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. Author manuscript; available in PMC: 2015 May 14.
Published in final edited form as: Muscle Nerve. 2014 Sep 24;50(5):780–784. doi: 10.1002/mus.24226

Figure 1.

Figure 1

Serial sensory nerve action potentials (SNAP) recordings from ulnar and sural nerves in two patients with Guillain-Barré syndrome (GBS). Figure 1A: Patient 1 has normal ulnar and sural sensory recordings at day 3 after symptom onset. Serial nerve conduction studies at day 6 and day 14 revealed a developing “sural nerve sparing pattern” with decreased ulnar SNAP but normal sural SNAP. Figure 1B: Patient 2 had already “sural nerve sparing pattern” with inexcitable ulnar sensory nerve fibers on admittance (day 4 after symptom onset). Repeated electrophysiological testing shows decreasing sural nerve SNAP which became abnormal low at day 10 (dotted line = normal levels).