Page "Arteriovenous malformation" Paragraph 26
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An AVM lacks the dampening effect of capillaries on the blood flow ; it also causes the surrounding area to be deprived of the functions of the capillaries — removal of and delivery of nutrients to the cells.
The resulting tangle of blood vessels, often called a nidus ( Latin for " nest ") has no capillaries and abnormally direct connections between high-pressure arteries and low-pressure veins.
It can be extremely fragile and prone to bleeding.
The resultant sign, audible via stethoscope, is a rhythmic, whooshing sound caused by excessively rapid blood flow through the arteries and veins.
It has been given the term " bruit ", French for noise.
On some occasions a patient with a brain AVM may become aware of the noise, which can compromise hearing and interfere with sleep in addition to causing psychological distress.
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