Heart bypass grafts fail more often than expected, study finds
A Swedish study tracking nearly 2,000 bypass patients for 17 years reveals that graft failure accounts for only a fraction of recurring heart problems after surgery. The finding challenges assumptions about what causes symptom recurrence and could reshape how doctors monitor and treat post-surgery cardiac patients.
Originaltitel: Internal thoracic artery graft failure and recurrence of symptoms following single-vessel coronary artery bypass graft surgery
<p>Objectives: Coronary events and disease recurrence following coronary artery bypass (CABG) surgery could derive from either failure in the internal thoracic artery (ITA) graft, failure in other conduits or progressive disease in the coronaries. We aim to estimate the contribution of ITA graft failure to the recurrence of symptoms after CABG surgery.</p><p>Methods: Within the Swedish Web System for Enhancement and Development of Evidence-Based Care in Heart Disease Evaluated According to Recommended Therapies registry, we identified patients who had coronary artery bypass grafting from 1997 to 2020 with a single-vessel ITA graft bypass. Deaths, postoperative incidence of coronary angiography and the presence of a failed graft at the time of the angiography were recorded.</p><p>Results: The study population consisted of 1939 patients with a mean follow-up time (SD) of 17.2 (5.6) years. The cumulative incidence (95% CI) at 20 years for a first clinically-driven postoperative angiography was 38.6% (36.2-41.1). A failed ITA graft was reported in 16.4% of the angiographies.</p><p>Conclusions: A substantial part of recurrent symptoms of coronary artery disease do not seem to be related to ITA failure. Disease progression in the native coronary vessels may instead be the main driver of symptom recurrence.</p>