BACKGROUND: Gamma-glutamyl transferase (GGT) has been shown to be involved in the pathogenesis of both coronary artery disease (CAD) and liver disease, and it has been reported that the GGT-to-platelet ratio (GPR) is an independent predictor for adverse outcomes from liver fibrosis and hepatic carcinoma. However, the relation between the GPR and adverse outcomes in CAD patients after percutaneous coronary intervention (PCI) has not been investigated.
METHODS: A total of 5,636 patients enrolled in Clinical Outcomes and Risk Factors of Patients with Coronary Heart Disease after PCI, a retrospective cohort study, from January 2008 to December 2016, were divided into two groups according to GPR (GPR < 0.12, n = 2,769 and GPR = 0.12, n = 2,867). The primary outcome was long-term mortality including all-cause mortality (ACM) and cardiac mortality (CM) after PCI. The average follow-up time was 35.9 ± 22.6 months.
RESULTS: We found that there were significant differences between the two groups in the incidences of ACM (p = 0.011), CM (p = 0.001), major adverse cardiovascular events (MACEs, p < 0.024), major adverse cardiovascular and cerebrovascular events (MACCEs, p = 0.014) and bleeding events (p = 0.003). Multivariate Cox regression analyses showed that GPR was an independent predictor for ACM (hazard ratio [HR]: 1.536 [95% confidence interval [CI]:1.162-2.032], p = 0.003), CM (HR: 1.763 [95% CI: 1.283-2.424], p < 0.001), MACCEs (HR: 1.269 [95% CI: 1.066-1.511], p = 0.007) and MACEs (HR: 1.308 [95% CI: 1.089-1.570], p = 0.004) in stable CAD patients but that it was an independent predictor for only the incidence of bleeding events (HR: 3.104 [95% CI: 1.680-5.736], p < 0.001) in acute coronary syndrome (ACS) patients.
CONCLUSION: This study indicates that GPR is an independent and novel predictor of adverse long-term outcomes in CAD patients who underwent PCI.
Although interesting, it needs verification by other analogous studies.