Wednesday 15 June 2011

Medical : Hirudoid & Leeches

Question time! What are the similarities between these two pictures? Take your time and look at them.

A leech
Image from
There is a leg in both pictures? Nah! The answer is very subtle!

Still no clue? Alright! Let me tell you.

First, I think most of you have used Hirudoid, the cream in the first picture, when you have an ugly bruise on your nice legs or arms (hope not on your face, you might want to call the police if you do), but have you ever wondered what bruises are?
A bruise
Image from Wikipedia
Wikipedia defines a bruise as "a type of relatively minor hematoma of tissue in which capillaries and sometimes venules are damaged by trauma, allowing blood to seep into the surrounding interstitial tissues. "[1]

In simple words, a bruise is a slight bleeding outside the blood vessels but inside your skin, forming a packet of blood called a "hematoma" [2]

When that happens, smart people usually grab a tube of Hirudoid and apply on the affected area to speed up the recovery. But what is in the Hirudoid and how does it work?

Hirudoid actually contains an active ingredient called Mucopolysaccharide polysulfate [3] or more commonly known as heparinoid [4][5][6][7] which is derived from heparin [7], a strong anticoagulant which prevents blood from clotting or coagulating.

When you apply Hirudoid, the cream is absorbed into the skin, the blood doesn't clot, and the black and blue will then disappear.

So far, can you follow?
hirudo medicinalis
Image from Wikipedia
Now, back to the second picture, the leech. To many people, a leech is a terrible creature that drinks blood, but some leeches, namely the European medical leech hirudo medicinalis, have been used for clinical bloodletting for thousands of years, called hirudotherapy[8].

Ancient Greek painting in a vase, showing a physician (iatros) bleeding a patient
Image from Wikipedia
When a leech is attached to a host and begins to feed, it will secrete an anticoagulating (anti-clotting) enzyme called hirudin into the host's blood stream [8], and because hirudin is even better than heparin in some aspects [9],  leeches are once again welcomed in microsurgery[10].

So, you now understand how Hirudoid and Leeches are similar? And you know why Hirudoid is called Hirudoid?

Something extra for you ladies! See below:

subtle -- (adj)  approving small but important
bruise -- (n) [C]  also called a contusion, is a type of relatively minor hematoma of tissue[1] in which capillaries and sometimes venules are damaged by trauma, allowing blood to seep into the surrounding interstitial tissues. 
hematoma -- (n)[C]  is an extravasation of blood outside the blood vessels, generally the result ofhemorrhage. A hematoma is a pocket or localized collection of blood usually in liquid form within the tissue. 
heparinoid -- (n)[U]  are glycosaminoglycans which are derivatives of heparin.
heparin -- (n)[U] also known as unfractionated heparin, a highly-sulfatedglycosaminoglycan, is widely used as an injectable anticoagulant
anticoagulant -- (n)[C] a substance that prevents coagulation; that is, it stops blood from clotting.
clot -- (vb)[I] forming an almost solid piece of something
coagulate -- (vb)[I or T] to change from liquid to a more solid state, or to cause something to do this
black and blue -- with dark marks on your skin caused by being hit or having an accident
bloodletting -- (c)[U] is the withdrawal of often considerable quantities of blood from a patient to cure or prevent illness and disease.
hirudotherapy -- (n)[C] In medieval and early modern medicine, the medicinal leech (Hirudo medicinalis and its congeners Hirudo verbanaHirudo troctina and Hirudo orientalis) was used to remove blood from a patient as part of a process to "balance" the "humors" that, according to Galen, must be kept in balance in order for the human body to function properly.
microsurgery -- (n) [U] is a general term for surgery requiring an operating microscope.

Hirudin @ Wikipedia

Bruise @ Wikipedia

Hematoma @ Wikipedia


Hirudoid Cream @ netdoctor

Glycosaminoglycan @ Wikipedia

Heparinoid @ Wikipedia

Heparin @ Wikipedia

Anticoagulant @ Wikipedia

Leech @ Wikipedia

Hirudo medicinalis @ Wikipedia

Hirudin @ Wikipedia

Hirudotherapy @ Wikipedia

Microsurgery @ Wikipedia