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Cardiac calcification in renal patients: what we do and don't know.

Cardiovascular (CV) disease is one of the major causes of mortality in patients with renal diseases, with an increased odds ratio of mortality with risk factors as diverse as blood pressure (high or low), cholesterol level (high or low), left ventricular hypertrophy, vascular stiffness, chronic inflammation, and hyperhomocysteinemia. Mainly cross-sectional studies of renal patients showed excess CV calcification (CVC) compared with the general population, but a clear link between calcification and subsequent mortality is tenuous to date. Several factors have been incriminated to explain the increase in CVC in this particular population. Increased duration of dialysis therapy, dyslipidemia, altered calcium-phosphorus metabolism, and chronic inflammation have all been associated with increased CVC. However, with the shortage of large, observational, population-based, prospective studies tracking these potential risk factors and the pathogenesis of CVC in renal patients not yet sufficiently understood, it is difficult with the present state of knowledge to make robust recommendations about care strategies. The purpose of this review is to examine the 10 available studies of renal patients that have used modern CVC imaging and quantification techniques for clues to likely targets for future interventional studies.