Leeches from Wales are out for blood in Irish hospitals

Despite advances in microsurgery, leeches still have a role to play in the operating theatre

Fri, Feb 28, 2014, 16:17

So you thought modern medicine was all pills and potions? Inhalers and injections? Think again – maggots, leeches and the use of silver and honey are all in a day’s work in Irish hospitals and community care now.

The first leech was apparently used in medicine about 1000BC. We import about 2,000 leeches per year at a cost of around €10 each. They are used in some of our larger hospitals in operations where there’s a need to keep blood flowing in order that small blood vessels can repair without the blood clotting. Leeches are also useful in relieving a patient of congested blood.

The southern European leech used, hiruda verbana , is imported from Biopharm in Wales, which describes itself as being at “the biting edge of science”. At any one time the company has 30,000-70,000 leeches being reared for use.

The leech has approximately 100 teeth and three jaws, meaning that a leech bite consists of roughly 30 teeth. Thankfully the leech administers its own anaesthetic as it bites and its triple-jaw arrangement means that its bite results in a neat cut.

Bleed steadily
Even after the leech has finished feeding and drops off, its work continues. It secretes several compounds into the wound while it feeds and it is these which ensure that the site continues to bleed steadily for up to 10 hours.

One of these is hirudin, an anti-thrombin. Another is calin which is responsible for prolonging the bleeding. This all gives time for a body part to re-establish its own circulation.

June O’Shea, chief pharmacist at St Vincent’s University Hospital in Dublin, says that as one of the hospitals dealing with trauma they maintain a stock of them and that leeches can be “very successful” in helping to reattach a severed finger for instance.

So despite the advances in microsurgery, leeches still clearly have a role to play in the operating theatre.

However, leeches tend to be used only as a last resort, according to Carl Peters-Bond of Biopharm, partly because of the small risk of local infection. To be healthy, like us, a leech needs a certain amount of gut flora. “We starve them down for at least six months,” he says, in order to minimise the risk.

Prof Zena Moore, head of the Royal College of Surgeons in Ireland (RCSI) school of nursing and midwifery, says that 25-50 per cent of hospital beds in this country are occupied by wound patients, with the cost of one problematic case being anything between €6,500 to €10,000 to treat.

With the rise in antibiotic resistance and the spiralling cost of wound-care, alternative ways of treating wounds are of increasing interest to healthcare professionals.

Field of battle
For centuries maggots were noticed in the field of battle to aid in the survival of those injured. Almost a century ago William Baer, an American doctor in France, treated two soldiers who had been on the battlefield for a week before being brought to a military hospital.

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