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      // ============================================================
      // PAGE 1: TITLE PAGE
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      centered('Variações das Artérias Coronárias e Sua Importância Clínica em Cardiologia', { bold: true, large: true }),
      centered('Coronary Artery Variations and Their Clinical Importance in Cardiology', { bold: true, large: true }),
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      centered('Short title: Coronary Artery Variations in Clinical Practice'),
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      centered('Altamas Khan¹, Toichieva Zarina Zhamaldinovna², Ergeshova Aida Masalbekovna²'),
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      centered('¹ Student, International Medical Faculty, Osh State University, Osh, Kyrgyz Republic'),
      centered('² Lecturer, International Medical Faculty, Osh State University, Osh, Kyrgyz Republic'),
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        { text: 'Corresponding Author: ', bold: true },
        { text: 'Altamas Khan, International Medical Faculty, Osh State University, Osh, Kyrgyz Republic.' }
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        { text: 'Toichieva Zarina Zhamaldinovna: 0000-0002-4737-1699; Ergeshova Aida Masalbekovna: 0009-0005-2068-8484' }
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      paraRuns([
        { text: 'Keywords: ', bold: true },
        { text: 'Coronary Vessel Anomalies; Myocardial Bridging; Tomography, X-Ray Computed; Death, Sudden, Cardiac; Coronary Angiography' }
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        { text: 'This research received no external funding.' }
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        { text: 'The authors declare no conflict of interest.' }
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        { text: 'Author Contributions: ', bold: true },
        { text: 'Altamas Khan: Conceptualization, literature search, writing – original draft, writing – review & editing. Toichieva Zarina Zhamaldinovna: Supervision, writing – review & editing, validation. Ergeshova Aida Masalbekovna: Supervision, writing – review & editing, validation.' }
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        { text: 'Artificial intelligence tools were used in a non-substantive capacity to assist with language refinement and editorial polishing of selected passages. All intellectual content, including identification and selection of literature, synthesis of evidence, clinical analysis, and interpretations, was developed, verified, and approved by the human authors. No AI tool was used to generate original scientific content, create references, or produce figures.' }
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      // PAGE 2: ABSTRACT
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      para('Coronary artery anatomy displayed considerable individual variation, with patterns ranging from incidental findings of no hemodynamic consequence to anomalies that predisposed to myocardial ischemia, arrhythmias, or sudden cardiac death. This narrative review synthesized published anatomical, radiological, and clinical literature to provide a structured and clinically oriented overview of coronary artery variations and their relevance to contemporary cardiovascular practice. Normal coronary anatomy, the embryological basis of developmental variation, and the full spectrum of common variants were examined, including coronary dominance patterns, separate coronary ostia, high take-off arteries, single coronary artery, myocardial bridging, anomalous origin from the opposite sinus, and branching differences. Their clinical significance was explored across invasive angiography, percutaneous coronary intervention, coronary artery bypass grafting, and their association with sudden cardiac death. Diagnostic imaging modalities, including coronary computed tomography angiography and cardiac magnetic resonance imaging, were compared for their roles in detecting and characterizing these anomalies. Management strategies ranged from conservative surveillance to surgical correction, guided by anatomical risk features and symptom burden. These findings collectively underscored the need for multi-modality imaging and individualized risk stratification to reduce adverse outcomes in patients harboring high-risk coronary variants and to optimize procedural safety across cardiology, cardiac surgery, and radiology.'),
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        { text: 'Coronary Vessel Anomalies; Myocardial Bridging; Tomography, X-Ray Computed; Death, Sudden, Cardiac; Coronary Angiography' }
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      h1('1. Introduction'),
      para('The coronary arteries are the primary conduits through which the myocardium receives its blood supply, and their uninterrupted function is essential for normal cardiac performance. The heart is supplied by the left and right coronary arteries, both arising from the ascending aorta and distributing oxygenated blood across distinct myocardial territories.1,2,3 Coronary perfusion must be precisely matched to myocardial metabolic demand, and this relationship can be assessed noninvasively using quantitative imaging techniques including positron emission tomography, cardiac magnetic resonance imaging, and computed tomography.4 Beyond the principal vessels, collateral channels serve as an important reserve mechanism, capable of sustaining partial myocardial perfusion when a primary vessel is compromised.2'),
      para('Disruption of coronary blood flow, whether due to atherosclerosis, thrombosis, or anatomical variation, may precipitate myocardial ischemia. Acute coronary syndromes arise through a combination of plaque vulnerability, endothelial dysfunction, and coronary vasospasm, emphasizing that coronary pathophysiology extends well beyond fixed luminal narrowing.5 The coronary arteries thus occupy a central position in the pathogenesis of cardiovascular disease and in its diagnosis and management.'),
      para('Coronary artery variations encompass a broad spectrum of anatomical differences involving the origin, course, branching pattern, and dominance of the coronary vessels. Their reported prevalence varies considerably depending on the diagnostic modality and population studied, ranging from under 1% in angiographic series to over 8% in studies employing coronary computed tomography angiography (CCTA).1,3,6 In a landmark angiographic study of 126,595 patients, coronary anomalies were identified in 1.3% of cases, with the majority representing anomalies of origin and distribution.7 More recent CCTA-based studies have reported prevalences of 4.84% and 8.44%, the latter including myocardial bridging in 6.83% of cases.8,9 The distinction between a normal anatomical variant and a true coronary anomaly remains a subject of ongoing discussion; some investigators propose that patterns occurring in fewer than 1% of the population should be classified as anomalies rather than variants.1,3,6'),
      para('A sound understanding of coronary artery variations is indispensable for cardiologists, radiologists, and cardiac surgeons, as these differences carry meaningful diagnostic and therapeutic implications.1,3,6 While many variants are clinically silent and discovered only incidentally, certain patterns can impair coronary blood flow and contribute to myocardial ischemia, ventricular arrhythmias, or sudden cardiac death.1,3,6 Congenital coronary anomalies are recognized as one of the leading cardiovascular causes of sudden cardiac death in young athletes, arising from ischemia induced during vigorous exertion.8 Furthermore, unrecognized variant anatomy may increase procedural complexity and the risk of adverse outcomes during angiography and cardiac surgery.13,14'),

      h1('2. Search Strategy and Selection Criteria'),
      para('The authors followed the Scale for the Quality Assessment of Narrative Review Articles (SANRA) guidelines. A comprehensive literature search was performed in PubMed, Google Scholar, and Scopus using keywords including "coronary artery variations," "coronary artery anomalies," "myocardial bridging," "ACAOS," and "coronary computed tomography angiography." A total of approximately 90 articles were initially identified and screened for relevance, of which 60 references were selected for inclusion based on their relevance to clinically significant variations and impact on cardiovascular management. Inclusion criteria were peer-reviewed anatomical studies, clinical reviews, and case series published between 1990 and 2026.'),

      h1('3. Normal Coronary Artery Anatomy'),
      para('Normal coronary artery anatomy is defined by two coronary ostia centrally located within the right and left sinuses of Valsalva.15 The left main coronary artery originates from the left ostium and divides into the left anterior descending (LAD) and left circumflex (LCX) arteries, while the right coronary artery (RCA) arises from the right ostium and courses in the right atrioventricular groove.15,16 The three main coronary arteries branch to supply both the atria and ventricles, terminating in fine arborizations that penetrate the myocardium. Myocardial perfusion of the left ventricle occurs predominantly during diastole due to systolic compression, whereas the right ventricular myocardium is perfused throughout both phases of the cardiac cycle.15'),
      para('(Figure 1)'),

      h2('3.1 Right Coronary Artery (RCA)'),
      para('The RCA originates from the right coronary sinus and travels in the right atrioventricular groove, supplying the right atrium, right ventricle, portions of the interventricular septum, and the cardiac conduction system through the sinoatrial and atrioventricular nodal arteries.16,17 The sinoatrial nodal artery arises from the RCA in approximately 55–70% of individuals, with the remainder originating from the LCX.16 Important RCA branches include the conus artery, right marginal artery, and posterior interventricular artery. Morphometric analyses show that the proximal RCA caliber averages 3.42 ± 0.66 mm, and in approximately 75.6% of specimens it terminates between the crux cordis and left cardiac margin.16'),

      h2('3.2 Left Main Coronary Artery (LMCA)'),
      para('The LMCA arises from the left aortic sinus and serves as the common trunk of the left coronary circulation, typically measuring 10–20 mm in length before bifurcating into the LAD and LCX arteries.17,18,19,20 In approximately 15–30% of individuals, the LMCA trifurcates to give rise to a ramus intermedius branch that supplies the anterolateral left ventricular wall.20,21 Intravascular ultrasound studies have demonstrated that quantitative coronary angiography consistently underestimates true vessel dimensions, with implications for stent sizing in left main interventions.19'),

      h2('3.3 Left Anterior Descending Artery (LAD)'),
      para('The LAD, or anterior interventricular artery, courses in the anterior interventricular sulcus toward the cardiac apex, supplying the anterior left ventricular wall and approximately the anterior two-thirds of the interventricular septum.17,16 Its principal branches are septal perforators, supplying the interventricular septum, and diagonal branches, supplying the anterolateral left ventricular wall.16,20 Occlusion of the LAD carries significant prognostic weight given the large myocardial territory it supplies.'),

      h2('3.4 Left Circumflex Artery (LCX)'),
      para('The LCX originates from the LMCA and travels in the left atrioventricular groove, supplying the lateral and posterior left ventricular wall and the left atrium.16,17 Its main branches are the obtuse marginal arteries, which supply the lateral left ventricular wall. Occlusion of the obtuse marginal artery may produce myocardial ischemia with subtle or atypical electrocardiographic changes, making clinical recognition challenging.22 The myocardial territory supplied by the LCX varies according to coronary dominance.16,17'),

      h1('4. Embryological Basis of Coronary Artery Variations'),
      h2('4.1 Development of Coronary Arteries'),
      para('Coronary artery development is a coordinated embryological process requiring interactions between the epicardium, myocardium, and developing vasculature.23,24,25,26 The embryonic heart initially relies on diffusion from the cardiac chambers for nutrient delivery. As the myocardium grows and compacts, a dedicated coronary vascular system becomes essential. This process begins with formation of the epicardium from the proepicardium, which envelops the cardiac surface and provides cellular precursors for vascular development.23,24,25,26 A primitive subepicardial vascular plexus forms over the cardiac surface, with endothelial progenitors arising predominantly from the sinus venosus.16 Coronary arteriogenesis depends on epicardial-myocardial signaling mediated by secreted growth factors that coordinate vascular growth with myocardial expansion.27 The coronary ostia form when peritruncal vascular channels penetrate the aortic sinuses of Valsalva, establishing the mature right and left coronary arteries.23,24,25,26'),

      h2('4.2 Basis of Anatomical Variations'),
      para('Coronary artery variations are congenital in origin, arising from disturbances at various stages of embryological development.3,23,25,26 Because coronary formation involves sequential steps of vasculogenesis, angiogenesis, plexus remodeling, and aortic connection, any disruption can alter the final anatomy.3,23,25,26 Persistence of normally regressing embryonic channels or regression of normally persistent ones can create unusual coronary arrangements, resulting in anomalous coronary origins, separate coronary ostia, or single coronary artery configurations.3,23,25,26 Although most such variations remain clinically benign, certain developmental abnormalities may impair perfusion and predispose to ischemia, arrhythmias, or sudden death.3,23,25,26'),

      h1('5. Common Coronary Artery Variations'),
      para('(Figure 2)'),

      h2('5.1 Coronary Dominance Patterns'),
      para('Coronary dominance is defined by the artery from which the posterior descending artery (PDA) originates. In right-dominant circulation the PDA arises from the RCA, in left-dominant from the LCX, and in co-dominant patterns both vessels contribute.10 Right dominance is observed in approximately 85% of individuals, left dominance in approximately 8%, and co-dominance in approximately 7%.10 These patterns are generally regarded as normal anatomical variants, but they carry clinical relevance because the dominance pattern determines the extent of myocardial territory at risk during vessel occlusion and influences outcomes in coronary artery disease.10 In right-dominant hearts, the sinoatrial nodal artery originates from the RCA in approximately 54.7% of cases.16'),

      h2('5.2 Separate Coronary Ostia'),
      para('Separate coronary ostia describe the independent origin of the LAD and LCX arteries directly from the left aortic sinus, in the absence of a common LMCA.12,29 This variation is present in approximately 0.41% of patients and represented the most common anomaly in one large angiographic series, accounting for 63.4% of all anomalies identified.9,20 Although usually asymptomatic, the absence of a left main trunk complicates selective catheterization and requires modification of both angiographic and surgical strategies.12,29 Association with systemic conditions has been reported; in one case, this variant occurred alongside Holt-Oram syndrome with conduction disturbances requiring permanent pacemaker implantation.30'),

      h2('5.3 High Take-Off Coronary Arteries'),
      para('High take-off coronary arteries arise more than 1 cm above the sinotubular junction of the ascending aorta.31 The condition is uncommon, with a reported prevalence of approximately 0.2%, and the RCA is more frequently affected than the left coronary system.31,32,33 The majority of cases are detected incidentally. However, very high coronary origins may significantly complicate catheter engagement during angiography and cardiac surgery, and rare associations with myocardial ischemia or sudden cardiac death have been described.31,32 This variation may coexist with other anomalies such as single coronary artery, further increasing procedural complexity.33'),

      h2('5.4 Single Coronary Artery'),
      para('Single coronary artery (SCA) is a rare congenital condition in which the entire cardiac circulation arises from one coronary ostium, with a reported angiographic prevalence of 0.024–0.066%.33,34,35 The Lipton classification divides SCA into three groups: Group I, in which the vessel follows a normal coronary course and continues to supply the contralateral territory; Group II, in which a common ostium gives rise to both right and left coronary systems; and Group III, in which the LAD and LCX arise separately from a single trunk.35 Clinical consequences range from complete absence of symptoms to myocardial ischemia, syncope, and sudden cardiac death, depending on the anatomical course of the anomalous vessel.34,35 Rare variants such as an absent RCA with continuation of a dominant LCX have also been documented.36 CCTA has substantially improved the anatomical characterization and risk stratification of this anomaly.34'),

      h2('5.5 Myocardial Bridging'),
      para('Myocardial bridging (MB) occurs when a segment of an epicardial coronary artery courses within the myocardium rather than remaining on the cardiac surface. The condition was first described by Reyman in 1737.39 The LAD, particularly its middle segment, is involved in approximately 86.2% of cases.38 Prevalence varies widely by detection method, ranging from 0.15–25% in angiographic studies to up to 86% at autopsy, reflecting diagnostic heterogeneity rather than true biological variation.7,38,39 The average length of the tunneled segment is approximately 2.03 cm.38 Although MB is commonly considered benign, hemodynamically significant bridges may produce systolic compression of the tunneled segment, impairing diastolic filling and causing angina, ischemia, arrhythmias, or acute coronary syndromes.37,39,40 Atherosclerosis tends to accumulate proximal to the bridge due to altered wall shear stress, while the tunneled segment itself is relatively protected.38 MB has been identified in cases of sudden cardiac death, particularly in association with left ventricular hypertrophy.38 Advances in CCTA and intravascular imaging have improved functional characterization of clinically significant bridges.37,40'),

      h2('5.6 Anomalous Origin from the Opposite Sinus (ACAOS)'),
      para('ACAOS refers to the origin of a coronary artery from the contralateral aortic sinus. The most common forms are the RCA arising from the left sinus (prevalence 0.92%) and the left coronary artery arising from the right sinus (0.15%).42 A cardiac MRI screening study in 5,169 healthy children reported an overall ACAOS prevalence of 0.44%.43 Clinical significance depends on the anatomical course of the anomalous vessel. The interarterial course, in which the vessel passes between the aorta and pulmonary artery, carries the greatest risk of ischemia and sudden cardiac death.43 Additional high-risk features include a slit-like ostium, acute take-off angle, proximal hypoplasia, and elongated intramural segment.43'),
      para('Historical autopsy data have reported mortality rates of up to 57% for anomalous left coronary artery from the right sinus and 25% for anomalous RCA from the left sinus.42 Clinical presentation ranges from incidental discovery to myocardial infarction and sudden death during exercise.28,41 Comprehensive anatomical assessment using CCTA is essential for risk stratification and treatment planning.28,41,43'),

      h2('5.7 Branching Pattern Variations'),
      para('Branching pattern variations most commonly involve the LMCA, which bifurcates into the LAD and LCX in most individuals but trifurcates in 15–30%, giving rise to a ramus intermedius branch that supplies the anterolateral left ventricular wall.6,17,20,44 Some data suggest its presence increases atherosclerotic risk in the proximal LAD and LMCA by generating low endothelial shear stress at the trifurcation, while other reports propose a protective role as an accessory collateral source in multivessel disease.21 Other branching variants include dual LAD anatomy and differences in RCA and LCX branching.6,17,44'),

      h2('5.8 Coronary Artery Fistulae'),
      para('Coronary artery fistulae are abnormal communications between a coronary artery and a cardiac chamber, great vessel, or other vascular structure. They are detected in approximately 0.002% of the general population but are more common among patients with congenital heart disease.6,7 The right coronary artery is most frequently involved, and fistulae most commonly drain into the right heart chambers or pulmonary artery, creating a left-to-right shunt.7 Small fistulae are usually asymptomatic, but large or high-flow fistulae may cause coronary steal, myocardial ischemia, heart failure, arrhythmias, or infective endocarditis.6,7 Closure, either by transcatheter embolization or surgical ligation, is recommended when fistulae are symptomatic or produce significant hemodynamic effects.6,7'),

      h1('6. Clinical Importance of Coronary Artery Variations'),
      h2('6.1 Importance During Coronary Angiography'),
      para('Coronary artery variations significantly influence the conduct of invasive angiography. Anomalous origins and unusual coronary courses often complicate selective catheter engagement, requiring additional catheter changes, longer procedure times, and greater contrast and radiation exposure.12,13 A detailed understanding of common anomalies assists operators in selecting appropriate catheter shapes and engagement techniques for anomalous aortic origin of coronary arteries.45 Failure to identify an anomalous vessel can result in misdiagnosis, including the erroneous assumption that a vessel is occluded when it simply arises from an unexpected location.12,13 In the setting of acute coronary syndromes, such recognition failures may delay life-saving intervention.45'),

      h2('6.2 Importance During PCI and Stenting'),
      para('Percutaneous coronary intervention in patients with coronary artery variations presents unique challenges. Anomalous vessel origins complicate guide catheter engagement, and unusual coronary courses may restrict wire and device maneuverability.13,41 Intravascular ultrasound is considered the reference standard for assessing the anatomy of anomalous aortic origin of coronary arteries with interarterial course, and invasive physiological tools may provide additional functional information, though definitive threshold values remain to be established.45 Revascularization of left main and distal bifurcation lesions is associated with higher rates of ischemic complications and technical demands.46 Preprocedural CCTA-based anatomical assessment is therefore recommended whenever feasible.13,41'),

      h2('6.3 Importance During CABG Surgery'),
      para('Coronary artery bypass grafting demands precise knowledge of coronary anatomy. Graft selection, bypass target identification, and surgical planning are all directly influenced by the anatomical distribution and variation of coronary vessels.12,47 Absent LMCA or separate coronary ostia, for example, require modification of standard anastomotic strategy.12,47 Contemporary data indicate an operative mortality of approximately 1–3% for isolated CABG, with complication rates that have progressively declined through improvements in surgical technique, cardioprotection, and perioperative care.48 Accurate preoperative anatomical assessment contributes to minimizing these risks.11'),

      h2('6.4 Association with Myocardial Ischemia and Sudden Cardiac Death'),
      para('While many coronary artery variations are benign, a subset carries significant cardiovascular risk.10,13,37,41 ACAOS with an interarterial course is among the most feared anomalies, linked to myocardial ischemia, ventricular arrhythmias, and sudden cardiac death, particularly in young athletes during exertion.28,41 A 2024 JACC State-of-the-Art Review confirmed that primary cardiomyopathies, ion channelopathies, and coronary artery anomalies represent the prevalent causes of sudden cardiac death in young individuals, with coronary anomalies implicated in a substantial proportion of exercise-related fatalities.49 Hemodynamically significant myocardial bridging can cause ischemia through systolic compression of the tunneled segment and has been associated with sudden cardiac death, particularly when combined with left ventricular hypertrophy.37,38,39 Recognition of high-risk anatomical features is important for appropriate risk stratification and timely clinical intervention.10,13,28,37,41'),

      h1('7. Diagnostic Imaging of Coronary Artery Variations'),
      para('(Figure 3)'),

      h2('7.1 Coronary Angiography'),
      para('Conventional coronary angiography has long served as the primary tool for evaluating coronary artery anatomy, providing real-time luminal visualization and enabling simultaneous diagnostic and interventional procedures.50,51 Coronary variations are frequently detected incidentally during angiographic evaluation for coronary artery disease. However, invasive angiography is inherently two-dimensional and has limited ability to define the three-dimensional course of anomalous vessels relative to adjacent cardiovascular structures.50,51 Anomalous origins may also complicate catheter engagement and require specialized techniques.45,50,51 Notably, visual angiographic assessment has limited accuracy for detecting functionally significant myocardial perfusion deficits, as a substantial proportion of territories with impaired perfusion may appear angiographically normal.52'),

      h2('7.2 Coronary Computed Tomography Angiography (CCTA)'),
      para('CCTA has established itself as the preferred non-invasive imaging modality for the evaluation of coronary artery variations, offering high-resolution three-dimensional visualization of coronary origins, courses, branching patterns, and spatial relationships with adjacent structures.50,51,53 Compared with invasive angiography, CCTA provides superior anatomical characterization and higher anomaly detection rates.50,51,53 It is particularly valuable for defining high-risk features of ACAOS such as interarterial course, slit-like ostium, and intramural segment, and for characterizing myocardial bridging, high take-off origins, and single coronary artery anatomy.7,8,50,51,53'),
      para('Modern multidetector CT systems provide sufficient spatial and temporal resolution to visualize even distal coronary segments, and advanced post-processing techniques enable three-dimensional reconstruction that directly supports procedural planning and surgical decision-making.20,45,50,51,53 CCTA is now integrated into preoperative assessment for anomalous coronary artery correction and serves as a guide for catheter selection in interventional procedures.45'),

      h2('7.3 Cardiac Magnetic Resonance Imaging (CMR)'),
      para('CMR serves as a complementary modality that uniquely combines anatomical and functional assessment without radiation exposure.50,54,55 It provides comprehensive evaluation of myocardial perfusion, ventricular function, tissue characterization, and viability, enabling identification of ischemia, scar, and perfusion abnormalities that may not be apparent on purely anatomical imaging.50,54,55 CMR is widely regarded as the reference standard for cardiac function assessment due to its superior tissue characterization and precise ventricular geometry evaluation.54 Rest and stress perfusion imaging can accurately detect significant ischemia, while late gadolinium enhancement sequences allow assessment of myocardial infarction and tissue viability.55 Multimodality approaches combining CCTA and CMR are increasingly favored for comprehensive evaluation of patients with coronary artery anomalies.50'),

      h1('8. Management of Coronary Artery Variations'),
      para('(Figure 4)'),

      h2('8.1 Conservative Management'),
      para('Management of coronary artery variations must be individualized, taking into account the specific anomaly, symptom burden, anatomical risk features, and patient profile. Approximately 81% of coronary anomalies are classified as benign and do not require intervention.7 For asymptomatic patients with low-risk anatomical variants, regular clinical follow-up is appropriate. Patients with symptomatic myocardial bridging are initially treated with pharmacological therapy, including beta-blockers or non-dihydropyridine calcium-channel blockers, which reduce heart rate and myocardial oxygen demand, thereby alleviating the hemodynamic consequences of systolic compression.40'),
      para('For ACAOS without high-risk features, conservative management with exercise restriction and clinical surveillance may be appropriate, particularly in older patients who appear to carry lower event risk than young athletes.56 Single coronary artery variants are managed through a multidisciplinary approach involving congenital heart disease specialists, cardiologists, and cardiac surgeons.35 The absence of robust prospective data means that most treatment decisions remain informed by observational studies and expert consensus, underscoring the importance of individualized clinical judgment.40,56'),

      h2('8.2 Surgical Management'),
      para('Surgical intervention is reserved for symptomatic patients, those with objective evidence of myocardial ischemia, or individuals with high-risk anatomical features that substantially increase the likelihood of adverse cardiac events.11,42,56,57 For ACAOS with interarterial or intramural course, surgical options include unroofing of the intramural segment, coronary reimplantation, coronary artery bypass grafting, and coronary ostioplasty, selected according to the specific anatomy and institutional expertise.42,57'),
      para('For symptomatic myocardial bridging refractory to medical therapy, surgical options include supra-arterial myotomy and coronary artery bypass grafting. A published surgical series demonstrated that myotomy can be performed safely, with no cardiac-related deaths during follow-up and complete symptom relief in 63% of patients.58 In patients with MB coexisting with other cardiac conditions or deep, extensive bridges, bypass grafting may be the preferred approach.59 For anomalous RCA arising from the pulmonary artery (ARCAPA), reimplantation to the ascending aorta is the standard treatment and has yielded excellent long-term outcomes extending up to 25 years post-repair.60 Continued advances in imaging, risk stratification, and surgical technique are progressively improving patient selection and operative outcomes.11,43'),

      h1('9. Limitations'),
      para('This review has several limitations inherent to the narrative methodology. Unlike systematic reviews or meta-analyses, narrative reviews do not employ pre-registered search protocols or formal risk-of-bias assessments, which introduces the possibility of selection bias in literature inclusion. The prevalence estimates cited across sections derive from studies using heterogeneous diagnostic modalities, patient populations, and definitions of what constitutes a coronary anomaly versus a normal variant, limiting direct comparability. Much of the evidence base for management, particularly for rare anomalies such as single coronary artery and ACAOS, consists of case series and retrospective observational studies rather than prospective randomized trials. Readers should interpret management recommendations accordingly, recognizing that individualized clinical judgment and institutional expertise remain essential components of decision-making for these patients.'),

      h1('10. Conclusion'),
      para('Coronary artery variations represent a clinically important group of anatomical patterns with a broad spectrum of consequences, from incidental findings of no significance to life-threatening conditions requiring surgical correction. This review has examined the range of coronary artery variations – from normal anatomy and embryological origins through diagnostic evaluation and management – with the aim of supporting clinicians across cardiology, cardiac surgery, and radiology in recognizing and managing these conditions effectively.'),
      para('The prevalence of coronary variations is substantially higher when assessed by CCTA compared with invasive angiography, with myocardial bridging representing the most commonly detected anomaly. High-risk patterns, particularly ACAOS with interarterial course and hemodynamically significant myocardial bridging, demand careful evaluation in view of their association with myocardial ischemia and sudden cardiac death in young individuals.'),
      para('CCTA has transformed the non-invasive evaluation of coronary anatomy, providing three-dimensional characterization that guides procedural planning and risk stratification. CMR complements anatomical assessment with functional information on myocardial perfusion and viability. Management requires an individualized approach that weighs anatomical risk features, symptom burden, and patient characteristics.'),
      para('Future research priorities include the development of standardized classification systems, long-term prospective registries to clarify the natural history of specific variations, and refined risk stratification tools to identify patients most likely to benefit from early intervention. Integration of advanced imaging with functional assessment will continue to improve our understanding of coronary artery variations and their impact on patient outcomes.'),

      // ============================================================
      // ACKNOWLEDGEMENTS
      // ============================================================
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      para('The authors thank the faculty of the International Medical Faculty, Osh State University, for their guidance and support during the preparation of this manuscript.'),

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      para('Coronary artery anatomy displays considerable individual variation, with patterns ranging from incidental findings of no hemodynamic consequence to anomalies that predispose to myocardial ischemia, arrhythmias, or sudden cardiac death. This narrative review synthesized published anatomical, radiological, and clinical literature to provide a structured and clinically oriented overview of coronary artery variations and their relevance to contemporary cardiovascular practice. Normal coronary anatomy, the embryological basis of developmental variation, and the full spectrum of common variants were examined, including coronary dominance patterns, separate coronary ostia, high take-off arteries, single coronary artery, myocardial bridging, anomalous coronary origin from the opposite sinus, and branching differences. Their clinical significance was explored across invasive angiography, percutaneous coronary intervention, coronary artery bypass grafting, and their association with sudden cardiac death. Diagnostic imaging modalities, including coronary computed tomography angiography and cardiac magnetic resonance imaging, were compared for their respective roles in detecting and characterizing these anomalies. Management strategies ranged from conservative surveillance to surgical correction, guided by anatomical risk features and symptom burden. Multi-modality imaging and individualized risk stratification are essential to reduce adverse outcomes in patients harboring high-risk coronary variants.'),
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      h1('Introduction'),
      para('The coronary arteries supply the myocardium with oxygenated blood and are central to normal cardiac function. Both the left and right coronary arteries arise from the ascending aorta, distributing blood across distinct myocardial territories.[1,2,3] Coronary perfusion must be matched to myocardial metabolic demand, and disruption of flow – whether due to atherosclerosis, thrombosis, or anatomical variation – may precipitate ischemia.[4,5] Coronary artery variations encompass anatomical differences in origin, course, branching, and dominance. Their reported prevalence ranges from under 1% in angiographic series to over 8% in computed tomography angiography (CCTA)-based studies.[1,3,6] A landmark study of 126,595 patients identified coronary anomalies in 1.3% of cases.[7] More recent CCTA studies report prevalences of 4.84–8.44%, the latter including myocardial bridging in 6.83%.[8,9] Recognition of these variations is indispensable for cardiologists, radiologists, and cardiac surgeons, as unrecognized variant anatomy may increase procedural complexity or contribute to myocardial ischemia and sudden cardiac death.[1,3,6,13,14]', { superscripts: true }),

      h1('Methods'),
      para('The authors followed the Scale for the Quality Assessment of Narrative Review Articles (SANRA) guidelines. A comprehensive literature search was performed in PubMed, Google Scholar, and Scopus using keywords including "coronary artery variations," "coronary artery anomalies," "myocardial bridging," "ACAOS," and "coronary computed tomography angiography." Approximately 90 articles were identified and screened for relevance, of which 60 were selected based on clinical significance and impact on cardiovascular management. Inclusion criteria comprised peer-reviewed anatomical studies, clinical reviews, and case series published between 1990 and 2026.'),

      h1('Normal Coronary Artery Anatomy'),
      para('Normal coronary anatomy is defined by two ostia within the right and left sinuses of Valsalva. The left main coronary artery (LMCA) divides into the left anterior descending (LAD) and left circumflex (LCX) arteries; the right coronary artery (RCA) courses in the right atrioventricular groove.[15,16] The RCA supplies the right atrium, right ventricle, and conduction system. The sinoatrial nodal artery arises from the RCA in approximately 55–70% of individuals.[16,17] The LMCA measures 10–20 mm before bifurcating, and trifurcates in 15–30% of individuals to give rise to a ramus intermedius.[17,20,21] The LAD supplies the anterior left ventricular wall and anterior two-thirds of the interventricular septum, while the LCX supplies the lateral and posterior left ventricular wall.[16,17]', { superscripts: true }),
      para('(Figure 1)'),

      h1('Embryological Basis of Coronary Artery Variations'),
      para('Coronary artery development requires coordinated interactions between the epicardium, myocardium, and developing vasculature.[23,24,25,26] A primitive subepicardial vascular plexus forms over the cardiac surface, with coronary ostia establishing when peritruncal vascular channels penetrate the aortic sinuses of Valsalva.[23,26] Variations are congenital in origin, arising from disturbances in vasculogenesis, angiogenesis, plexus remodeling, or aortic connection. Persistence of normally regressing embryonic channels or failure of normal connections can produce anomalous origins, separate ostia, or single coronary artery configurations.[3,23,25,26]', { superscripts: true }),

      h1('Common Coronary Artery Variations'),
      para('(Figure 2)'),

      h2('Coronary Dominance'),
      para('Coronary dominance is defined by the origin of the posterior descending artery (PDA). Right dominance is observed in approximately 85% of individuals, left dominance in 8%, and co-dominance in 7%.[10] Dominance determines the myocardial territory at risk during vessel occlusion and influences outcomes in coronary artery disease.[10]', { superscripts: true }),

      h2('Separate Coronary Ostia'),
      para('Separate ostia of the LAD and LCX from the left aortic sinus, in the absence of a common LMCA, occurs in approximately 0.41% of patients and was the most common anomaly in one large angiographic series, accounting for 63.4% of all anomalies.[9,12,29] Although usually asymptomatic, this variant complicates selective catheterization and requires modification of surgical strategies.[12,29]', { superscripts: true }),

      h2('High Take-Off Coronary Arteries'),
      para('High take-off arteries arise more than 1 cm above the sinotubular junction, with a prevalence of approximately 0.2%.[31] The RCA is more frequently affected. Most cases are detected incidentally, though complications during angiography and rare associations with ischemia or sudden cardiac death have been described.[31,32]', { superscripts: true }),

      h2('Single Coronary Artery'),
      para('Single coronary artery (SCA) is a rare condition in which the entire cardiac circulation arises from one ostium, with a prevalence of 0.024–0.066%.[33,34,35] The Lipton classification divides SCA into three groups based on the course of the anomalous vessel. Clinical consequences range from asymptomatic to myocardial ischemia, syncope, and sudden cardiac death.[34,35]', { superscripts: true }),

      h2('Myocardial Bridging'),
      para('Myocardial bridging (MB) occurs when an epicardial coronary artery courses within the myocardium. The LAD middle segment is involved in approximately 86.2% of cases.[38] Prevalence ranges from 0.15–25% angiographically to up to 86% at autopsy.[7,38,39] Hemodynamically significant bridges produce systolic compression, impairing diastolic filling and causing angina, ischemia, or arrhythmias.[37,39,40] MB has been identified in cases of sudden cardiac death, particularly with left ventricular hypertrophy.[38]', { superscripts: true }),

      h2('Anomalous Origin from the Opposite Sinus (ACAOS)'),
      para('ACAOS refers to coronary origin from the contralateral aortic sinus. The most common forms are the RCA from the left sinus (0.92%) and the left coronary artery from the right sinus (0.15%).[42] The interarterial course – between the aorta and pulmonary artery – carries the greatest risk of ischemia and sudden cardiac death.[43] High-risk features include a slit-like ostium, acute take-off angle, and elongated intramural segment. Historical autopsy data report mortality rates of up to 57% for anomalous left coronary artery from the right sinus.[28,41,42,43]', { superscripts: true }),

      h2('Branching Variations and Coronary Fistulae'),
      para('LMCA trifurcation, giving rise to a ramus intermedius, occurs in 15–30% of individuals.[6,17,44] Coronary artery fistulae – abnormal communications between a coronary artery and a cardiac chamber or great vessel – are detected in approximately 0.002% of the general population but are more common in congenital heart disease.[6,7] Large or high-flow fistulae may cause coronary steal, ischemia, or heart failure, and transcatheter or surgical closure is recommended for symptomatic cases.[6,7]', { superscripts: true }),

      h1('Clinical Importance'),

      h2('Coronary Angiography and PCI'),
      para('Anomalous origins complicate selective catheter engagement during angiography, requiring additional catheter changes, longer procedure times, and greater contrast exposure.[12,13,45] Failure to identify an anomalous vessel can cause misdiagnosis and delay intervention in acute coronary syndromes.[45] During percutaneous coronary intervention (PCI), unusual coronary courses restrict guide catheter engagement and device maneuverability.[13,41] Preprocedural CCTA-based anatomical assessment is recommended whenever feasible.[13,41]', { superscripts: true }),

      h2('CABG Surgery'),
      para('Coronary artery bypass grafting demands precise knowledge of coronary anatomy for graft selection and bypass target identification.[12,47] Absent LMCA or separate ostia require modification of standard anastomotic strategy.[12,47] Contemporary data indicate operative mortality of approximately 1–3% for isolated CABG, with accurate preoperative anatomical assessment contributing to minimizing these risks.[11,48]', { superscripts: true }),

      h2('Sudden Cardiac Death'),
      para('ACAOS with interarterial course is among the most feared anomalies, linked to myocardial ischemia, ventricular arrhythmias, and sudden cardiac death in young athletes.[28,41] A 2024 JACC State-of-the-Art Review confirmed that coronary anomalies represent a prevalent cause of sudden cardiac death in young individuals.[49] Hemodynamically significant myocardial bridging, particularly when combined with left ventricular hypertrophy, is also implicated in sudden cardiac death.[37,38,39]', { superscripts: true }),

      h1('Diagnostic Imaging'),
      para('(Figure 3)'),
      para('Conventional coronary angiography provides real-time luminal visualization but is inherently two-dimensional and has limited ability to define the three-dimensional course of anomalous vessels.[50,51] Visual angiographic assessment has limited accuracy for detecting functionally significant myocardial perfusion deficits.[52]', { superscripts: true }),
      para('CCTA has established itself as the preferred non-invasive imaging modality, offering high-resolution three-dimensional visualization of coronary origins, courses, and spatial relationships with adjacent structures.[50,51,53] It is particularly valuable for defining high-risk features of ACAOS, characterizing myocardial bridging, and guiding catheter selection and surgical planning.[7,8,45,50,51,53]', { superscripts: true }),
      para('Cardiac magnetic resonance imaging (CMR) uniquely combines anatomical and functional assessment without radiation exposure, providing comprehensive evaluation of myocardial perfusion, ventricular function, and tissue viability.[50,54,55] Multimodality approaches combining CCTA and CMR are increasingly favored for patients with coronary artery anomalies.[50]', { superscripts: true }),

      h1('Management'),
      para('(Figure 4)'),
      para('Approximately 81% of coronary anomalies are classified as benign and do not require intervention.[7] Management must be individualized according to the specific anomaly, symptom burden, and anatomical risk features. Patients with symptomatic myocardial bridging are initially treated with beta-blockers or non-dihydropyridine calcium-channel blockers.[40] For ACAOS without high-risk features, conservative management with exercise restriction and clinical surveillance may be appropriate.[56]', { superscripts: true }),
      para('Surgical intervention is reserved for symptomatic patients or those with objective evidence of myocardial ischemia or high-risk anatomical features.[11,42,56,57] Surgical options for ACAOS include unroofing of the intramural segment, coronary reimplantation, CABG, and coronary ostioplasty.[42,57] For refractory myocardial bridging, supra-arterial myotomy or CABG is performed; one surgical series demonstrated complete symptom relief in 63% of patients following myotomy.[58,59] For anomalous RCA arising from the pulmonary artery, reimplantation to the ascending aorta is standard, with excellent long-term outcomes extending up to 25 years post-repair.[60]', { superscripts: true }),

      h1('Limitations'),
      para('This narrative review does not employ a pre-registered search protocol or formal risk-of-bias assessment, introducing potential selection bias. Prevalence estimates derive from studies using heterogeneous diagnostic modalities and definitions, limiting direct comparability. Much of the evidence base for management consists of case series and retrospective observational studies rather than randomized controlled trials. Individualized clinical judgment and institutional expertise remain essential in decision-making for these patients.'),

      h1('Conclusion'),
      para('Coronary artery variations range from incidental anatomical findings to life-threatening conditions requiring surgical correction. CCTA has transformed their non-invasive evaluation, providing three-dimensional characterization that guides procedural planning and risk stratification. CMR complements anatomical assessment with functional information. Management requires an individualized approach weighing anatomical risk features, symptom burden, and patient characteristics. Future priorities include standardized classification systems, prospective registries, and refined risk stratification tools to identify patients most likely to benefit from early intervention.'),

      // ============================================================
      // REFERENCES
      // ============================================================
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      h1('References'),

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      // ============================================================
      // FIGURE LEGENDS
      // ============================================================
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      paraRuns([{ text: 'Figure 2. ', bold: true }, { text: 'Classification of common coronary artery variations by anatomical category: anomalies of origin, course, and branching pattern. Created by the authors. ACAOS = anomalous coronary artery from the opposite sinus; LAD = left anterior descending artery; LMCA = left main coronary artery.' }]),
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      paraRuns([{ text: 'Figure 3. ', bold: true }, { text: 'Stepwise diagnostic imaging algorithm for suspected coronary artery variations, showing roles of CCTA and CMR. Created by the authors. CCTA = coronary computed tomography angiography; CMR = cardiac magnetic resonance imaging.' }]),
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      paraRuns([{ text: 'Figure 4. ', bold: true }, { text: 'Management algorithm for coronary artery variations based on risk stratification. Created by the authors. ACAOS = anomalous coronary artery from the opposite sinus; CABG = coronary artery bypass grafting; MB = myocardial bridging.' }]),

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