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Usman S, Badar F, Collado C, Weber A, Kaell A. Septic Shock From Pan-Spinal Epidural Abscess Attributed to Recent Acupuncture and Trigger Point Injections for Acute Lower Back Pain in a Previously Undiagnosed Diabetic Patient: A Case Report. Cureus 2023; 15:e40088. [PMID: 37292108 PMCID: PMC10246864 DOI: 10.7759/cureus.40088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/07/2023] [Indexed: 06/10/2023] Open
Abstract
Epidural abscesses can lead to devastating neurological consequences if not diagnosed and managed in a timely manner, especially in immunocompromised patients. We report the case of a 60-year-old woman with undiagnosed diabetes mellitus who presented to the hospital with a complaint of progressive altered mental status for the past two days. Eight days prior to presentation, the patient tripped over a pillow at home and developed mildly nagging, acute lower back pain. Upon the recommendation of her friends, she underwent two sessions of acupuncture around the lumbar area on days six and five prior to being brought to the hospital. She also saw her primary care physician on day three prior to presentation, who performed a history and physical examination and, after feeling that she did not have any red flags, empirically administered lidocaine-based trigger point injections near the same lumbar areas with the patient's consent. On the day of presentation, the patient fell at home and was unable to walk, after which she was immediately brought to the hospital, where she demonstrated toxic metabolic encephalopathy due to diabetic ketoacidosis (DKA) and lower extremity paraplegia. Emergent imaging revealed a pan-spinal epidural abscess (PSEA) after an attempted lumbar puncture led to immediate pus in the syringe. Diagnosing an epidural abscess can be difficult as signs and symptoms can mimic other conditions such as meningitis, encephalitis, and stroke. High suspicion on the physician's end is needed when a patient presents with acute back pain, fevers, and neurological deterioration if the condition is otherwise unexplained, and especially in the presence of risk factors for PSEA that may be recognized only upon presentation.
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Affiliation(s)
- Shaheryar Usman
- Internal Medicine, Mather Hospital, Northwell Health, Port Jefferson, USA
| | - Faraz Badar
- Internal Medicine, Mather Hospital, Northwell Health, Port Jefferson, USA
| | - Carlos Collado
- Internal Medicine, Mather Hospital, Northwell Health, Port Jefferson, USA
| | - Andrew Weber
- Critical Care and Pulmonary Medicine, Mather Hospital, Northwell Health, Port Jefferson, USA
- Critical Care and Pulmonary Medicine, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, USA
| | - Alan Kaell
- Internal Medicine, Mather Hospital, Northwell Health, Port Jefferson, USA
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Abstract
Myofascial pain and myofascial pain syndromes are among some of the most common acute and chronic pain conditions. Many interventional procedures can be performed in both an acute and chronic pain setting to address myofascial pain syndromes. Trigger point injections can be performed with or without imaging guidance such as fluoroscopy and ultrasound; however, the use of imaging in years past has been recommended to improve patient outcome and safety. Injections can be performed using no injectate (dry needling), or can involve the administration of local anesthetics, botulinum toxin, or corticosteroids.
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Salamone FJ, Kanamalla K, Songmen S, Sapire J. Bilateral supraclavicular abscesses following trigger point injections. Radiol Case Rep 2021; 16:2630-2633. [PMID: 34295446 PMCID: PMC8282958 DOI: 10.1016/j.radcr.2021.06.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/09/2021] [Accepted: 06/12/2021] [Indexed: 11/17/2022] Open
Abstract
A 54-year-old-woman presented to the emergency department with worsening bilateral shoulder pain six days after trigger point injections in the bilateral supraclavicular areas for chronic pain. A computed tomography scan of the neck revealed bilateral irregular rim enhancing fluid collections. Image-guided percutaneous drainage resulted in marked improvement and near complete resolution by 17 days post-drainage. This case demonstrates the need for early detection of soft-tissue infection and abscess formation related to interventional pain procedures to avoid potentially life-threatening complications, such as Staphylococcus aureus bacteremia.
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Affiliation(s)
- Frank J Salamone
- Frank H. Netter MD School of Medicine, Quinnipiac University, 370 Bassett Rd, North Haven, CT 06473, USA
| | - Karthik Kanamalla
- Frank H. Netter MD School of Medicine, Quinnipiac University, 370 Bassett Rd, North Haven, CT 06473, USA
| | | | - Joshua Sapire
- St. Vincent's Medical Center, 2800 Main St, Bridgeport, CT 06606, USA
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A Contemporary Medicolegal Analysis of Outpatient Interventional Pain Procedures: 2009-2016. Anesth Analg 2020; 129:255-262. [PMID: 30925562 DOI: 10.1213/ane.0000000000004096] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Closed malpractice claim studies allow a review of rare but often severe complications, yielding useful insight into improving patient safety and decreasing practitioner liability. METHODS This retrospective observational study of pain medicine malpractice claims utilizes the Controlled Risk Insurance Company Comparative Benchmarking System database, which contains nearly 400,000 malpractice claims drawn from >400 academic and community medical centers. The Controlled Risk Insurance Company Comparative Benchmarking System database was queried for January 1, 2009 through December 31, 2016, for cases with pain medicine as the primary service. Cases involving outpatient interventional pain management were identified. Controlled Risk Insurance Company-coded data fields and the narrative summaries were reviewed by the study authors. RESULTS A total of 126 closed claims were identified. Forty-one claims resulted in payments to the plaintiffs, with a median payment of $175,000 (range, $2600-$2,950,000). Lumbar interlaminar epidural steroid injections were the most common procedures associated with claims (n = 34), followed by cervical interlaminar epidural steroid injections (n = 31) and trigger point injections (n = 13). The most common alleged injuring events were an improper performance of a procedure (n = 38); alleged nonsterile technique (n = 17); unintentional dural puncture (n = 13); needle misdirected to the spinal cord (n = 11); and needle misdirected to the lung (n = 10). The most common alleged outcomes were worsening pain (n = 26); spinal cord infarct (n = 16); epidural hematoma (n = 9); soft-tissue infection (n = 9); postdural puncture headache (n = 9); and pneumothorax (n = 9). According to the Controlled Risk Insurance Company proprietary contributing factor system, perceived deficits in technical skill were present in 83% of claims. CONCLUSIONS Epidural steroid injections are among the most commonly performed interventional pain procedures and, while a familiar procedure to pain management practitioners, may result in significant neurological injury. Trigger point injections, while generally considered safe, may result in pneumothorax or injury to other deep structures. Ultimately, the efforts to minimize practitioner liability and patient harm, like the claims themselves, will be multifactorial. Best outcomes will likely come from continued robust training in procedural skills, attention paid to published best practice recommendations, documentation that includes an inclusive consent discussion, and thoughtful patient selection. Limitations for this study are that closed claim data do not cover all complications that occur and skew toward more severe complications. In addition, the data from Controlled Risk Insurance Company Comparative Benchmarking System cannot be independently verified.
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Robbins MS, Kuruvilla D, Blumenfeld A, Charleston L, Sorrell M, Robertson CE, Grosberg BM, Bender SD, Napchan U, Ashkenazi A. Trigger point injections for headache disorders: expert consensus methodology and narrative review. Headache 2014; 54:1441-59. [PMID: 25168295 DOI: 10.1111/head.12442] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2014] [Indexed: 12/20/2022]
Abstract
OBJECTIVE/BACKGROUND To review the existing literature and describe a standardized methodology by expert consensus for the performance of trigger point injections (TPIs) in the treatment of headache disorders. Despite their widespread use, the efficacy, safety, and methodology of TPIs have not been reviewed specifically for headache disorders by expert consensus. METHODS The Peripheral Nerve Blocks and Other Interventional Procedures Special Interest Section of the American Headache Society over a series of meetings reached a consensus for nomenclature, indications, contraindications, precautions, procedural details, outcomes, and adverse effects for the use of TPIs for headache disorders. A subcommittee of the Section also reviewed the literature. RESULTS Indications for TPIs may include many types of episodic and chronic primary and secondary headache disorders, with the presence of active trigger points (TPs) on physical examination. Contraindications may include infection, a local open skull defect, or an anesthetic allergy, and precautions are necessary in the setting of anticoagulant use, pregnancy, and obesity with unclear anatomical landmarks. The most common muscles selected for TPIs include the trapezius, sternocleidomastoid, and temporalis, with bupivacaine and lidocaine the agents used most frequently. Adverse effects are typically mild with careful patient and procedural selection, though pneumothorax and other serious adverse events have been infrequently reported. CONCLUSIONS When performed in the appropriate setting and with the proper expertise, TPIs seem to have a role in the adjunctive treatment of the most common headache disorders. We hope our effort to characterize the methodology of TPIs by expert opinion in the context of published data motivates the performance of evidence-based and standardized treatment protocols.
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Affiliation(s)
- Matthew S Robbins
- Montefiore Headache Center, Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
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Song JY, Son JB, Lee MK, Gwack J, Lee KS, Park JY. Case series of mycobacterium abscessus infections associated with a trigger point injection and epidural block at a rural clinic. Epidemiol Health 2012; 34:e2012001. [PMID: 22323979 PMCID: PMC3272546 DOI: 10.4178/epih/e2012001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 12/28/2011] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES The aim of this report is to investigate Mycobacterium abscessus infections at a rural clinic and carry out a surveillance program to determine the extent and source of these infections. METHODS The authors conducted an active surveillance investigation of 36 patients who had visited the clinic since 1 July 2008. Clinical specimens were collected from the patients and an envirnmental investigation. Pulsed-field gel elctrophoresis (PFGE) was performed for comparing with M. abscessus isolates from the patients. RESULTS Six specimens were obtained from the 6 patients respectively and 22 environmental samples were obtained. M. abscessus was isolated from the wounds of two patients, and various nosocomial pathogens, but not M. abscessus, were isolated from the surrounding environment. Two strains of M. abscessus from patients were identical as a result of PFGE. CONCLUSION Infection control education including proper hand hygiene should be emphasized for physicians performing invasive procedures. There also needs to be more attention for invasive procedures management, including trigger point injection and epidural block in rural clinics.
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Affiliation(s)
- Jun Young Song
- Epidemic Intelligence Service, Division of Public Health Administration, Gyeongnam Provincial Office, Changwon, Korea
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Abstract
STUDY DESIGN A retrospective case report. OBJECTIVE The objective of this article is to report an unusual complication of dry needling. SUMMARY OF BACKGROUND DATA Epidural hematomas after dry needling are quite unusual and only a few cases of epidural hematoma after acupuncture have been reported in the literature. We are presenting the first report of acute cervical epidural hematoma after dry needling. METHODS A 58-year-old woman presented with quadriparesis and neck pain. Magnetic resonance imaging of the spine revealed a hyperintense mass in the T2-weighted magnetic resonance image at the C2-T2 level, which proved to be an epidural hematoma. RESULTS Symptoms related to the epidural hematoma resolved after decompression. CONCLUSION Though rare, epidural hematomas are a possible complication when applying needling therapies. Therapists need to have precise knowledge of human anatomy, especially in the region where he or she will puncture. Continuous attention must be paid throughout the whole procedure.
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Scott NA, Guo B, Barton PM, Gerwin RD. Trigger Point Injections for Chronic Non-Malignant Musculoskeletal Pain: A Systematic Review. PAIN MEDICINE 2009; 10:54-69. [DOI: 10.1111/j.1526-4637.2008.00526.x] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
ABSTRACT
Objective. This systematic review assessed the available published evidence on the efficacy and safety of using trigger point injection (TPI) to treat patients with chronic non-malignant musculoskeletal pain that had persisted for at least 3 months.
Methods. All published systematic reviews or randomized controlled trials detailing the use of TPI in patients with chronic, non-malignant musculoskeletal pain (persisting for >3 months) were identified by systematically searching literature databases and the Websites of various health technology assessment agencies, research registers, and guidelines sites up to July 2006.
Results. Although no systematic reviews were identified, 15 peer-reviewed randomized controlled trials met the inclusion criteria. However, deficiencies in reporting, small sample sizes, and marked inter-study heterogeneity precluded a definitive synthesis of the data. TPI is a safe procedure when used by clinicians with appropriate expertise and training. It relieved symptoms when used as a sole treatment for patients with chronic head, neck, shoulder, and back pain or whiplash syndrome, regardless of the injectant used, and may be a useful adjunct to intra-articular injection in the treatment of osteoarthritis pain. Although the addition of TPI to stretching exercises augments treatment outcomes, this was also true of other therapies such as ultrasound and laser.
Conclusion. The efficacy of TPI is no more certain than it was a decade ago as, overall, there is no clear evidence of either benefit or ineffectiveness. The only advantage of injecting anesthetic into trigger points may be to reduce the pain of the needling process, which may not be an insignificant benefit.
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Affiliation(s)
| | - Bing Guo
- Institute of Health Economics, Edmonton
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Reid PJ, Holman PJ. Iatrogenic pyogenic osteomyelitis of C-1 and C-2 treated with transoral decompression and delayed posterior occipitocervical arthrodesis. Case report. J Neurosurg Spine 2008; 7:664-8. [PMID: 18074694 DOI: 10.3171/spi-07/12/664] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The authors describe a case of osteomyelitis of the craniocervical junction caused by iatrogenic infection of the spine during corticosteroid injection therapy. This 58-year-old diabetic man presented with acute exacerbation of neck pain that had began 4 months prior to admission. He did not experience the associated fever, chills, or sweats, but he did notice transient weakness in the right upper extremity. A computed tomography (CT) scan of the cervical spine demonstrated a destructive process involving the odontoid and the left occipitocervical and atlantoaxial joints that was not present on a CT obtained 2 months earlier, just before trigger-point and left-sided C1-2 facet joint corticosteroid injections. A diagnosis of staphylococcal osteomyelitis was made, and initial treatment with external immobilization and appropriate antibiotic therapy failed to control radiographically demonstrated and clinical progression. The patient was successfully treated using staged anterior decompression and posterior instrumented fusion with prolonged antibiotic therapy. To the authors' knowledge this case is the first reported instance of iatrogenic pyogenic osteomyelitis of the craniocervical junction successfully treated with anterior decompression and delayed posterior arthrodesis.
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Affiliation(s)
- Patrick J Reid
- Department of Neurosurgery, University of Rochester Medical Center, Rochester, New York 14642-8670, USA.
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Malanga G, Wolff E. Evidence-informed management of chronic low back pain with trigger point injections. Spine J 2008; 8:243-52. [PMID: 18164472 DOI: 10.1016/j.spinee.2007.10.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Accepted: 10/13/2007] [Indexed: 02/03/2023]
Abstract
The management of chronic low back pain (CLBP) has proven very challenging in North America, as evidenced by its mounting socioeconomic burden. Choosing amongst available nonsurgical therapies can be overwhelming for many stakeholders, including patients, health providers, policy makers, and third-party payers. Although all parties share a common goal and wish to use limited health-care resources to support interventions most likely to result in clinically meaningful improvements, there is often uncertainty about the most appropriate intervention for a particular patient. To help understand and evaluate the various commonly used nonsurgical approaches to CLBP, the North American Spine Society has sponsored this special focus issue of The Spine Journal, titled Evidence-Informed Management of Chronic Low Back Pain Without Surgery. Articles in this special focus issue were contributed by leading spine practitioners and researchers, who were invited to summarize the best available evidence for a particular intervention and encouraged to make this information accessible to nonexperts. Each of the articles contains five sections (description, theory, evidence of efficacy, harms, and summary) with common subheadings to facilitate comparison across the 24 different interventions profiled in this special focus issue, blending narrative and systematic review methodology as deemed appropriate by the authors. It is hoped that articles in this special focus issue will be informative and aid in decision making for the many stakeholders evaluating nonsurgical interventions for CLBP.
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Affiliation(s)
- Gerard Malanga
- Overlook Pain Center, 11 Overlook Road, Summit, NJ 07901, USA.
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Abstract
Prevention of complications is one of the most important aspects of patient care in pain management. The objective of this study is to review documented complications in medical literature that are associated with interventional pain management, specifically those associated with joint, tendon, and muscle injections. We conducted Medline research from 1966 to November 2006 using keywords complication, injection, radiofrequency, closed claim, facet, zygophyseal joint, sacroiliac joint, shoulder, hip, knee, carpel tunnel, bursa, and trigger point. We found over 35 relevant papers in forms of original articles, case reports, and reviews. The most common complications appear to be infections that have been associated with virtually all of these injections. These infections include spondylodiscitis, septic arthritis, epidural abscess, necrotizing fasciitis, osteomyelitis, gas gangrene, and albicans arthritis. Other complications include spinal cord injury and peripheral nerve injuries, pneumothorax, air embolism, pain or swelling at the site of injection, chemical meningism, granulomatous inflammation of the synovium, aseptic acute arthritis, embolia cutis medicamentosa, skeletal muscle toxicity, and tendon and fascial ruptures. We suggest that many of the infectious complications may be preventable by strict adherence to aseptic techniques and that some of the other complications may be minimized by refining the procedural techniques with a clear understanding of the relevant anatomies.
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Affiliation(s)
- Jianguo Cheng
- Department of Pain Management, Division of Anesthesiology, Critical Care, and Comprehensive Pain Management, Cleveland Clinic Foundation
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Kim DH, Kim HS. Epidural and Psoas Abscesses Recognized after Paravertebral Trigger Point Injection - A case report -. Korean J Pain 2007. [DOI: 10.3344/kjp.2007.20.1.74] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Dong Hee Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Dankook University, Cheonan, Korea
| | - Hee Soo Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Dankook University, Cheonan, Korea
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Burgess CM, Wolverson AS, Dale MT. Cervical epidural abscess: a rare complication of intravenous cannulation. Anaesthesia 2005; 60:605-8. [PMID: 15918833 DOI: 10.1111/j.1365-2044.2005.04155.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Epidural abscess is a rare but life threatening condition that requires early diagnosis and prompt management. We report a case of cervical epidural abscess following an intravenous cannula site infection. The organism responsible was Methicillin Resistant Staphylococcus Aureus (MRSA). Management involved surgery, prolonged antibiotics and ventilation. Despite this, there was no return of neurological function and the patient died. We review the literature on epidural abscesses unrelated to catheterisation or instrumentation of the epidural space and discuss the aetiology and clinical features of this acute medical emergency.
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Affiliation(s)
- C M Burgess
- Department of Anaesthetics, City Hospital, Hucknall Road, Nottingham NG5 1PB, UK
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Mehta SH, Shih R. Cervical epidural abscess associated with massively elevated erythrocyte sedimentation rate. J Emerg Med 2004; 26:107-9. [PMID: 14751486 DOI: 10.1016/j.jemermed.2003.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We present a case of an elderly woman who presented with neck pain, low-grade fever, bandemia, and a massively elevated erythrocyte sedimentation rate (ESR) who had a cervical epidural abscess. We believe that the selective use of ESR assisted in narrowing the differential diagnosis, as the patient had no neurological deficits and no predisposing factors such as distal infection, immunosuppression, trauma, or recent surgery. Furthermore, in the literature, an elevated ESR is consistently found in patients with epidural abscesses, whereas clinical findings such as fever, leukocytosis, and neurological deficits are only variably present.
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Affiliation(s)
- Sameer H Mehta
- Department of Emergency Medicine, Englewood Hospital and Medical Center, Englewood, New Jersey 07631, USA
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Huang RC, Shapiro GS, Lim M, Sandhu HS, Lutz GE, Herzog RJ. Cervical epidural abscess after epidural steroid injection. Spine (Phila Pa 1976) 2004; 29:E7-9. [PMID: 14699291 DOI: 10.1097/01.brs.0000106764.40001.84] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN This is a case report of a cervical epidural abscess presenting with neurologic deficits after cervical epidural steroid injection. OBJECTIVE To describe the presentation, diagnosis, treatment, and outcome of a rare complication of cervical epidural steroid injection. SUMMARY OF BACKGROUND DATA Cervical epidural steroid injections are a commonly used modality in the treatment of cervical spine disease. Serious complications from the procedure are rare. There is only one previously reported case of cervical epidural abscess after cervical epidural injection in the literature. MATERIALS AND METHODS A case of cervical epidural abscess after epidural steroid injection is presented and the relevant literature is reviewed. RESULTS The patient had partial recovery of neurologic function within the first 24 hours after decompressive laminectomy, irrigation, and debridement. There were no perioperative complications. Intraoperative cultures permitted positive identification of the infecting organism and appropriate antibiotic selection. At 7-month follow-up, there was no recurrence of infection and the patient had recovered baseline neurologic function and neck pain status. CONCLUSIONS Cervical epidural abscess is a rare but potentially devastating complication after epidural steroid injection. Neurologic compromise may occur. Timely diagnosis and appropriate treatment may result in good clinical outcomes.
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Affiliation(s)
- Russel C Huang
- Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, USA.
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Vilke GM, Honingford EA. Cervical spine epidural abscess in a patient with no predisposing risk factors. Ann Emerg Med 1996; 27:777-80. [PMID: 8644971 DOI: 10.1016/s0196-0644(96)70201-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We report a case of cervical spine epidural abscess in a 50-year-old man with a 4-day history of neck pain but no neurologic deficits or fever. The patient had no predisposing risk factors such as recent spinal surgery, trauma, instrumentation, distal site of infection, immunosuppression, diabetes, or i.v. drug abuse. A review of the literature follows.
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Affiliation(s)
- G M Vilke
- Department of Emergency Medicine University of California, San Diego, Medical Center 92103-8676, USA
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