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Medicinal Leech: Therapy, Effects & Uses

Medicinal leeches are annelid worms used therapeutically in medicine. Their application improves blood circulation and has anti-inflammatory effects.

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Things worth knowing about "Medicinal leech"

Medicinal leeches are annelid worms used therapeutically in medicine. Their application improves blood circulation and has anti-inflammatory effects.

What are Medicinal Leeches?

Medicinal leeches (Hirudo medicinalis) are parasitic annelid worms belonging to the class Clitellata. They inhabit freshwater environments and feed on the blood of vertebrates. In medicine, specially bred, sterile leeches are used for therapeutic purposes. Leech therapy, also known as hirudotherapy, is one of the oldest healing methods known to humanity and is today experiencing a scientifically grounded revival.

History and Tradition

The medical use of leeches dates back to ancient times. In ancient Egypt, Greece, and Rome, they were used to treat fever, inflammation, and venous congestion. In the 19th century, leech therapy reached its peak popularity in Europe before being largely replaced by modern medicine. Today, it is recognized as a complementary therapy and is being investigated scientifically.

Mechanism of Action

During the sucking process, the leech releases a variety of bioactive substances from its salivary glands into the wound. The most important active compounds include:

Hirudin: A natural anticoagulant that prevents blood clotting and improves blood flow.
Hyaluronidase: An enzyme that loosens connective tissue and promotes the distribution of other active compounds.
Destabilase: Dissolves blood clots and acts fibrinolytically.
Calin: Inhibits platelet aggregation (the clumping together of blood platelets).
Bradykinin-like substances: Cause vasodilation and promote blood circulation.
Anti-inflammatory compounds: Reduce local inflammatory responses in the tissue.

The combination of blood removal, anticoagulant, and anti-inflammatory substances creates an overall therapeutic effect that can relieve local circulatory disorders, swelling, and pain.

Medical Applications

Leech therapy is used today in various medical fields:

Microsurgery and Plastic Surgery: Improving blood supply in tissue transplants and after replantations (reattachment of severed body parts).
Orthopedics: Treatment of knee osteoarthritis (gonarthrosis) for pain relief and reduction of inflammation.
Venous disorders: Relief of symptoms in varicose veins and venous inflammation.
Hematomas: Treatment of swelling and pressure sensations caused by bruising.
Tinnitus: Some studies suggest positive effects in certain forms of tinnitus.
Naturopathy: Complementary treatment for chronic pain and inflammatory conditions.

How Leech Therapy is Performed

Leech therapy is performed exclusively by trained medical professionals. Only approved, sterile medicinal leeches are used, and they are professionally disposed of after a single use to eliminate any risk of infection transmission. Depending on the indication, between 2 and 10 leeches are applied to the affected area of the body. A single leech draws approximately 5 to 15 ml of blood over 30 to 60 minutes. After the leech detaches, the wound continues to bleed for several hours due to the anticoagulant substances, which is therapeutically intended.

Side Effects and Risks

Leech therapy is considered safe when properly administered. Possible side effects include:

Local skin irritation, itching, or allergic reactions at the bite site
Prolonged bleeding after treatment (therapeutically desired, rarely problematic)
In very rare cases, infections caused by the leech's intestinal bacterium Aeromonas hydrophila (preventable with correct application)
Scarring at the bite site

Contraindications include bleeding disorders, use of anticoagulant medications, anemia, immunodeficiency, and pregnancy.

Scientific Evidence

The effectiveness of leech therapy is scientifically supported for certain indications. The use for knee osteoarthritis is particularly well-studied, with several clinical trials demonstrating significant pain reduction and improved joint function. In microsurgery, the application is now an established standard. Further research is needed for other areas of application.

References

Michalsen A. et al. - Effectiveness of Leech Therapy in Osteoarthritis of the Knee: A Randomized, Controlled Trial. Annals of Internal Medicine, 2003.
Abdualkader A. M. et al. - Leech Therapeutic Applications. Indian Journal of Pharmaceutical Sciences, 2013.
Zaidi S. M. H. et al. - A Comprehensive Review of the Therapeutic Application of Leeches. British Journal of Medical Practitioners, 2011.

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