Systematic review of efficacy of direct oral anticoagulants and vitamin K antagonists in left ventricular thrombus.

Abstract

Left ventricular thrombus (LVT) increases the risk of thrombotic events and mortality. Vitamin K antagonists (VKAs) used to treat LVT have several known risks, as a result of which direct oral anticoagulant (DOAC) use has recently increased. We aimed to evaluate the safety and efficacy of DOACs and VKAs in treating LVT. We searched PubMed, Embase, Cochrane Library trials, and Web of Science databases for studies published before 19 April 2022, involving DOAC versus VKA treatment for patients with LVT. This meta-analysis comprised 21 studies (total patients, n=3172; DOAC group, n=888; VKA group, n=2284). A statistically significant reduction in bleeding events was observed in patients on DOACs vs. those on VKAs (risk ratio (RR)=0.73, P=0.004). Patients on DOACs residing in North American and European regions and those with ischaemic heart disease (IHD) had a significantly lower risk of bleeding events than patients residing in other regions or those with a different LVT aetiology, respectively (RR=0.78, P=0.04; RR=0.38, P=0.02; and RR=0.63, P=0.009). A statistically significant reduction in stroke in patients on DOACs versus VKAs (RR=0.72, P=0.03) was observed, and patients on DOACs residing in North America and those with IHD had a significantly lower risk of stroke (RR=0.73, P=0.04, and RR=0.61, P=0.03, respectively). Compared with VKAs, DOACs are statistically associated with an increase in LVT resolution at 1month (RR=1.96, P=0.008). No statistical between-group difference in all-cause mortality (RR=0.72, P=0.05), systemic embolism (RR=0.87, P=0.74), stroke or systemic embolism (RR=0.90, P=0.50), and LVT resolution at the end of follow-up (RR=1.06, P=0.13) was observed. Compared with VKAs, DOACs significantly reduce the risk of bleeding events and stroke in LVT patients, but mortality was similar in both groups. The advantages are apparent not only in patients belonging to the predominantly white residential areas such as North American and European regions but also in patients with LVT due to IHD. DOACs show promising effects in treating LVT compared with VKAs.