Erythromelalgia (Investigational)

Краткая информация для пациента

Есть ли FDA-допуск для этого показания?

Not FDA-cleared for erythromelalgia. FDA cleared medicinal leeches only for venous congestion in microsurgical reconstruction (K040187, 2004). Use here is highly investigational.

Какие доказательства существуют?

Tier C (highly investigational). Only isolated case reports; there are no randomized controlled trials. Erythromelalgia management depends on etiology: aspirin for myeloproliferative-neoplasm-associated forms (must rule out JAK2 V617F mutation), sodium channel blockers (mexiletine, lidocaine) for SCN9A and primary forms, gabapentinoids for neuropathic pain, cooling and avoidance of triggers. Aspirin use in MPN-associated forms is itself an exclusion for leech therapy, creating practical incompatibility.

Основные риски

• Tissue breakdown or non-healing wounds in already fragile, hyperemic, painful skin
• Bleeding from bite sites for 6 to 24 hours after detachment
• Worsening of the pain or erythema in the first 24 hours
• Local skin infection or, rarely, Aeromonas infection
• Allergic reaction to leech saliva (uncommon)
• Permanent scars at bite sites
• Missing the diagnosis of a myeloproliferative neoplasm that requires hematology management
• Delay or replacement of evidence-based pharmacotherapy

Кому не следует это рассматривать

• Patients with MPN-associated erythromelalgia who should be on aspirin
• Patients on aspirin or antiplatelet therapy
• Patients with an active SCN9A pain crisis (sodium channel blocker first)
• Patients with concurrent skin breakdown in the affected area
• Patients with cooling-responsive symptoms who have not tried conventional medications
• Patients with severe anemia, hemophilia, or active infection

О чём спросить врача

• Has my erythromelalgia been classified as primary (SCN9A or idiopathic) or secondary (MPN, autoimmune, drug-related)?
• Has a hematology workup been completed (CBC, JAK2 V617F, peripheral smear)?
• Have I tried aspirin (if MPN-associated), mexiletine, lidocaine patches, or gabapentinoids?
• What are my known triggers, and what is my cooling and trigger-avoidance plan?
• Has the practitioner explained why leech therapy is incompatible with aspirin in MPN-associated forms?
• What is the realistic expectation of benefit, and what is the duration?
• What is the practitioner's experience and Aeromonas-prevention plan?

Когда срочно обратиться за медицинской помощью

• Sudden severe burning pain with skin breakdown, ulceration, or blackening (tissue breakdown — urgent care)
• New unilateral arm or leg swelling (DVT in MPN-associated forms)
• Sudden chest pain, shortness of breath, or stroke-like symptoms (thrombotic event)
• Spreading redness, pus, or red streaks (cellulitis or wound infection)
• Bleeding from a bite site lasting more than 24 to 48 hours
• Fever above 38.0 C / 100.4 F or chills
• Hives, throat tightness, or breathing difficulty