Estimating Years of Life Lost Due to Cardiovascular Disease in Japan

In Japan, the burden associated with myocardial infarction (MI) and ischemic stroke as well as atherosclerotic cardiovascular disease (ASCVD) generally is high. One key element in measuring disease burden is years of life lost (YLL). The aim of this study was to understand the burden of these diseases by estimating YLL at an overall disease level and average person-YLL (PYLL), a measure of disease burden also used in prior studies.

Because calculation of YLL and PYLL involves inputs such as disease prevalence, disease-related mortality by age, and general population mortality by age and sex, we searched public databases of disease surveillance to identify comprehensive Japanese-specific inputs. For our reference analysis, disease-specific prevalence and mortality were taken from the Institute for Health Metrics and Evaluation Global Disease Burden study, and background mortality data were from the Japanese life tables published by the Ministry of Health, Labour and Welfare. The average age of patients with MI or stroke was 74 and 70 years, respectively. On average, men comprised 59% and 54% of the MI and stroke population, respectively. The disease-level burden of ASCVD (inclusive of MI, stroke, and peripheral artery disease) was 2,703,711 YLL in 2017. The patient-level burden was 11.99 PYLL for MI and 9.39 PYLL for stroke.

The burden of ASCVD, MI, and stroke in terms of premature mortality is substantial in Japan, both on a population disease level and an individual patient level.