Relationship between fractional flow reserve and graft patency after coronary artery bypass grafting

Research output: Contribution to journalArticlepeer-review


Background: Bypass for moderately stenosed coronary arteries may cause graft failure (string phenomenon or occlusion). We examined the effects of fractional flow reserve (FFR) on the efficacy of coronary artery bypass grafting (CABG) in preventing graft failure. Methods: Between January 2013 and December 2017, 48 patients underwent CABG after FFR was measured. Twenty-five grafts in 23 patients were evaluated for graft patency after the procedure. We studied stenosis of native coronary arteries, FFR, graft flow, graft patency, and the presence of pre-procedure and post-procedure myocardial ischemia. Results: Three internal thoracic arteries showed the string sign, and two saphenous vein grafts showed occlusion. All target coronary arteries for these grafts had moderate (50–75%) stenosis. Of the 25 grafts, five failed, and 20 were successful. All grafts with the string sign had been bypassed for target coronary arteries with the gray-zone FFR value (0.75–0.80). No difference in graft flow was observed between the failed and successful grafts. Patients with graft failure had no postoperative myocardial ischemia in target areas despite graft condition. Conclusion: Internal thoracic artery graft for coronary arteries with the gray-zone FFR value may exhibit the string phenomenon. We believe that graft failure occurred because the target area had no ischemia before CABG. FFR is useful in pre-operative ischemic evaluation including scintigraphy and will influence the success of revascularization, including the selection of grafts.

Original languageEnglish
Pages (from-to)1453-1459
Number of pages7
JournalGeneral Thoracic and Cardiovascular Surgery
Issue number11
Publication statusPublished - 11-2021

All Science Journal Classification (ASJC) codes

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


Dive into the research topics of 'Relationship between fractional flow reserve and graft patency after coronary artery bypass grafting'. Together they form a unique fingerprint.

Cite this