Exam 4 Lower Extremity

Question 1

While performing a sciatic nerve block with nerve stimulation, you observe foot dorsiflexion. What part of the sciatic nerve are you stimulating?

Answer 1

Common peroneal

Question 2

Which sciatic nerve block(s) will also block the posterior femoral cutaneous nerve of the thigh?

Answer 2

Labat and parasacral
?

Question 3

Which sciatic nerve block will also block the obturator nerve?

Answer 3

Parasacral
?

Question 4

While performing a popliteal nerve block from the lateral approach, you con-
tact the femur. How should you redirect your needle?

Answer 4

Withdraw needle to skin and redirect 30º POSTERIOR/DORSAL to initial insertion plane; the nerve should be 1-1.5 cm deeper than the distance to the femur

Question 5

What muscle contraction should be observed with stimulation of the lumbar
plexus?

Answer 5

Quadriceps (patellar “snap” d/t femoral nerve stimulation)

Question 6

You are having difficulty placing a lumbar plexus block and change to a loss or resistance technique for a psoas compartment block. After you have found the transverse process, what should you do before attaching the loss of resistance syringe?

Answer 6

Remove possible tissue plug by flushing needle with 1 mL

Question 7

What nerve roots does the femoral nerve originate from?

Answer 7

L2-L4

Question 8

Where is the femoral nerve anatomically located in relation to the femoral
artery?

Answer 8

Femoral nerve is lateral to the artery (NAV)

Question 9

In a fascia iliaca block, what two fascial layers cause the two “pops”?

Answer 9

fascia lata (superficial) and fascia iliacus (deep)

Question 10

What is the number one contraindication to performing a nerve block?

Answer 10

Patient refusal

Question 11

While performing a sciatic nerve block with nerve stimulation, you observe foot inversion and plantar flexion. What part of the sciatic nerve are you stimulating?

Answer 11

Tibial nerve