Leeches in modern medicine

Leeches have been used medicinally for centuries, with their most well-known role in the former practice of blood-letting. In modern medicine, however, the medicinal leech (Hirudo medicinalis) has found a niche role in plastic/reconstructive surgery where it can be used to reduce venous congestion and encourage microcirculation.

medicinal leeches

medicinal leeches

Specially prepared leeches are attached to the relevant part (e.g. at-risk surgical flap) and allowed to feed. Once gorged they detach themselves and are collected for re-use. Heparin wipes may be used at the bite site to prolong the therapeutic anticoagulation effect.

medicinal leeches

At our centre, collected leeches are prepared for re-use by placing in them saline – apparently this encourages them to regurgitate their initial feed. Subsequent feeds are less effective, so after 1-2 feeds the leech is “retired” using concentrated saline and flushed down a sluice sink.

3 thoughts on “Leeches in modern medicine

  1. I was hoping that the leeches used in medicine were treated better than that. we have so many here that i was starting to feel bad about killing them, and was thinking about catching and collecting them for medicinal work / research but hearing how they get treated I feel much better about putting them out of my misery here instead.

  2. So Ananda, you’d rather kill the leeches yourself, rather than donate them so they could save a life?
    That makes no sense, because you’re already killing them, and what the hospital does is probably a lot more humane than the way you kill them.

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