Table 2:

A summary of articles on the relationship between NILH with VD in subjects exposed to impulsive noise (n=5)

Ref. No.	Study Aim	Population Covered	Audiological/Vestibular Examinations	The results showed:	QAS
(20)	Examination of the possible changes in the vestibular system function in subjects with NIHL.	22 navy crews with NIHL(≥25 dB in at least one ear)/21 controls with normal hearing.	PTA/ENG	A significant reduction in VOR gain and caloric responses in the NIHL group. No significant differences in vertigo symptoms, oculomotor tests, directional preponderance between groups.	7/8
(54)	Evaluation of the vestibular system function in subjects with symmetrical and asymmetrical NIHL and exposed to impulse and impact noise.	258 military personnel with NIHL; in 2 groups (134 with symmetrical and 124 with asymmetrical NIHL) and 2 subgroups (presence or absence of vestibular complaints)/32 healthy men (aged-matched without exposure)	PTA/ENG	A significant abnormal vestibular finding in subjects with asymmetrical (46.8%) than symmetrical (5.2%) NIHL. A strong correlation between the vestibular symptoms (dizziness or vertigo) and abnormal ENG findings in subjects with asymmetrical NIHL. A significant correlation between the subjects’ symptoms (80.7%) in the group with asymmetrical NIHL and the ENG abnormal findings.	7/8
(55)	Investigation of the effect of impulsive noise exposure on cochlear and saccular function	12 police officers/12 age-matched healthy men.	PTA/cVEMP	A significant hearing deterioration in the police officers (only at 4 and 6 kHz in the left ear) over the 10-year study period compared with healthy controls. A significant abnormal cVEMP responses (75%) in police officers. No symptoms of vertigo or imbalance in police officers.	7/8
(56)	Investigation of the effects of noise exposure on the cVEMP in individuals with asymmetric NIHL	43 subjects with military noise exposure and asymmetric NIHL/14 age-matched controls with normal hearing.	PTA/cVEMP	A significant abnormal cVEMPs (33%) in NIHL subjects. Dizziness is compliant in 49% of NIHL subjects. A significant relationship between the abnormal cVEMPs and the degree of NIHL.	7/8
(57)	Analysis of the cVEMP results of patients with NIHL.	20 military personnel with symmetrical NIHL (at 4, 6 and 8 kHz); in two groups; group 1; NIHL > 68.3 dB and group 2; NIHL<68.3 dB).	PTA/cVEMP	A significant abnormal cVEMP in-group 2 than group 1 (63% versus 28%). No significant difference in the prevalence of vertigo and dizziness symptoms between the groups. A significant higher abnormal cVEMP in subjects with vertigo/dizziness and lower NIHL.	6/8