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Table 1 Motor Nerve Conduction Studies Before and After Influenza A Infection

From: Hyperacute relapse of Lewis-Sumner syndrome during influenza A (H1N1) virus infection

  Before H1N1 infection After H1N1 infection (after 9 days)
Nerve DML AMP CV Δ AMP DML AMP CV Δ AMP
Left Zygomatic NP NP    12.80 msa 0.24 mV   
Right Zygomatic NP NP    5.63 msa 1.97 mV   
Left Mandibular NP NP    12.10 msa 0.34 mV   
Right Mandibular NP NP    3.61 msa 2.10 mV   
Left Median Motor Nerve
 Wrist-APB 3.10 ms 2.4 mV    3.42 ms 1.87 mV   
 Antecubital fossa-Wrist 14.2 ms 0.56 mV 21.6 m/s −76.7% 13.90 ms 0.58 mV 21.9 m/s −69.0%
Right Median Motor Nerve
 Wrist-ABP 2.9 ms 9.2 mV    2.73 ms 9.5 mV   
 Antecubital fossa-Wrist 9.5 ms 4.2 mV 37.1 m/s −54.3% 8.44 ms 6.1 mV 42.0 m/s −35.8%
Left Ulnar Motor Nerve
 Wrist-ADM 2.03 ms 11.1 mV    2.72 ms 12.4 mV   
 Bellow elbow-Wrist 8.25 ms 3.8 mV 37.0 m/s − 65.8% 9.02 ms 4.9 mV 36.5 m/s − 60.5%
 Above elbow-Bellow elbow 10.9 ms 3.2 mV 54.7 m/s −15.8% 11.00 ms 4.8 mV 50.5 m/s −2.0%
Right Ulnar Motor Nerve
 Wrist-ADM 2.20 ms 15.1 mV    2.00 ms 13.5 mV   
 Bellow elbow-Wrist 8.20 ms 9.2 mV 64.5 m/s −39.1% 5.85 ms 11.0 mV 58.4 m/s −18.5%
 Above elbow-Bellow elbow 6.0 ms 9.0 mV 59.1 m/s −2.2% 7.69 ms 10.8 mV 55.4 m/s −1.8%
Left Tibial Motor Nerve
 Ankle-AH 3.78 ms 17.2 mV    3.97 ms 16.2 mV   
 Popliteal Fossa-Ankle 11.4 ms 9.1 mV 51.8 m/s −47.1% 11.80 ms 10.0 mV 47.3 m/s −38.3%
Right Tibial Motor Nerve
 Ankle-AH 4.62 ms 8.3 mV    5.89 ms 11.5 mV   
 Popliteal Fossa-Ankle 14.2 ms 3.8 mV 40.7 m/s −54.2% 14.90 ms 4.2 mV 43.3 m/s −63.5%
Left Deep Peroneal Motor Nerve
 Ankle-EDB 3.82 ms 0.41 mV    6.52 ms 0.91 mV   
Right Deep Peroneal Motor Nerve
 Ankle-EDB 0.00 ms 0.00 mV    0.00 ms 0.00 mV   
  1. Since the criteria for demyelinating polyneuropathy with conduction blocks were obtained, more proximal nerve segments and other proximal nerves were not studied
  2. APB Abductor pollicis brevis, ADM Abductor digiti minimi, AH Abductor hallucis, AMP Amplitude, CV Conduction velocity, DML Distal motor latency, EDB Extensor digitorum brevis, ms Milisecond, mV Millivolt, NP Not performed
  3. aDML normal adult mean values: 3.40 ± 0.80 ms [10]