Pre- and postprocedural pain level assessmenta
| No. of Patients | |
|---|---|
| Primary outcomes | |
| >50% pain relief at 15 min | 185 (75.2%) |
| <50% pain relief at 15 min | 61 (24.8%) |
| >50% pain reduction from baseline at 2 wk | 165 (67.1%) |
| <50% pain reduction from baseline at 2 wk | 81 (32.9%) |
| No preprocedural pain (patient-reported numbness or paresthesia) | 8 (3.1%) |
| Alleviation of preprocedural numbness or paresthesia at 2 wk | 7 of 8 (87.5%) |
| Minor adverse reactions or events | |
| Vasovagal reaction | 3 (1.2%) |
| Transient pseudo-Horner syndrome (sympathetic blockade) | 1 (0.4%) |
| New onset of diffuse headache | 2 (0.8%) |
| Increase in usual pain in a familiar distribution | 8 (3.1%) |
↵a Transient arm numbness postinjection was not included as an untoward effect because it is expected when exposing cervical nerve roots to a lidocaine containing mixture.