Effect of radiosurgery on hearing assessed by Gardner-Robertson grades
| Before treatment | After treatment | ||||||
|---|---|---|---|---|---|---|---|
| Dosimetry group | Incomplete data | Grade I–II | Grade III–IV | Grade V | Preserved hearing | Deterioration in hearing | Deaf |
| Preserved hearing refers to an unchanged grade before and after treatment. Deterioration is defined as any decline in hearing grade other than becoming completely deaf (grade V). Percentages refer to the proportion of patients with discernible (grade I–IV) hearing before treatment who have preservation of, deterioration in, or no hearing after treatment, with follow up details of when the assessment was made. Dose reduction from group 1 to group 3 was associated with a significant improvement in hearing preservation (p=0.05). | |||||||
| Group 1 (n=13) | 1 | 6 | 3 | 3 | 2 (22%) (52 (6) months) | 1 (11%) (7 months) | 9 (67%) |
| Group 2 (n=17) | 2 | 9 | 1 | 5 | 2 (20%) (74 (101) months) | 6 (60%) (43 (15) months) | 7 (20%) |
| Group 3 (n=92) | 5 | 49 | 12 | 26 | 23 (38%) (40 (25) months) | 26 (42%) (41 (21) months) | 38 (20%) |