Single center experience on the rate of discontinuation and safety of cervical transforaminal epidural steroid injections using the modified approach in an office setting without sedation.

Background: Cervical transforaminal epidural steroid injections (CTFESI) are commonly used in the treatment of upper extremity radicular pain. Recently, a modification of the conventional technique has been developed and validated which has a theoretical safety advantage of less risk of needle contact of the spinal nerve and vertebral artery. The new approach involves a needle trajectory under fluoroscopic guidance which is directly based upon the specific superior articular process angle measurement on MRI.

Objective: The purpose of this study was to evaluate the discontinuation rate of the modified approach CTFESI procedure in a non-sedated patient population. The study was also undertaken to confirm the safety of the procedure in an office-based setting.

Methods: A retrospective review was performed of the authors' (DL, SH) practice to identify all CTFESI using the modified approach, performed between October 2018 through January 2021 through a query of the investigators' (DL and SH) electronic medical record system. Any discontinued CTFESI procedure was identified. The reason for discontinuation was determined through medical record review. In addition, any significant neurologic or cardiovascular event occurring during or immediately following any completed or discontinued CTFESI was identified. Mild vasovagal reaction was not considered a significant complication.

Results: A total of 973 CTFESI procedures were performed using the modified approach during the study period. Twelve procedures, 1.2% (95% CI 0.7-2.1%) were discontinued. Nine were aborted due to vascular flow not resolved with needle repositioning. Only three, 0.3% (95% CI 0.1-0.9) were aborted due to patient intolerance. There were zero significant neurologic or cardiovascular complications.

Conclusion: The performance of the modified approach CTFESI appears to be well tolerated with a very low rate, 0.3%, of discontinuation due to intolerance in non-sedated patients. The zero incidence of neurologic or cardiovascular complication contributes to the current literature on the safety of this procedure.