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Epidural steroid injections
An epidural injection delivers steroids into the epidural space around spinal nerve roots to relieve pain - back pain, leg pain, or other pain—caused by irritated spinal nerves. The steroid used in the epidural steroid injection reduces the inflammation of those nerves, which is often the source of the pain. It is important to note that an epidural steroid injection should not be considered a cure for back pain or leg pain: rather, the goal is to help patients get enough pain relief in order to be able to progress with their rehabilitation program.
An epidural steroid injection significantly reduces pain for approximately 50% of patients. It works by delivering steroids directly to the painful area to help decrease the inflammation that may be causing the pain. In addition to relieving pain, the process of natural healing can occur more quickly once the inflammation is reduced.
Prior to your procedure
DO NOT take any type of blood thinning medication Non-Steroidal Anti-
inflammatory (NSAID), Aspirin, Motrin, or Celebrex 3 days prior to injection
If taking Coumadin (Warfarin) or an anti-platelet drug (Plavix, Ticlid) you
must be off this medication long enough for your blood to normalize.
Please let us know if you are using Coumadin or Plavix or Ticlid.
You will need someone to drive you home after the injection, please make
Please bring with you a list of your medications and the dosing.
Take your medications, EXCEPT
NSAIDS, Coumadin and other Anti-
You may have a light meal prior to the procedure.
Epidural steroid injection procedure
The injection procedure for an epidural includes the following steps:
The patient lies face down on an x-ray table and the skin is well cleaned
The area where the epidural needle will be inserted is numbed with a local
Fluoroscopy (a guided X-ray procedure where the doctor can watch the
placement and movement of the needle) will be used to direct a small needle into the epidural space. The patient will feel some pressure during this part. Fluoroscopy is important in this procedure to help ensure correct placement of the medications.
A contrast dye is injected to confirm that the medicine spreads to the
affected nerve(s) in the epidural space.
A combination of numbing medicine (an anesthetic) and time released
anti-inflammatory medicine (a steroid) is injected.
The procedure usually takes approximately 30 minutes, followed by about 30 minutes of recovery time. On the day of the epidural steroid injection the patient should not drive. Rest is needed and strenuous activities must be avoided on the day of the epidural steroid injection.
Epidural injection results and follow-up
Following the epidural injection, some partial numbness from the anesthetic may occur in the patient’
s arms or legs. Any partial numbness usually subsides after a
few hours. Any remaining pain needs to be reported to the physician.
There may be an increase in the patient’
days. This may occur after the numbing medicine wears off but before the steroid has had a chance to work. Ice packs may help reduce the inflammation and will typically be more helpful than heat during this time. Improvements in pain will generally occur within 10 days after the epidural injection, and may be noticed as soon as one to five days after the injection.
Regular medicines may be taken after an epidural steroid injection. On the day following the procedure, the patient may return to his or her regular activities. When the pain has improved, regular exercise may be resumed in moderation. Even if improvement is significant, activities should be increased slowly over one to two weeks to avoid recurrence of pain.
Epidural results and precautions
As with any medical procedure, there are certain drawbacks and potential risks associated with an epidural steroid injection for back pain, leg pain or arm pain. One of the most important issues to consider is that the procedure only tends to significantly lessen the patient’
Effectiveness of epidural injections
Unfortunately, epidural steroid injections are not always effective—it is estimated that they help relieve the patient’
s pain only about 50% of the time. In some
cases the pain relief will be permanent. In others, the pain will be lessened enough to allow the patient to progress with rehabilitation and exercise, which helps the patient heal and find pain relief on a long-term basis.
If excellent pain relief is obtained from the first epidural injection, there will be no need to repeat it. If there is a partial benefit (greater than 30% relief from pain) the epidural injection can be repeated for possible additional benefit, or it may be necessary to conduct additional tests to more accurately determine what is causing the patient’
s pain. Up to three epidural steroid injections may be
performed, spaced at least two to four weeks apart. If the initial injection provides minimal benefit (less than 30% pain relief) the physician may either repeat the injection, or try a different type of injection or treatment.
Potential risks and complications include, but are not limited to:
As with all invasive medical procedures, there are potential risks associated with epidural steroid injections. However, in general the risk is low, and complications are rare. Potential risks include:
Infection. Minor infections occur in 1% to 2% of all injections. Severe
infections are rare, occurring in 0.1% to 0.01% of injections.
Bleeding. A rare complication, bleeding is more common for patients with
Nerve damage. While extremely rare, nerve damage can occur from direct
trauma from the needle, or secondarily from infection or bleeding.
Dural puncture ("wet tap"). A dural puncture occurs in 0.5% of injections. It
may cause a post-dural puncture headache (also called a spinal headache) that usually gets better within a few days. Although rare, a blood patch may be necessary to alleviate the headache from a dural puncture.
In addition to risks from the injection, approximately 2% of patients will experience side effects from the steroid medication, such as:
Transient flushing with a feeling of warmth (‘
Fluid retention, weight gain, or increased appetite Elevated blood pressure Mood swings, irritability, anxiety, insomnia
High blood sugar—diabetic patients should inform their primary care
physicians about the injection prior to their appointment
Transient decrease in immunity Cataracts—a rare result of excessive and/or prolonged steroid usage Severe arthritis of the hips or shoulders (avascular necrosis)—a rare result
of excessive and/or prolonged steroid usage
Lumbar epidural steroid injections should not be performed on patients who have a local or systemic bacterial infection, are pregnant (if fluoroscopy is used) or have bleeding problems. Epidural injections should also not be performed for patients whose pain is from a tumor or infection, and if suspected, an MRI scan should be done prior to the injection to rule out these conditions.
Copyright 2011, TOG All rights reserved. Revised 3/10/11
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