Clinical Use of Skull Tap Vestibular Evoked Myogenic Potentials for the Diagnoses of the Cerebellopontine Angle Tumor Patients

Table 1

Auditory and skull tap VEMP head lift results.

Patient	Analyzed parameter	Head lift
		Auditory						Tapping forehead			Tapping mastoids IPSI responses
		AHLB		AR (%)	AHLL	AHLR	AR (%)	FHLB		AR (%)	MHLL	MHLR	AR (%)
		Response from left SCM	Response from right SCM		Response from left SCM	Response from right SCM		Response from left SCM	Response from right SCM		Response from left SCM	Response from right SCM
1	P1 latency (ms)	13.20	13.40		13.40	14.20		13.20	14.40		14.00	14.40
	Corr. amplitude	25.56	9.08	47.59 *	22.96	8.62	45.43 *	36.24	24.59	19.15	33.67	23.97	16.84
2	P1 latency (ms)	14.00	13.60		14.60	NR		14.40	15.20		17.20	15.60
	Corr. amplitude	13.14	5.18	43.49 *	23.51	NR		33.22	8.94	57.60 *	38.19	9.16	61.32 *
3	P1 latency (ms)	12.60	12.80		12.80	13.00		14.00	13.60		14.40	13.20
	Corr. amplitude	10.19	14.14	16.26	19.62	29.40	19.95	44.88	31.72	17.18	58.23	39.40	19.29

AHLB: head lift stimulus delivered to both ears; AHLL: head lift stimulus delivered to the left ear; AHLR: head lift stimulus delivered to the right ear; FHLB: Forehead Head Lift skull tapper located at forehead; MHLL: Mastoid Head Lift skull tapper located at Left; MHLR: Mastoid Head Lift skull tapper located at Right; P1: positive peak; corr. amplitude: corrected amplitude; SCM: sternocleidomastoid muscle; AR: Asymmetry ratio; NR: no response. Abnormal results of corrected asymmetry ratios (AR% > 35%) and no response results (NR) are marked with *.