Hemorrhagic- Subarachnoid

Question 1

What is a subarachnoid haemorrhage

Answer 1

Occurs on the surface of the brain

Question 2

What is the cause

Answer 2

Rupture of an aneurysm

Question 3

What percent of aneurysms form in the circle of willis

Answer 3

85%

Question 4

Name the risk factors

Answer 4

Smoking 
Heavy use of alcohol
Oestrogen deficiency
High blood pressure 
Antocoagulation 
Statin drugs 
Genetic 
Sympathomimetics

Question 5

Why do aneurysms form

Answer 5

Structural weakness in blood vessels

Question 6

Which arteries are particularly susceptible to them

Answer 6

Those carrying high flow I.e those in the circle of willis

Question 7

Lesions 1cm over larger will what?

Answer 7

Grow and rupture

Question 8

What happens when they rupture

Answer 8

Bleeding spreads across the surface of the brain rapidly via csf

Question 9

How long does the bleeding last

Answer 9

A few seconds but re bleeding may occur

Question 10

When does re bleeding usually occur

Answer 10

Within the first 24 hours

Question 11

What is the biggest cause of death or disability after a subarachnoid

Answer 11

Vasospasm

Question 12

What is vasospasm

Answer 12

Extreme narrowing of arteries usually within 3 days of initial rupture

Question 13

Why does vasospasm occur

Answer 13

Chemical irritation of blood vessel walls by breakdown products of hemorrhaged blood

Question 14

What determines the size and depth of subsequent strokes

Answer 14

Duration of vasospasm and location of vessels affected