TABLE 5.
MEP Findings and Postoperative Muscle Strength of the 66 Upper Extremity Muscles in the 39 patients with Tumors Involving the Cervical Enlargement.
| Muscle strength | |||
|---|---|---|---|
| MEP findings | Worse | Unchanged/improved | Sum |
| No response | 0 | 7 | 7 |
| Negative MEP findings: | |||
| Stable | 3 | 35 | 38 |
| Appeared after initial absence | 0 | 3 | 3 |
| Slight change | 0 | 3 | 3 |
| Temporarily disappeared or declined to <20% baseline amplitude with recovery at the end | 1 | 3 | 4 |
| Subtotal: negative MEP | 4 | 44 | 48 |
| Positive MEP warnings: | |||
| Declined to <20% baseline amplitude | 2 | 1 | 3 |
| Disappeared | 3 | 5 | 8 |
| Subtotal: positive MEP | 5 | 6 | 11 |
Positive Predictive Value was 0.45 (=5/11), and Negative Predictive Value was 0.92 (=44/48)