Sensitivity was 20 μV/division, low-frequency filter was 20 Hz, high-frequency filter was 5 kHz, sweep speed was 1 ms/division, duration of pulse was 0.1 ms, and the machine used was a Medelec Synergy electromyograph. Rate of pulse was not specified.
This study was performed in the supine position, with the hands placed with the wrist in a neutral position and the digits relaxed.
Following the orthodromic method [
1], the sensory nerve action potentials (SNAPs) were recorded using disk electrodes placed on the midpalm and the wrist. On the midpalm (R1), the active electrode (A) was placed 7 cm from the stimulating cathode (secured around the proximal phalanx of the index or middle finger in the case of digit II or digit III stimulation, respectively), while at the wrist (R2), the active electrode (A) was placed 14 cm from the stimulating cathode (secured around the proximal phalanx of the index or middle finger in the case of digit II or digit III...
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Pyun SB, Song W, Yoo SD (2005) Slowed conduction velocity of the median sensory nerve across the carpal tunnel in normal adults. Am J Phys Med Rehabil 84:598–603PubMedCrossRefGoogle Scholar
Padua L, Lo Monaco M, Valente EM et al (1996) A useful electrophysiologic parameter for diagnosis of carpal tunnel syndrome. Muscle Nerve 19:48–53PubMedCrossRefGoogle Scholar
Sheu JJ, Yuan RY, Chiou HY et al (2006) Segmental study of the median nerve versus comparative tests in the diagnosis of mild carpal tunnel syndrome. Clin Neurophysiol 117:1249–1255PubMedCrossRefGoogle Scholar
Gazioglu S, Boz C, Altunayoglu Cakmak A (2011) Electrodiagnosis of carpal tunnel syndrome in patients with diabetic polyneuropathy. Clin Neurophysiol 122:1463–1469PubMedCrossRefGoogle Scholar
Stalberg E, Stalberg S, Karlsson L (2000) Automatic carpal tunnel syndrome tester. Clin Neurophysiol 111:826–832PubMedCrossRefGoogle Scholar