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Intramural Hemorrhage and Endothelial Changes in Atherosclerotic Coronary Artery After Repetitive Episodes of Spasm in X-ray-Irradiated Hypercholesterolemic Pigs

To assess whether coronary spasm affects the progression of atherosclerosis and results in evolution of myocardial infarction, the role of coronary spasm on the fine structure of conduit coronary arteries was studied morphologically. Göttingen miniature pigs were fed a semisynthetic diet containing...

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Published in:Circulation research 1989-08, Vol.65 (2), p.272-282
Main Authors: Nagasawa, Kazushige, Tomoike, Hitonobu, Hayashi, Yasuo, Yamada, Akira, Yamamoto, Torao, Nakamura, Motoomi
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container_title Circulation research
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creator Nagasawa, Kazushige
Tomoike, Hitonobu
Hayashi, Yasuo
Yamada, Akira
Yamamoto, Torao
Nakamura, Motoomi
description To assess whether coronary spasm affects the progression of atherosclerosis and results in evolution of myocardial infarction, the role of coronary spasm on the fine structure of conduit coronary arteries was studied morphologically. Göttingen miniature pigs were fed a semisynthetic diet containing 2% cholesterol and 1.1% sodium cholate. One month after being on this diet, the pigs were anesthetized and the endothelium of a branch of the left coronary artery was denuded using a balloon catheter. X-ray irradiation in a dose of 1,500 rad was given twice selectively to the area denuded, after 4 and 5 months of cholesterol feeding. Five months after endothelial denudation, transient (group A) and repetitive episodes (group B) of coronary spasm were provoked by single and periodic (five times every 5 minutes) intracoronary injections of serotonin (10 μg/kg/injection), respectively. The extent of spasm by serotonin at the previously denuded site was 84±4% (n=4) and 90±5% (n=6) narrowing in groups A and B (p=NS between groups), respectively. Forty minutes after the final administration of serotonin, the left coronary artery was relaxed by nitroglycerin, and the heart was isolated and perfuse-fixed under physiological pressure. Intramural hemorrhage was noted at the spastic site in six pigs of group B but not in group A. The average percent luminal narrowing, on cross sections at the spastic site in group B, was significantly greater than in group A (56±7% vs. 23±5%,p
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Göttingen miniature pigs were fed a semisynthetic diet containing 2% cholesterol and 1.1% sodium cholate. One month after being on this diet, the pigs were anesthetized and the endothelium of a branch of the left coronary artery was denuded using a balloon catheter. X-ray irradiation in a dose of 1,500 rad was given twice selectively to the area denuded, after 4 and 5 months of cholesterol feeding. Five months after endothelial denudation, transient (group A) and repetitive episodes (group B) of coronary spasm were provoked by single and periodic (five times every 5 minutes) intracoronary injections of serotonin (10 μg/kg/injection), respectively. The extent of spasm by serotonin at the previously denuded site was 84±4% (n=4) and 90±5% (n=6) narrowing in groups A and B (p=NS between groups), respectively. Forty minutes after the final administration of serotonin, the left coronary artery was relaxed by nitroglycerin, and the heart was isolated and perfuse-fixed under physiological pressure. Intramural hemorrhage was noted at the spastic site in six pigs of group B but not in group A. The average percent luminal narrowing, on cross sections at the spastic site in group B, was significantly greater than in group A (56±7% vs. 23±5%,p&lt;0.01). Scanning electron micrographs revealed that the endothelial lining was intact at the nonspastic site in both groups. In addition to the appearance of intercellular bridges at the spastic site in both groups, squeezing of endothelial cells and adhesion of white blood cells were present at the spastic site exclusively in group B. These findings are consistent with the hypothesis that repetitive spasm may have an important role in the progression of atherosclerosis and/or myocardial infarction. 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Göttingen miniature pigs were fed a semisynthetic diet containing 2% cholesterol and 1.1% sodium cholate. One month after being on this diet, the pigs were anesthetized and the endothelium of a branch of the left coronary artery was denuded using a balloon catheter. X-ray irradiation in a dose of 1,500 rad was given twice selectively to the area denuded, after 4 and 5 months of cholesterol feeding. Five months after endothelial denudation, transient (group A) and repetitive episodes (group B) of coronary spasm were provoked by single and periodic (five times every 5 minutes) intracoronary injections of serotonin (10 μg/kg/injection), respectively. The extent of spasm by serotonin at the previously denuded site was 84±4% (n=4) and 90±5% (n=6) narrowing in groups A and B (p=NS between groups), respectively. Forty minutes after the final administration of serotonin, the left coronary artery was relaxed by nitroglycerin, and the heart was isolated and perfuse-fixed under physiological pressure. Intramural hemorrhage was noted at the spastic site in six pigs of group B but not in group A. The average percent luminal narrowing, on cross sections at the spastic site in group B, was significantly greater than in group A (56±7% vs. 23±5%,p&lt;0.01). Scanning electron micrographs revealed that the endothelial lining was intact at the nonspastic site in both groups. In addition to the appearance of intercellular bridges at the spastic site in both groups, squeezing of endothelial cells and adhesion of white blood cells were present at the spastic site exclusively in group B. These findings are consistent with the hypothesis that repetitive spasm may have an important role in the progression of atherosclerosis and/or myocardial infarction. (Circulation Research 1989;65:272-282)</abstract><cop>Hagerstown, MD</cop><pub>American Heart Association, Inc</pub><pmid>2752540</pmid><doi>10.1161/01.res.65.2.272</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record>
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ispartof Circulation research, 1989-08, Vol.65 (2), p.272-282
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language eng
recordid cdi_osti_scitechconnect_5601548
source Freely Accessible Journals
subjects 560152 - Radiation Effects on Animals- Animals
AMINES
Angiography
ANIMAL TISSUES
ANIMALS
AROMATICS
ARTERIES
ARTERIOSCLEROSIS
AUTONOMIC NERVOUS SYSTEM AGENTS
AZAARENES
AZOLES
Biological and medical sciences
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BLOOD VESSELS
BODY
Cardiology. Vascular system
CARDIOVASCULAR DISEASES
CARDIOVASCULAR SYSTEM
CHOLESTEROL
CORONARIES
Coronary Angiography
Coronary Artery Disease - complications
Coronary Artery Disease - pathology
Coronary Artery Disease - physiopathology
Coronary heart disease
Coronary Vasospasm - complications
Coronary Vessels - radiation effects
DISEASES
DOMESTIC ANIMALS
DRUGS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ENDOTHELIUM
Endothelium, Vascular - pathology
Heart
Hemodynamics
HEMORRHAGE
Hemorrhage - etiology
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
Hypercholesterolemia - complications
INDOLES
IONIZING RADIATIONS
Male
MAMMALS
Medical sciences
MICROSCOPY
Microscopy, Electron
MINIATURE SWINE
MYOCARDIAL INFARCTION
NEUROREGULATORS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PATHOGENESIS
PATHOLOGICAL CHANGES
PERFUSED ORGANS
PYRROLES
RADIATION EFFECTS
RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT
RADIATIONS
RADIOPROTECTIVE SUBSTANCES
SEROTONIN
STEROIDS
STEROLS
SWINE
Swine, Miniature
SYMPATHOMIMETICS
SYMPTOMS
TISSUES
TRYPTAMINES
VASCULAR DISEASES
VERTEBRATES
X RADIATION
title Intramural Hemorrhage and Endothelial Changes in Atherosclerotic Coronary Artery After Repetitive Episodes of Spasm in X-ray-Irradiated Hypercholesterolemic Pigs
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