EMG
1. Median >>> ulnar, 2. Peroneal is involved
3. Tibial nerve is almost never involved
4. Pathology is tomaculi
5. ulnar slowing across elbow is 100 %
6. peroneal slowing across knee is 85 %
7. SNAP's are abnormal-- amplitudes always reduced, latencies may be prolonged-- have not only pressure palsies but also an age related neuropathy
Clinical
Unlike CIDP, in which patients are usually symptomatic, HNPP patients often are asymptomatic with EMG changes
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