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.
- Coronary flow reserve
- Myocardial perfusion
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine