P2763Clinical prognosis of pure right-sided infective endocarditis without association to cardiac devices or intravenous drug abuse

Abstract Background Pure right-sided infective endocarditis (RSIE) without association with cardiac devices or intravenous drug users (IVDUs) is an entity with unclear predisposing factors and prognosis. Purpose To evaluate predisposing factors and prognosis of pure RSIE compared tothose associated to cardiac devices or IVDUs. Methods 280 consecutive patients with endocarditis were included retrospectively in a protocol of clinical and imaging follow-up. Endocarditis-related event was defined as endocarditis mortality or open-surgery requirement. Besides, a review and meta-analysis of the literature between january 2000 and december 2018 were performed. Results Fifty-two (19%) patients presented RSIE: 20 of them (39%) were pure RSIE. Intravascular catheters carriers (25% vs 3%; p=0.026) and congenital heart diseases (20% vs 0%; p=0.018) were associated to pure RSIE. These patients demonstrated the worst clinical prognosis, with the highest in-hospital mortality (25% vs 3%; p=0.026) and endocarditis-related event rate (45% vs 6%; p=0.001), being pure RSIE independently associated with in-hospital endocarditis-related events (OR=8.40; 95% CI, 1.13–62.68; p=0.038). Four studies, including ours, with 315 participants diagnosed of RSIE were evaluated in meta-analysis: 94 individuals (30%) presented pure RSIE.This group demonstrated a higher in-hospital mortality than those with cardiac devices or IVDUs (RR=2.854; 95% CI, 1.640–4.965; P<0.001; I2=0.0%; Figure 1). Figure 1. RSIE and in-hospital mortality based on groups: cases with pure RSIE versus those with cardiac devices or IVDUs. Conclusions Pure RSIE is the worst prognosis group among RSIE with the highest endocarditis-related event rate and in-hospital mortality. This growing group should stake out the benign impression and recommendations given to RSIE among IE patients.