Recurrent cardiovascular and limb events in 294,428 patients with coronary or peripheral artery disease or ischemic stroke on antiplatelet monotherapy: The RESRISK cohort study

Background and aims

Utilising real-world data, we quantified the burden of cardiovascular risk factors and long-term residual risk of atherothrombotic events among routine care cohorts with coronary (CAD) or peripheral (PAD) artery disease or ischemic stroke (IS) on guideline-recommended antiplatelet monotherapy (APMT).

Methods

Retrospective cohort study using data (2010–2020) from the United Kingdom Clinical Practice Research Datalink (CPRD) and Hospital Episode Statistics, including adults with CAD, PAD or IS who were first prescribed APMT (CAD/IS: aspirin; PAD: clopidogrel). Primary outcomes (recurrent events): major adverse cardiovascular events (MACE) for CAD/PAD/IS cohorts, major adverse limb events (MALE) for PAD.

Results

266,478 CAD, 13,162 PAD, and 14,788 IS patients were included (mean age: 71 years; women 37.7%–47.5 %). Risk factor burden was high and attainment of recommended goals was low. There were 73,691, 3,121 and 7,137 MACE among CAD, PAD and IS patients, respectively (median follow-up: 89.9, 42.4 and 75.9 months, respectively), and 4,767 MALE among PAD patients. MACE incidence rate per 1000 person-years was higher in IS (268.7; 95%CI 265.3–272.0) than CAD (92.9; 95%CI 92.5–93.4) or PAD cohorts (97.2; 95%CI 94.6–99.8). MALE incidence rate was 195.9 (95%CI 192.2–199.6) per 1000 person-years. IS patients presented a lower rate of hospitalisations and longer time-to-first hospitalisation, but once hospitalised, they had a longer length-of-stay. PAD patients had the highest hospitalisation rate.

Conclusions

Among a contemporary cohort with cardiovascular disease on APMT, long-term residual atherothrombotic risk remains high despite being on APMT. Greater attention to risk factor control and use of appropriate evidence-based therapy is required to reduce residual risk among this very high-risk population.