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The clinical usefulness of electrocardiogram-gated Tc-99 m methoxy-isobutyl-isonitrile images in the detection of basal wall motion abnormalities and reversibility of stress induced perfusion defects

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Abstract

Technetium-99 m methoxy-isobutyl-isonitrile (SESTAMIBI) has been recently introduced to trace regional myocardial perfusion. Beyond blood flow distribution, a quantitative index of regional myocardial wall motion from SESTAMIBI electrocardiogram (ECG)-gated images was obtained, according to the assumption that changes in the detected radioactivity reflect changes in myocardial wall thickness during the cardiac cycle. As a preliminary study, 20 patients with coronary artery disease and regional wall motion abnormalities and 15 normal subjects were studied by SESTAMIBI scintigraphy and contrast ventriculography. Regional wall motion was analyzed by a radial method applied to both techniques. Absolute systolic changes in radioactivity and its ratio to reference normal values (wall thickening index, WTI) were determined in 9 anatomical cardiac regions according to the formula (endsystolic counting profile — enddiastolic counting profile/enddiastolic counting profile) × 100. The overall agreement between radioisotopic and ventriculographic techniques was 88% (158 of 180 segments). Normal, hypokinetic and akinetic ventriculographic segments showed WTI values of 1.1±0.2, 0.8±0.2 and 0.4 ±0.3 respectively (P< 0.001). A second clinical study was performed in 25 patients studied by stress/rest ECG-gated SESTAMIBI scintigraphy. The assumption of this part of the study was to investigate if a preserved wall thickening in segments with stress defects might predict those areas with normal resting perfusion. Partial or total normalization of regional perfusion was observed in 90% of segments with a WTI⩾0.8. These studies indicate the ECG-gated SESTAMIBI may represent a suitable technique for the simultaneous analysis of flow distribution and function. Analysis of post-exercise ECG-gated SESTAMIBI can predict the reversibility of transient perfusion defects.

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Abbreviations

ECG:

electrocardiogram

SESTAMIBI:

Technetium-99 m methoxy-isobutyl-isonitrile

WTI:

wall thickening index

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Authors and Affiliations

  1. CNR Institute of Clinical Physiology, Via Savi 8, 56100, Pisa, Italy

    Paolo Marzullo, Claudio Marcassa, Gianmario Sambuceti, Oberdan Parodi & Antonio L'Abbate

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  1. Paolo Marzullo
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  2. Claudio Marcassa
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  3. Gianmario Sambuceti
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  4. Oberdan Parodi
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  5. Antonio L'Abbate
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Marzullo, P., Marcassa, C., Sambuceti, G. et al. The clinical usefulness of electrocardiogram-gated Tc-99 m methoxy-isobutyl-isonitrile images in the detection of basal wall motion abnormalities and reversibility of stress induced perfusion defects. Int J Cardiac Imag 8, 131–141 (1992). https://doi.org/10.1007/BF01137534

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