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The effect of epidural methylprednisolone acetate injection on the hypothalamic-pituitary-adrenal axis. 2013

George Habib, and Adel Jabbour, and Jameel Salman, and Geries Hakim, and Henry Haddad
Rheumatology Clinic, Nazareth Hospital, Nazareth 16000, Israel; Deputy, Department of Medicine, Carmel Medical Center, Haifa, Technion Faculty of Medicine, Haifa 34362, Israel. Electronic address: gshabib@gmail.com.

OBJECTIVE To evaluate the effect of an epidural corticosteroid injection of 80 mg and 40 mg of methylprednisolone acetate on the hypothalamic-pituitary-adrenal axis and on back pain. METHODS Randomized, single-blinded prospective study. METHODS Operating room of a university-affiliated hospital. METHODS 42 patients with low back pain due to radiculopathy. METHODS Group 1 received an epidural corticosteroid injection of 80 mg of methylprednisolone acetate, and Group 2 received an epidural corticosteroid injection of 40 mg of methylprednisolone acetate. All study patients underwent a stimulation test of one μg of adrenocorticotropin hormone (ACTH), and their pain levels were graded just prior to and following the epidural corticosteroid injection on weeks one, 3, and 4. METHODS Serum cortisol of the ACTH stimulation tests and back pain levels were rated using a visual analog scale (VAS). Serum cortisol levels lower than 18 ng/mL 30 minutes following the ACTH stimulation test were considered to be secondary adrenal insufficiency. RESULTS 21 patients were enrolled in each group. The rate of secondary adrenal insufficiency in Group 1 was ~86%, ~ 22%, and ~17% of patients versus ~53% (P = 0.024), 15% (P = 0.874), and ~12% (P = 0.715) of Group 2 patients at weeks one, 3, and 4, respectively. About 62%, 56%, and 39% of Group 1 patients had a favorable clinical response as opposed to ~47% (P = 0362), 35% (P = 0.21), and ~6% (P = 0.049) of Group 2 patients at weeks one, 3, and 4, respectively. CONCLUSIONS Epidural corticosteroid injection of methylprednisolone acetate in both groups was associated with very high rates of secondary adrenal insufficiency, but significantly more so in Group 1 at week one. This suppression was transient, with recovery of the gland in most patients noted over the ensuing weeks. An epidural corticosteroid injection of 80 mg had higher rates of favorable clinical response than a 40 mg injection, but significantly more so at week 4 only. This favorable response waned over a few weeks in both groups.

UI MeSH Term Description Entries
D007030 Hypothalamo-Hypophyseal System A collection of NEURONS, tracts of NERVE FIBERS, endocrine tissue, and blood vessels in the HYPOTHALAMUS and the PITUITARY GLAND. This hypothalamo-hypophyseal portal circulation provides the mechanism for hypothalamic neuroendocrine (HYPOTHALAMIC HORMONES) regulation of pituitary function and the release of various PITUITARY HORMONES into the systemic circulation to maintain HOMEOSTASIS. Hypothalamic Hypophyseal System,Hypothalamo-Pituitary-Adrenal Axis,Hypophyseal Portal System,Hypothalamic-Pituitary Unit,Hypothalamic Hypophyseal Systems,Hypothalamic Pituitary Unit,Hypothalamo Hypophyseal System,Hypothalamo Pituitary Adrenal Axis,Portal System, Hypophyseal
D007268 Injections, Epidural The injection of drugs, most often analgesics, into the spinal canal without puncturing the dura mater. Epidural Injections,Extradural Injections,Peridural Injections,Injections, Extradural,Injections, Peridural,Epidural Injection,Extradural Injection,Injection, Epidural,Injection, Extradural,Injection, Peridural,Peridural Injection
D008297 Male Males
D008775 Methylprednisolone A PREDNISOLONE derivative with similar anti-inflammatory action. 6-Methylprednisolone,Medrol,Metipred,Urbason,6 Methylprednisolone
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010147 Pain Measurement Scales, questionnaires, tests, and other methods used to assess pain severity and duration in patients or experimental animals to aid in diagnosis, therapy, and physiological studies. Analgesia Tests,Analogue Pain Scale,Formalin Test,McGill Pain Questionnaire,Nociception Tests,Pain Assessment,Pain Intensity,Pain Severity,Tourniquet Pain Test,Visual Analogue Pain Scale,Analog Pain Scale,Assessment, Pain,McGill Pain Scale,Visual Analog Pain Scale,Analgesia Test,Analog Pain Scales,Analogue Pain Scales,Formalin Tests,Intensity, Pain,Measurement, Pain,Nociception Test,Pain Assessments,Pain Intensities,Pain Measurements,Pain Questionnaire, McGill,Pain Scale, Analog,Pain Scale, Analogue,Pain Scale, McGill,Pain Severities,Pain Test, Tourniquet,Questionnaire, McGill Pain,Scale, Analog Pain,Scale, Analogue Pain,Scale, McGill Pain,Severity, Pain,Test, Analgesia,Test, Formalin,Test, Nociception,Test, Tourniquet Pain,Tests, Nociception,Tourniquet Pain Tests
D010913 Pituitary-Adrenal System The interactions between the anterior pituitary and adrenal glands, in which corticotropin (ACTH) stimulates the adrenal cortex and adrenal cortical hormones suppress the production of corticotropin by the anterior pituitary. Pituitary Adrenal System,Pituitary-Adrenal Systems,System, Pituitary-Adrenal,Systems, Pituitary-Adrenal
D011446 Prospective Studies Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group. Prospective Study,Studies, Prospective,Study, Prospective
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D005260 Female Females

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