ArticleInterdisciplinary cardiovascular and thoracic surgery2025
Impact of aortic root rotation angle on new-onset first-degree atrioventricular block following mitral valve surgery.
Article in Interdisciplinary cardiovascular and thoracic surgery, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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10 authors.
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Abstract
objectivesThis study aimed to classify anatomical variations in aortic root rotation using preoperative three-dimensional transoesophageal echocardiography (3D-TEE), validate these findings with cardiac computed tomography (CT) in patients undergoing mitral valve surgery and evaluate the clinical impact on postoperative atrioventricular conduction disorders.
methodsA total of 126 patients with normal electrocardiograms who underwent isolated mitral valve surgery were included. Anatomical variation was diagnosed using 3D-TEE, and aortic root rotation angle was measured using cardiac CT. New-onset postoperative atrioventricular block (AVB) and bundle branch block were analysed.
resultsVariations of aortic root rotation were classified by 3D-TEE into two categories: 'center rotation' (normal) (85.7%, n = 108/126), where the commissure of the left and non-coronary aortic leaflet was located at center of the anterior mitral leaflet, and 'lateral rotation' (14.3%, n = 18/126), rotated to the lateral trigone side. The aortic root rotation angle, where the interatrial septum was defined as a reference, measured by cardiac CT strongly correlated with 3D-TEE findings ('center rotation' vs 'lateral rotation': 51.6° vs 64.6°, P < 0.001). The incidence of new-onset conduction disorder, all presenting with first-degree AVB, was significantly higher in the 'lateral rotation' than in the 'center rotation' (38.9% [n = 7/18] vs 5.6% [n = 6/108], P < 0.001). Aortic root rotation angles were identified as significant risk factors for postoperative first-degree AVB (odds ratio, 1.05; 95% confidential interval, 1.01-1.09; P = 0.027), with cutoff values of 58.7° predicting persistent new-onset AVB.
conclusionsAortic root rotation angle measured by cardiac CT validated 3D-TEE diagnosis of 'lateral rotation' of the aortic root. 'Lateral rotation' and larger aortic root rotation angles were significant risk factors for postoperative first-degree AVB following mitral valve surgery.
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