Assessment of coronary flow reserve using a combination of planar first-pass angiography and myocardial SPECT: Comparison with myocardial 15O-water PET. (1st November 2016)

• Record Type: Journal Article
• Authors: Nose, Naoko; Fukushima, Kazuhito; Lapa, Constantin; Werner, Rudolf A.; Javadi, Mehrbod Som; Taki, Junichi; Higuchi, Takahiro
• Is Part Of: International journal of cardiology. Volume 222(2016)
• Page Start: 209
• Page End: 212
• Publication Date: 2016-11-01
• Subjects: Coronary flow reserve -- SPECT -- PET -- Myocardial perfusion -- MIBI; Cardiology -- Periodicals; Electronic journals; 616.12
• DOI: 10.1016/j.ijcard.2016.07.183
• Languages: English
• ISSNs: 0167-5273

Abstract

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 = Cms Sbmb / Cmb Sbms, where subscriptsb, 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 15 O-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 15 O-water PET but underestimates flow at high flows, maybe as a reflection of pharmacokinetic limitations of MIBI.