Adverse effects in 32 patients
| Patient | One week after surgery (32 evaluated) | Six months after surgery (32 evaluated) | 12 months after surgery (19 evaluated) |
| 1 | Dysarthria, reduced consciousness for a few hours, pseudobulbar syndrome | Dysphasia, drooling and postural instability | Drooling and postural instability |
| 2 | During surgery confused, surgery not completed | Intermittent hallucinations / psychosis | Intermittent hallucinations / psychosis |
| 3 | Hiccups | Loss of concentration | Loss of concentration |
| 4 | Urinary incontinence | Urinary incontinence | Urinary incontinence |
| 5 | Facial paresis | Facial paresis, drooling | Facial paresis, drooling |
| 6 | Reduced speech volume | Facial paresis, drooling, fatigue | None |
| 7 | Dysarthria, starting some days after surgery | None | None |
| 8 | Severe headache while supine starting 4 days after surgery, lasting a few days | None | None |
| 9 | Urinary incontinence | None | None |
| 10 | Intracerebral haematoma, evacuated surgically | Hemiparesis, neglect, and severely disabled | |
| 11 | Postural instability for 6 days, dysphasia, facial paresis | Dysphasia (predominantly expressive), impaired coordination while swimming | |
| 12 | Facial paresis, word finding difficulties starting 2 days after surgery | Facial paresis, word finding difficulties | |
| 13+14 | Facial paresis | Facial paresis, drooling | |
| 15 | None | Sexual disinihibition, increased libido | |
| 16 | None | Painful skin while combing | |
| 17 | None | Drooling |