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EJNMMI Research
Published in: EJNMMI Research 1/2016

Open Access 01-12-2016 | Original research

Accelerated 99mTc-sestamibi clearance associated with mitochondrial dysfunction and regional left ventricular dysfunction in reperfused myocardium in patients with acute coronary syndrome

Authors: Atsuro Masuda, Keiichiro Yoshinaga, Masanao Naya, Osamu Manabe, Satoshi Yamada, Hiroyuki Iwano, Tatsuya Okada, Chietsugu Katoh, Yasuchika Takeishi, Hiroyuki Tsutsui, Nagara Tamaki

Published in: EJNMMI Research | Issue 1/2016

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Abstract

Background

Accelerated clearance of 99mtechnetium-sestamibi (MIBI) has been observed after reperfusion therapy in patients with acute coronary syndrome (ACS), but the mechanisms have not been fully investigated. MIBI retention may depend on mitochondrial function. The clearance rate of 11carbon-acetate reflects such mitochondrial functions as oxidative metabolism. The purpose of this study was to examine the mechanisms of accelerated MIBI clearance in ACS. We therefore compared it to oxidative metabolism estimated using 11C-acetate positron emission tomography (PET).

Methods

Eighteen patients [mean age 69.2 ± 8.7 years, 10 males (56 %)] with reperfused ACS underwent MIBI single-photon emission computed tomography (SPECT), echocardiography, and 11C-acetate PET within 3 weeks of the onset of ACS. MIBI images were obtained 30 min and 3 h after MIBI administration. Regional left ventricular (LV) function was evaluated by echocardiography. The measurement of oxidative metabolism was obtained through the mono-exponential fitting of the 11C-acetate time-activity curve (k mono).

Results

Among 95 segments of reperfused myocardium, MIBI SPECT showed 64 normal segments (group N), 14 segments with accelerated MIBI clearance (group AC), and 17 segments with fixed defect (group F). Group AC showed lower k mono than group N (0.041 ± 0.009 vs 0.049 ± 0.010, p = 0.02). Group F showed lower k mono than group N (0.039 ± 0.012 vs 0.049 ± 0.010, p = 0.01). However, k mono was similar in group AC and group F (p = 0.99).

Conclusions

Segments with accelerated MIBI clearance showed reduced oxidative metabolism in ACS. Loss of MIBI retention may be associated with mitochondrial dysfunction.
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Metadata
Title
Accelerated 99mTc-sestamibi clearance associated with mitochondrial dysfunction and regional left ventricular dysfunction in reperfused myocardium in patients with acute coronary syndrome
Authors
Atsuro Masuda
Keiichiro Yoshinaga
Masanao Naya
Osamu Manabe
Satoshi Yamada
Hiroyuki Iwano
Tatsuya Okada
Chietsugu Katoh
Yasuchika Takeishi
Hiroyuki Tsutsui
Nagara Tamaki
Publication date
01-12-2016
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2016
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/s13550-016-0196-5

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