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Myocardial kinetics of 201Thallium, 99mTc-tetrofosmin, and 99mTc-sestamibi in an acute ischemia–reperfusion model using isolated rat heart

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Abstract

Objective

201Thallium (TL), 99mTc-tetrofosmin (TF), and 99mTc-sestamibi (MIBI) are extensively used as myocardial perfusion agents. The objective of the present study was to evaluate their kinetics under acute ischemia–reperfusion.

Methods

Isolated rat hearts, perfused by the Langendorff method at a constant flow rate of 10 ml/min, were allotted to normal control, mild ischemia, and severe ischemia groups, in which 20-min tracer wash-in was conducted followed by a 25-min tracer washout. No-flow ischemia (15 min for mild ischemia groups; 30 min for severe ischemia groups) was induced before conducting wash-in and washout in the ischemia groups. Whole-heart radioactivity was determined with an external gamma detector. Myocardial flow rate (K 1, ml/min) and clearance rate (k 2, min−1) were calculated.

Results

K 1TL, K 1TF, and K 1MIBI decreased according to the severity of ischemia (K 1TL 5.32 ± 0.53, 4.76 ± 0.70, and 1.44 ± 0.59; K 1TF 3.80 ± 0.70, 2.73 ± 0.99, and 1.09 ± 0.45; and K 1MIBI 3.45 ± 1.10, 2.15 ± 0.82, and 1.05 ± 0.13, in the normal control, mild, and severe ischemia groups, respectively). K 1 was significantly higher for TL than for the 99mTc tracers (P < 0.05), but the 99mTc tracers had equivalent K 1 values. k 2TL increased significantly (P < 0.05) in the ischemia groups (k 2TL 0.062 ± 0.013, 0.11 ± 0.045, and 0.12 ± 0.035), but showed no significant difference between the ischemia groups. k 2MIBI and k 2TF were significantly (P < 0.05) lower than k 2TL and increased significantly (P < 0.05) in the severe ischemia group (k 2TF 0.0056 ± 0.0022, 0.0037 ± 0.0015, and 0.024 ± 0.015; and k 2MIBI 0.00072 ± 0.0011, 0.00038 ± 0.00076, and 0.042 ± 0.034). k 2MIBI was significantly (P < 0.05) lower than k 2TF in the normal control and mild ischemia groups.

Conclusions

Tracer extraction was higher for TL than for the 99mTc tracers and all tracers decreased according to the severity of ischemia–reperfusion in the three tracer groups. The clearance kinetics of not only MIBI but also TF is possibly useful for the evaluation of the severity of ischemia, and the Langendorff method and a methodological approach by continuous determinations of radioactivity may serve for the quantitative analysis of tracer kinetic profiles.

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Authors and Affiliations

  1. Department of Cardiology, Tokyo Women's Medical University, Tokyo, Japan

    Kenji Fukushima & Hiroshi Kasanuki

  2. Department of Radiology, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan

    Mitsuru Momose, Chisato Kondo & Kiyoko Kusakabe

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  1. Kenji Fukushima
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  2. Mitsuru Momose
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  3. Chisato Kondo
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  4. Kiyoko Kusakabe
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  5. Hiroshi Kasanuki
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Correspondence to Mitsuru Momose.

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Fukushima, K., Momose, M., Kondo, C. et al. Myocardial kinetics of 201Thallium, 99mTc-tetrofosmin, and 99mTc-sestamibi in an acute ischemia–reperfusion model using isolated rat heart. Ann Nucl Med 21, 267–273 (2007). https://doi.org/10.1007/s12149-007-0019-x

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  • DOI: https://doi.org/10.1007/s12149-007-0019-x

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