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

BMC Neurology

Table 1 Motor Nerve Conduction Studies Before and After Influenza A 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 ms^a	0.24 mV
Right Zygomatic	NP	NP			5.63 ms^a	1.97 mV
Left Mandibular	NP	NP			12.10 ms^a	0.34 mV
Right Mandibular	NP	NP			3.61 ms^a	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

Since the criteria for demyelinating polyneuropathy with conduction blocks were obtained, more proximal nerve segments and other proximal nerves were not studied
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
^aDML normal adult mean values: 3.40 ± 0.80 ms [10]

ISSN: 1471-2377