Table 2.
Comparison of the reviewed reports that investigated the discrepancy of caloric and vHIT results in MD.
| MD diagnosis and duration | N | Normative values (caloric) | Normative values (vHIT) | N (%) CV | Moment of evaluation | References |
|---|---|---|---|---|---|---|
| Definite MDa Mean duration: N/A |
3 | Abnormal: unilateral weakness (UW) >22% and directional preponderance (DP) >28% | Abnormal: VOR gain <0.7 and/or saccades | 3 (100%) | No indication of patients' state (ictal or outside the ictal phase) during vestibular assessment nor MD stages | (22) |
| Definite MDb Mean duration: 3 years |
32 | Abnormal: sum of slow phase velocity (SPV) of one ear (cold and warm) <5°/s (unilateral) or sum of SPV (cold and warm) of both ears <12°/s (bilateral) |
Abnormal: presence of saccades and/or VOR gain <0.8 for lateral SCCs VOR gain <0.75 for vertical SCCs |
17 (43.6%) | Outside the ictal phase: at least 72 h after MD crisis | (23) |
| Definite MDb Mean duration: 7 years |
37 | Abnormal: UW ≥20% | Abnormal: presence of saccades or VOR <0.78 for lateral SCCs VOR <0.64 for vertical SCCs |
Total: 34 (91.9%) Patients outside MD crisis: 31 (94%) Patients just after MD crisis: 3 (75%) |
Outside the ictal phase: 33 patients Just after an MD crisis (irritative/recovery phase): 4 patients |
(24) |
| Definite MDa Mean duration: 5 ± 6.2 years |
87 | Abnormal: vestibular preponderance >22% or DP >28% or Irrigation response Vmax <15°/s |
Abnormal: VOR gain <0.8 and saccades | 132 ears (86.8%) | Outside the ictal phase | (25) |
| Definite MDa Mean duration: 3 ± 2.3 years |
88 | Abnormal: UW >20% and DP >28% | Abnormal: VOR gain <0.8 for lateral SCCs VOR gain <0.7 for vertical SCCs and saccades |
Lateral canal: 40 (45.6%) All 6 canals: 16 (18.2%) |
Outside the ictal phase | (26) |
| Definite MDb Mean duration: N/A |
73 | Abnormal: UW ≥30% or Bilateral slow phase velocity responses were ≤ 10°/s |
Abnormal if VOR <0.8 | 27 (37.0%) | Outside the ictal phase | (27) |
| MD classification not indicatedb Mean duration: N/A |
20 (15 unilateral, 5 bilateral; total: 25 ears) |
Abnormal: ENG response ≤ 10°/s. | Abnormal: VOR gain <0.8 for lateral SCCs or VOR gain <0.8 and saccades |
14/25 ears (56%) 14/20 MD patients (70%) |
No indication of patients' state (during or after crisis) during vestibular assessment | (28) |
| Definite MDa Mean duration: N/A |
51 | Abnormal: UW >25% |
Abnormal: VOR gain <0.8 for lateral SCCs VOR <0.7 for vertical SCCs or Presence of overt and covert saccades for >50% of trials |
Active: 16 (40%) Inactive: 6 (54.6%) |
Shea classification of MD: Active (symptoms within the past 3 months): 40 Inactive (symptom free for at least 3 months): 11 |
(29) |
a
American Academy of Otolaryngology—Head and Neck surgery criteria (1995) (AAO-HNS).
b
Bárány Society criteria (2015).