934. [PMID: 38763754 DOI: 10.1253/circj.cj-23-0934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/21/2024]
Abstract
BACKGROUND Myocardial bridge (MB) is a common coronary anomaly characterized by a tunneled course through the myocardium. Coronary computed tomography angiography (CCTA) can identify MB. The impact of MB detected by CCTA on coronary physiological parameters before and after percutaneous coronary intervention (PCI) is unknown.Methods and Results: We investigated 141 consecutive patients who underwent pre-PCI CCTA and fractional flow reserve (FFR)-guided elective PCI for de novo single proximal lesions in the left anterior descending artery (LAD). We compared clinical demographics and physiological parameters between patients with and without CCTA-defined MB. MB was identified in 46 (32.6%) patients using pre-PCI CCTA. The prevalence of diabetes was higher among patients with MB. Median post-PCI FFR values were significantly lower among patients with than without MB (0.82 [interquartile range 0.79-0.85] vs. 0.85 [interquartile range 0.82-0.89]; P=0.003), whereas pre-PCI FFR values were similar between the 2 groups. Multivariable linear regression analysis revealed that the presence of MB and greater left ventricular mass volume in the LAD territory were independently associated with lower post-PCI FFR values. Multivariable logistic regression analysis also revealed that the presence of MB and lower pre-PCI FFR values were independent predictors of post-PCI FFR values ≤0.80. CONCLUSIONS CCTA-defined MB independently predicted both lower post-PCI FFR as a continuous variable and ischemic FFR as a categorical variable in patients undergoing elective PCI for LAD.
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Affiliation(s)
- Tatsuya Sakamoto
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Eisuke Usui
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Masahiro Hoshino
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Masahiro Hada
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | | | - Yoshihiro Hanyu
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Kai Nogami
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Hiroki Ueno
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Mirei Setoguchi
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Tomohiro Tahara
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Kazuki Matsuda
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Takashi Mineo
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
| | - Nobutaka Wakasa
- Department of Clinical Laboratory, Tsuchiura Kyodo General Hospital
| | - Tomoyo Sugiyama
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University
| | - Taishi Yonetsu
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University
| | - Tetsuo Sasano
- Department of Cardiovascular Medicine, Tokyo Medical and Dental University
| | - Tsunekazu Kakuta
- Department of Cardiovascular Medicine, Tsuchiura Kyodo General Hospital
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3
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Xu R, Yang H, Zhang J, Chen S, Pang L, Wu Y, Pei Z, Shi H, Li C, Ge J. Dynamic perfusion SPECT for functional evaluation in symptomatic patients with myocardial bridging. J Nucl Cardiol 2023; 30:2058-2067. [PMID: 37095328 DOI: 10.1007/s12350-023-03241-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 01/28/2023] [Indexed: 04/26/2023]
Abstract
BACKGROUND The aim of this study was to investigate the feasibility and diagnostic value of myocardial flow reserve (MFR) assessed by rest/stress myocardial perfusion imaging with dynamic single-photon emission computed tomography (SPECT) in the functional evaluation of myocardial bridge (MB). METHODS From May 2017 to July 2021, patients with angiographically confirmed isolated MB on the left anterior descending artery (LAD) who underwent dynamic SPECT myocardial perfusion imaging were retrospectively included. The assessment of semiquantitative indices of myocardial perfusion (summed stress scores, SSS) and quantitative parameters (MFR) was performed. RESULTS A total of 49 patients were enrolled. The mean age of the subjects was 61.0 ± 9.0 years. All of the patients were symptomatic, and 16 cases (32.7%) presented with typical angina. SPECT-derived MFR showed a borderline significantly negative correlation with SSS (r = 0.261, P = .070). There was a trend of higher prevalence of impaired myocardial perfusion defined as MFR < 2 than as SSS ≥ 4 (42.9% vs 26.5%; P = .090). CONCLUSION Our data support that SPECT MFR may be a useful parameter for the functional assessment of MB. In patients with MB, the use of dynamic SPECT could be a potential method for hemodynamic assessment.
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Affiliation(s)
- Rende Xu
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Hao Yang
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Jie Zhang
- Department of Nuclear Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Shuguang Chen
- Department of Nuclear Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Lifang Pang
- Department of Nuclear Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Yizhe Wu
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Zhiqiang Pei
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Hongcheng Shi
- Department of Nuclear Medicine, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China
| | - Chenguang Li
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.
| | - Junbo Ge
- Department of Cardiology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.
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Guerra E, Bergamaschi L, Tuttolomondo D, Pizzi C, Sartorio D, Gaibazzi N. Contrast Stress Echocardiography Findings in Myocardial Bridging Compared to Normal Coronary Course, With and Without Coronary Artery Disease. J Am Soc Echocardiogr 2023; 36:1092-1099. [PMID: 37356674 DOI: 10.1016/j.echo.2023.06.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/13/2023] [Accepted: 06/17/2023] [Indexed: 06/27/2023]
Abstract
BACKGROUND Myocardial bridging (MB) correlation with ischemia remains a diagnostic challenge. There is a lack of studies that have assessed MB using contrast stress echo and compared the findings with those in patients demonstrating a normal coronary course, with or without obstructive coronary artery disease (CAD). METHODS We evaluated all consecutive patients who underwent contrast stress echocardiography and coronary computed tomography angiography (CCTA) due to suspected symptoms of CAD within 3 months in Parma Hospital. Coronary computed tomography angiography served as the reference standard for detecting MB and obstructive CAD. The patients were divided into 3 groups: (1) MB and no evidence of obstructive CAD (MB group, N = 64), (2) no evidence of obstructive CAD or MB (NoCAD group, N = 135), (3) obstructive CAD without MB (CAD group, N = 68). RESULTS The coronary flow velocity reserve in the LAD (CFVR-LAD) was reduced in the MB and CAD groups, measuring 1.91 ± 0.21 and 1.82 ± 0.28, respectively, whereas it was 2.27 ± 0.34 in the NoCAD group (P < .001). The MB and CAD groups exhibited a higher prevalence of reversible myocardial perfusion defects (rMPDs) compared to the NoCAD group (57.8% vs 64.7% vs 3.7%, P < .001). Reversible wall motion abnormalities were frequently observed in the CAD group and rarely found in the MB and NoCAD groups (47.1% vs 18.8% vs 4.4%, P < .001). In multivariable analyses, the presence of MB was independently associated with reduced CFVR-LAD (odds ratio = 14.55; 95% CI, 6.84-30.93; P < .001) and the presence of rMPD (odds ratio = 37.96; 95% CI, 13.49-106.84; P < .001). Patients with deep MB (>2 mm depth) and very deep MB (≥5 mm depth) exhibited significantly greater CFVR-LAD reduction and rMPD than those with superficial MB. CONCLUSIONS Myocardial bridging is capable of inducing rMPD and reducing CFVR-LAD similar to obstructive CAD. The depth of the MB correlates with the abnormalities found in the stress echo evaluation. Contrast stress echo may serve as a valuable noninvasive tool for evaluating patients with MB.
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Affiliation(s)
- Emiliano Guerra
- Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico Di Modena, Modena, Italy
| | - Luca Bergamaschi
- Cardiology Unit, Cardiac Thoracic and Vascular Department, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; Department of Medical and Surgical Sciences, DIMEC, Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - Domenico Tuttolomondo
- Cardiology Division, Parma University Hospital, Azienda Ospedaliero-Universitaria di Parma, Parma, Italy
| | - Carmine Pizzi
- Cardiology Unit, Cardiac Thoracic and Vascular Department, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy; Department of Medical and Surgical Sciences, DIMEC, Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - Daniele Sartorio
- Cardiology Division, Parma University Hospital, Azienda Ospedaliero-Universitaria di Parma, Parma, Italy
| | - Nicola Gaibazzi
- Cardiology Division, Parma University Hospital, Azienda Ospedaliero-Universitaria di Parma, Parma, Italy; PacC Heart Centre, Parma, Italy.
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5
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Evbayekha EO, Nwogwugwu E, Olawoye A, Bolaji K, Adeosun AA, Ajibowo AO, Nsofor GC, Chukwuma VN, Shittu HO, Onuegbu CA, Adedoyin AM, Okobi OE. A Comprehensive Review of Myocardial Bridging: Exploring Diagnostic and Treatment Modalities. Cureus 2023; 15:e43132. [PMID: 37692750 PMCID: PMC10484041 DOI: 10.7759/cureus.43132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/08/2023] [Indexed: 09/12/2023] Open
Abstract
Myocardial bridging (MB) is a congenital coronary artery anomaly involving an overlying myocardium's partial or complete encasement of a coronary artery segment. The obstruction can lead to significant cardiac symptoms, resulting in myocardial ischemia, arrhythmia, and sudden cardiac death. Several approaches, including invasive and non-invasive methods, have been proposed to diagnose and manage MB. Invasive modalities, such as intravascular ultrasound (IVUS) and coronary angiography, offer high specificity and sensitivity. In contrast, non-invasive methods like Doppler ultrasound, multislice computed tomography (MSCT), and magnetic resonance imaging (MRI) are advantageous due to their non-invasive nature, high sensitivity and specificity, and cost-effectiveness. Treatment options for MB mainly focus on relieving symptoms and preventing adverse outcomes. The use of pharmacological agents and surgical and percutaneous interventions has been documented in numerous studies. Studies conclude that MB is a treatable cardiac anomaly, and a combined approach of diagnosis, treatment, and follow-up is necessary to reduce the morbidity and mortality associated with this condition.
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Affiliation(s)
| | - Enyioma Nwogwugwu
- Internal Medicine, Lincoln Medical and Mental Health Center, New York, USA
| | | | | | - Adeyemi A Adeosun
- Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, USA
| | | | - G Chinenye Nsofor
- Internal Medicine, Buckinghamshire Healthcare NHS Trust, Buckinghamshire, GBR
| | - Vivian N Chukwuma
- Internal Medicine, University of Illinois at Chicago/Advocate Christ Medical Center, Chicago, USA
| | | | | | | | - Okelue E Okobi
- Family Medicine, Medficient Health Systems, Laurel, USA
- Family Medicine, Lakeside Medical Center, Belle Glade, USA
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6
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Oh S, Hyun DY, Cho SG, Hong YJ, Kim JH, Ahn Y, Jeong MH. Case report: A fatal case of myocardial infarction due to myocardial bridge and concomitant vasospasm: the role of stress gated SPECT. Front Cardiovasc Med 2023; 10:1188095. [PMID: 37324639 PMCID: PMC10265674 DOI: 10.3389/fcvm.2023.1188095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 05/10/2023] [Indexed: 06/17/2023] Open
Abstract
Introduction Although most cases of myocardial bridge (MB) are clinically benign, sometimes it can be one of potential threats of myocardial infarction (MI) and life-threatening arrhythmia. In the present study, we present a case of ST-segment elevation MI caused by MB and concomitant vasospasm. Case Presentation A 52-year-old woman was brought to our tertiary hospital due to resuscitated cardiac arrest. Because the 12-lead electrocardiogram indicated ST-segment elevation MI, coronary angiogram was promptly commenced, which showed near-total occlusion at the middle portion of left anterior descending coronary artery (LAD). After intracoronary nitroglycerin administration, this occlusion was dramatically relieved, however, systolic compression at this site remained, indicative of myocardial bridge (MB). Intravascular ultrasound also showed eccentric compression with a "half-moon" sign, which is consistent with MB. Coronary computed tomography also showed a bridged coronary segment surrounded by myocardium at the middle portion of LAD. To assess the severity and extent of myocardial damages and ischemia, myocardial single photon emission computed tomography (SPECT) was additionally conducted, showing a moderate fixed perfusion defect around the cardiac apex, suggesting MI. After receiving optimal medical therapy, the patient's clinical symptoms and signs were improved then the patient was discharged from the hospital successfully and uneventfully. Conclusion We demonstrated a case of MB-induced ST-segment elevation MI which was confirmed with its perfusion defects via myocardial perfusion SPECT. There have been proposed a number of diagnostic modalities to examine its anatomic and physiologic significance. Among them, myocardial perfusion SPECT can be available as one of useful modalities to evaluate the severity and extent of myocardial ischemia in patients with MB.
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Affiliation(s)
- Seok Oh
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Dae Young Hyun
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Sang-Geon Cho
- Department of Nuclear Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Young Joon Hong
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Ju Han Kim
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Youngkeun Ahn
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Myung Ho Jeong
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea
- Department of Cardiology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
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7
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Abadie B, Jaber W. Dobutamine stress PET/CT for assessment of hemodynamic significance of coronary myocardial bridges. J Nucl Cardiol 2022; 29:1447-1451. [PMID: 34355308 DOI: 10.1007/s12350-021-02759-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 07/19/2021] [Indexed: 10/20/2022]
Abstract
Myocardial bridges are common and often benign, but can cause hemodynamically significant obstruction of blood flow with stress. Dobutamine stress positron emission tomography/computed tomography (PET/CT) is a powerful tool for non-invasively assessing for ischemia. We present a case of using dobutamine stress PET/CT to determine the significance of a myocardial bridge.
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8
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Sternheim D, Power DA, Samtani R, Kini A, Fuster V, Sharma S. Myocardial Bridging: Diagnosis, Functional Assessment, and Management: JACC State-of-the-Art Review. J Am Coll Cardiol 2021; 78:2196-2212. [PMID: 34823663 DOI: 10.1016/j.jacc.2021.09.859] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/20/2021] [Accepted: 09/27/2021] [Indexed: 02/08/2023]
Abstract
Myocardial bridging (MB) is a congenital coronary anomaly in which a segment of the epicardial coronary artery traverses through the myocardium for a portion of its length. The muscle overlying the artery is termed a myocardial bridge, and the intramyocardial segment is referred to as a tunneled artery. MB can occur in any coronary artery, although is most commonly seen in the left anterior descending artery. Although traditionally considered benign in nature, increasing attention is being given to specific subsets of MB associated with ischemic symptomatology. The advent of contemporary functional and anatomic imaging modalities, both invasive and noninvasive, have dramatically improved our understanding of dynamic pathophysiology associated with MBs. This review provides a contemporary overview of epidemiology, pathobiology, diagnosis, functional assessment, and management of MBs.
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Affiliation(s)
- David Sternheim
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - David A Power
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA. https://twitter.com/rowpower
| | - Rajeev Samtani
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Anapoorna Kini
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Valentin Fuster
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Samin Sharma
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
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9
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Adam EL, Generoso G, Bittencourt MS. Anomalous Coronary Arteries: When to Follow-up, Risk Stratify, and Plan Intervention. Curr Cardiol Rep 2021; 23:102. [PMID: 34196813 DOI: 10.1007/s11886-021-01535-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/17/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW Coronary artery anomalies are a diverse group of entities, ranging from benign variations of normal anatomy to life-threatening conditions. There is, however, no universal consensus in their classification, risk stratification, and management. The aim of this review is to develop a straightforward clinical approach for the assessment and care of patients with anomalous coronary arteries. RECENT FINDINGS Autopsy series and population screening studies have recently provided useful clinical data on the prevalence and outcomes of coronary anomalies. Also, findings on coronary computed tomography angiography, magnetic resonance imaging, and invasive angiography, enriched with fractional flow reserve and intravascular ultrasound, have allowed identification of several high-risk features associated with specific coronary anomalies. Management of patients with anomalous coronary arteries requires an individualized approach based on clinical, physiological, and anatomic features. High-quality studies are paramount for further development of this fascinating field.
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Affiliation(s)
| | - Giuliano Generoso
- University Hospital, University of Sao Paulo School of Medicine, Sao Paulo, Brazil
| | - Marcio Sommer Bittencourt
- University Hospital, University of Sao Paulo School of Medicine, Sao Paulo, Brazil.
- DASA, Sao Paulo, Brazil.
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10
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Said SM, Marey G, Hiremath GM. Unroofing of Myocardial Bridging After Septal Myectomy in a Child With Noonan Syndrome. World J Pediatr Congenit Heart Surg 2020; 12:659-660. [PMID: 32772794 DOI: 10.1177/2150135120943869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Myocardial bridging is a controversial topic that remained with no well-defined management protocol. We present a ten-year-old child with Noonan syndrome and a myocardial bridge.
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Affiliation(s)
- Sameh M Said
- Division of Pediatric Cardiovascular Surgery, Masonic Children's Hospital, University of Minnesota, Minneapolis, MN, USA
| | - Gamal Marey
- Division of Pediatric Cardiovascular Surgery, Masonic Children's Hospital, University of Minnesota, Minneapolis, MN, USA
| | - Gurumurthy M Hiremath
- Division of Pediatric Cardiology, Masonic Children's Hospital, University of Minnesota, Minneapolis, MN, USA
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11
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Murtaza G, Mukherjee D, Gharacholou SM, Nanjundappa A, Lavie CJ, Khan AA, Shanmugasundaram M, Paul TK. An Updated Review on Myocardial Bridging. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2020; 21:1169-1179. [PMID: 32173330 DOI: 10.1016/j.carrev.2020.02.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 02/03/2020] [Accepted: 02/17/2020] [Indexed: 02/08/2023]
Abstract
Myocardial bridging is a congenital coronary anomaly with normal epicardial coronary artery taking an intra-myocardial course also described as tunneled artery. The majority of patients with this coronary anomaly are asymptomatic and generally it is a benign condition. However, it is an important cause of myocardial ischemia, which may lead to anginal symptoms, acute coronary syndrome, cardiac arrhythmias and rarely sudden cardiac death. There are numerous studies published in the recent past on understanding the pathophysiology, diagnostic and management strategies of myocardial bridging. This review highlights some of the recent updates in the diagnosis and management of patients with myocardial bridging. We discuss the role of various non-invasive and invasive diagnostic methods to evaluate functional significance of bridging. In addition, role of medical therapy such as beta-blockers, percutaneous coronary intervention with stents/bioresorbable scaffolds and surgical unroofing in patients unresponsive to medical therapy is highlighted as well.
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Affiliation(s)
- Ghulam Murtaza
- Department of Internal Medicine, Division of Cardiology, East Tennessee State University, Johnson City, TN, USA
| | - Debabrata Mukherjee
- Division of Cardiology, Department of Internal Medicine, Texas Tech University, TX, USA
| | | | | | - Carl J Lavie
- Department of Cardiology, Ochsner Clinic, New Orleans, LA, USA
| | - Abdul Ahad Khan
- Department of Internal Medicine, Division of Cardiology, East Tennessee State University, Johnson City, TN, USA
| | | | - Timir K Paul
- Department of Internal Medicine, Division of Cardiology, East Tennessee State University, Johnson City, TN, USA.
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12
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Monroy-Gonzalez AG, Alexanderson-Rosas E, Prakken NHJ, Juarez-Orozco LE, Walls-Laguarda L, Berrios-Barcenas EA, Meave-Gonzalez A, Groot JC, Slart RHJA, Tio RA. Myocardial bridging of the left anterior descending coronary artery is associated with reduced myocardial perfusion reserve: a 13N-ammonia PET study. Int J Cardiovasc Imaging 2019; 35:375-382. [PMID: 30267168 PMCID: PMC6428791 DOI: 10.1007/s10554-018-1460-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 07/20/2018] [Indexed: 12/30/2022]
Abstract
Myocardial Bridging (MB) refers to the band of myocardium that abnormally overlies a segment of a coronary artery. This paper quantitatively evaluates the influence of MB of the left anterior descending artery (LAD) on myocardial perfusion of the entire left ventricle. We studied 131 consecutive patients who underwent hybrid rest/stress 13N-ammonia positron emission tomography (PET) and coronary computed tomography angiography (CCTA) due to suspected myocardial ischemia. Patients with previous myocardial infarction and/or significant coronary artery disease (≥ 50% stenosis) were excluded. Myocardial perfusion measurements were compared between patients with and without LAD-MB. Additionally, we evaluated the relationship between anatomical characteristics (length and depth) of LAD-MB and myocardial perfusion measurements. 17 (13%) patients presented a single LAD-MB. Global myocardial perfusion reserve (MPR) was lower in patients with LAD-MB than in patients without LAD-MB (1.9 ± 0.5 vs. 2.3 ± 0.6, p < 0.01). Global stress myocardial blood flow (MBF) was similar in patients with and without LAD-MB (2.2 ± 0.4 vs. 2.3 ± 0.7 ml/g/min, p = 0.40). Global rest MBF was higher in patients with LAD-MB than in patients without LAD-MB (1.2 ± 0.3 vs. 1.0 ± 0.2 ml/g/min, p < 0.01). Global rest MBF, stress MBF, and MPR quantifications were similar in patients with superficial and deep LAD-MB (all p = NS). We did not find any correlation between length and global rest MBF, stress MBF nor MPR (r = - 0.14, p = 0.59; r = 0.44, p = 0.07; and r = 0.45, p = 0.07 respectively). Quantitative myocardial perfusion suggests that LAD-MB may be related to impaired perfusion reserve, an indicator of microvascular dysfunction. Anatomical characteristics of LAD-MB were not related to changes in myocardial perfusion.
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Affiliation(s)
- Andrea G. Monroy-Gonzalez
- Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Erick Alexanderson-Rosas
- National Institute of Cardiology Ignacio Chavez, Mexico City, Mexico
- Department of Physiology, National Autonomous University of Mexico, Mexico City, Mexico
| | - Niek H. J. Prakken
- Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Luis E. Juarez-Orozco
- Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | | | | | | | - Jan C. Groot
- Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Riemer H. J. A. Slart
- Medical Imaging Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Biomedical Photonic Imaging, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
| | - Rene A. Tio
- Department of Cardiology, Catharina Hospital, Eindhoven, The Netherlands
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13
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Maeda K, Schnittger I, Murphy DJ, Tremmel JA, Boyd JH, Peng L, Okada K, Pargaonkar VS, Hanley FL, Mitchell RS, Rogers IS. Surgical unroofing of hemodynamically significant myocardial bridges in a pediatric population. J Thorac Cardiovasc Surg 2018; 156:1618-1626. [PMID: 30005887 DOI: 10.1016/j.jtcvs.2018.01.081] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 12/22/2017] [Accepted: 01/09/2018] [Indexed: 11/15/2022]
Abstract
BACKGROUND Although myocardial bridges (MBs) are traditionally regarded as incidental findings, it has been reported that adult patients with symptomatic MBs refractory to medical therapy benefit from unroofing. However, there is limited literature in the pediatric population. The aim of our study was to evaluate the indications and outcomes for unroofing in pediatric patients. METHODS We retrospectively reviewed all pediatric patients with MB in our institution who underwent surgical relief. Clinical characteristics, relevant diagnostic data, intraoperative findings, and postoperative outcomes were evaluated. RESULTS Between 2012 and 2016, 14 pediatric patients underwent surgical unroofing of left anterior descending artery MBs. Thirteen patients had anginal symptoms refractory to medical therapy, and 1 patient was asymptomatic until experiencing aborted sudden cardiac arrest during exercise. Thirteen patients underwent exercise stress echocardiography, all of which showed mid-septal dys-synergy. Coronary computed tomography imaging confirmed the presence of MBs in all patients. Intravascular ultrasound imaging confirmed the length of MBs: 28.2 ± 16.3 mm, halo thickness: 0.59 ± 0.24 mm, and compression of left anterior descending artery at resting heart rate: 33.0 ± 11.6%. Invasive hemodynamic assessment with dobutamine confirmed the physiologic significance of the MBs with diastolic fractional flow reserve: 0.59 ± 0.13. Unroofing was performed with the patient under cardiopulmonary bypass (CPB) in the initial 9 cases and without CPB in the subsequent 5 cases. All patients were discharged without complications. The 13 symptomatic patients reported resolution of symptoms on follow-up, and improvement in symptoms and quality of life was documented using the Seattle Angina Questionnaire version 7. CONCLUSIONS Unroofing of MBs can be safely performed in pediatric patients, with or without use of CPB. In symptomatic patients, unroofing can provide relief of symptoms refractory to medical therapy.
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Affiliation(s)
- Katsuhide Maeda
- Department of Cardiothoracic Surgery, Stanford University, Stanford, Calif.
| | - Ingela Schnittger
- Department of Cardiovascular Medicine, Stanford University, Stanford, Calif
| | - Daniel J Murphy
- Department of Cardiovascular Medicine, Stanford University, Stanford, Calif
| | - Jennifer A Tremmel
- Department of Cardiovascular Medicine, Stanford University, Stanford, Calif
| | - Jack H Boyd
- Department of Cardiothoracic Surgery, Stanford University, Stanford, Calif
| | - Lynn Peng
- Department of Pediatric Cardiology, Stanford University, Stanford, Calif
| | - Kozo Okada
- Department of Cardiovascular Medicine, Stanford University, Stanford, Calif
| | | | - Frank L Hanley
- Department of Cardiothoracic Surgery, Stanford University, Stanford, Calif
| | | | - Ian S Rogers
- Department of Cardiovascular Medicine, Stanford University, Stanford, Calif
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14
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Hostiuc S, Rusu MC, Hostiuc M, Negoi RI, Negoi I. Cardiovascular consequences of myocardial bridging: A meta-analysis and meta-regression. Sci Rep 2017; 7:14644. [PMID: 29116137 PMCID: PMC5677117 DOI: 10.1038/s41598-017-13958-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 10/02/2017] [Indexed: 01/18/2023] Open
Abstract
Myocardial bridging, a congenital abnormality in which a coronary artery tunnels through the myocardial fibres was usually considered a benign condition. Many studies suggested a potential hemodynamic significance of myocardial bridging and some, usually case reports, implied a possible correlation between it and various cardiovascular pathologies like acute myocardial infarction, ventricular rupture, life-threatening arrhythmias, hypertrophic cardiomyopathy, apical ballooning syndrome or sudden death. The main objective of this article is to evaluate whether myocardial bridging may be associated with significant cardiac effects or if it is strictly a benign anatomical variation. To this purpose, we performed a meta-analysis (performed using the inverse variance heterogeneity model) and meta-regression, on scientific articles selected from three main databases (Scopus, Web of Science, Pubmed). The study included 21 articles. MB was associated with major adverse cardiac events - OR = 1.52 (1.01–2.30), and myocardial ischemia OR = 3.00 (1.02–8.82) but not with acute myocardial infarction, cardiovascular death, ischemia identified using imaging techniques, or positive exercise stress testing. Overall, myocardial bridging may have significant cardiovascular consequences (MACE, myocardial ischemia). More studies are needed to reveal/refute a clear association with MI, sudden death or other cardiovascular pathologies.
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Affiliation(s)
- Sorin Hostiuc
- Department of Legal Medicine and Bioethics, Department 2 Morphological Sciences, Faculty of Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
| | - Mugurel Constantin Rusu
- Division of Anatomy, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.,MEDCENTER, Centre of Excellence in Laboratory Medicine and Pathology, Bucharest, Romania
| | - Mihaela Hostiuc
- Department of Internal Medicine and Gastroenterology, Faculty of Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Ruxandra Irina Negoi
- Department of Anatomy, Faculty of Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Ionuț Negoi
- Department of Surgery, Faculty of Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
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15
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Nishikii-Tachibana M, Pargaonkar VS, Schnittger I, Haddad F, Rogers IS, Tremmel JA, Wang PJ. Myocardial bridging is associated with exercise-induced ventricular arrhythmia and increases in QT dispersion. Ann Noninvasive Electrocardiol 2017; 23:e12492. [PMID: 28921787 PMCID: PMC6931813 DOI: 10.1111/anec.12492] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 07/27/2017] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND A myocardial bridge (MB) has been associated with ventricular arrhythmia and sudden death during exercise. QT dispersion (QTd) is a measure of abnormal repolarization and may predict ventricular arrhythmia. We investigated the frequency of ventricular arrhythmias during exercise and the QTd at rest and after exercise, in patients with an MB compared to a normal cohort. METHODS We studied the rest and stress ECG tracings of patients with an MB suspected by focal septal buckling on exercise echocardiography (EE) (Echo-MB group, N = 510), those with an MB confirmed by another examination (MB group, N = 110), and healthy controls (Control group, N = 198). RESULTS The frequency of exercise-induced premature ventricular contractions (PVCs) was significantly higher in the Echo-MB and MB groups compared with the Control group (both p < .001). In all, 25 patients (4.9%) in the Echo-MB group, seven patients (6.4%) in the MB group and no patients in the Control group had exercise-induced non-sustained ventricular tachycardia (NSVT). There was no difference in the baseline QTd between the groups. In the Echo-MB and MB groups, QTd postexercise increased significantly when compared with baseline (both p < .001). Patients with NSVT had a higher frequency of male gender and an even greater increase in QTd with exercise compared with the non-NSVT group. DISCUSSION There is an increased frequency of exercise-induced PVCs and NSVT in patients with MBs. Exercise significantly increases QTd in MB patients, with an even greater increase in QTd in MB patients with NSVT. Exercise in MB patients results in ventricular arrhythmias and abnormalities in repolarization.
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Affiliation(s)
- Makiko Nishikii-Tachibana
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA.,Cardiovascular Division, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Vedant S Pargaonkar
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Ingela Schnittger
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Francois Haddad
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Ian S Rogers
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Jennifer A Tremmel
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Paul J Wang
- The Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
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16
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Rogers IS, Tremmel JA, Schnittger I. Myocardial bridges: Overview of diagnosis and management. CONGENIT HEART DIS 2017; 12:619-623. [PMID: 28675696 DOI: 10.1111/chd.12499] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 05/20/2017] [Indexed: 12/30/2022]
Abstract
A myocardial bridge is a segment of a coronary artery that travels into the myocardium instead of the normal epicardial course. Although it is general perception that myocardial bridges are normal variants, patients with myocardial bridges can present with symptoms, such as exertional chest pain, that cannot be explained by a secondary etiology. Such patients may benefit from individualized medical/surgical therapy. This article describes the prevalence, clinical presentation, classification, evaluation, and management of children and adults with symptomatic myocardial bridges.
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Affiliation(s)
- Ian S Rogers
- Division of Cardiovascular Medicine, Stanford University, Stanford, California, USA.,Division of Pediatric Cardiology, Stanford University, Stanford, California, USA
| | - Jennifer A Tremmel
- Division of Cardiovascular Medicine, Stanford University, Stanford, California, USA
| | - Ingela Schnittger
- Division of Cardiovascular Medicine, Stanford University, Stanford, California, USA
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17
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Yu M, Zhang Y, Li Y, Li M, Li W, Zhang J. Assessment of Myocardial Bridge by Cardiac CT: Intracoronary Transluminal Attenuation Gradient Derived from Diastolic Phase Predicts Systolic Compression. Korean J Radiol 2017; 18:655-663. [PMID: 28670160 PMCID: PMC5447641 DOI: 10.3348/kjr.2017.18.4.655] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 01/25/2017] [Indexed: 12/13/2022] Open
Abstract
Objective To study the predictive value of transluminal attenuation gradient (TAG) derived from diastolic phase of coronary computed tomography angiography (CCTA) for identifying systolic compression of myocardial bridge (MB). Materials and Methods Consecutive patients diagnosed with MB based on CCTA findings and without obstructive coronary artery disease were retrospectively enrolled. In total, 143 patients with 144 MBs were included in the study. Patients were classified into three groups: without systolic compression, with systolic compression < 50%, and with systolic compression ≥ 50%. TAG was defined as the linear regression coefficient between intraluminal attenuation in Hounsfield units (HU) and length from the vessel ostium. Other indices such as the length and depth of the MB were also recorded. Results TAG was the lowest in MB patients with systolic compression ≥ 50% (-19.9 ± 8.7 HU/10 mm). Receiver operating characteristic curve analysis was performed to determine the optimal cutoff values for identifying systolic compression ≥ 50%. The result indicated an optimal cutoff value of TAG as -18.8 HU/10 mm (area under curve = 0.778, p < 0.001), which yielded higher sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy (54.1, 80.5, 72.8, and 75.0%, respectively). In addition, the TAG of MB with diastolic compression was significantly lower than the TAG of MB without diastolic compression (-21.4 ± 4.8 HU/10 mm vs. -12.7 ± 8 HU/10 mm, p < 0.001). Conclusion TAG was a better predictor of MB with systolic compression ≥ 50%, compared to the length or depth of the MB. The TAG of MB with persistent diastolic compression was significantly lower than the TAG without diastolic compression.
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Affiliation(s)
- Mengmeng Yu
- Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Yang Zhang
- Department of Pharmaceutical Science, School of Pharmacy, The Second Military Medical University, Shanghai 200433, China.,Department of Scientific Research, TongRen Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200050, China
| | - Yuehua Li
- Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Minghua Li
- Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Wenbin Li
- Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Jiayin Zhang
- Institute of Diagnostic and Interventional Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
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18
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Singh D, Vadi SK, Parmar M, Sood A, Mehrotra S, Mittal BR. Role of 99mTc-sestamibi gated SPECT/CT myocardial perfusion imaging in the management of patients with myocardial bridging and its correlation with coronary angiography. J Cardiol Cases 2017; 15:136-140. [PMID: 30279761 DOI: 10.1016/j.jccase.2016.12.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 12/14/2016] [Accepted: 12/21/2016] [Indexed: 11/18/2022] Open
Abstract
Myocardial bridging (MB)-a congenital coronary abnormality in its severe form leads to myocardial edema, fibrosis, and ischemia due to coronary artery compression during systole and early part of the diastole. This study evaluated the hemodynamic significance of MB by detecting severity and extent of perfusion abnormality using 99mTc-sestamibi (MIBI) gated single photon emission computed tomography (SPECT)/CT myocardial perfusion imaging (MPI), its correlation with coronary angiography and role in patient's management. Five patients with complaints of atypical chest pain, exertional angina, or dyspnea underwent stress/rest 99mTc-MIBI SPECT/CT MPI. The gated stress and rest SPECT/CT images on 17 segment model using quantitative gated-SPECT (QGS) softwarewere analyzed and compared with coronary angiography. Four out of five patients showed reversible perfusion defect in the left anterior descending (LAD) territory segments involved with myocardial bridging (3 patients had already proven MB; while MB was detected in 1 patient after MPI). The fifth patient with MB in the distal LAD revealed normal myocardial perfusion. All the patients were conservatively managed either due to small reversible perfusion defects or normal study except one patient. The gated SPECT/CT MPI of five patients with MB in the present study revealed their perfusion status, information on myocardial wall thickening, contractility, and ejection fraction. <Learning objective: Myocardial bridging may be one of the underlying causes for angina or sudden death even in absence of cardiovascular risk factors. The proven or clinical suspicious myocardial bridging in patients with typical/atypical chest pain and low probability of atherosclerosis should be evaluated with gated SPECT/CTMPI. It helps in detection of coronary artery disease along with severity and extent of myocardial ischemia for their further management.>.
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Affiliation(s)
- Deepa Singh
- Department of Nuclear Medicine, PGIMER, Chandigarh, India
| | - Shelvin K Vadi
- Department of Nuclear Medicine, PGIMER, Chandigarh, India
| | - Madan Parmar
- Department of Nuclear Medicine, PGIMER, Chandigarh, India
| | - Ashwani Sood
- Department of Nuclear Medicine, PGIMER, Chandigarh, India
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19
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Seo J, Park J, Oh J, Uhm JS, Sung JH, Kim JY, Pak HN, Lee MH, Joung B. High Prevalence and Clinical Implication of Myocardial Bridging in Patients with Early Repolarization. Yonsei Med J 2017; 58:67-74. [PMID: 27873497 PMCID: PMC5122654 DOI: 10.3349/ymj.2017.58.1.67] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 05/30/2016] [Accepted: 05/30/2016] [Indexed: 01/29/2023] Open
Abstract
PURPOSE Recent evidence suggests that early repolarization (ER) is related with myocardial ischemia. Compression of coronary artery by a myocardial bridging (MB) can be associated with clinical manifestations of myocardial ischemia. This study aimed to evaluate the associations of MB in patients with ER. MATERIALS AND METHODS In consecutive patients (n=1303, age, 61±12 years) who had undergone coronary angiography, we assessed the prevalence and prognostic implication of MB in those with ER (n=142) and those without ER (n=1161). RESULTS MB was observed in 54 (38%) and 196 (17%) patients in ER and no-ER groups (p<0.001). In multivariate analysis, MB was independently associated with ER (odd ratio: 2.9, 95% confidence interval: 1.98-4.24, p<0.001). Notched type ER was more frequently observed in MB involving the mid portion of left anterior descending coronary artery (LAD) (69.8% vs. 30.2%, p=0.03). Cardiac event was observed in nine (6.3%) and 22 (1.9%) subjects with and without ER, respectively. MB was more frequently observed in sudden death patients with ER (2 out of 9, 22%) than in those without ER (0 out of 22). CONCLUSION MB was independently associated with ER in patients without out structural heart disease who underwent coronary angiography. Notched type ER was closely related with MB involving the mid portion of the LAD. Among patients who had experienced cardiac events, a higher prevalence of MB was observed in patients with ER than those without ER. Further prospective studies on the prognosis of MB in ER patients are required.
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Affiliation(s)
- Jiwon Seo
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Junbeom Park
- Department of Internal Medicine, Division of Cardiology, Ewha Womans University, Seoul, Korea
| | - Jaewon Oh
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Jae Sun Uhm
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Jung Hoon Sung
- Department of Internal Medicine, Division of Cardiology, Bundang CHA Medical Center, CHA University, Seongnam, Korea
| | - Jong Youn Kim
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Hui Nam Pak
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Moon Hyoung Lee
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea
| | - Boyoung Joung
- Department of Internal Medicine, Division of Cardiology, Yonsei University College of Medicine, Seoul, Korea.
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20
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Uusitalo V, Saraste A, Knuuti J. Multimodality Imaging in the Assessment of the Physiological Significance of Myocardial Bridging. Curr Cardiol Rep 2015; 18:2. [PMID: 26694724 DOI: 10.1007/s11886-015-0685-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
In myocardial bridging (MB) a segment of the coronary artery is covered by the myocardium. MB can be seen as a systolic compression by invasive coronary angiography (ICA) or as an intramural course by computed tomography angiography (CTA). Intramural course is a common incidental finding in CTA studies. Only minority of the bridging segments are associated with systolic compression causing a possible impairment of myocardial perfusion. The relationship between myocardial blood flow and MB is complex and poorly evaluated by anatomic imaging. Furthermore, provocation tests are frequently needed to uncover systolic compression. Fractional flow reserve can be used to assess the hemodynamic significance of MB. Nuclear perfusion imaging can demonstrate flow abnormalities associated with MB. Stress echocardiography can demonstrate ischemic wall motion abnormalities. They can be complemented by hybrid imaging with CTA to distinguish epicardial coronary artery disease and MB. This article will review different imaging modalities for the evaluation of the physiologic significance of MB.
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Affiliation(s)
- Valtteri Uusitalo
- Turku PET Centre, Turku University Hospital, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland.
| | - Antti Saraste
- Turku PET Centre, Turku University Hospital, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland.,Heart Center, Turku University Hospital, University of Turku, Turku, Finland
| | - Juhani Knuuti
- Turku PET Centre, Turku University Hospital, University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland.,Department of Clinical Physiology, Nuclear Medicine and PET, Turku University Hospital, University of Turku, Turku, Finland
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21
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The Functional Effects of Intramural Course of Coronary Arteries and its Relation to Coronary Atherosclerosis. JACC Cardiovasc Imaging 2015; 8:697-704. [DOI: 10.1016/j.jcmg.2015.04.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 03/24/2015] [Accepted: 04/02/2015] [Indexed: 12/31/2022]
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22
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Corban MT, Hung OY, Eshtehardi P, Rasoul-Arzrumly E, McDaniel M, Mekonnen G, Timmins LH, Lutz J, Guyton RA, Samady H. Myocardial bridging: contemporary understanding of pathophysiology with implications for diagnostic and therapeutic strategies. J Am Coll Cardiol 2014; 63:2346-2355. [PMID: 24583304 DOI: 10.1016/j.jacc.2014.01.049] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 01/24/2014] [Accepted: 01/28/2014] [Indexed: 12/30/2022]
Abstract
Patients with myocardial bridging are often asymptomatic, but this anomaly may be associated with exertional angina, acute coronary syndromes, cardiac arrhythmias, syncope, or even sudden cardiac death. This review presents our understanding of the pathophysiology of myocardial bridging and describes prevailing diagnostic modalities and therapeutic options for this challenging clinical entity.
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Affiliation(s)
- Michel T Corban
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Olivia Y Hung
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Parham Eshtehardi
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Emad Rasoul-Arzrumly
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Michael McDaniel
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Girum Mekonnen
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Lucas H Timmins
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA
| | - Jerre Lutz
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
| | - Robert A Guyton
- Division of Cardiothoracic Surgery, Department of Surgery, Emory University School of Medicine, Atlanta, GA
| | - Habib Samady
- Andreas Gruentzig Cardiovascular Center, Division of Cardiology, Department of Medicine, Emory University School of Medicine, Atlanta, GA
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23
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Lin S, Tremmel JA, Yamada R, Rogers IS, Yong CM, Turcott R, McConnell MV, Dash R, Schnittger I. A novel stress echocardiography pattern for myocardial bridge with invasive structural and hemodynamic correlation. J Am Heart Assoc 2013; 2:e000097. [PMID: 23591827 PMCID: PMC3647262 DOI: 10.1161/jaha.113.000097] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Background Patients with a myocardial bridge (MB) and no significant obstructive coronary artery disease (CAD) may experience angina presumably from ischemia, but noninvasive assessment has been limited and the underlying mechanism poorly understood. This study seeks to correlate a novel exercise echocardiography (EE) finding for MBs with invasive structural and hemodynamic measurements. Methods and Results Eighteen patients with angina and an EE pattern of focal end‐systolic to early‐diastolic buckling in the septum with apical sparing were prospectively enrolled for invasive assessment. This included coronary angiography, left anterior descending artery (LAD) intravascular ultrasound (IVUS), and intracoronary pressure and Doppler measurements at rest and during dobutamine stress. All patients were found to have an LAD MB on IVUS. The ratios of diastolic intracoronary pressure divided by aortic pressure at rest (Pd/Pa) and during dobutamine stress (diastolic fractional flow reserve [dFFR]) and peak Doppler flow velocity recordings at rest and with stress were successfully performed in 14 patients. All had abnormal dFFR (≤0.75) at stress within the bridge, distally or in both positions, and on average showed a more than doubling in peak Doppler flow velocity inside the MB at stress. Seventy‐five percent of patients had normalization of dFFR distal to the MB, with partial pressure recovery and a decrease in peak Doppler flow velocity. Conclusions A distinctive septal wall motion abnormality with apical sparing on EE is associated with a documented MB by IVUS and a decreased dFFR. We posit that the septal wall motion abnormality on EE is due to dynamic ischemia local to the compressed segment of the LAD from the increase in velocity and decrease in perfusion pressure, consistent with the Venturi effect.
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Affiliation(s)
- Shin Lin
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
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Cai W, Dong Y, Zhou X, Chen SB, Zhao JH, Jiang TM, Li YM. Left ventricular systolic dyssynchrony in patients with isolated symptomatic myocardial bridge. SCAND CARDIOVASC J 2012; 47:11-9. [PMID: 23036109 DOI: 10.3109/14017431.2012.736635] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES The impact of myocardial bridge (MB) on left ventricular (LV) systolic synchrony is insufficiently understood. DESIGN Thirty-five subjects with isolated mid-left, anterior, descending artery (LAD) MB, preserved LV ejection fraction (LVEF > 50%), and otherwise, normal coronary angiogram were identified from 3607 patients who underwent diagnostic coronary angiography and were evaluated by tissue Doppler imaging and real-time three-dimensional echocardiography (RT3DE). Control subjects consisted of 26 age and sex-matched coronary angiographically "normal" subjects. RESULTS MB patients were characterized by reduced, early, diastolic strain rate in LAD-supplied apical segments (lateral and anterior), with prevalence of LV systolic dyssynchrony of 25.7% (9/35). MB patients were further classified by the medians of MB stenosis and length. For MB stenosis < 52.5%, Class I: length < 17 mm (n = 7), Class II: length ≥ 17 mm (n = 10); for stenosis ≥ 52.5%, Class III: length < 17 mm (n = 10), Class IV: length ≥ 17 mm (n = 8). Binary Logistic regression model revealed that higher MB lesion classification (odds ratio: 4.944, 95%CI 1.174-20.82, P < 0.05) and hypertension (odds ratio: 15.32, 95%CI: 1.252-187.6, P < 0.05) are statistically associated with LV systolic dyssynchrony, which was independent of LV mass. CONCLUSIONS MB in the mid LAD is associated with myocardial dyssynchrony. Hypertensive individuals and those with more severe bridging (determined by length and stenosis) tend to have an increased incidence of dyssynchrony.
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Affiliation(s)
- Wei Cai
- Institute of Cardiovascular Disease and Heart Center, Pingjin Hospital, Logistics University of Chinese People's Armed Police Forces, Tianjin, PR China
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Galbraith EM, Eshtehardi P, Samady H. SPECT perfusion imaging and myocardial bridges: bridging the gap of diagnostic uncertainty. J Nucl Cardiol 2011; 18:1000-2. [PMID: 21842329 DOI: 10.1007/s12350-011-9443-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Myocardial bridging on coronary CTA: an innocent bystander or a culprit in myocardial infarction? J Cardiovasc Comput Tomogr 2011; 6:3-13. [PMID: 22264630 DOI: 10.1016/j.jcct.2011.10.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 08/24/2011] [Accepted: 10/20/2011] [Indexed: 12/28/2022]
Abstract
Myocardial bridging describes the clinical entity whereby a segment of coronary artery is either partially or completely covered by surrounding myocardium. It represents the most frequent congenital coronary anomaly and has an estimated prevalence of ≤13% on angiographic series. With the emergence of cardiac computed tomography and its ability to simultaneously image the coronary arteries and also the myocardium, there has been an apparent increase in the detection rates of myocardial bridges (prevalence as high as 44%). It has now become important to evaluate their clinical significance. Myocardial bridging is generally considered a benign entity with survival rates of 97% at 5 years; however, there is now emerging evidence that certain myocardial bridge characteristics may be associated with cardiovascular morbidity. The length and depth of myocardial bridges have been associated with increased atherosclerosis, whereas the degree of systolic compression has been associated with ischemia on myocardial perfusion single-photon emission tomography. On the basis of current evidence, it appears that limiting further testing for ischemia to symptomatic patients with long and/or deep myocardial brides would be appropriate.
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