The goal of this observational study is to investigate the prognosis of cardiovascular disease in Niigata Prefecture.

Specifically, it aims to clarify the current status of medical treatment for cardiovascular disease patients in regional cities in Japan, where the population is aging.

With patient consent, the study will track long-term medical treatment progress using health insurance claim data recorded in Japan's unique social security system.

Inclusion Criteria:

• Individuals aged 18 or older at the time of enrollment (regardless of gender).
• Individuals who have been hospitalized in the cardiology department of a participating medical institution.
• Individuals covered by Japan's National Health Insurance (NHI) or the Late-stage Elderly Medical Care System, which provide health coverage for self-employed individuals, retirees, and the elderly.

Exclusion Criteria:

• Individuals who are unable to obtain consent from themselves or their legally authorized representatives.

Eligible participants are individuals aged 18 or older who have been hospitalized in the cardiology department of a participating medical institution and are covered by Japan's National Health Insurance or the Late-stage Elderly Medical Care System