Although nocturia has been reported to increase mortality in elderly individuals, the particular risk factors that are associated with this event are unclear. Therefore, we evaluated risk factors for death in outpatients with nocturia.
Between October 2002 and December 2009, 250 consecutive patients with nocturia were enrolled in two general hospitals in Japan. Among them, 193 patients were able to be followed for at least 1 year and up to 9 years (median 4. 8 years) if the patients did not die. Mortality rates and risk factors were evaluated in the nocturic outpatients.
Two- and 5-year survival of the nocturic outpatients was 94. 6 % [95 % confidence interval (CI) = 92. 2-97. 1] and 82. 6 % (95 % CI = 75. 4-87. 8), respectively. Higher Charlson Comorbidity Score, lower body mass index (BMI) and lower Physical Component Summary of Short Form-36 item scores were significantly correlated with mortality (p < 0. 0001, p < 0. 005 and p < 0. 05, respectively) in multivariate analysis. The International Prostate Symptom Score, Pittsburgh Sleep Quality Index, Mental or Role/Social Component Summary of Short Form-36 item scores and Nocturnal Polyuria index were not significantly correlated with mortality. The mortality rate was significantly higher in subjects with an underweight BMI (
Additional attention is required for nocturic outpatients with not only a high Charlson Comorbidity Score but also an underweight BMI because of their high mortality. Large prospective studies are warranted to validate this finding and extend more.
BMC research notes. 2015 Sep 29*** epublish ***
Hiromitsu Negoro, Yoshio Sugino, Koji Nishizawa, Takeshi Soda, Yosuke Shimizu, Kenichi Yoshimura, Osamu Ogawa, Koji Yoshimura
Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Department of Urology, Kurashiki Central Hospital, Okayama, Japan. Department of Urology, Kurashiki Central Hospital, Okayama, Japan. Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Department of Clinical Trial Design and Management, Translational Research Center, Kyoto University Hospital, Kyoto, Japan. Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Department of Urology, Kyoto University Graduate School of Medicine, Kyoto, Japan.