Hyaluronidase: The Indispensable Safety Net in Filler Medicine
Hyaluronidase is the most important emergency medication in aesthetic injection medicine. Every physician who injects hyaluronic acid fillers must have hyaluronidase readily available – and know how and when to use it. This guide provides a structured overview of indications, dosage, and protocols.
What is Hyaluronidase?
Hyaluronidase is an enzyme that breaks down hyaluronic acid through hydrolysis. It cleaves the glycosidic bonds in the HA chain, thereby dissolving injected hyaluronic acid fillers. The effect begins within minutes to hours, depending on the dose and product.
Key Properties
- Onset of action: 30–60 minutes (first effect visible)
- Complete dissolution: 24–48 hours
- Effect on endogenous HA: Temporary – the body's own HA is also broken down but regenerates within weeks
- Allergy potential: Low, but allergy test recommended before use
Indications: When is Hyaluronidase Used?
1. Emergency: Vascular Occlusion (Highest Priority)
Vascular occlusion is the most dangerous complication of filler injections. Filler enters a blood vessel and blocks blood flow, with the risk of skin necrosis or blindness.
Symptoms of vascular occlusion:
- Immediate, severe pain after injection
- Pale or livid discoloration of the skin (mottling)
- Capillary refill time >2 seconds
- In case of orbital involvement: visual disturbances, eye pain
Immediate protocol for vascular occlusion:
- Stop injection immediately
- Inject hyaluronidase immediately (high dose, see below)
- Apply heat, massage
- Call emergency medical services (immediately in case of orbital involvement)
- Monitor patient, hospitalize if necessary
- Repeat hyaluronidase every 60 minutes until blood flow is restored
2. Corrections: Unexpected Results
- Tyndall effect (blue discoloration due to overly superficial injection)
- Overcorrection or asymmetry
- Nodules or granulomas
- Patient request for dissolution
- Preparation for new treatment
3. Elective Dissolution
- Dissolution of old fillers before new treatment
- Change of treatment concept
- Dissolution of fillers from other practitioners
Dosing Protocol
| Indication | Dose | Technique | Repetition |
|---|---|---|---|
| Vascular Occlusion (Emergency) | 200–500 IU | Widespread in the affected area | Every 60 min. until reperfusion |
| Tyndall Effect | 10–30 IU | Directly into the affected area | After 24–48 h if needed |
| Overcorrection / Nodules | 30–150 IU | Directly into the filler | After 2 weeks if needed |
| Elective Dissolution | 150–300 IU | Evenly in the treatment area | After 2 weeks if needed |
Practical Procedure
Preparation
- Dissolve hyaluronidase in 0.9% NaCl or 1% Lidocaine (depending on the preparation)
- Allergy test: 3 IU intradermally, wait 15 minutes (for elective use)
- In an emergency: skip allergy test – benefits outweigh risks
Injection Technique
- Fine needle (30G) or blunt cannula
- Multiple small depots in the affected area
- Gentle massage after injection for even distribution
- In case of vascular occlusion: Widespread, even beyond the visible area
Important Notes
- Hyaluronidase also breaks down endogenous HA – inform patients about temporary swelling
- Effect on cross-linked HA: Highly cross-linked fillers (e.g., Juvéderm Volux) require higher doses and longer exposure times
- New filler treatment: At least 2–4 weeks after hyaluronidase administration
- Storage: Observe cold chain, limited shelf life after reconstitution
Hyaluronidase Always on Hand – The Practice Recommendation
Every practice that injects hyaluronic acid fillers should have at least 2 ampoules of hyaluronidase in stock – immediately accessible, not in storage. In an emergency, every minute counts.
Conclusion
Hyaluronidase is not an optional accessory – it is a medical necessity for every filler user. Thorough knowledge of dosage, technique, and protocols is essential for patient safety.
