Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Conduction system in the swine heart: essential landmarks for gross dissection

Mingsakul, ThawornSurachon, PreeyapornSomana, Reon

Background: The components of the cardiac conduction system (CCS) were discovered almost two centuries and presented in the diagrammatic forms. This should be due to the diffi culty in distinguishing the CCS from the surrounding cardiac tissues and the lack of information concerning the precise landmarks for gross dissection. Furthermore the CCS in pig, the animal regarded as a suitable model for the assessment of catheter based intervention, has not been reported. The aims of the present study were to demonstrate the gross anatomic architecture of CCS in the swine heart, and to provide the valuable landmarks for the gross anatomic dissection of the CCS.Materials, Methods & Results: Twenty hearts of adult Large White pigs (Sus Scrofa domesticus) were used. Fifteen hearts were elucidated by gross anatomic dissection. The tissue blocks of the sinoatrial node (SAN) and atrioventricular conduction tissue of the fi ve hearts were prepared for histological investigation by staining with Massons trichrome. It was found histologically that the cardiac conduction tissues were clearly distinguishable from the surrounding cardiac myocardium and connective tissue. Moreover, the histological information also navigated the location and anatomical architecture of the CCS which provided essential guideline for gross dissection. The SAN was somewhat spindle in shape which embedded in epica

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