Coronary artery bypass grafting versus percutaneous coronary intervention in patients with noninsulin treated type 2 diabetes mellitus: A meta-analysis of randomized controlled trials

Ten-Year Outcomes of Percutaneous Coronary Intervention Versus Coronary Artery Bypass Grafting for Patients with Type 2 Diabetes Mellitus Suffering from Left Main Coronary Disease: A Meta-Analysis

INTRODUCTION

In this meta-analysis, we aimed to systematically compare the 10-year outcomes of percutaneous coronary intervention (PCI) versus coronary artery bypass grafting (CABG) in patients with type 2 diabetes mellitus (T2DM) suffering from left main coronary artery disease (LMCD).

METHODS

Medical Literature Analysis and Retrieval System Online (MEDLINE), http://www.ClinicalTrials.gov , Excerpta Medica dataBASE (EMBASE), Cochrane Central, Web of Science, and Google scholar were searched for publications comparing 10-year outcomes of PCI versus CABG in patients with T2DM suffering from LMCD. Cardiovascular outcomes were considered as the clinical endpoints. Statistical analysis was carried out using RevMan software (version 5.4). Risk ratios (RR) with 95% confidence intervals (CI) were used to represent the data after analysis.

RESULTS

Eight studies (three randomized trials and five observational studies) with a total number of 3835 participants with T2DM were included in this analysis; 2340 participants were assigned to the PCI group and 1495 participants were assigned to the CABG group. Results of this analysis showed that mortality (RR 0.85, 95% CI 0.73-1.00; P = 0.05), myocardial infarction (RR 0.53, 95% CI 0.35-0.80; P = 0.002), repeated revascularization (RR 0.34, 95% CI 0.26-0.46; P = 0.00001), and target vessel revascularization (RR 0.26, 95% CI 0.18-0.38; P = 0.00001) were significantly higher with PCI when compared to CABG in these patients with diabetes and LMCD. Major adverse cardiac and cerebrovascular events were also significantly higher with PCI at 10 years (RR 0.67, 95% CI 0.49-0.92; P = 0.01). However, CABG was associated with a significantly higher risk of stroke (RR 2.16, 95% CI 1.39-3.37; P = 0.0007).

CONCLUSIONS

During a long-term follow-up time period of 10 years, PCI was associated with worse clinical outcomes compared to CABG in these patients with T2DM suffering from LMCD. However, a significantly higher risk of stroke was observed with CABG. This piece of information might be vital in order to carefully choose and prevent complications following revascularization in such patients.

Impact of diabetes mellitus on immature platelet fraction and its association with coronary artery disease

BACKGROUND

Higher prothrombotic status and alterations in platelet function and thrombopoiesis are associated with diabetes mellitus (DM). We assessed the impact of diabetes and glucose control on the immature platelet fraction (IPF) and their relationship with prevalence and extent of coronary artery disease (CAD).

METHODS

Consecutive patients undergoing coronary angiography were included. Significant CAD was defined as at least one vessel stenosis greater than 50%. IPF levels were measured at admission by routine blood cells count (A Sysmex XE-2100).

RESULTS

We included 1781 patients, of whom 660 (37.1%) suffered from diabetes. Diabetes was associated with advanced age and a higher cardiovascular risk profile. No difference in the mean values of IPF were observed between patients with or without DM (3.6 ± 2.5 vs 3.5 ± 2.5, P = 0.39) and neither in the rate of patients with IPF above the median (2.9%) (51.6% vs 50.6%, P = 0.73). In patients with DM, the IPF levels did not relate with glucose control parameters (glycaemia: r = -0.024, P = 0.54, glycosylated haemoglobin: r = 0.11, P = 0.72). The prevalence of CAD was significantly lower in patients with DM and IPF greater than the median (80.5% vs 86.5%, P = 0.04, adjusted odds ratio [OR] [95% confidence interval {CI}] = 0.57[0.36-0.91], P = 0.02), while not left main/three-vessel CAD (36.9% vs 38.2%, P = 0.75, adjusted OR [95%CI] = 0.91[0.64-1.28], P = 0.90).

CONCLUSION

In the present study, neither DM nor glucose control are independent predictors of IPF above the median. In patients with DM, higher IPF levels were associated with a lower prevalence of CAD and with a similar extent of severe CAD and angiographic findings. Therefore, until new data become available, elevated IPF should not be systematically applied on a large scale as cardiovascular risk marker in patients with diabetes.