| Causes | Number | Percentage |
| Unavailability of the OR (Breakdown) | 14 | 60.8 |
| Lack of intensive care beds | 3 | 13 |
| Program overload | 2 | 8.7 |
| Lack of materials | 1 | 4.3 |
| Error in notifying the patient | 1 | 4.3 |
| Unprepared patient | 1 | 4.3 |
| Change of operative indication | 1 | 4.3 |
| Total | 23 | 100 |