Hyperdominant left anterior descending artery continuing across left ventricular apex as posterior descending artery coexistent with aortic stenosis
© Javangula and Kaul; licensee BioMed Central Ltd. 2007
Received: 06 June 2007
Accepted: 21 October 2007
Published: 21 October 2007
We describe, in a 61 year old man, with coexistent aortic stenosis, the anomalous origin of posterior descending artery (PDA) from a stenotic left anterior descending (LAD) artery, as its continuation across the left ventricular apex, in the presence of a normally arising and atretic proximal right coronary artery. The patient underwent mechanical aortic valve replacement and triple coronary artery bypass grafting and made an uneventful recovery. To the best of our knowledge, origin of PDA as a continuation of LAD across the left ventricular apex in the presence of a normally arising but atretic proximal right coronary artery has never been described in literature before. There is one previous case report of continuation of LAD as PDA across the left ventricular apex in a patient with single left coronary coronary artery with an absent right coronary ostium. As the blood supply to the entire interventricular septum is derived from this "hyperdominant" LAD system, stenosis of LAD can be catastrophic. A review of literature of the anomalies of right coronary artery and, in particular, of its anomalous origin from LAD and its coexistence with aortic stenosis, is presented.
Employing cardiopulmonary bypass with moderate hypothermia and right superior pulmonary vein vent and using both antegrade and retrograde cold blood cardioplegic arrest, aortic valve replacement with 21 mm St Jude mechanical prosthesis and triple coronary artery saphenous vein bypass grafting to LAD, Dx and PDA was performed. Patient made uncomplicated postoperative recovery, was transferred to ward on 2nd postoperative day and home on 8th postoperative day.
No two coronary anatomic patterns are alike and there is a wide range of variability within the normal distribution. Coronary artery anomalies represent marked deviations from normal but, fortunately, have a relatively constant incidence of less than 1.5% across different racial groups [1–6]. Anatomically, the anomalies can be divided into those of origin and distribution and those with fistulae. Clinically, the anomalies are arbitrarily divided into benign and malignant, based on their potential to cause myocardial ischaemia. Of the benign anomalies, the three most common are 1) separate origins of LAD and CX in left sinus of Valsalva 2) origin of CX from right sinus of Valsalva or from right coronary artery 3) ectopic origin of right coronary artery from aorta, a high origin being particularly prone to accidental cross clamping or side clamping, or transection during aortotomy . Of the malignant abnormalities, the most common anomaly, by a wide margin, is the ectopic origin of right coronary artery from the left sinus of Valsalva .
Right coronary artery anomalies, in turn, can involve the origin and distribution of the vessel. The most common and the most significant of these is the ectopic origin of right coronary artery from the left sinus of Valsalva. The anomalous right coronary artery, which is difficult to cannulate, arises from an ectopic ostium located anterior to left main ostium in the left sinus of Valsalva and passes anteriorly between aorta and pulmonary artery before reaching the AV groove. Ostial compression during ventricular diastole or aortic distension during exercise may result in myocardial ischaemia and the clinical sequelae, though rare, may result in angina, myocardial infarction, ventricular tachycardia, syncope or sudden death in the absence of coronary atherosclerosis [7–12]. Rarely, the ectopic RCA orifice may be located posterior to the left main ostium when the right coronary artery pursues a course posterior to the aorta where it is free from great vessel compression. Out of 136 subjects with ectopic origin of right coronary artery from left sinus of Valsalva, Yamanaka et al found 135 with ectopic orifice anterior to left main ostium and only one with a posterior orifice .
Ectopic origin of RCA from posterior sinus of Valsalva, by contrast, is an extremely rare anomaly which runs a benign course with the right coronary artery having a normal distribution. It is discovered accidentally and is not associated with any ischaemic symptoms .
An abnormally high take off of right coronary artery from above the sinotubular line with a normal distribution [14, 15] or an abnormal initial intraortic course  with implications regarding angiography, angioplasty  or surgery has been described. Right coronary artery has been described at least once to arise below the aortic valve . None of the above, however, is associated with malignant compression.
Rarely, the atrioventricular branch of right coronary artery is contiguous with the main trunk of circumflex artery, and the distal LAD with distal PDA, with bi-directional blood flow and an open-ended circulation. This anomaly is benign and may serve as a collateral source should an obstruction develop at either end and should not be misinterpreted as a functioning collateral with occlusion of a proximal coronary artery .
Cheatham described the origin of right coronary artery from descending thoracic aorta in an infant with hypoplastic left heart syndrome at autopsy . Radke , Yao  and Lessick  separately reported the anomalous origin of right coronary artery from main pulmonary artery, the ischaemic potential of the anomaly and the desirability of reconstitution of double ostium coronary system.
The single left coronary artery is further classified into L1 and L2 groups by the Lipton scheme . In L1 pattern, the right coronary artery is congenitally absent, the CX is markedly dominant and provides the posterior descending branch and thereafter ascends in the right AV groove where it provides branches to right atrium and right ventricle. Yamanaka reported 20 such anomalies in 126,595 diagnostic angiograms and 1,686 coronary anomalies (0.016% incidence and 1.2% of all anomalies) and remarked on the generally benign course of this anomaly . In the even rarer L2 subtype, the right coronary ostium is congenitally absent and the right coronary artery arises from left main stem or from the proximal branches of left coronary artery. If arising from the main stem, the anomalous right coronary artery can course anterior , posterior  or in between  the great vessels, the last anomaly being not only the most common but also most likely to be associated with external compression and ischaemic symptoms.
Only 10 cases have been described of the origin of right coronary artery from LAD in L2 subtype of the single left coronary artery [29–35]. In most of these, the right coronary artery arises from proximal or mid LAD and courses to the right to gain the right AV groove or acute margin of right ventricle, with the ischemic symptoms resulting from obstructive disease in LAD or rarely in RCA [29–33] although a meandering intraseptal course can sometimes cause inferior ischaemia . Hamodraka et al reported an extremely unusual case of LAD continuing as posterior descending artery in posterior interventricular groove after going around the left ventricular apex in the absence of right coronary ostium – an intriguing variation on the L2 Lipton subtype, where RCA, instead of arising from proximal branches of left coronary artery arises as a distal continuation of LAD . Kaul et al described a single left coronary artery with separate and composite origins of proximal and distal right coronary arteries from left anterior descending and circumflex arteries .
RCA has been anecdotally reported to arise from LAD in the presence of a normally situated right coronary ostium. Kamran et al reported, in a patient requiring mitral valve replacement, the incidental discovery of an anomalous right coronary artery arising from mid LAD, which coursed along the free wall of right ventricle into the right AV groove, and continued as posterior descending artery. This was associated with a separate small proximal RCA originating from right coronary sinus, with right conus, right atrial and right ventricular branches . John described, in association with a normally arising small non dominant proximal RCA, an aberrant artery which originated proximal to an LAD stenosis and meandered anterior to the root of pulmonary artery and right ventricle, down the acute margin of the heart, on to the inferior surface of heart to terminate as the posterior descending artery, the patient undergoing LIMA graft to LAD .
Separate origin of LAD and CX from the left coronary sinus (absent left main trunk) is found with increased incidence in aortic valve disease . Misawa et al described various strategies to deal with anomalous right coronary arteries during aortic valve surgery such as rotation of a free style bioprosthesis by a subcoronary technique, interposition saphenous vein bypass graft between ascending aorta and the separated artery and a subannular aortic valve to avoid obstucting the anomalous orifice . Ichikawa et al described aortic valve replacement for bicuspid aortic valve stenosis with single left coronary artery .
Stenosis of a hyperdominant LAD which is the sole, as was the case in our patient, or predominant blood supply to the interventricular septum may have catastrophic complications. Kaul, however, described repeated successful surgical rescues of early and delayed ruptures of ventricular septum, right ventricle and aneurysmal left ventricle following massive biventricular infarction subsequent to the occlusion of a hyperdominant LAD, albeit in the presence of a normally arising but modestly distributed RCA .
Our patient, to the best of our knowledge, is the first patient in world literature with LAD continuing as PDA across the left ventricular apex in the presence of a normally situated right coronary ostium, although with an atretic small right coronary artery. LAD continuing as PDA across the left ventricular apex has been described once but only as a variation of single left coronary artery, in the absence of a right coronary ostium . RCA has been reported to arise from mid LAD in the presence of a normally situated right coronary ostium giving rise to a small proximal right coronary, but the course has been across the free wall of right ventricle into the right AV groove  or across the root of pulmonary artery and the acute margin of heart  rather than across the LV apex as in our patient. The presence of coexistent aortic stenosis in our patient, we think, was an incidental finding rather than a component of a well known syndrome, although absent left main trunk , anomalous high origin of RCA  and single left coronary artery  have been described with aortic stenosis.
Written consent for publication was obtained from the patient
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