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      Blood Flow Distribution in Necrotic versus Nonnecrotic Rabbit Hearts

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          Abstract

          The spatial myocardial blood flow heterogeneity of the normal heart was previously investigated by means of the standard microsphere-defined regional myocardial blood flow in nonischemic hearts. We determined the probability density functions of coronary blood flows in the rabbit heart at selected macroautoradiographic 20-µm cross-sections of the left ventricle in nonischemic as well as infarcted hearts. Macroautoradiography gave us spatial resolutions of 0.1-0.2 mm. As a tracer we used <sup>14</sup>C-iodoantipyrine given into the root of the aorta. We report here for the first time a systematic study of the shape of the flow probability density functions during acute regional myocardial necrosis. As the hearts became progressively and extensively necrotic, the distribution of flows changed its characteristics showing two independent components. The first component was the peak representing the nonischemic regions in the hearts subjected to acute ischemia. The second component was a monotonically decreasing component associated with very low flows and necrosis in the severely hypoperfused portion of the hearts. This monotonically decreasing component became larger as the extent of ischemia increased and was well separated from the peak attributable to the nonischemic regions. We could not demonstrate a leftward shift of the nonischemic central peak in the ischemic hearts. Our research shows that in transaxial radionuclide cardiac sections, such as those that might be obtained and analyzed in clinical SPECT and clinical PET, variable amounts of myocardial necrosis will result in a composite curve of myocardial blood flow heterogeneities. One portion of the curve will indicate the distribution of flows in the nonischemic zones. The other portion will vary in magnitude with the extent of ischemia, exhibit the shape of a monotonically decreasing curve. Depending upon the spatial resolution of the radionuclide imaging technique utilized, a border zone will exist representing the interface between normally perfused and occluded vascular beds. In our investigation, it was found that the border zone determined statistically was consistently and significantly smaller than the border zone determined visually.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1996
          1996
          19 November 2008
          : 87
          : 4
          : 294-299
          Affiliations
          Clinical Science Center, University of Wisconsin, Madison, Wisc, USA
          Article
          177108 Cardiology 1996;87:294–299
          10.1159/000177108
          8793162
          2cddb5aa-d3bc-4fb2-a50f-489139e7452a
          © 1996 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          History
          : 27 April 1995
          : 31 July 1995
          Page count
          Pages: 6
          Categories
          General Cardiology

          General medicine,Neurology,Cardiovascular Medicine,Internal medicine,Nephrology
          Rabbits,Myocardium,Coronary flow heterogeneity,Necrosis

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