Conference Coverage
FAME 2 Favorable PCI Results Driven by Revascularization
Major Finding: The percentage of patients who had an MI, death, or urgent revascularization (the combined primary end point) was significantly...
HOUSTON – Most nongrafted, moderately stenosed coronary arteries progress to severe stenosis or occlusion in the long term, results from a large, long-term study have shown.
“Not uncommonly, patients referred for coronary surgery have one or more coronary arteries with only moderate stenosis,” Joseph F. Sabik III, MD, said at the annual meeting of the Society of Thoracic Surgeons.
“There is controversy as to whether arteries with only moderate stenosis should be grafted during coronary surgery, and if it should be grafted, with what conduit?” For example, the Fractional Flow Reserve-Guided PCI versus Medical Therapy in Stable Coronary Disease study, known as FAME, suggests not intervening on moderate stenosis, since stenting non–ischemia-producing lesions led to worse outcomes (N Engl J Med. 2012 Sep 13;367:991-1001). However, Dr. Sabik, who chairs the department of surgery at University Hospitals Cleveland Medical Center, and his associates recently reported that grafting moderately stenosed coronary arteries during surgical revascularization is not harmful and can be beneficial by improving survival if an internal thoracic artery graft is used (J. Thoracic Cardiovasc Surg. 2016 Mar;151[3]:806-11).
In an effort to determine how grafting moderately stenosed coronary arteries influences native-vessel disease progression, and whether grafting may be protective from late ischemia, Dr. Sabik and his associates evaluated the medical records of 55,567 patients who underwent primary isolated coronary artery bypass graft (CABG) surgery at the Cleveland Clinic from 1972 to 2011. Of the 55,567 patients, 1,902 had a single coronary artery with angiographically moderate stenosis (defined as a narrowing of 50%-69%) and results of at least one postoperative angiogram available. Of these moderately stenosed coronary arteries (MSCAs), 488 were not grafted, 385 were internal thoracic artery (ITA)–grafted, and 1,028 were saphenous vein (SV)–grafted. At follow-up angiograms, information about disease progression was available for 488 nongrafted, 371 ITA-grafted, and 957 SV-grafted MSCAs, and patency information was available for 376 ITA and 1,016 SV grafts to these MSCAs. Grafts were considered patent if they were not occluded. Severe occlusion was defined as a narrowing of more than 70%.
Dr. Joseph F. Sabik
The researchers found that at 1, 5, 10, and 15 years, native-vessel disease progressed from moderate to severe stenosis/occlusion in 32%, 52%, 66%, and 72% of nongrafted MSCAs, respectively; in 55%, 73%, 84%, and 87% of ITA-grafted MSCAs, and in 67%, 82%, 90%, and 92% of SV-grafted MSCAs. After Dr. Sabik and his associates adjusted for patient characteristics, disease progression in MSCAs was significantly higher with ITA and SV grafting, compared with nongrafting (odds ratios, 3.6 and 9.9, respectively). At 1, 5, 10, and 15 years, occlusion in grafts to MSCAs was 8%, 9%, 11%, and 15%, respectively, for ITA grafts and 13%, 32%, 46%, and 56% for SV grafts. At these same time points, protection from myocardial ischemia in ITA-grafted vs. nongrafted MSCAs was 29%, 47%, 59%, and 61%.
“Our opinion is you that shouldn’t ignore moderate lesions,” Dr. Sabik, surgeon-in-chief and vice president for surgical operations for the University Hospitals system, said in an interview at the meeting. “Although it may not help that patient over the next short period of time, over their lifespan it will. What works for intervention doesn’t necessarily mean it’s right for bypass surgery. If you have a vessel that’s only moderately stenosed you should at least consider grafting it, because moderate lesions progress over time. Bypassing it helps people live longer when you use an internal thoracic artery graft, because they are likely to remain patent. You always have to individualize the therapy, but the key is to use your grafts in the best way possible.”
Dr. Sabik disclosed that he has received research grants from Medtronic, Abbott Vascular, and Edwards Lifesciences.
