years, rising rates of diabetes and obesity are threatening to reverse the recent trends of
improvement in CVD mortality seen over the last few decades (7). Urgent actions are therefore
needed exploring various strategies to tackle this challenge.
Over the last two years large, well-conducted trials have showed that glucose lowering agents
SGLT2 inhibiotors (8,9,10) and GLP-1 analogues (11,12,13) offer substantial cardiovascular
protection, bringing new hopes in improving CV outcomes in people with type 2 diabetes. Such
cardiovascular benefits are of similar scale to that offered by statins and therefore needs to be
passed on to diabetes patients without further delay.
In the EMPA-REG trial involving about 7000 patients with type 2 diabetes and established CVD,
compared with placebo, patients on SGLT2 inhibitor Empagliflozin significantly benefited from
relative risk reduction in cardiovascular (CV) deaths, admission for heart failure and all-cause
mortality by 38%, 35% and 32% respectively (8). The NNT to prevent one death with
Empagliflozin in this trial was 39 over 3 years compared to 30 for statins. The benefit of this
glucose lowering therapy was over and above that from blood pressure control and lipid
lowering. About 80% and 77% of patients were treated with ACE inhibitors/Angiotensin receptor
blockers and statins respectively in this trial (8). Similar findings of reductions in CV deaths,
heart failure and all-cause mortality has been seen with another SGLT2 inhibitor Canagliflozin in
the CANVAS randomised controlled trial (n=6000) (9). Furthermore in a real-world multinational
observational study, CV protective effects were observed for all currently licensed SGLT2
inhibitors (10).
Looking at the CV protection offered by the GLP-1 analogues, four large trials have been
reported thus far of which two (11,12) have shown clear CV reduction in people with type 2
diabetes and in the third trial (13) a trend towards improved CV outcomes was observed. In the
LEADER study, compared with placebo, Liraglutide 1.8mg once a day significantly reduced
composite outcome of CV death, non-fatal MI and stroke in people with type 2 diabetes and
established CVD or CV risk factors (11). The NNT to avoid the composite of major
cardiovascular event with Liraglutide was 66 in this trial. Similar results were observed with
once weekly Semaglutide in the SUSTAIN -6 trial (12). In the EXSCEL trial, the direction and
scale of the CV benefits with weekly use of extended-release exenatide were in line with those
seen in the LEADER and the SUSTAIN-6 trials but the findings did not reach a statistically
significant level (13). In the ELIXA trial though, only non-inferiority of the less potent Lixisenatide
versus placebo (i.e. demonstrate CV safety) but no evidence for cardioprotection was observed
(14). The mechanisms behind these differences in achieved CV outcomes among various GLP-1
analogues are a matter of further research but likely to related to difference in their molecular
structures and affinity towards receptors in the heart and other body tissues. Overall though, the
evidence for use of Liraglutide and also Semaglutide for CV protection in patients with a high risk
of cardiovascular disease is undisputable (11,12).
Moreover there is now a drive worldwide to use SGLT2 inhibitors and GLP-1 analogues,
especially Liraglutide 1.8mg, for CV risk reduction with national and international guidelines from
the USA, Canada, Japan , Switzerland, Italy and France supporting their use in high risk
individuals with type 2 diabetes. On this background, the decision by the NICE to not address
the subject of CV benefits offered by these agents until all studies have been reported over next