Long-term prediction of mortality and comparative treatment benefit following percutaneous or surgical revascularization

Background The SYNTAX score II 2020 (SSII-2020), which was derived and externally validated from randomized trials, was designed to predict death following percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) in patients with three-vessel disease and/or left main disease. We aimed to investigate its value in identifying the safest modality of revascularization in a non-randomized setting. Methods Five-year mortality was assessed in 7362 patients with three-vessel disease and/or left main disease enrolled in a Japanese PCI/CABG registry. New-generation drug eluting stents and imaging guidance became the default PCI strategy during enrolment of the last cohort. The discriminative ability of the SSII-2020 for 5-year mortality was assessed using Harrell's C statistic (C-index). Agreement between observed and predicted rates of all-cause mortality following either PCI or CABG and treatment benefit (absolute risk difference) for this outcome were assessed by calibration plots. Results The SSII-2020 had helpful discrimination (C-index = 0.72) and good calibration (intercept = −0.11, slope = 0.92) for 5-year mortality. The absolute risk difference in mortality between CABG and PCI (treatment benefit) was well calibrated when the whole population was grouped into quarters according to the predicted absolute risk difference of 5-year mortality. The observed differences in survival in favor of CABG were 4.2% (0.1 to 8.2%, log-rank p=0.05) and 8.5% (3.8 to 13.2%, log-rank p<0.01) in the respective third and fourth quarters. In contrast, the observed differences in survival were not significantly different in either the first (3.0% [−0.8 to 6.8%, log-rank p=0.12]) or the second quarter (1.3% [−2.4 to 5.1%, log-rank p=0.39]). Conclusions The SSII-2020 is well able to predict death at 5 years – and the mortality difference between PCI and CABG, and therefore has the potential to support decision making on revascularization in patients with three-vessel disease and/or left main coronary artery disease. FUNDunding Acknowledgement Type of funding sources: None.

Left Main Disease PCI vs CABG: A Brief Review of Important Literature

Left main coronary artery (LMCA) disease is defined as > 50% narrowing of vessel diameter; it is the disease of significant morbidity and mortality because it supplies 75% of the left ventricle, so any insult to the left main can lead to severe LV dysfunction, sudden cardiac arrest and arrhythmia. The incidence of left main disease in patients undergoing coronary angiography is 4-6%. The untreated left main disease has mortality around 20% at 1 year [1,2].Initially, the procedure of choice for the significant left main disease was coronary artery by-pass surgery (CABG), as medical therapy carries a high mortality rate as compared to CABG (36.5% vs 16.0%). Nevertheless, with the advancement in percutaneous intervention (PCI), there is a growing interest and passion in the percutaneous intervention of LMCA [3]. European [4] and American [5] guidelines recommend CABG (class I) as the treatment method of choice for LMCA in patients with all anatomical complexities. Current European treatment guidelines give PCI class I along with CABG if SYNTAX score < 22, class IIa if between 23-32, and class III (Harm) if SYNTAX > 33. Current US guidelines currently gives class IIa recommendation for PCI if syntax score is low, class IIb for a score between 23-32 and similar to European guideline's class III (Harm) for SYNTAX score > 33. We reviewed the major landmark trials that compare PCI vs CBAG as a treatment option for left main disease along with important meta-analysis

CABG versus PCI in the Treatment of Unprotected Left Main Disease in Diabetics: A Literature Review

The approach to left main coronary artery disease (CAD) in diabetic patients has been extensively debated. Diabetic patients have an elevated risk of left main disease in addition to multivessel disease. Previous trials have shown increased revascularization rates in percutaneous coronary intervention compared with coronary artery bypass grafting (CABG) but overall comparable outcomes, although many of these studies were not using the latest stent technology or CABG with arterial revascularization. Our aim is to review the most recent trials that have recently published long-term follow-up, as well as other literature pertaining to left main disease in diabetic patients. Furthermore, we will be discussing some future treatment strategies that could likely create a paradigm shift in how left main CAD is managed.