Table 1.

The electrodiagnostic testing results

Variable		Electrodiagnostic testing
		6 Months	12 Months	18 Months
Sensory nerve conduction study
Right	Latency (ms)	2.4	2.4	2.8
	Amplitude (mV)	20.9	27.3	34.6
Left	Latency (ms)	2.7	2.5	3.0
	Amplitude (mV)	3.4	10.2	18.0
	Recovery rate (%)	16.3	37.4	52.0
Infraorbital blink reflex
R1 Ipsilateral	Right (ms)	3.0	4.7	4.4
	Left (ms)	Not evoked	6.7	5.1
R2 Ipsilateral	Right (ms)	23.4	18.3	13.5
	Left (ms)	Not evoked	28.9	14.2
R2 Contralateral	Right (ms)	36.5	28.8	39.2
	Left (ms)	Not evoked	30.4	35.7
Electromyography
Left frontalis	Spontaneous activity	Normal	Normal	Normal
	MUAPs	Normal, discrete	Normal, discrete	Normal, discrete
Left nasalis	Spontaneous activity	Positive sharp wave	Positive sharp wave, fibrillation	Normal
	MUAPs	Normal, discrete	Polyphasic, discrete	Normal, discrete
Left orbicularis oris	Spontaneous activity	Normal	Normal	Normal
	MUAPs	Polyphasic, discrete	Normal, discrete	Normal, discrete
Motor nerve conduction study
Right nasalis	Latency (ms)	2.6	2.6	2.5
	Amplitude (mV)	3.2	5.5	5.5
Left nasalis	Latency (ms)	2.8	3.1	2.6
	Amplitude (mV)	1.1	2.6	3.5
	Recovery rate (%)	34.3	47.2	63.3

Axonal degeneration in the left trigeminal nerve was diagnosed by a decrease in amplitude in the sensory nerve conduction study, lesions in the infraorbital nerve and left facial nerve were diagnosed by left ipsilateral R1, R2 and contralateral R2 and right contralateral R2 delays observed in the infraorbital blink reflex test, and neuropathy of the buccal branch of the left facial nerve was diagnosed by discrete polyphasic motor unit action potentials (MUAPs) and abnormal spontaneous activity in the left nasalis and orbicularis oris observed using electromyography. Additionally, gradual nerve function recovery is demonstrated by improvements in these test results. The nerve conduction study showed a 52.0% recovery of infraorbital neuropathy and 63.6% recovery of facial neuropathy in 18 months.