RT Journal Article SR Electronic T1 Association of polydoctoring and mortality among persons over 85 years with multimorbidity: a prospective cohort study in Japan JF BJGP Open JO BJGP Open FD Royal College of General Practitioners SP BJGPO.2024.0016 DO 10.3399/BJGPO.2024.0016 A1 Ando, Takayuki A1 Sasaki, Takashi A1 Abe, Yukiko A1 Nishimoto, Yoshinori A1 Hirata, Takumi A1 Tajima, Takayuki A1 Oguma, Yuko A1 Haruta, Junji A1 Arai, Yasumichi YR 2024 UL http://bjgpopen.org/content/early/2024/09/15/BJGPO.2024.0016.abstract AB Background Polydoctoring can increase the risk of care fragmentation among patients with multimorbidity, but its impact on health outcomes remains unclear.Aim To determine the effects of polydoctoring, as measured by the regularly visited facilities (RVF) indicator, on patient outcomes among older individuals with multimorbidity.Design & setting Data from the ongoing prospective cohort study, Kawasaki Aging and Wellbeing Project (KAWP), was utilised in this study. Among the 1026 KAWP participants aged 85–89 years, those with two or more chronic conditions were enrolled in this study.Method Care fragmentation and polydoctoring was evaluated using the RVF, which is a new indicator that measures the number of medical facilities consistently involved in a patient’s care. Based on RVF, mortality was analysed using the Cox proportional hazards model, with adjustments for age, sex, frailty, and number of comorbidities.Results A significant reduction in mortality rates was observed in participants with an RVF of ≥3 and 2–4 comorbidities (hazard ratio [HR] 0.43, 95% confidence interval [CI] = 0.18 to 0.99, P value = 0.048). However, no significant difference in mortality based on RVF was observed for those with ≥5 comorbidities. Notably, individuals with ≥5 comorbidities and an RVF of 0 had a significantly higher HR for death (HR 2.68, 95% CI = 1.05 to 6.84, P value = 0.039).Conclusion In older patients with multimorbidity, polydoctoring may reduce mortality in patients with ≤4 coexisting conditions, but it does not significantly impact mortality in those with ≥5 conditions. These findings provide insights for healthcare decision making in managing older patients with multimorbidity.