Abstract
DEAR EDITOR: I find the article Predicting Nerve-Root Pathology with VsNCT (ISSN 1092 406X in the 2002 issue (Vol 6 #1), authored by Randall Cork, MD, PhD, et. al., to be particularly interesting. However, I would like clarification on a few points: QUESTIONS Question 1. In the examples I can see that sufficient dye was injected so as to visualize the all the lower nerve roots. What volume was required to achieve this? Question 2. The patient selection criteria is not clear. It isn't mentioned. Also, can I assume the examiners were blinded to other findings? Question 3. The correlation between the graphs and films seems to be that the highest intensity (rating) correlates with the nerve root with restricted dye flow. Does this mean the analysis uses the patient his own control, so the highest intensity threshold is the significant finding? Is it true then that since there is no population data given for normal subjects, can I assume the V-sNCT results are independent of age, gender and population averages? Question 4. What interventions were employed, and is there available data on the results of intervention; i.e. were followed up epidurograms and V-sNCT exams performed?
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