• Scientific reports · Jun 2020

    Joint Longitudinal Low Calcium High Phosphorus Trajectory Associates with Accelerated Progression, Acute Coronary Syndrome and Mortality in Chronic Kidney Disease.

    • I-Wen Ting, Hung-Chieh Yeh, Han-Chun Huang, Hsiu-Yin Chiang, Pei-Lun Chu, and Chin-Chi Kuo.
    • Division of Nephrology, Department of Internal Medicine, China Medical University Hospital and College of Medicine, China Medical University, Taichung, Taiwan.
    • Sci Rep. 2020 Jun 15; 10 (1): 9682.

    AbstractThe effects of long-term disturbance of the mineral metabolism on patients with chronic kidney disease (CKD) are unclear. We investigated whether the longitudinal Ca-P (joint calcium and phosphorus) trajectories are associated with incident end-stage renal disease (ESRD), acute coronary syndrome (ACS), and all-cause mortality in patients with CKD. We conducted a prospective cohort study by using data from a 13-year multidisciplinary pre-ESRD care registry. The final study population consisted of 4,237 CKD patients aged 20-90 years with data gathered from 2003 to 2015. Individuals' Ca-P trajectories were defined using group-based multi-trajectory modeling into three distinct patterns: reference, moderately abnormal, and severely abnormal. Times to ESRD, ACS, and death were analyzed using multiple Cox regression. Compared with those with a "reference" Ca-P trajectory, the adjusted hazard ratios (aHRs) (95% confidence interval [CI]) for incidental ESRD were 5.92 (4.71-7.44) and 15.20 (11.85-19.50) for "moderately abnormal" and "severely abnormal" Ca-P trajectories, respectively. The corresponding aHRs for ACS were 1.94 (1.49-2.52) and 3.18 (2.30-4.39), and for all-cause mortality, they were 1.88 (1.64-2.16) and 2.46 (2.05-2.96) for "moderately abnormal" and "severely abnormal" Ca-P trajectories, respectively. For outcomes of progression to ESRD, the detrimental effects of abnormal Ca-P trajectories were more substantial in patients with CKD stage 3 than those with CKD stage 4 or 5 (p-value for interaction < 0.001). Future studies should validate reliable longitudinal cut-offs of serum phosphorus and consider the "lowering phosphorus- the lower the better, the earlier the better" approach to phosphorus control in CKD.

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