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Final 5 year results of SYNTAX, the RCT of CABG vs PCI

Wednesday, June 4, 2014

Submitted by

Joel Dunning

Source

Source Name: European Heart Journal

Source URL: http://eurheartj.oxfordjournals.org/content/early/2014/05/21/eurheartj.ehu213.sh…

Author(s)

Stuart J. Head1,†, Piroze M. Davierwala2,†, Patrick W. Serruys1, Simon R. Redwood3, Antonio Colombo4, Michael J. Mack5, Marie-Claude Morice6, David R. Holmes Jr7, Ted E. Feldman8, Elisabeth Ståhle9, Paul Underwood10, Keith D. Dawkins10, A. Pieter Kappetein1 and Friedrich W. Mohr2,*

Coronary artery bypass grafting (CABG) has been considered the standard of care for patients with three-vessel disease (3VD), but long-term comparative results from randomized trials of CABG vs. percutaneous coronary intervention (PCI) using drug-eluting stents (DES) remain limited. Five-year results of patients with 3VD treated with CABG or PCI using the first-generation paclitaxel-eluting DES suggest that CABG should remain the standard of care as it resulted in significantly lower rates of death, MI, and repeat revascularization, while stroke rates were similar. For patients with low SYNTAX scores, PCI is an acceptable revascularization strategy, although at a price of significantly higher rates of repeat revascularization.

Methods

Patients with de novo 3VD or left main disease were randomly assigned to PCI with the paclitaxel-eluting first-generation stent or CABG in the SYNTAX trial.
This pre-specified analysis presents the 5-year outcomes of patients with 3VD (n = 1095).

Results

The rate of major adverse cardiac and cerebrovascular events (MACCE) was significantly higher in patients with PCI compared with CABG (37.5 vs. 24.2%, respectively; P < 0.001).
Percutaneous coronary intervention as opposed to CABG resulted in significantly higher rates of the composite of death/stroke/myocardial infarction (MI) (22.0 vs. 14.0%, respectively; P < 0.001), all-cause death (14.6 vs. 9.2%, respectively; P = 0.006), MI (9.2 vs. 4.0%, respectively; P = 0.001), and repeat revascularization (25.4 vs. 12.6%, respectively; P < 0.001); however, stroke was similar between groups at 5 years (3.0 vs. 3.5%, respectively; P = 0.66).
Results were dependent on lesion complexity (P for interaction = 0.12); in patients with a low (0–22) SYNTAX score, PCI vs. CABG resulted in similar rates of MACCE (33.3% vs. 26.8%, respectively; P = 0.21) but significantly more repeat revascularization (25.4% vs. 12.6%, respectively; P = 0.038), while in intermediate (23–32) or high (≥33) SYNTAX score terciles, CABG demonstrated clear superiority in terms of MACCE, death, MI, and repeat revascularization.
Differences in MACCE between PCI and CABG were larger in diabetics [hazard ratio (HR) = 2.30] than non-diabetics (HR = 1.51), although the P for interaction failed to reach significance for MACCE (P for interaction = 0.095) or any of the other endpoints.