Abstract

Contrast Spread Technique (CST) [1, 2, and 3] is a new and evolving method for epidural space recognition. It is based on the interpretation of the radiological images and possesses some theoretical and practical advantages over the conventional loss of resistance (LOR) technique. Unlike the LOR technique, which relies on the subjective feeling of the performing physician, the CST technique allows for objective verification of the needle tip location inside or outside of the epidural space by visual assessment of the contrast spread that may also be observed and interpreted by the third party. Also, by emphasizing the analysis of resulted radiological images instead of relying on the tactile sense of resistance, it may improve the accuracy of the needle placement and enhance the safety of the epidural injections by preventing dural penetration.