Sex-specific temporal trends in the incidence and prevalence of hospitalized patients with preserved versus reduced left ventricular ejection fraction heart failure: A Japanese community-wide study

Background: Sex specific temporal trends in the incidence and prevalence of hospitalization for heart failure (HF), particularly in conjunction with reduced and preserved left ventricular ejection fraction (EF) remain unclear, especially in Asian general populations. Methods: We conducted a community based HF registration study over a 10 year period in an aging cohort of the Japanese general population. Results: A total of 2598 cases of hospitalized HF were registered during the survey period. Of these 1413 cases (55%) were initial admissions for HF (incident case). The study period was divided into five 2-year terms (T1, 2003–2004; T2, 2005–2006; T3, 2007–2008; T4, 2009–2010; T5, 2011–2012), and data were compared among the terms. Age adjusted incidence of HF (per 105 person-year) remained stable in men, but decreased significantly by 25% in women (from 104 at T1 to 79 at T5; p for trend <0.05). Among incident cases who underwent echocardiography (≈90%), the proportion of HF with preserved EF increased in men (from 32% at T1 to 43% at T5; p for trend