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Lack of evidence for longitudinal dissociation of the atrioventricular conduction axis

Lookup NU author(s): Professor Bob Anderson


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© 2023 American Association of Clinical Anatomists and British Association of Clinical Anatomists.Longitudinal dissociation of the aggregated specialized cardiomyocytes within the non-branching portion of atrioventricular conduction axis has proved a controversial topic for both morphologists and electrophysiologists. We have now used morphological methods, including three-dimensional assessment, to revisit, in human, canine, and bovine hearts, the presence or absence of interconnections between the aggregated cardiomyocytes making up the non-branching bundle. We analyzed three datasets from human and canine hearts, and two from bovine hearts, using longitudinal and orthogonal serial histological sections. In addition, we assessed three hearts using translucent India ink injected specimens, permitting assessment of the three-dimensional arrangement of the cardiomyocytes. Using the longitudinal sections, we found numerous oblique interconnections between the groups of specialized cardiomyocytes. When assessing orthogonal sections, we noted marked variation in the grouping of the cardiomyocytes. We interpreted this finding as evidence of bifurcation and convergence of the groups seen in the longitudinal sections. The three-dimensional assessment of the bovine material confirmed the presence of the numerous interconnections. The presence of multiple connections between the cardiomyocytes in the non-branching bundle rules out the potential for longitudinal dissociation.

Publication metadata

Author(s): De Almeida MC, Anderson RH, Sanchez-Quintana D, Macias Y

Publication type: Article

Publication status: Published

Journal: Clinical Anatomy

Year: 2023

Volume: 36

Issue: 5

Pages: 787-794

Print publication date: 01/07/2023

Online publication date: 21/03/2023

Acceptance date: 06/02/2023

ISSN (print): 0897-3806

ISSN (electronic): 1098-2353

Publisher: John Wiley and Sons Inc


DOI: 10.1002/ca.24022

PubMed id: 36942964


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