Dynamics of intramyocardial blood volume in the intact animal: evaluation with SPECT

Thomas Behrenbeck, Michael K. O'Connor, David A. Foley, Erik L.M.D. Ritman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Variations in blood volume in the myocardium through the cardiac cycle have previously been considered constant. More recent studies have indicated a considerably variation from end diastole to end systole. These studies were nearly all performed under non-physiological conditions using muscle preparations or ex situ cardiac preparations. This study was designed to assess the dynamic changes of the intramyocardial blood volume in the intact animal under normal flow conditions using single photon emission computed tomography (SPECT). Radiolabeled, 15 μm diameter, microspheres were emoblized in the myocardial microcirculation of dogs with subsequent scans in a TRIAD single-photon-emission-computed- tomography scanner. Gated images were obtained at 63 msec intervals encompassing the entire heart. Transmural voxel (= volume element) brightness was measured in all tomographic images reflecting global and regional count density in the myocardium. There was a significant decrease in the blood volume from end diastole to end systole (10.8 cc/100 mL muscle volume; p < 0.00001). The decrease from diastole (ED) to systole (ES) in image brightness at the apex, mid ventricle, and base were: -5.7% (p < 0.01, apex vs. base), -4.7% (p < 0.01, mid ventricle vs. base) and +2.2%, respectively. Conclusions: (1) respiratory and ECG gated SPECT images allow measurement of intramyocardial blood volume changes throughout the cardiac cycle in the intact animal; (2) myocardial blood content is maximum at ED; (3) these findings progressively diminished in magnitude from apex to base.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsEric A. Hoffman
Pages338-346
Number of pages9
StatePublished - Jan 1 1996
EventMedical Imaging 1996: Physiology and Function from Multidimensional Images - Newport Beach, CA, USA
Duration: Feb 11 1996Feb 13 1996

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume2709
ISSN (Print)0277-786X

Other

OtherMedical Imaging 1996: Physiology and Function from Multidimensional Images
CityNewport Beach, CA, USA
Period2/11/962/13/96

    Fingerprint

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Behrenbeck, T., O'Connor, M. K., Foley, D. A., & Ritman, E. L. M. D. (1996). Dynamics of intramyocardial blood volume in the intact animal: evaluation with SPECT. In E. A. Hoffman (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 338-346). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2709).