Low amplitude dorsal ulnar cutaneous nerve sensory nerve action potential from cross over innervation. Can nerve ultrasound help?
- Author:
Xiaoke Dong
;
Aravinda K Therimadasamy
;
Einar P Wilder-Smith
- Publication Type:Case Reports
- Keywords:
Dorsal Ulnar Cutaneous Nerve;
Nerve conduction study;
sensory nerve action potential;
nerve ultrasound;
nerve fascicle
- From:Neurology Asia
2017;22(1):73-75
- CountryMalaysia
- Language:English
-
Abstract:
The ulnar dorsal aspect of the hand is predominantly innervated by the dorsal ulnar cutaneous nerve
with variable input from the superficial radial cutaneous nerve. This cross innervation can cause
difficulty in interpreting low amplitude sensory nerve action potential for the dorsal ulnar cutaneous
nerve particularly when facing suspected ulnar neuropathyat the elbow. In three subjects with low
dorsal ulnar cutaneous sensory nerve action potential amplitude due to cross over with the superficial
radial nerve, we compared amplitude with nerve circumference and fascicular count as measured by
ultrasound. Dorsal ulnar cutaneous nerve circumference was significantly smaller where there was
low sensory nerve action potential amplitude and showed fewer fascicles. Nerve ultrasonography
may be a useful additional test modality to determine if low dorsal ulnar cutaneous nerve amplitude
is physiological.
- Full text:P020170413343591655972.pdf
