Calculation of SYNTAX Scores
All baseline SYNTAX scores were calculated by an experienced
interventional cardiologist who was blinded as to the treatment modality
that was to be assigned to any particular patient. Baseline SYNTAX
scores were derived from the initial coronary angiogram, prior to any
intervention.
For those patients who underwent coronary artery bypass grafting
(standard or hybrid coronary revascularization) the SYNTAX scores were
calculated based on Farooq V et al’s methodology for the calculation of
residual SYNTAX score (16). In those patients that underwent
MIDCAB-first HCR or multi-vessel PCI, the residual SYNTAX score was
based on the final angiogram, obtained after the last stents were
placed. In those patients who had PCI-first HCR, the residual SYNTAX
score was calculated assuming patency of the LIMA to LAD graft. For the
CABG cohort, residual SYNTAX score was calculated based on the
combination of the initial angiogram together with the operation report,
assuming patency of the bypass grafts to the target vessels.