Frequency of intravascular injection by anatomic zonea
| Injection Type | Anatomic Zone of Identified Vessel | No. of Injections | |||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 0 | ||
| Lumbar ILESI | 25% | 100% | 25% | 0% | 0% | 0% | 4 |
| Lumbar TFESI | 14% | 18% | 86% | 5% | 36% | 0% | 22 |
| Cervical ILESI | 0% | 100% | 50% | 0% | 50% | 0% | 4 |
| Cervical TFESI | 29% | 0% | 71% | 0% | 14% | 14% | 7 |
↵a Percentages across each injection type may sum to >100% because vessels may be visualized in >1 location simultaneously.