Review Note
Last Update: 04/01/2024 02:30 AM
Current Deck: Neurology::Neuromuscular
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The {{c1::H-reflex}} is the most sensitive test for early GBS. Absent H response, abnormal F wave, and abnormal upper extremity SNAP combined with a normal sural SNAP are characteristic of {{c2::early GBS::condition}}.
Notes
- H-Reflex is equivalent to the deep tendon reflex
- The H-reflex, or Hoffmann's reflex, is a reflex action that is elicited by electrical stimulation of sensory fibers (specifically type Ia afferents) in a mixed nerve. This reflex is used to assess the integrity of the spinal cord and peripheral nerve pathways.
- In a typical H-reflex test, the nerve (commonly the tibial nerve in the ankle) is electrically stimulated, and the resulting electrical activity of the muscles (usually the calf muscles) is recorded. This electrical activity represents the reflex arc that goes from the sensory nerve to the spinal cord and then back out to the muscle via a motor nerve.The H-reflex is not the same as the F-wave or the sensory nerve action potential (SNAP).
- The F-wave is a late response that is elicited by antidromic (opposite to the normal direction) stimulation of the motor nerve, and it reflects the integrity of the entire length of the motor nerve. The SNAP is the electrical response of the sensory nerve to stimulation, and it reflects the integrity of the sensory nerve.
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