Neuro Ix

Question 1

When is CT study of choice? how is it usually done?

Answer 1

• acute trauma and haemorrhage
• usually given with contrast to enhance tumours, infections & infarcts

Question 2

how can MRI brain be done?

Answer 2

• T1 weighted images: enhance acute haemorrhage
  
  • only FAT is bright
• T2 weighted images: oedema, infarction, demyelination & chronic haemorrhage
  
  • FAT AND WATER are bright

Question 3

What is EEG and when is it done?

Answer 3

electrical activity of the brain is recorded, important in evaluating epilepsy

Question 4

What are evoked potentials and when is it used?

Answer 4

Nerves are repetitively stimulated and & electrical potentials are measured.

Commonest use is to diagnose MS

Question 5

What are nerve conduction studies?

Answer 5

nerves are stimulated & the electrical activity recorded from different points

Question 6

what is EMG and what is it used for?

Answer 6

• records electrical potentials from needle electrodes in muscle at rest & during contraction
• can differentiate between neuropathic and myopathic disorders

Question 7

what is a LP?

Answer 7

CSF taken via needle inserted into spinal comumn between L3/4 or L4/5