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Clinical Applications: From Replantation to Flap Salvage
Australian hospitals have maintained a continuous clinical tradition of medicinal leech use since at least the 1970s, particularly in the field of plastic and reconstructive microsurgery. The primary indication remains venous congestion—a condition where blood flows into a replanted or grafted tissue but cannot drain out effectively. When surgical revision is not feasible, medicinal leeches provide a temporary but often critical solution.

St Vincent‘s Hospital Melbourne serves as a notable example. As a major referral center for hand trauma, the hospital has used specially-bred medical leeches in its Plastic and Reconstructive Surgery Department since the 1970s. Between 6 and 10 patients undergo leech therapy at this single facility each year, with up to 40 medically-bred leeches stored on-site in a dedicated tank. Typical applications include traumatic amputation injuries to fingers, ears, noses, and scalps.

“They are not frequently used but can be a valuable resource to us in difficult cases,” said Mr. Pedro Aguilar, a Plastic and Reconstructive Surgeon at SVHM. “These organisms can sometimes mean the difference between saving a finger and failing to replant it”. The therapy generally spans five to seven days—the time required for new blood vessels to grow across a suture line and restore consistent circulation.

The mechanism is straightforward yet powerful: each leech draws approximately 5 to 10 milliliters of blood per feeding, while its saliva delivers anesthetic, anti-inflammatory, and anticoagulant properties that facilitate the process. This combination of mechanical decompression and biochemical intervention makes medicinal leeches uniquely suited to situations where additional surgery is not viable.

“Being able to restore the blood flow using this traditional form of therapy in patients where more surgery is not a possibility is very satisfying. It‘s good to have this extra option in our toolkit,” Mr. Aguilar noted.

Other major Australian hospitals, including Royal Melbourne Hospital and Royal Prince Alfred Hospital in Sydney, also maintain procurement relationships with certified leech suppliers for similar clinical applications. While the annual patient volume remains modest, the therapy is consistently described as producing “very positive” outcomes in carefully selected cases.