Abstract
OBJECTIVES: To study the association between nocturia and brachial-ankle pulse wave velocity (baPWV) [surrogate of central arterial stiffness (CAS)] in men and to explore this association on predicting major adverse cardiovascular events (MACE). METHODS: 246 consecutive men (mean age:68.1 ± 8.4, range 36-88) newly referred to urology clinic for male-lower urinary tract symptoms(mLUTS)/nocturia were recruited. Their bilateral baPWV were measured by automatic pulse waveform analyzer. The associations between baseline characteristics, mLUTS/nocturia and baPWV(>1800cm/sec) [significant CAS] were analyzed by multivariate logistic regression. We followed the cohort for a median period of 27.5 months. Cox proportional hazard regression analysis and Kaplan-Meier method were used to study factors predicting MACE. RESULTS: The mean ( ± SE) baPWV of our cohort was 1820 ± 16cm/sec. For comparison, the reported value of the general population of similar age structure was~1650cm/sec. IPSS (total) was not associated with baPWV, whereas IPSS-Question.7(nocturia) was significantly increased with baPWV in men<70yo [nocturia=1.6 ± 1.14, 2.1 ± 1.08, 2.67 ± 1.33) for baPWV(cm/sec) <1400, 1400-1800, >1800 respectively] (P-trend=0.002). Age≥70yo (OR:2.70, 95%CI:1.52-4.76), diabetes mellitus (OR:2.26, 95%CI:1.06-4.83), hypertension (OR:1.95, 95%CI:1.10-3.45) and nocturia≥3x/night (OR:1.75, 95%CI:1.02-3.12) independently determined baPWV>1800cm/sec. The cumulative incidence rate of MACE was 46.8/1000 man-years(95%CI:30.96-68.16/1000). The addition of nocturia≥3x/night and baPWV>1800 cm/sec to the basic model improved the prediction of the development of MACE (difference in -2 log likelihood value: 11.219, p<0.001). Past history of ischemic heart (HR:5.67, 95%CI:2.02-15.88), nocturia≥3x/night (HR:2.87, 95%CI: 0.94-8.76) and baPWV>1800cm/sec (HR:5.16, 95%CI:1.79-14.90) independently predicted MACE in men. CONCLUSION: Men attending the urology clinic for male-LUTS/nocturia had higher baPWV. This association was more pronounced in men<70yo. Men presented with both nocturia≥3x/night and baPWV>1800cm/sec showed significant predilection for developing MACE.