PBL questions

Question 1

Deep fibular nerve supply

Answer 1

1. Ankle dorsiflexion
2. Toe extension
   Sensation to first dorsal webspace

Question 2

Superficial fibular nerve supply

Answer 2

1. Ankle eversion

Sensation to dorsum of foot

Question 3

If you have sensory loss up to lateral knee - what type of lesion would it be?

Answer 3

CANNOT be PERONEAL - lateral cutaneous branch comes off proximal to fibular head

Question 4

A common perineal nerve lesion suggests problems with… 2 things

Answer 4

1. Ankle dorsiflexion

2. Ankle eversion

Question 5

How can you rule out a common peroneal nerve lesion?

Answer 5

1. Check involvement of L5 - Ankle inversion

2. Superior gluteal nerve - hip abduction

Question 6

How do you distinguish between an Acute infarct and acute hemorrhage?

Answer 6

1. If there are signs of increased ICP - mass effect, headache nausea, vomiting - then it’s HEMORRHAGE
2. CT scan shows blood

Question 7

3 white things on a CT

Answer 7

1. Blood
2. Calcified tissue
3. contrast

Question 8

Most strokes, are they embolic or thrombotic?

Answer 8

EMBOLIC

Question 9

If you see a large wedge of infarct - think

Answer 9

LARGE artery cardioembolic

Question 10

If you see a small infarct

Answer 10

think SMALL striate deep lacunar

Question 11

Describe ischemic thresholds - first thing that drops when you have an ischemic stroke

Answer 11

1. First is SYNAPTIC failure (energy-dependent, acute and reversible - TIA)
2. if perfusion pressure drops further, reach MEMBRANE failure - cytotoxic edema - dying cell
3. INFARCTION

Question 12

How does NA-1 work for stroke?

Answer 12

targets a scaffolding protein - prevents NO from leading to cell death