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Compared with the general population, older adults with end-stage renal disease (ESRD) who are frequently affected by secondary hyperparathyroidism (SHPT) are at increased risk of developing dementia. The main objective of our study was to evaluate if the risk of dementia in older (age\u00a0\u226566 years) ESRD patients differed if they were treated for SHPT.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Using the United States Renal Data System and Medicare claims, we identified 189\u2009433 older adults without a diagnosis of dementia, who initiated dialysis between 2006 and 2016. SHPT treatment was defined as the use of vitamin D analogs, phosphate binders, calcimimetics or parathyroidectomy. We quantified the association between treated SHPT and incident dementia during dialysis using a multivariable Cox proportional hazards model with inverse probability weighting, considering SHPT treatment as a time-varying exposure.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of 189\u2009433 older ESRD adults, 92% had a claims diagnosis code of SHPT and 123\u2009388 (65%) were treated for SHPT. The rate of incident dementia was 6 cases per 100 person-years among SHPT treated patients compared with 11 cases per 100 person-years among untreated patients. Compared with untreated SHPT patients, the risk of dementia was 42% lower [adjusted hazard ratio (aHR)\u00a0=\u00a00.58, 95% confidence interval (CI): 0.56\u20130.59] among SHPT treated patients. The magnitude of the beneficial effect of SHPT treatment differed by sex (Pinteraction\u00a0=\u00a0.02) and race (Pinteraction\u00a0\u2264\u00a0.01), with females (aHR\u00a0=\u00a00.56, 95% CI: 0.54\u20130.58) and those of Asian (aHR\u00a0=\u00a00.51, 95% CI: 0.46\u20130.57) or Black race (aHR\u00a0=\u00a00.51, 95% CI: 0.48\u20130.53) having a greatest reduction in dementia risk.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Receiving treatment for SHPT was associated with a lower risk of incident dementia among older patients with ESRD. This work provides additional support for the treatment of SHPT in older ESRD patients.<\/jats:p><\/jats:sec>","DOI":"10.1093\/ndt\/gfac167","type":"journal-article","created":{"date-parts":[[2022,5,4]],"date-time":"2022-05-04T03:45:24Z","timestamp":1651635924000},"page":"2111-2118","source":"Crossref","is-referenced-by-count":23,"title":["Secondary hyperparathyroidism (CKD-MBD) treatment and the risk of dementia"],"prefix":"10.1093","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9693-7433","authenticated-orcid":false,"given":"Aarti","family":"Mathur","sequence":"first","affiliation":[{"name":"Department of Surgery, Johns Hopkins University School of Medicine , Baltimore , MD, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JiYoon B","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Surgery, Johns Hopkins University School of Medicine , Baltimore , MD, 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