Document Detail


Implementation and evaluation of a two-compartment model for quantification of myocardial perfusion with rubidium-82 and positron emission tomography.
MedLine Citation:
PMID:  1537087     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Positron emission tomography offers the ability to noninvasively assess regional myocardial perfusion in absolute terms (i.e., milliliters per gram per minute). Accurate estimates have been difficult to achieve with generator-produced 82Rb because of the complex behavior of this tracer in the myocardium. The aim of the present study was to determine whether regional myocardial blood flow could be assessed quantitatively with 82Rb and positron emission tomography by using a two-compartment kinetic model. Regional perfusion in milliliters per gram per minute was estimated from dynamic tomographic scans after intravenous administration of 82Rb in 18 studies in 13 intact dogs studied without intervention, after 2 and 24 hours of induced ischemia, during reperfusion after transient occlusion, or at rest and after pharmacological hyperemia after induced coronary artery stenosis. Regional flow was estimated along with the forward and backward rates of transport (k1 and k2 [minutes-1]) after the relative volume of distribution of the first compartment was fixed to 0.53 ml/ml and the tomographic parameters, the recovery and spillover fractions, were fixed to averaged values obtained in previous studies. In 36 comparisons, estimates of regional flow with 82Rb correlated well with flow measured with concomitantly administered radiolabeled microspheres (r = 0.91, p less than 0.05) over the flow range from 0.14 to 4.25 ml/g/min. A putative index of viability, k2, increased significantly in regions with severe ischemia. The results suggest that quantification of regional myocardial perfusion is possible in centers using 82Rb for estimates of myocardial perfusion when a physiologically appropriate, two-compartment model is used.
Authors:
P Herrero; J Markham; M E Shelton; S R Bergmann
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation research     Volume:  70     ISSN:  0009-7330     ISO Abbreviation:  Circ. Res.     Publication Date:  1992 Mar 
Date Detail:
Created Date:  1992-03-27     Completed Date:  1992-03-27     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0047103     Medline TA:  Circ Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  496-507     Citation Subset:  IM    
Affiliation:
Cardiovascular Division, Washington University, St. Louis, MO 63110.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Flow Velocity
Coronary Circulation
Coronary Disease / blood,  radionuclide imaging*
Dogs
Heart / radionuclide imaging*
Humans
Mathematics
Models, Cardiovascular
Myocardial Reperfusion
Rubidium Radioisotopes / diagnostic use*
Tomography, Emission-Computed / methods*
Grant Support
ID/Acronym/Agency:
HL-17646/HL/NHLBI NIH HHS; RR-01380/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/Rubidium Radioisotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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