New parameter of the right gastroepiploic arterial graft using the power spectral analysis device named MemCalc soft

Mayuko Uehara, Nobuyuki Takagi, Satoshi Muraki, Yosuke Yanase, Masaki Tabuchi, Kazutoshi Tachibana, Yasuko Miyaki, Toshiro Ito, Tetsuya Higami

Research output: Contribution to journalArticlepeer-review


OBJECTIVES: Transit-time flow measurement (TTFM) parameters such as mean graft flow (MGF, ml/min), pulsatility index (PI) and diastolic filling (DF, %) have been extensively researched for internal mammary arterial or saphenous vein grafts. In our experience of using the right gastroepiploic arterial (GEA) graft for right coronary artery (RCA) grafting, we observed unique GEA graft flow waveforms.We analysed the GEA graft flow waveforms for their effectiveness in determining GEA graft patency by power spectral analysis. METHODS: Forty-five patients underwent off-pump coronary artery bypass using the GEA graft for RCA grafting individually. The means of intraoperative MGF, PI and DF were compared between patent and non-patent grafts, postoperatively. Furthermore, the GEA flow data were output and analysed using power spectral analysis. RESULTS: Forty grafts were 'patent' and five were 'non-patent'. There were no significant differences in the mean TTFM parameters between the patent and non-patent grafts (MGF: 22 vs 8 ml/min, respectively, P = 0.068; PI: 3.5 vs 6.5, respectively, P = 0.155; DF: 63 vs 53%, respectively, P = 0.237). Results of the power spectral analysis presented clear differences; the power spectral density (PSD) of patent grafts presented high peaks at frequency levels of 1, 2 and 3 Hz, and the non-patent graft PSD presented high peaks that were not limited to these frequencies. The PSD had a sensitivity and specificity of 80 and 87.5%, respectively. CONCLUSIONS: Power spectral analysis of the GEA graft flow is useful to distinguish between non-patent and patent grafts intraoperatively. This should be used as a fourth parameter along with MGF, PI and DF.

Original languageEnglish (US)
Pages (from-to)887-892
Number of pages6
JournalEuropean Journal of Cardio-thoracic Surgery
Issue number6
StatePublished - Dec 1 2015
Externally publishedYes


  • Gastroepiploic arterial graft
  • Ischaemic heart disease
  • Off-pump coronary artery surgery
  • Power spectral analysis
  • Transit-time flow measurement

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine


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