Relation of myocardial bridges and loops on the coronary arteries to coronary occlusions

Polacek, P

doi:10.1016/0002-8703(61)90515-4

Cited by 226 publications

(135 citation statements)

References 4 publications

Supporting

Mentioning

111

Contrasting

Unclassified

Order By: Relevance

“…Laboratory Animals (1998) 32,200-205 Coronary artery distribution in Macaca fascicularis an experimental primate of suitable size, modest needs and available. Our data will be compared with similar investigations on human coronary arteries (Banchi 1904, Mouchet 1933, Schlesinger 1938, James 1961, Polacek 1961, Me Alpin 1975, Soto et al 1976, Ochsner &. Mills 1978, Lambie 1980, Hadziselimovie 1981, DiDio &.…”

mentioning

confidence: 86%

Coronary artery distribution in Macaca fascicularis (Cynomolgus)

Teofilovski-Parapid

Kreclović

1998

Lab Anim

View full text Add to dashboard Cite

SummaryThe studies were performed using stereomicroscopic dissection, and light microscopy examination on hearts of healthy and fertile non-human primates (Macaca fascicularis) of both sexes. The results indicate that the anatomy of the coronary arteries offers points of similarity as well as departure from humans. The blood supply to the hearts was by left [LCAI and right (RCA) coronary arteries. The LCA averaged 1.78 ± 0.29 (SDlmm (range 1.40-2.40 mm) in external diameter at its origin, and 4.34 ± 1.29 (SD)mm (range 1.8-6.5 mm) in length. It usually terminated by dividing into a left anterior descending artery (LAD)and the circumflex branch [CXA).The CXA branch coursed along the left part of the atrioventricular groove and gave off a varying number of branches to the left ventricle and atrium along its course. It averaged 1.14±0.30 (SD)mm (range 0.70-1.70mm) in external diameter at its origin. The LAD averaged 1.28± 0.25 (SD)mm (range 0.90 ± 1.80mm) in external diameter at its origin. In 73% cases the LAD continued over the apex to course dorsally in the posterior interventricular groove, and gave off a varying number of diagonal and septal branches. The RCA arose from the right aortic sinus and coursed along the right part of the atrioventricular groove and averaged 0.94±0.15 (SDlmm (range 0.70-1.20mml in external diameter at its origin. The posterior descending coronary artery (PDCA) arose from the LCA in 55% of the cases, and from the RCA in 45%. Myocardial bridges (MB)were present in 54% of the hearts and over the LCA branches exclusively. The average length of all MB was 5.68 ±3.31(SD) mm (range 2.4-11.5 mm). The coronary arteries of Macaca fascicularis are medium sized muscular arteries with well developed tunics intima, media and adventitia, and so resemble human arteries more closely than the dog. Therefore, we suggest this primate species might be a useful model for physiological studies on the coronary circulation.

show abstract

mentioning

confidence: 86%

Coronary artery distribution in Macaca fascicularis (Cynomolgus)

Teofilovski-Parapid

Kreclović

1998

Lab Anim

View full text Add to dashboard Cite

show abstract

“…Its typical angiographic presentation is the systolic "milking" effect due to transient vascular compression. [1][2][3] The frequency of MB has been reported to range from 5.4 to 85% in autopsy series [4][5][6] and from 0.5 to 29.4% on coronary angiography. 1,[6][7][8][9][10][11] Although it remains to be determined how MB affects the cardiovascular system, MB has been associated with myocardial infarction [12][13][14][15][16][17] and sudden cardiac death, [18][19][20][21] and coronary spasm is thought to be one factor connecting cardiac events and MB.…”

Section: Introductionmentioning

confidence: 99%

Myocardial bridging increases the risk of coronary spasm

Teragawa

Fukuda

Matsuda

et al. 2003

Clinical Cardiology

View full text Add to dashboard Cite

SummaryBackground: Myocardial bridging (MB) has been associated with cardiac events. Whether coronary spasm is one factor contributing to those events is unknown.Hypothesis: This study investigated whether the likelihood of coronary spasm is increased in patients with MB.Methods: A spasm-provocation test was performed by infusing acetylcholine into the left coronary artery in 114 Japanese patients with chest pain. The test result was defined as positive when the diameter of the coronary artery was reduced by ≥ 50% and ST-segment changes were documented. Myocardial bridging was defined as a > 15% reduction in coronary arterial diameter during systole after intracoronary injection of nitroglycerin.Results: Myocardial bridging was identified in 41 patients (36%) and was located in the mid-segment of the left anterior descending coronary artery (LAD) in all patients. Patients with MB experienced coronary spasm more frequently than patients without MB (MB+: 73%; MBϪ: 40%, p = 0.0006). Furthermore, among patients with a positive spasm-provocation test, coronary spasm occurred more frequently in the midsegment of the LAD in patients with MB than in those without MB (MB+: 73%; MBϪ: 45%, p = 0.0259). Multivariate regression analysis demonstrated that MB was a predictor of coronary spasm (odds ratio: 3.478, p = 0.0088).

show abstract

“…Myocardial bridging of the coronary arteries is a frequent congenital anomaly, detected in 15% to 85% of autopsy series and in 0.5% to 16% of angiographic studies (1)(2)(3)(4)(5). Although myocardial bridging is generally considered as a harmless clinical anomaly, several reports have showed an association of this condition with sudden cardiac death (6), myocardial infarction (7,8), coronary artery spasm (9) or ventricular arrhythmia (10).…”

Section: Introductionmentioning

confidence: 99%

Acute Myocardial Infarction Associated with Myocardial Bridging in a Young Adult

et al. 2004

View full text Add to dashboard Cite

A 28-year-old man was admitted because of chest pain. Emergency coronary angiography showed a massive thrombus in the proximal segment and another occlusive thrombus in the distal segment of the left anterior descending artery. He was treated with thrombolytic therapy. Repeat coronary angiography showed disappearance of the thrombi in the proximal and distal segments and obvious myocardial bridging in the mid segment. Intravascular ultrasound revealed an atherosclerotic plaque in the segment immediately proximal to the myocardial bridging, but did not reveal any plaque within or distal to the site. He was discharged 12 days later.

show abstract

Relation of myocardial bridges and loops on the coronary arteries to coronary occlusions

Cited by 226 publications

References 4 publications

Coronary artery distribution in Macaca fascicularis (Cynomolgus)

Coronary artery distribution in Macaca fascicularis (Cynomolgus)

Myocardial bridging increases the risk of coronary spasm

Acute Myocardial Infarction Associated with Myocardial Bridging in a Young Adult

Contact Info

Product

Resources

About