Median motor nerve conduction studies and median orthodromic sensory studies are two nerve conduction studies worth examining, according to the Journal of Neurology, Neurosurgery & Psychiatry. Both studies record nerve response to supramaximal electrical stimulation but in varying ways.Continue Reading
Neurologists perform median motor nerve conduction studies by placing an active recording electrode over the abductor pollicis brevis muscle in the hand, explains the Journal of Neurology, Neurosurgery & Psychiatry. Electric stimulation takes place at the elbow, wrist, brachial plexus and axilla, with motor responses from each site recorded and compared. The processed result is called the compound muscle action potential.
Neurologists perform median orthodromic sensory studies by placing a stimulating electrode on the index finger and recording the nerve response at the wrist, says the Journal of Neurology, Neurosurgery & Psychiatry. This is a form of sensory nerve action potential study, a type of study that electrically stimulates a sensory fiber and records the resulting nerve action potential at some point further along the same nerve.
Orthodromic sensory studies are different than antidromic testing studies by the direction of physiological sensory conduction, the Journal of Neurology, Neurosurgery & Psychiatry mentions. There is no standard between orthodromic sensory studies and antidromic ones; different laboratories prefer different types of nerve conduction studies for mapping action potentials of certain nerves.Learn more about Diagnostics & Imaging