Background and aims: The specific relationship between changes in coronary plaque phenotype by optical coherence tomography (OCT) and decrease in major adverse cardiovascular events (MACE) among patients receiving lipid-lowering therapies (LLTs) is unknown. Aim was to quantify the relationship between LLTs-related improvement of coronary plaque phenotype (e.g. coronary plaque stabilization, as assessed by OCT) and MACE occurrence.
Methods: A comprehensive, systematic search of publications in PubMed, Embase, Cochrane Central Register of Controlled Trials and Web of Science was performed to identify eligible studies. A total of 8 studies (5 randomized and 3 observational) on LLTs reporting mean maximum lipid arc (LA) and mean minimum fibrous cap thickness (FCT) at baseline and during follow-up, as assessed by OCT, and incidence of MACE were selected, encompassing a total of 652 patients.
Results: Mean follow-up duration was 8.6 months. Meta-regression analysis revealed a significant direct relationship between absolute change in LA and MACE occurrence (coefficient 0.055, I2 0 %, p < 0.001), with each 10° decrease in LA being related to a 39 % MACE reduction (OR 0.61, 95 % CI 0.44-0.77). The indirect relationship between absolute change in FCT and risk of MACE was not significant (coefficient -0.011, I2 59 %, p = 0.136).
Conclusions: This analysis quantifies the potential of LLT-related modifications of coronary plaque phenotype in terms of LA decrease for reducing the risk of MACE within the first year of treatment. These findings suggest that LA changes might be a surrogate for changes in MACE.
Influenza infection is a well-established trigger of acute cardiovascular events, particularly myocardial infarction, mediated by systemic inflammation, endothelial dysfunction, and thrombosis. In this review, we examine the evidence supporting influenza vaccination as a preventive strategy in cardiovascular disease. Observational studies and randomized trials consistently show reduced cardiovascular event rates among vaccinated individuals, with the most pronounced benefit seen after myocardial infarction. Emerging data suggest that the effects of vaccination extend beyond infection prevention, involving immunomodulatory effects, including regulatory T cell activity, features of trained innate immunity, and mechanisms promoting resolution of inflammation. Unlike conventional anti-inflammatory therapies, vaccination appears to rebalance immune responses without compromising host defence. We also consider an evolutionary perspective, proposing that historical influenza exposure may have contributed to the genetic architecture of atherosclerosis. Taken together, current evidence positions influenza vaccination as a safe, low-cost, and biologically plausible intervention in the prevention of cardiovascular events. However, important questions remain. Whether revaccination during hospitalization provides added benefit in previously immunized individuals, and the potential of high-dose or next-generation vaccine platforms such as mRNA, warrant further study. Dedicated outcome trials conducted outside the influenza season are especially needed to clarify nonspecific cardiovascular benefits. Cardiologists and other stakeholders share a responsibility to implement existing guidelines with the same commitment given to statins and platelet inhibitors.

