|Year : 2022 | Volume
| Issue : 3 | Page : 171-172
Hyperdominant left anterior descending artery: Anomaly or aberrancy?
Department of Cardiology, Yashoda Hospitals, Somajiguda, Hyderabad, Telangana, India
|Date of Submission||09-Sep-2022|
|Date of Acceptance||22-Sep-2022|
|Date of Web Publication||14-Dec-2022|
Department of Cardiology, Yashoda Hospitals, Somajiguda, Raj Bhavan Road, Hyderabad - 500 082, Telangana
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Jariwala P. Hyperdominant left anterior descending artery: Anomaly or aberrancy?. Heart India 2022;10:171-2
A 48-year-old male, hypertensive following positive treadmill test, underwent transradial coronary angiography. It revealed a very interesting finding where the left anterior descending artery (LAD) extended beyond the cardiac apex. The continuation of the vessel along the posterior interventricular sulcus that crossed the cardiac crux to supply the posterior-lateral territory is described as hyperdominant LAD. The left circumflex artery (LCX) was nondominant with large obtuse marginal branch and diagonal branches which also supplied the posterolateral territory. The right coronary artery (RCA) was also nondominant. It also gave origin to a septal perforator [Figure 1]a, [Figure 1]b, [Figure 1]c, [Figure 1]d, [Figure 1]e, [Figure 1]f.
|Figure 1: (a-f) Coronary angiography revealed that the major LAD artery extended beyond the crux of the heart after wrapping around the apex in the posterior interventricular sulcus and into the right atrioventricular groove (Panels A; Curvilinear dashed arrow, B; Curved solid arrows, d; e). It gave origins to the large diagonal artery and first septal perforator (Panels A, Solid short arrow, c). The LCX and RCA were nondominant (Panels A, f). There was large obtuse marginal artery which had an early origin from the nondominant LCX (Panels A). There was anomalous descending septal perforator originated from the nondominant RCA (Panels F). LAD: Left anterior descending, LCX: Left circumflex, RCA: Right coronary artery|
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Apart from the hyperdominant LAD, the unusual findings of our case were, nondominant LCX and RCA, and anomalous origin of septal perforator from the RCA. The LAD is classified into three types depending upon the pattern of its termination. Should this anomaly have classified as type IV LAD or anomalous origin of the posterior descending artery (PDA)?
About 85% of people have right-dominant coronary arteries, meaning that the PDA originates from the RCA. In 10%-15% of peaple, PDA originates from the LCX, and even less often (7%) comes from both the RCA and the LCX. In very rare cases, the LAD artery may be identified as the source of PDA. When the LAD and PDA share the same epicardial channel, a condition is known as hyperdominant LAD. The clinical presentation may modify if the RCA or LCX territories are completely ceded to the LAD.
Tatari et al. described a case of hyperdominant LAD with rudimentary LCX and an absent RCA. Zhou et al. described an exceptionally extended LAD course that curved around at the apex of the heart, continued as a PDA up to the crux of the heart, formed into a sac after feeding the diaphragmatic surface of the left ventricle, and eventually ended in the posterior atrioventricular groove.
Our review in 2018 focused on the anomalous origin of the branches of the RCA, most notably the PDA, from the LAD artery or its branches, a rare coronary abnormality with only 19 cases recorded so far in 17 case reports in the literature. Although it is found by chance during a coronary angiogram, its involvement in acute coronary syndrome has serious clinical implications, including the ischemia or infarction of more than half of the left ventricular myocardium in the anterior and inferior regions. With a high index of clinical suspicion, early diagnosis and treatment are crucial.
The coronary artery architecture and what is considered normal might be difficult to define. The term “normal anatomical variations” refers to unique and relatively rare morphological features, and so fall within the umbrella of the “normal variant” category. The coronary artery abnormality (CAA) is a pattern of coronary artery disease that occurs very seldom. This most likely reflects referral bias and the varying definitions of “anomalous” and “normal variation.” According to the research, around 1% of standard autopsies have CAAs, and 0.3% - 5.6% of patients having coronary angiography had CAAs. Since the prevalence of coronary abnormalities in necropsy patients may be skewed by the cause of death, and angiography is often conducted on the suspicion of ischemia, it is possible that neither of these numbers is genuinely representative.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient (s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initial s will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed
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Conflicts of interest
There are no conflicts of interest.
PJ is a sole author of the article who is responsible for the collection of data, writing manuscript, checking, publishing and proof reading.
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