A Woman With Neck and Arm Pain





A 41-year-old woman came with a 10-month history of neck pain radiating to the right arm.


Neurologic examination showed normal mentation and cranial nerves. There was no weakness, but there was diminished brachioradialis reflex on the right compared with the left. Sensory examination was normal. The rest of the examination was also normal. She was referred for an EMG.


An EMG Test was Performed




Motor Nerve Studies
























Nerve and Site Latency (ms) Amplitude (mV) Conduction Velocity (m/s)
Median Nerve R. Normal ≤ 4.2 Normal ≥ 6 Normal ≥ 50
Wrist 3.6 13 –
Elbow 7.3 12 59



















Ulnar Nerve R. Normal ≤ 3.6 Normal ≥ 8 Normal ≥ 50
Wrist 2.8 18 –
Below elbow 6.0 16 61




F-Wave Studies
















Nerve Latency (ms) Normal Latency ≤ (ms)
Median nerve R. 23.4 30
Ulnar nerve R. 25.2 30




Sensory Nerve Studies


































Nerve Onset Latency (ms) Normal Onset Latency ≤ (ms) Peak Latency (ms) Normal Peak Latency ≤ (ms) Amp (μV) Normal Amp ≥ (μV) Conduction Velocity (m/s) Normal Conduction Velocity ≥ (m/s)
Median nerve R. 2.5 2.6 3.0 3.1 34 20 52 50
Ulnar nerve R. 2.1 2.6 2.6 3.1 33 13 57 50

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Mar 25, 2024 | Posted by in NEUROLOGY | Comments Off on A Woman With Neck and Arm Pain

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