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Morphological features of coronary arteries and lesions in hearts from five species of sharks collected from the northwestern Atlantic Ocean

Morphological features of coronary arteries and incidental lesions are reported from hearts in five species of sharks, the shortfin mako shark, Isurus oxyrhinchus Rafinesque, thresher shark Alopias vulpinus (Bonaterre), blue shark, Prionace glauca L., the smooth dogfish, Mustelus canis (Mitchill), a...

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Published in:Journal of fish diseases 2012-10, Vol.35 (10), p.741-754
Main Authors: Borucinska, J D, Obasa, O A, Haffey, N M, Scott, J P, Williams, L N, Baker, S M, Min, S J, Kaplan, A, Mudimala, R
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container_issue 10
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container_title Journal of fish diseases
container_volume 35
creator Borucinska, J D
Obasa, O A
Haffey, N M
Scott, J P
Williams, L N
Baker, S M
Min, S J
Kaplan, A
Mudimala, R
description Morphological features of coronary arteries and incidental lesions are reported from hearts in five species of sharks, the shortfin mako shark, Isurus oxyrhinchus Rafinesque, thresher shark Alopias vulpinus (Bonaterre), blue shark, Prionace glauca L., the smooth dogfish, Mustelus canis (Mitchill), and spiny dogfish, Squalus acanthias L. Sharks were collected from the northwestern Atlantic between June and August from 1996 to 2010. They were necropsied dockside and the hearts were preserved in buffered formalin. Routine sections including ventricle/conus arteriosus and the atrio‐ventricular junctions were embedded in paraffin, stained with common histological and immunohistochemical methods and examined by brightfield microscopy. Myointimal hyperplasia, medial myo‐myxomatous hyperplasia and bifurcation pads were observed commonly, and medial muscle reorientation and epicardial myeloid tissues were rare. All the above features differed in severity, prevalence and distribution depending on anatomical site and shark species/size. Morphometric analysis indicated that myomyxomatous hyperplasia is associated with luminal narrowing of blood vessels. As suggested previously, the described morphological features are most likely physiological responses to blood flow characteristics. Vascular and cardiac lesions were uncommon and included, granulomatous proliferative epicarditis with fibroepitheliomas, myxomatous epicardial expansions, medial arterial vacuolation, myocardial fibrosis, acute ventricular emboli and parasitic granulomas. The lesions of embolism, proliferative and granulomatous epicarditis and myocardial fibrosis were in all sharks associated with capture events including retained fishing hooks. The significance and aetiopathogenesis of medial vacuolation and epicardial myxomatous expansions remains unclear.
doi_str_mv 10.1111/j.1365-2761.2012.01405.x
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source Wiley-Blackwell Read & Publish Collection
subjects Alopias vulpinus
Animals
Atlantic Ocean
Body Weight
coronary arteries
Coronary Vessels - anatomy & histology
Female
Fish Diseases - epidemiology
Fish Diseases - pathology
heart
Heart Diseases - epidemiology
Heart Diseases - pathology
Heart Diseases - veterinary
intimal expansion
Isurus
Male
Marine
Mustelus canis
Myocardium - pathology
pathology
Prevalence
Prionace glauca
sharks
Sharks - anatomy & histology
Squalus acanthias
title Morphological features of coronary arteries and lesions in hearts from five species of sharks collected from the northwestern Atlantic Ocean
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