(EBP-007) Calciphylaxis Unlocked: Vitamin K, MGP, and Real-World Care

Friday, April 10, 2026

Introduction: Calciphylaxis is a rapidly progressive, life-threatening arteriolopathy that causes severe pain, skin necrosis, and nonhealing ulcers with mortality among the highest in wound care. It’s frequently missed or misattributed early, and many patients aren’t on dialysis, so risk can be overlooked. At the bedside, teams face intense pain, fast tissue loss, infection risk, and conflicting guidance on treatments. Legacy therapies (e.g., routine sodium thiosulfate) have limited evidence, while a key biologic driver—vitamin K–dependent inhibition of soft-tissue calcification—is often underrecognized. Clinicians need a mechanism-based, practical approach that pairs early recognition and pain control with targeted therapy and meticulous wound management.

Methods: Narrative review and practice update based on contemporary clinical data summarized in the presentation, including cohort studies, randomized trials on vitamin K2 safety, and a large 2023 systematic review of sodium thiosulfate, integrated with bedside wound-care strategies.

Results:

Epidemiology/Clinical: Not strictly a “skin disease”; patients may present in any care setting, and up to one-third are not on dialysis. Skin findings progress quickly with severe pain and ulceration in adipose-rich regions. Diagnosis is primarily clinical.

Therapeutics: The largest systematic review shows no improvement in lesion outcomes or mortality with intravenous sodium thiosulfate. In contrast, vitamin K2 addresses the biologic defect by enabling MGP carboxylation; supplementation is advocated as foundational therapy and appears safe without pro-thrombotic signal in trials, including in dialysis patients. For mechanical-valve patients on warfarin, cautious introduction of vitamin K2 with INR-guided dose adjustment is proposed.

Wound Care: Optimal care requires aggressive pain management, debridement when indicated, bioburden control, moisture balance, and rigorous periwound protection; dressings are selected to match exudate and anatomy.

Discussion: Calciphylaxis is a systemic, high-mortality arteriolopathy in which vitamin K2–dependent MGP activation is central. Contemporary data do not support sodium thiosulfate as disease-modifying therapy, whereas vitamin K2 repletion directly targets the mechanistic deficit and should be integrated with comprehensive wound care and multidisciplinary management. Early recognition, protocolized supplementation, and meticulous wound practice may improve outcomes