New evidence calls into question NICE's endocarditis prevention guidance.

In 2008, National Institute for Health and Care Excellence (NICE) guidelines recommended against the use of antibiotic prophylaxis (AP) before invasive dental procedures (IDPs) to prevent infective endocarditis (IE). They did so because of lack of AP efficacy evidence and adverse reaction concerns. Consequently, NICE concluded AP was not cost-effective and should not be recommended. In 2015, NICE reviewed its guidance and continued to recommend against AP. However, it subsequently changed its wording to 'antibiotic prophylaxis against infective endocarditis is not routinely recommended'. The lack of explanation of what constituted routinely (and not routinely), or how to manage non-routine patients, caused enormous confusion and NICE remained out of step with all major international guideline committees who continued to recommend AP for those at high risk.Since the 2015 guideline review, new data have confirmed an association between IDPs and subsequent IE and demonstrated AP efficacy in reducing IE risk following IDPs in high-risk patients. New evidence also shows that in high-risk patients, the IE risk following IDPs substantially exceeds any adverse reaction risk, and that AP is therefore highly cost-effective. Given the new evidence, a NICE guideline review would seem appropriate so that UK high-risk patients can receive the same protection afforded high-risk patients in the rest of the world.