European Primary Care Cardiovascular Society

Higher CVD risk with sub-optimal LDL-c lowering in many patients initiating statin therapy

Sub-optimal cholesterol response to initiation of statins and future risk of cardiovascular disease

Literature - Akyea RK, Kai J, Qureshi N et al. - Heart 2019;0:1–7. doi:10.1136/heartjnl-2018-314253

Introduction and methods

Guidelines recommend LDL-c level reduction targets to reduce CVD [1,2], which are based on a meta-analysis of cholesterol treatment trials of data of patients in whom statin therapy reduced CVD events [3]. Individuals using statins show both individual biological and genetic variability in LDL-c response [4], as well as in adherence [5]. It is, however, uncertain whether this variability in LDL-c response also exists among patients in the general population starting statin treatment for primary prevention of CVD. This study therefore assessed variability in LDL-c response in primary care patients initiated on statin treatment and their impact on future CVD events.

This large, prospective open population cohort study used data from the UK Clinical Practice Research Datalink (CPRD) of primary care electronic health records, which are linked to hospitalization and mortality databases The patients in the CPRD database are broadly representative of the general population with regard to age, sex and ethnicity. Primary care patients (n=183.213) included in this cohort initiated statin treatment between Sept 1990 and June 2016. Eligible participants (n= 165.411) had ≥2 recorded LDL-c measurements (≥1 within 12 months before statin initiation and ≥1 within 24 months after statin initiation), and were free of CVD events before initiating statin treatment. Patients with a recorded CVD event within 24 months of treatment were excluded from the analysis, because the full effect of cholesterol lowering on CVD risk has been described to be achieved after the first two years of statin therapy [6].

Sub-optimal LDL-c response was defined as <40% reduction in untreated baseline LDL-c levels within 24 months, according to current NICE Cardiovascular Disease Guidelines [1]. Study outcome was CVD events, defined as coronary heart disease (CHD), stroke/transient ischemic attack (TIA), peripheral vascular disease (PVD), or CVD-related mortality. Median follow-up was 6.2 years.

Main results

Incidence of CVD events

Incidence of constituent CVD outcomes

Conclusion

In this large prospective primary care patient cohort, more than half of patients initiated on statin therapy did not show optimal LDL-c lowering at 24 months after starting treatment. These sub-optimal responders had significantly higher risk of future CVD events (CAD, stroke/TIA, PVD), compared to those with optimal LDL-c response. Patient adherence was not assessed in this study, nor was information provided on whether statin therapy was up- or down-titrated.

References

Show references

Find this article online at Heart

Share this page with your colleagues and friends: