Distal Motor Latency

Distal Motor Latency. Distal Latency Defined as the time from the stimulus affecting the nerve to the response (motor or sensory) being recorded latency is usually measured in milliseconds (msec) Distal latency is that interval measured from the stimulation of the distalmost accessible site on the nerve.

distal motor latency is prolonged but is not as sensitive an indicator as sensory latency motor latency abnormalities tend to occur later in course of dz EMG may show loss of motor units & presence of denervation potentials in the thenar muscles although these abnormalities are present before clinically evident muscular atrophy.

Nerve conduction studies: essentials and pitfalls in

However with increasing motor axon loss some of the largest fastest conducting fibres will be lost Therefore distal motor latency may be slightly prolonged (< 120% of normal limit) and conduction velocity slightly slowed (> 80% of normal limit) The dynamics and timing of an axonal insult can affect the abnormalities seen.

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Residual latency (mRL) was calculated as follows mRL = Distal motor latency − (distal nerve conduction distance (80 mm)/proximal MCV) A value of >255 is considered as abnormal The difference of the minimal Fwave latencies between median and ulnar nerves (FdifMU) was calculated as follows FdifMU = Minimal Fwave latency of median nerve (minimum mFWL) −.

Distal Motor (M) Latency, Fwave Latency, and M/F Ratio …

Sidetoside and proximaltodistal differences were analyzed The normal range was derived as mean +/ 2 standard deviations (SD) and at the 97th (third) percentiles of observed values Mean onset latency was 45 ms (SD 08).