Epidural Steroid Injections Could Cause More Harm Than Good

For many with chronic back pain, epidural injections are the only reliable source of relief.  However, a recently published study suggests that consistent administrations of steroid could result in more harm than good.  In the following article, Dr. Michael Omidi discusses the study, as well as the possible complications that could arise from the steroid treatments.

The recent fungal meningitis outbreak was caused by a tainted batch of injectable steroids (methylprednisolone acetate) meant for the treatment of chronic back pain. Now, according to a new study, it seems that the back problems that the steroid was meant to relieve might actually be made worse by the epidural injections [1].

In a study that was recently published in the journal Spine, a group of physicians followed 276 patients from the ages of 53-75 with more or less similar degrees of chronic back pain for four years. Of the 276 subjects, 69 received epidural steroid injections as a part of pain management therapy, while the remaining 207 did not. The authors of the study expected to see a wider variation of painful symptoms in the subjects who had not had epidural injections versus those who did. Instead, it seems that the subjects that underwent epidural injections displayed considerably less improvement after corrective surgical procedures than those who did not. 

The study was too small to draw any concrete conclusions, but it does seem that the steroid injections might hamper the healing process post surgery.

The subjects were all suffering from spinal stenosis, a condition wherein the open spaces within the spine gradually narrow, putting pressure on the spinal cord and causing sometimes extreme pain. The steroid injections ease the pain temporarily by surrounding the conflicted nerves.

Because spinal stenosis is a degenerative condition, the addition of the steroids may facilitate that degeneration, making the prognosis after surgery more grave than if the treatment was never administered.

Epidural injections are only recommended for patients who suffer from crippling back pain that may also spread to the arms, legs and head. These injections are not meant to cure the condition; only to make the symptoms more bearable. However, it is estimated that only approximately half of all the patients who receive epidural injections for treatment of back pain derive significant pain relief.

It should be noted that steroid injections should be viewed as a last resort in the event that other physical therapies and medications prove ineffective.

The injectable steroid used in such epidural injections that caused the fungal meningitis outbreak was methylprednisolone acetate, a steroid that was obtained through compounding pharmacies because FDA-regulated drug manufacturers do not make a version of the drug without preservatives.  The compounding pharmacy that was responsible for the contamination of the drug that was distributed to thousands of clinics throughout the nation has since declared bankruptcy.

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[1] Bakalar, Nicholas: Back Pain Unrelieved By Steroid Shots New York Times 3/5/2013 http://well.blogs.nytimes.com/2013/03/05/back-pain-unrelieved-by-steroid-shots/?ref=health

Physician reported to state health department about tainted batches of steroids months ago

Several months ago, a physician made her state health department aware of a tainted batch of methylprednisolone acetate, a steroid that is injected near the spinal column in order to treat some forms of chronic back pain, which seemed to be causing a violent form of fungal meningitis. This fungus was highly resistant to conventional forms of treatment, and finds the brain tissue the most hospitable environment, since the brain has low resistance to infection. Samples of the fungus have been difficult to detect in the infected patients; the most common and accurate method of detection has been extracting and testing spinal fluid. So what is this fungus, and how did it get into these medications?

Exserohilum rostratum: Cause of Infections

The fungus that caused these infections is called Exserohilum rostratum. It is highly resistant to the drug treatments, and because it is a pathogen that normally feeds on plant matter, it hasn’t received much research. It exists primarily in tropical and sub-tropical regions, but even though the laboratory was in New England, the messy environment would still be inviting to the fungus, which is airborne, and can travel in the winds from southern regions during the warmer months.

E. rostratum primarily attacks grasses. Plants have natural defensive mechanisms in place to keep the fungus from totally destroying them, but they cannot kill it outright. The fungus is like a vulture; it exists on plants and waits until the plant dies before it feeds on the remains. It can multiply very quickly; a colony can develop from a single spore in as little as two days.

What caused the meningitis outbreak?

While E. rostratum is almost never the cause of eye or sinus infections, there are increasing examples of this spore, and others related to it, causing more soft tissue infections than had ever been previously seen. Nevertheless, when the fungus was injected directly into the spinal column, it was easily carried by the spinal fluid—a nutritious and comfortable environment for the spores—into the brain, where it may have caused the strokes that killed some of the infected patients.

The sloppy conditions in which the medications were compounded would have been a welcoming environment for the spores, which can accumulate on lawn clippings and launch themselves into the air via a natural static electricity-based ejection mechanism. The fact that they got into the vials of medication isn’t surprising, under the circumstances, but why did they only contaminate some of the batches and not all of them? It is speculated that the spores were blown into the air from a nearby source on only one windy day, but no one yet knows the exact cause.