Table 1.

Five electrophysiological criteria for the diagnosis of childhood Guillain Barre Syndrome

Parameters	Ho et al.	Hadden et al.	Dutch et al.	Hughes et al.	Rajabally et al.
AIDP
MCV	<90% LLN	<90% LLN	<70% LLN	<90% LLN	<70% LLN
	<85% if D-amp <50%	<85% if d-amp <50%	<85% if d-amp <50%
DL	>110% ULN	>110% ULN	>150% ULN	>110% ULN	>150% ULN
	>120% if D amp <LLN	>120% if d-amp <LLN		>120% if d-amp <LLN
TD	Unequivocal	Not considered	D-P duration ratio >150% ULN		Not considered
			D duration >300% ULN
CB	Not considered	P-D amp ratio < 0.5 D amp > 20% LLN	Not considered	P-D amp ratio < 0.5 D amp > 20% LLN	<0.7 P-D amp ratio in two nerves with an additional parameter
D CMAP				>10% LLN
F wave L	>120% ULN	>120% ULN	>150% ULN	>120% ULN	>120% ULN
					>150% ULN if distal CMAP <50% LLN
					Absent in two nerves with dCMAP >20% LLN with an additional parameter
AMAN
	No AIDP	No AIDP	Not considered	No AIDP	No AIDP
CMAP	D amp <80 % LLN	D amp <80 % LLN	Normal SNAP	D amp <80 % LLN
					P-D amp ratio < 0.7
AMSAN
	Not considered	Not considered	Not considered	No AIDP	Not considered
				SNAP < LLN
Inexcitable
	Not considered	Absent D CMAP in all nerves	Not considered	Absent D CMAP in all nerves	Absent D CMAP in all nerves
		Present in only one nerve with <10% LLN		Present in only one nerve with <10% LLN	Present in only one nerve with <10%LLN
Equivocal
	Not considered	Not fitting criteria	Not considered	Not considered	Not fitting criteria

AIDP Acute Inflammatory Demyelinating Polyneuropathy. MCV Mean Conduction Velocity, DL Distal Latency. TD Temporal Dispersion, CB Conduction Block, SNAP Sensory Nerve Action Potential, LLN Lower Limit Normal, ULN Upper Limit Normal