Cardiovascular disease morbidity is associated with social deprivation in subjects with familial hypercholesterolaemia (FH): A retrospective cohort study of individuals with FH in UK primary care and the UK Simon Broome register, linked with national hospital records.

BACKGROUND

Social deprivation is associated with higher cardiovascular disease (CVD) morbidity and mortality. We examined whether this is also observed in people with Familial Hypercholesterolaemia (FH).

METHODS

Subjects with FH and linked secondary care records in Hospital Episode Statistics (HES) were identified from UK Clinical Practice Research Datalink (CPRD) and the Simon Broome (SB) adult FH register. Cox proportional hazards regression estimated hazard ratios (HR) for composite CVD outcomes (first HES outcome of coronary heart disease, myocardial infarction, angina, stroke, transient ischaemic attack, peripheral vascular disease, heart failure, coronary revascularisation interventions (PCI and CABG)) in Index of Multiple Deprivation (IMD) quintiles.

RESULTS

We identified 4309 patients with FH in CPRD (1988-2020) and 2956 in the SB register. Both cohorts had considerably fewer subjects in the most deprived compared to the least deprived quintile (60 % lower in CPRD and 52 % lower in SB). In CPRD, the most deprived individuals had higher unadjusted HRs for composite CVD (HR 1.71 [CI 1.22-2.40]), coronary heart disease (HR 1.63 [1.11-2.40]) and mortality (HR 1.58 [1.02-2.47]) compared to the least deprived but these became insignificant after adjusting for age, sex, smoking and alcohol consumption. In the SB register, hazard ratios for composite CVD increased with increasing deprivation quintiles and remained significant after adjustment for age, sex, smoking and alcohol consumption (adjusted HR in quintile 5 vs quintile 1 = 1.83 [1.54-2.17]).

CONCLUSIONS

Strikingly fewer individuals with FH are identified from lower socioeconomic groups, though the most deprived FH patients have the highest risk of CVD and mortality. In CPRD, this risk was largely explained by smoking and alcohol consumption, but not in the SB register. More effective strategies to detect FH and optimise risk factor management, are needed in lower socioeconomic groups.