- Author: Julia R Nunley, MD; Chief Editor: Dirk M Elston, MD more...
Calciphylaxis is a poorly understood and highly morbid syndrome of vascular calcification and skin necrosis. Bryant and White first reported it in association with uremia in 1898. However, the significance of this relationship became uncertain when vascular calcification was subsequently shown to be prevalent in uremia, yet the syndrome of vascular calcification with cutaneous necrosis remained rare.
In 1962, Selye constructed an experimental model and was able to precipitate systemic calcification, somewhat analogous to this syndrome, in nephrectomized rats. He was the first to coin the term calciphylaxis to characterize this enigma. Over the years, many other names have been suggested to characterize the pathogenic process, which has remained elusive. Interestingly, the clinical importance of this syndrome was not recognized until a 1976 report by Gipstein et al. Since then, a multitude of case reports of calciphylaxis have documented data outlining its morbidity and therapeutic dilemmas, as well as a quest to better understand its etiology and pathogenesis. Unfortunately, it remains a conundrum.
The pathogenesis of calciphylaxis remains obscure and is likely the result of a multiplicity of comorbid factors or events. Disorders that are most often implicated in the pathogenesis of calciphylaxis include chronic renal failure, obesity, diabetes mellitus, hypercalcemia, hyperphosphatemia, an elevated calcium-phosphate product, secondary hyperparathyroidism, and perhaps a variety of hypercoagulable states. Yet, although these abnormalities are extremely common in patients with end-stage renal disease (ESRD), calciphylaxis is relatively rare.
Using a rat model, Selye demonstrated that a series of events might be necessary for the formation of calciphylaxis. He defined calciphylaxis as a condition of hypersensitivity induced by a set of "sensitizing" agents, in which calcinosis occurred only in those subsequently subjected to a group of "challengers" and only after a critical lag time. Experimental sensitizing events and agents included nephrectomy and exposure to parathyroid hormone (PTH) and vitamin D. Substances used as challengers included egg albumin and metallic salts. Calciphylaxis was the end result.
Although extrapolation of animal data to humans is conjectural, it seems to be true that serial events, most consistently involving renal failure–induced abnormalities in calcium homeostasis, are required to occur over time for calciphylaxis to develop. The cause of calciphylaxis has been elusive, most likely because it is the common endpoint of a heterogeneous group of disorders.
Many molecular and cytochemical factors have been identified as crucial in bone metabolism. The receptor activator of nuclear factor-kB (RANK), RANK ligand, and osteoprotegerin appear to regulate skeletal and extraskeletal mineralization.[5, 6] Uremia-induced defects in this system may predispose to calciphylaxis. Corticosteroids, aluminum, hyperparathyroidism, liver disease, warfarin therapy, and a variety of inflammatory processes all can alter this balance and promote vascular calcification.[8, 9] Chronic inflammatory conditions may predispose to calciphylaxis by reducing serum levels of fetuin-A, an important inhibitor of calcification produced in the liver.[10, 11, 12] Other authors have recently suggested that calciphylaxis is an active form of osteogenesis with up-regulation of bone morphogenic protein 2 (BMP-2), Runx2, its target gene, and its indirect antagonist sclerostin.
Many investigators have noted that vascular occlusion and thrombosis are uniformly present and result in cutaneous ischemia[14, 15, 16] ; however the factors associated with thrombosis are not uniform.
Calciphylaxis is an uncommon condition that affects 1-4% of the population with ESRD.[17, 18] A concern exists that the incidence has increased during the last decade because of a number of possible factors, including more widespread use of parenteral vitamin D and iron dextran. No good data are available regarding the incidence of calciphylaxis in the general population without ESRD, but it is probably exceedingly rare.
Although the disease may affect persons of any race, it appears to be more prevalent in whites.
Females are affected more often than males, with a female-to-male ratio of approximately 3:1. Females also appear to be more commonly affected with nonuremic calciphylaxis.
Calciphylaxis has been reported in individuals ranging in age from 6 months to 83 years. From a large series of patients, a mean patient age of 48 years (±16 y) has been calculated. Individuals seemingly more predisposed are younger patients who have had a longer duration of renal replacement therapy.
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