Isolated Bilateral Ptosis as an Early Sign of Guillain-Barré Syndrome

Table 1

Nerve conduction study (motor).

Nerve	Latency (ms)		Amplitude (mV)		Conduction velocity (m/s)
	Right	Left	Right	Left	Right	Left
Median
Position 1	3.4	3.5	10.7	11.0
Position 2	8.1	7.9	7.6	7.3
Position 3	9.5	9.7	7.1	7.1	42.6	54.5
Position 4	14.2	—	0.8	—
Ulnar
Position 1	3.2	3.4	11.6	12.0
Position 2	7.1	7.2	8.5	12.0
Position 3	8.9	9.7	6.0	—	58.8	47.4
Position 4	10.6	—	4.9	—
Tibial
Position 1	5.7	5.6	1.8	3.4
Position 2	17.4	15.0	1.2	2.0	29.9	38.3
Peroneal
Position 1	5.3	5.1	3.0	4.7
Position 2	14.2	13.8	3.1	3.5	36.0	37.9