scholarly journals Myocardial Bridges and their Relationship to the Anterior Interventricular Branch of the Left Coronary Artery

2002 ◽  
Vol 79 (3) ◽  
Author(s):  
Vanildo Júnior de Melo Lima ◽  
Jennecy Sales Cavalcanti ◽  
Tetsuo Tashiro
Keyword(s):  
Coronary Artery ◽  
Left Coronary Artery ◽  
Myocardial Bridges

scholarly journals Myocardial bridges and coronary distribution in dairy cattle from Brazil Northeast

2021 ◽  
Vol 4 (4) ◽  
pp. 31-42
Author(s):  
Vinícius Lima Brito ◽  
◽  
Kethelyn Freitas de Lima ◽  
Anielly Mirelly de Assunção Ramalho ◽  
Jadson Vieira de Melo ◽  
...  
Keyword(s):  
Veterinary Medicine ◽  
Coronary Artery ◽  
Dairy Cattle ◽  
Coronary Arteries ◽  
Left Coronary Artery ◽  
Experimental Models ◽  
Northeastern Brazil ◽  
Age Group ◽  
Myocardial Bridges ◽  
Path Lengths

This study evaluated the distribution and possible variations of the coronary arteries and the presence of myocardial bridges in dairy cattle from Northeastern Brazil. Thus, healthy hearts were analyzed according to many variables. Left coronary artery originate the rami paraconalis, circumflexus et subsinuosus. Ramus subsinuosus and right coronary artery showed a short subepicardial path. Lengths of the main branches showed statistical differences only in relation to age group and weight of the animal. Myocardial bridges had a prevalence of 55% and were more frequent over the ramus paraconalis. Veterinary medicine is able to provide experimental models to expand the necessary study to understand pathophysiology and clinical relevance of the bridges.

scholarly journals Angioarchitecture of the coronary arteries in Mazama gouazoubira (G. Fischer, 1814)

2021 ◽  
Vol 15 (4) ◽  
pp. 297-303
Author(s):  
Milena Sorban Zaniboni ◽  
Wilson Viotto-Souza ◽  
Drielly Gomes Assis Samora ◽  
Fernanda Coelho Simas Bernardes ◽  
André Luiz Quagliatto Santos ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Left Coronary Artery ◽  
South American ◽  
Myocardial Bridges ◽  
History Of ◽  
The Mean ◽  
Mazama Gouazoubira ◽  
The Right ◽  
South American Continent ◽  
Coronary Dominance

Mazama gouazoubira is a widely distributed deer in the South American continent. However, studies on its anatomical characteristics are still scarce. The objective of this study was to elucidate the coronary circulation of M. gouazoubira. With this aim, after collecting cadavers on highways, twenty-four hearts injected with latex and preserved in formaldehyde at 10% were dissected. The dissections revealed that all specimens presented left coronary dominance, characterized by the origin of the subsinuous interventricular branch from the circumflex branch of the left coronary artery. The number of ventricular branches originated from branches of the left coronary artery was approximately five times higher than that of the right coronary artery. The occurrence of myocardial bridges was registered in 91.7% of the individuals, with bridges predominating over the paraconal interventricular branch. The mean length of the paraconal interventricular sulcus was significantly higher in males (p = 0.02). The number of atrial branches and ventricular branches, length of myocardial bridges and length of subsinuous interventricular sulcus did not vary significantly between sex. Left coronary dominance and high frequency of myocardial bridges in M. gouazoubira are preponderant anatomical traits also present in different species of Ruminantia suborder. Coronary dominance studies in other South American deer species may confirm the correlation of this trait with the evolutionary history of these animals.

Regularities in the distribution of myocardial bridges over the branches of the coronary arteries

2020 ◽  
Vol 9 (3) ◽  
pp. 16-21
Author(s):  
E. G. Dmitrieva ◽  
A. A. Yakimov
Keyword(s):  
Coronary Artery ◽  
Elderly People ◽  
Blood Supply ◽  
Coronary Arteries ◽  
Human Heart ◽  
Left Coronary Artery ◽  
Heart Diseases ◽  
Macroscopic Anatomy ◽  
Myocardial Bridges ◽  
The Right

The article highlights peculiarities of localization of myocardial bridges. It is believed that the coronary arteries and their branches are located in the subepicardial tissue. However, some researchers describe cases of intramural localization of their sections. Myocardial bridges – a set of fibers of the ventricular myocardium located over a certain area of the subepicardial branch of the coronary artery - represent variants of such localization.The aim of the study was to establish the patterns of macroscopic anatomy and topography of myocardial bridges investigating anatomical sections of the human heart in the adult and elderly people. Material and methods. The study involved 65 formalin-fixed sample preparations of the human heart of the adult and elderly people who died of conditions that were not associated with heart diseases. The authors measured transverse and longitudinal dimensions of the ventricular complex of the heart, and calculated the transverse-longitudinal index. Subepicardial vessels were prepared without prior injection. The number of myocardial bridges over the main branches of the coronary arteries was counted and their length was measured. The type of blood supply to the heart was determined according to a three-member classification, depending on the source of discharge of the posterior interventricular branch. Results. Myocardial bridges were observed on 44 (67.6%) sample preparations. As a rule, they were located over the branches of the left coronary artery (91.5%). They were typically located in the proximal half of the anterior interventricular sulcus. The length of the bridges ranged from 2.5 to 64 mm (Me = 13 mm). A direct positive correlation was found between the length of the ventricular complex of the heart and the length of the bridges. The relationship between the type of blood supply to the heart and the presence of bridges was not revealed. In 26 preparations, a cone artery departed from the right coronary sinus of the aorta, in addition to the right coronary artery, and bridges were observed in 17 sample preparations. Conclusion. Myocardial bridges are more typical for the branches of the left coronary artery compared to the right. They are typically localized in the proximal third of the anterior interventricular sulcus. There is a dependence between the length of the bridges and the length of the ventricular complex of the heart. The distribution and number of myocardial bridges does not depend on the type of blood supply to the heart, but is associated with the independent discharge of the cone artery from the aorta.

Repair of Anomalous Left Coronary Artery from Pulmonary Artery (ALCAPA) beyond Infancy

2013 ◽  
Vol 16 (4) ◽  
pp. 210 ◽  
Author(s):  
Sachin Talwar ◽  
Aandrei Jivendra Jha ◽  
Shiv Kumar Choudhary ◽  
Saurabh Kumar Gupta ◽  
Balram Airan
Keyword(s):  
Coronary Artery ◽  
Pulmonary Artery ◽  
Respiratory Tract ◽  
Left Coronary Artery ◽  
Nyha Class ◽  
Left Ventricular ◽  
Left Ventricular Ejection ◽  
Anomalous Left Coronary Artery ◽  
Tract Infections ◽  
Anomalous Left Coronary

Between January 2002 and December 2012, five patients (4 female) underwent corrective surgery for anomalous left coronary artery from pulmonary artery (ALCAPA). They were older than 1 year (range, 3-56 years). One of the 2 patients younger than 10 years had presented with congestive heart failure, and the other had experienced repeated episodes of lower respiratory tract infection since childhood. Of the remaining 3 adult patients, 2 had experienced angina with effort, and 1 patient had had repeated respiratory tract infections since childhood, with mild dyspnea on effort of New York Heart Association (NYHA) class II. Three patients had the anomalous left coronary artery implanted directly into the ascending aorta via coronary-button transfer, and 2 patients underwent coronary artery bypass with obliteration of the left main ostium. Two patients underwent concomitant mitral valve repair procedures, and 1 patient underwent direct closure of a perimembranous ventricular septal defect. Four patients survived the surgery, and 1 patient died because of a persistently low cardiac output. Follow-up times ranged from 3 months to 4 years. All survivors are in NYHA class I and have left ventricular ejection fractions of 45% to 60%, with moderate (n = 1), mild (n = 1), or no (n = 2) mitral insufficiency. We conclude that a few naturally selected patients with ALCAPA do survive beyond infancy and can undergo establishment of 2 coronary systems with satisfactory results.

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