Chapter 10, routine UE, Facial, Phrenic Nerve Conduction

Question 1

When doing median motor palmar study, palm/wrist CMAP amplitude greater than what implies some conduction block?

Answer 1

1.2

Question 2

When doing median sensory study, palm/wrist SNAP amplitude greater than what implies some conduction block?

Answer 2

1.6

Question 3

When should a phrenic motor study not be performed?

Answer 3

ICU patients with external pacemaker (risk of current spread to heart);
caution with internal jugular catheter, implanted cardiac pacemaker, or ICD

Question 4

When performing facial motor branch study, what branches can be stimulated and what muscles do you record from?

Answer 4

Frontal branch and frontalis;
Zygomatic branch and nasalis;
Mandibular branch and mentalis