Nerve Conduction Studies A+ GRADED

Nerve Conduction Studies A+ GRADED A-waves - ANS Sometimes called Axon reflex. Seen when using sub-maximal stimulation during the F-wave recording. Consistent in latency and amplitude and usually occurring before the F-wave. Thought to be a result of reinnervation of the nerve. Abduct - ANS Move away from the median plane Abductor Digiti Minimi (ADM or ADQ) - ANS Sometimes called abductor digiti quinti. Ulnar innervated muscle on the medial side of the little finger alongside the 5th metacarpal. The most superficial muscle in the hypothenar eminence. Commonly used when recording ulnar motor studies. Abductor Digiti Quinti Pedis (ADQp) - ANS Lateral plantar, thus tibial nerve, innervated muscle on the lateral side of the foot along side the 5th metatarsal. Abductor Pollicis Brevis (APB) - ANS Median innervated muscle just medial to the 1st metacarpal bone. The most superficial muscle of the thenar eminence. Commonly used when recording median motor studies. Accessory Peroneal Nerve - ANS A branch of the superficial peroneal nerve that partly supplies the extensor digitorum brevis (EDB) in 18-22% of people. The EDB is normally innervated by the deep peroneal. The accessory peroneal nerve is seen when the peroneal amplitude, recording from the EDB, is larger when stimulating at the fibular head than when stimulating at the ankle. It can be confirmed by stimulating behind the lateral malleous, adding that amplitude to the ankle amplitude. The sum of which should closely equal to the amplitude when stimulating at the fibular head. Acetylcholine - ANS The chemical transmitter in a neuromuscular junction. Action Potential - ANS Whenever a stimulus reached or exceeds threshold an action potential is generated propagating along a single axon. Active electode - ANS Synonymous with recording electrode, G1, E1, or Cathode. To complete the circuit a differential amplifier requires the Active electrode and a Reference electrode. Acute Inflammatory Demyelinating Polyneuropathy (AIDP) - ANS Guillain-Barre Syndrome. An acute areflexic ascending sensory-motor polyneuropathy where deficit is maximum in 4 weeks. Characterized by absent or prolonged F-waves, slowed conduction velocities, prolonged latencies, and conduction block (especially proximally). Sensory NCS may be normal in early cases, but as the disease advances low amplitudes and slowed conductions may be seen. Adduct - ANS Move toward the median plane. Age - ANS Affects time and amplitude so normative values reflect different age groups. Afferent - ANS Otherwise known as sensory neurons - carry nerve impulses from receptors or sense organs toward the central nervous system. All or None Response - ANS When depolarization occurs it either causes an all response it reaches threshold, or no response if the depolarization is insufficient to reach threshold. Alternating Current - ANS Current that is forced rapidly back and forth along a circuit, repeatedly reversing its direction.