Alzheimer’s disease (AD), the most common cause of dementia, is becoming increasingly prevalent worldwide. Understanding the current burden of AD is important in health economic evaluations of new therapies. We aimed to estimate the burden of illness, and healthcare costs of people living with AD using a large, comprehensive real-world database in England.

A retrospective cohort study was undertaken in the Discover-NOW dataset, a real-world database containing the linked primary and secondary care electronic health records of ˜3 million people living in North West London, England. Patients diagnosed with AD were followed from the later of 1 January 2010 or AD diagnosis date, to the earlier of 31 December 2021 or end of follow up (maximum 10 years). Baseline prevalence of 33 comorbidities, incidence of 7 outcomes (survival, cardiovascular, care home admission, hepatic and renal outcomes), healthcare resource utilisation and total direct healthcare costs (using National Health Service tariffs and unit cost approaches) were calculated.

Of 18,116 patients diagnosed with AD, at baseline the mean age was 81 years, 62 percent were female, 65 percent were White, 16.5 percent Asian and 8.9 percent Black. At baseline, hypertension prevalence was 60.2 percent, chronic kidney disease 35.5 percent and Type 2 diabetes 22.4 percent. The highest incidence rates across these outcomes were 13.4 (95% confidence interval [CI]:12.2,14.7) per 1,000 person years for stroke, 7.5 (95% CI: 6.6, 8.5) for myocardial infarction, and 83.6 (95% CI: 80.1, 87.0) for care home admission. Median survival was 4.9 years from diagnosis. Their annual total direct healthcare cost was GBP4,547 per patient, of which 58 percent were from hospital admissions. The majority (75%) of healthcare contacts were from primary care. AD patients had an average length of stay of 11.5 days per inpatient admission, and spent on average one week per year as inpatients.

AD is associated with high direct healthcare costs, with patients’ annual costs ˜1.7 times that of the UK population. The majority of these costs are associated with inpatient hospital admissions.