Spasticity Post-Spinal Cord Injury (Investigational Adjunct)

Patient Summary

Is this FDA-cleared for this use?

Not FDA-cleared for spasticity after spinal cord injury. FDA cleared medicinal leeches only for venous congestion in microsurgical reconstruction (K040187, June 2004). Use here is Tier C investigational.

What evidence exists?

Tier C (investigational). No RCT evidence. Evidence-based first-line management is structured physical and occupational therapy with stretching, oral antispasmodics (baclofen, tizanidine, dantrolene), and for refractory spasticity intrathecal baclofen pump, botulinum toxin injection, or selective dorsal rhizotomy. Triggers (UTI, pressure injury, constipation) must be addressed first.

Main risks

• Bleeding from each bite site for 6 to 10 hours after the leech detaches
• Iron-deficiency anemia from cumulative blood loss across multiple sessions
• Aeromonas hydrophila wound infection from leech gut bacteria (uncommon outside reconstructive surgery, but possible)
• Allergic reaction to leech saliva (rare; ranges from local itching to anaphylaxis)
• Permanent Y-shaped bite-mark scars or hyperpigmentation at attachment sites
• Local pain, bruising, swelling, or itching for 1 to 3 days after each session
• Autonomic dysreflexia in patients with injuries at T6 or above — sessions can trigger dangerous blood pressure surges
• Risk of pressure injury at bite sites in patients with sensory impairment

Who should not consider this

• Patients with spinal cord injury at T6 or above without a clear autonomic dysreflexia monitoring plan
• Patients with active UTI, pressure injury, constipation, or other spasticity triggers (treat those first)
• Anyone on blood thinners such as warfarin, apixaban, rivaroxaban, dabigatran, heparin, or daily aspirin used for medical reasons
• People with hemophilia or any other inherited bleeding disorder
• Patients with severe anemia (hemoglobin under 10 g/dL)
• People with an active infection at the planned application site
• Patients who are pregnant or breastfeeding (relative contraindication; insufficient safety data)

What to ask your clinician

• Has a recent UTI, pressure injury, ingrown toenail, or constipation episode been ruled out as the spasticity trigger?
• Am I on optimal oral antispasmodic doses?
• Have intrathecal baclofen, botulinum toxin, or surgical options been discussed?
• What is the autonomic dysreflexia monitoring plan during and after sessions?
• How will sensory loss affect bite-site monitoring for pressure or infection?
• What is the published evidence in spinal cord injury spasticity specifically?

When to seek urgent care

• Bleeding from a bite site that soaks through more than one dressing per hour
• Bleeding that continues more than 24 hours after the leech detached
• Spreading redness, warmth, swelling, pus, or red streaks around any bite site
• Fever over 38.0 C / 100.4 F, chills, or feeling suddenly unwell after a session
• Hives, facial or tongue swelling, throat tightness, or any difficulty breathing
• Sudden weakness, dizziness, fast heart rate, or fainting (possible severe blood loss)
• Sudden severe headache, sweating above the level of injury, slow heart rate, severe high blood pressure (autonomic dysreflexia — emergency)
• Spread of redness or new wound at a numb area