This study demonstrated clinically meaningful improvements in pain and physical function up to six months following cRFA. A prognostic genicular nerve block using a local anesthetic volume of 1 mL at each injection site and a threshold of ≥ 50% pain relief for subsequent cRFA eligibility did not improve the rate of treatment success.

This trial showed no significant difference in clinical outcomes with CIESI using a targeted epidural catheter compared to a standard C7-T1 approach for the treatment of unilateral cervical radicular pain at the C5 or C6 level. Both techniques were associated with clinically meaningful improvement across outcome domains of pain, function, disability, and medication use. These effects persisted to 6-month follow-up.The study was registered at Clinical Trials.gov (NCT02095197).

We have synthesized and characterized the new cadmium chelating agent potassium bis(2-hydroxyethyl)aminoethyldithiocarbonate hemihydrate, K[bhexan] x 0.5H2O (2), that is structurally related to the known effective in vivo cadmium chelating agent potassium bis(2-hydroxyethyl)dithiocarbamate, K[bhedtc] (1). The corresponding cadmium complex of 2 differs from di(bis(2-hydroxyethyl)dithiocarbamato)cadmium(II), Cd(bhedtc)2 (3), in that the insoluble compound exhibits an elemental composition consistent with a cadmium:ligand ratio of 2:1. The cytotoxicity of the 1-3 was investigated using the human osteoblast-like cell line, Saos-2. Compounds 1 or 2 did not affect cell adherence or cell viability in the 100-500 microM concentration range studied, whereas 3 resulted in a concentration-dependent increase in loss of cell adherence and decrease in cell viability. Overall, the results of the loss of cell adherence, trypan blue exclusion and MTT assays showed that administration of 3 (cadmium complex of 1) resulted in cytotoxicity lower than that of cadmium chloride, but higher than that of the chelator 1 alone. The effect of simultaneous addition of cadmium chloride and 1 or 2 on cell viability was also assessed using the MTT assay. For the 100 microM cadmium chloride experiments, cell viability comparable to control cells was achieved for both 1 and 2 in the 100-500 microM concentration range studied. Cell viability comparable to control cells was achieved for 1 but not 2 in the 100-500 microM concentration range studied for the 200 microM cadmium chloride experiments. Thus 1 appears more effective than 2 in the ability to mediate the cytotoxic effects of cadmium in vitro upon concomitant administration.

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