Anesthesia Medical News about Injections, Epidural Steroids

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Pharmacology of steroids used during epidural steroid injections
Techniques in Regional Anesthesia and Pain Management, 11/20/09

Kushnerik V et al. – The most commonly used steroid preparations for the neuraxial blockade are methylprednisolone acetate (Depo–Medrol, Pfizer, New York, NY), triamcinolone acetonide and diacetate (Kenalog, Bristol–Myers Squibb, Princeton, NJ), betamethasone acetate (Celestone, Schering–Plough Corporation, Kenilworth, NJ), and dexamethasone (Decadron, Merch & Company Inc, West Point, PA). Glucocorticoids are postulated to improve immunologic activity and wound healing. They are also required to maintain normal carbohydrate, lipid, and protein metabolism. The formulations available for injectable steroids contain various chemicals, which include buffers, polyethylene glycol, benzyl alcohol, and benzalkonium chloride. Toxicities that are associated with epidural steroid injections (ESIs) are often delayed. There have been several cases that reported injury to the central nervous system following transforaminal ESIs. The most accepted explanation for this is an occlusion of the segmental artery by the steroid particulate matter or embolization through the vertebral artery.

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