Objective.

To establish the relationship between the immediate symptom reduction of post-lumbar nerve block guided by Computed Tomography (CT) and the improvement after a period of one month.

Materials and methods.

Data from 46 patients who performed lumbar, foraminal and epidural CT-guided blocks were analyzed, performed from December 2018 to March 2019. The patients signed a written informed consent and our institutional Ethical Committee approved the study. By means of a dichotomous questionnaire, information was collected about the initial symptoms, the immediate changes after the procedure and the presence of symptoms one month later.

Results.

Immediately after blockade, 30 patients (65%) showed improvement or absence of symptoms six of them manifested persistence of symptoms after a month. Immediately after the procedure, 16 (34%) patients did not present any change in the symptomatology. Seven of them showed improvement after a month. Odds ratio for persistence of analgesic effect after a month when the patient had manifested immediate relief after procedure was 5.1 (95% IC 1.128-24.031). Nevertheless, exact Mc Nemar’s test to establish statistically significant difference in patients with immediate relief and those with persistence of it after a month showed a p value of 0.08.

Conclusion.

There was a positive association between immediate and midterm symptom relief, however before and after statistical analysis hints that this results may have been given by chance.