Table 2. Comparison of surgical findings and outcomes between the mild- and severe-spasm groups.
| Variables | Mild-spasm (n=327) | Severe-spasm (n=309) | p |
|---|---|---|---|
| Offending vessel | 0.066 | ||
| AICA | 188 (57.5) | 168 (54.4) | |
| PICA | 99 (30.3) | 85 (27.5) | |
| VA | 10 (3.1) | 10 (3.2) | |
| AICA+PICA | 7 (2.1) | 13 (4.2) | |
| AICA+VA | 9 (2.8) | 24 (7.8) | |
| PICA+VA | 8 (2.4) | 7 (2.3) | |
| AICA+PICA+VA | 5 (1.5) | 2 (0.6) | |
| Artery+vein | 1 (0.3) | 0 (0) | |
| Vein | 0 (0) | 0 (0) | |
| Single/multiple offending vessels | 296/31 (90.5/9.5) | 263/46 (85.1/14.9) | 0.039* |
| Indentation grade | 1.9±0.8 | 2.4±0.7 | <0.001* |
| Surgical outcome | |||
| Successful/unsuccessful | 281/43 (85.9/13.1) | 263/46 (85.1/14.9) | 0.568 |
| SMC grade at 6 months after MVD | 0.2±0.5 | 0.4±1.0 | 0.248 |
| Complications | |||
| Delayed facial palsy | 17 (5.2) | 32 (10.4) | 0.017* |
| Hearing loss | 7 (2.1) | 9 (2.9) | 0.617 |
| Ear effusion | 7 (2.1) | 6 (1.9) | 1.000 |
| Tinnitus | 5 (1.5) | 2 (0.6) | 0.452 |
| Surgery-related | 4 (1.2) | 5 (1.6) | 0.746 |
| Other | 10 (3.1) | 9 (2.9) | 1.000 |
Data are n (%) or mean±standard-deviation values.
*p<0.05.
AICA: anterior inferior cerebellar artery, MVD: microvascular decompression, PICA: posterior inferior cerebellar artery, VA: vertebral artery.