Abstract 15551: Evening Blood Pressure Burden and Cardiac Load: A Sex-specific Association of Nocturia in the Japanese at High-risk of Cardiovascular Disease

Abstract

Introduction: Earlier epidemiologic studies have reported a significant relationship between hypertension and nocturia. However, the underlying pathophysiology has been unclear. Hypothesis: We assessed the hypothesis that blood pressure (BP) burden and cardiac load might be associated with severity of nocturia. In addition, this association was hypothesized to be moderated by sex. Methods: In the Japan Morning Surge-Home Blood Pressure Study, measurements of home BP (HBP) at evening (mean 11.2 days) as well as brain natriuretic peptide (BNP) were performed in the 4310 patients with one or more cardiovascular risks (64.9 years old, male 47%). A self-administered questionnaire included items on nocturia was used. Results: According to the number of nocturia (no void: n= 2382; one void: n=847; ≥ 2 voids per night: n=1082), significant associations of systolic BP (SBP) at evening (130 vs 130 vs 132 mmHg, p<0.0001) and logBNP (1.20 vs 1.30 vs 1.42, p<0.0001) were observed with nocturia severity. In the multinomial logistic regression analysis adjustment for confounders including age, smoking, total cholesterol, fasting blood glucose, HbA1c and clinic SBP, the use of diuretics (OR: 1.26, 95%CI: 1.06-1.52, p<0.05) was significantly associated with one nocturnal void, while evening SBP (OR: 1.009, 95%CI: 1.003-1.014, p<0.01) and logBNP (1.43, 95%CI: 1.19-1.73, p<0.001) were significantly associated with multiple nocturnal voids. While no significant interaction was found between evening SBP and logBNP for multiple nocturnal voids in the total population (p=0.1), a significant interaction was found between evening SBP and logBNP for multiple nocturnal voids only in females (p<0.05). Conclusions: In conclusion, the use of diuretics was a significant indicator of single nocturnal void, while evening SBP and BNP were those of multiple nocturnal voids in the high-risk Japanese population. Specifically, in the females, treatment to reduce BP burden as well as cardiac overload might be important to improve sleep disturbance caused by nocturia.