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Published on: June 2, 2022
Sodium thiosulfate therapy for calcific uremic arteriolopathy
Sagar U Nigwekar1, Steven M Brunelli, Debra Meade
1Renal Division, Massachusetts General Hospital, Boston, Massachusetts 02114, USA. sagarnigs@gmail.com
Insights
Intravenous sodium thiosulfate (STS) showed potential in treating calcific uremic arteriolopathy (CUA), a severe condition. A majority of patients experienced clinical improvement, though more research is needed for conclusive evidence.
Area of Science:
- Nephrology
- Vascular Medicine
- Dermatology
Background:
- Calcific uremic arteriolopathy (CUA) is a severe, often fatal vascular condition in dialysis patients.
- Currently, no definitive effective treatment exists for CUA.
- Intravenous sodium thiosulfate (STS) has been anecdotally reported but not systematically studied.
Purpose of the Study:
- To systematically evaluate the efficacy and safety of intravenous sodium thiosulfate (STS) for treating calcific uremic arteriolopathy (CUA).
Main Methods:
- Retrospective analysis of 172 maintenance hemodialysis patients with CUA treated with STS.
- Data abstracted from clinical systems and physician surveys for outcomes and safety.
- Evaluated CUA lesion improvement, mortality, laboratory values, and adverse events.
Main Results:
- A majority of patients (73.6%) showed some level of clinical improvement in CUA lesions with STS treatment.
- One-year mortality was 35% in patients treated with STS.
- STS treatment led to significant reductions in serum phosphorus and parathyroid hormone levels.
- Adverse events and laboratory abnormalities were generally mild.
Conclusions:
- Intravenous sodium thiosulfate (STS) appears to offer clinical benefit for patients with calcific uremic arteriolopathy (CUA).
- While not conclusive, the study suggests STS is a potentially viable treatment option.
- Further rigorous studies are warranted to confirm efficacy and optimal use.
Background And Objective:
Calcific uremic arteriolopathy (CUA) is an often fatal condition with no effective treatment. Multiple case reports and case series have described intravenous sodium thiosulfate (STS) administration in CUA, but no studies have systematically evaluated this treatment.
Design, Setting, Participants, & Measurements:
This study included 172 patients undergoing maintenance hemodialysis who had CUA and were treated with STS between August 2006 and June 2009 at Fresenius Medical Care North America. Of these, 85% completed STS therapy. Clinical, laboratory, and mortality data were abstracted from clinical information systems. Responses to survey questionnaires sent to treating physicians regarding patient-level outcomes were available for 53 patients. Effect on CUA lesions and mortality were summarized as CUA outcomes. Relevant laboratory measures, weight (using pairwise comparisons of values before, during, and after STS), and adverse events were summarized as safety parameters.
Results:
Mean age of the cohort was 55 years, and 74% of patients were women. Median STS dose was 25 g, and median number of doses was 38. Among surveyed patients, CUA completely resolved in 26.4%, markedly improved in 18.9%, improved in 28.3%, and did not improve in 5.7%; in the remaining patients (20.8%), the response was unknown. One-year mortality in patients treated with STS was 35%. Adverse events, laboratory abnormalities, and weight-related changes were mild. Significant reductions in serum phosphorous (P=0.02) and parathyroid hormone (P=0.01) were noted during STS treatment in patients who completed the therapy.
Conclusions:
Although conclusive evidence regarding its efficacy is lacking, a majority of patients who received STS demonstrated clinical improvement in this study.
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