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Sensory Conduction Changes



- See: Motor Conduction Latency:

- Sensory Amplitude:
    - among the earliest changes in a nerve compression sydrome is changes in distal sensory amplitude, followed by an increase in distal 
          sensory latency;

- Sensory Conduction Latency:
    - more sensitive than is motor conduction velocity;
    - amplitude of action potentials also indicates alteration of participating motor nerve axons;
    - most electromyographers consider the following results abnormal (with control for the patient's age and limb temperature):
          - an absolute sensory latency of more than 3.7 msec
          - difference of 0.4 msec or more between values obtained for median nerve and those obtained for the radial or ulnar nerve



[The value of sensory latency measured on the four median innervated fingers for the diagnosis of the carpal tunnel syndrome.]



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