Assessment of coronary flow reserve using a combination of planar first-pass angiography and myocardial SPECT: Comparison with myocardial 15O-water PET

Naoko Nose, Kazuhito Fukushima, Constantin Lapa, Rudolf A. Werner, Mehrbod Som Javadi, Junichi Taki, Takahiro Higuchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Coronary flow reserve (CFR), defined as the ratio of maximum coronary flow increase from baseline resting blood flow, is one of the most sensitive parameters to detect early signs of coronary arteriosclerosis at the microvascular level. Myocardial perfusion PET is a well-established technology for CFR measurement, however, availability is still limited. The aim of this study is to introduce and validate myocardial flow reserve measurement by myocardial perfusion SPECT. Methods Myocardial perfusion SPECT at rest and ATP stress (0.16 mg/Kg/min) was performed in 10 patients with known coronary artery disease. Immediately after the injection of Tc-99m sestamibi (MIBI), left ventricular (LV) dynamic planar angiographic data were obtained for 90s. Coronary flow reserve index as measured by MIBI SPECT (CFRMIBI) was calculated as follows: CFRMIBI = CmsSbmb / CmbSbms, where subscripts b, s, Cm, and Sbm indicate baseline, during stress, myocardial counts with MIBI SPECT, and integral of LV counts with first pass angiography, respectively. Additionally, standard stress/rest 15O-water PET to estimate CFR was performed in all patients as standard of reference. Results CFRMIBI increased in conjunction with CFR, but underestimated blood flow at high flow rates. The relationship between CFRMIBI (Y) and CFRPET (X) was well fitted as follows: Y = 1.40x(1-exp(1.79/x)) (r = 0.84). Conclusions The index of CFRMIBI reflects the CFR by 15O-water PET but underestimates flow at high flows, maybe as a reflection of pharmacokinetic limitations of MIBI.

Original languageEnglish
Pages (from-to)209-212
Number of pages4
JournalInternational Journal of Cardiology
Volume222
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

Keywords

  • Coronary flow reserve
  • MIBI
  • Myocardial perfusion
  • PET
  • SPECT

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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