Assessment of regional quantitative analysis by ecg-gated myocardial SPECT after coronary artery bypass surgery

Takahiro Higuchi, Junichi Taki, Kenichi Nakajima, Sirou Tsuji, Tatsuya Yoneyama, Seigo Kinuya, Norihisa Tonami, Michio Kawasuji

Research output: Contribution to journalArticlepeer-review


Purpose: ECG-gated myocardial SPECT (G-SPECT) was performed before and after coronary artery bypass surgery (CABG) to investigate how this operation would affect the assessment of regional quantitative analyses. Methods: Nineteen patients with coronary artery disease underwent G-SPECT before and 1 month after uncomplicated CABG. 99mTc-MIBI 740 MBq was injected at rest, then G-SPECT was performed 60 min later. Regional ejection fraction (rEF), wall motion (WM), systolic wall thickening (WT) and % tracer uptake were evaluated by quantitative gated SPECT program (QGS). Parameters were obtained quantitatively in 16 segments based on the functional bull's eye map. Results: Percent tracer uptake increased in septum from 75 ± 11% to 78 ± 11% (p<0.001), while WT did not change (40 ± 19% to 41 ± 20%) after CABG. However, in septum rEF decreased from 17 ± 13% to 6 ± 9% (p<0.001) and WM decreased in septum from 1.6 ± 1.1 mm to 0.6 ± 0.9 mm (p<0.001). Conclusion: Significant reduction of rEF and WM despite of no deterioration of WT and % tracer uptake suggested that rEF and WM were affected by pseudoparadoxical asynergy after uncomplicated CABG. For the evaluation of regional function after CABG by G-SPECT, WT might be the preferred parameter.

Original languageEnglish
Pages (from-to)904-905
Number of pages2
Issue number9
Publication statusPublished - Jan 1 1999
Externally publishedYes


  • Coronary artery bypass graft (CABG)
  • ECG-gated myocardial SPECT
  • Quantitative gated SPECT (QGS)
  • Septal motion
  • Technetium-99m sestamibi

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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