Normative data of F-wave measures in China

F‐wave latencies in patients with diabetes mellitus

“…Each patient had sensory nerve conduction studies, orthodromic for the median, ulnar, medial plantar, and superficial fibular nerves and antidromic for the sural nerve, and motor nerve conduction studies for the median, ulnar, tibial, and fibular nerves. All studies were performed with surface recordings using conventional techniques . The nerves were stimulated using 0.1 ms electrical pulses with supramaximal intensity defined as a stimulus 20% greater than a stimulus that was just sufficient to elicit maximum amplitude compound muscle action potentials (CMAP) or sensory nerve action potentials (SNAP).…”

“…These normative data, which are used widely in China, correspond closely to values reported in the United States . F‐wave latencies were compared with height‐latency nomograms published earlier based on measures on the right side in a group of healthy Chinese volunteers . Although the study was conducted bilaterally, only data from the right side were used to match our reference values which depict the upper limit of F‐wave latency as the mean plus 2 standard deviations (SD).…”

“…Although the study was conducted bilaterally, only data from the right side were used to match our reference values which depict the upper limit of F‐wave latency as the mean plus 2 standard deviations (SD). We inferred the upper limit of the minimum F‐wave latency using the formula of the regression line for a given height of a subject . Chi‐square test was used for comparing the percentages.…”

Proximally evoked soleus H-reflex to S1 nerve root stimulation in sensory neuronopathies (ganglionopathies)

“…The shortest latencies of tibial F-waves were within the normal range in both groups of patients. 10…”

Sphincter electromyography in diabetes mellitus and multiple system atrophy

“…Electrophysiologic tests were conducted in a warm room with the subject maintaining the temperature above 32°C. We used a Medtronic Keypoint EMG system with the filter width of 20 Hz–10 KHz, amplifier setting at 2 mV/div for motor, 20 µV/div for sensory studies and sweep speed at 5 ms/div . The protocol included: (1) Sensory NCS, orthodromic for median, ulnar, medial plantar and superficial fibular nerves, and antidromic for sural nerve; and (2) Motor NCS of median, ulnar, tibial and fibular nerves, including F wave studies for median and tibial nerves, all bilaterally.…”