Morphological variations of the conduction system in the atrioventricular zone and its clinical relationship in different species

Fabián Gómez-Torres, Luis Ballesteros-Acuña, Amparo Ruíz-Sauri

Research output: Contribution to journalArticlepeer-review

Abstract

Atrioventricular node is responsible for delaying the passage of the electrical impulse to ventricles in order to protect them from fast depolarizations coming from the atria. The importance of this study is to identify the morphological variations of the components of atrioventricular zone that affect the conduction system and its clinical relationship in different species of mammals. We analyzed ten human hearts, nine from horses, eight from pigs, and five from dogs without a clinical history of cardiac pathologies. Histological section thickness of 5 μm were obtained with a microtome and stained with hematoxylin–eosin and Masson's trichrome. We observed both an increase in collagen fibers and a decrease in the size of P cells (nodal pacemaker cells) within the atrioventricular node in dogs, horses and pigs in cases that presented cartilage in fibrous body. The percentage of fundamental substance in atrioventricular node was significantly higher in dogs and the percentage of collagen fibers was higher in pigs, both than in humans. The presence of cartilaginous metaplasia in cardiac fibrous skeleton from different species decreases the size of atrioventricular node and its cells and increases the percentage of collagen fibers within the node, which can reduce the transmission of the electrical impulse to ventricles and therefore predispose to the presentation of ventricular arrhythmias. Morphometric analysis has allowed us to objectively quantify each of the components of AV node and compare them in the different species.

Original languageEnglish
Pages (from-to)212-220
Number of pages9
JournalAnatomical Science International
Volume96
Issue number2
DOIs
StatePublished - Mar 2021
Externally publishedYes

Keywords

  • Arrhythmia
  • Atrioventricular node
  • Cartilage
  • Fibrous body
  • P cell

Fingerprint

Dive into the research topics of 'Morphological variations of the conduction system in the atrioventricular zone and its clinical relationship in different species'. Together they form a unique fingerprint.

Cite this