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Iyengar KP, Jain VK, Awadalla Mohamed MK, Vaishya R, Vinjamuri S. Update on functional imaging in the evaluation of diabetic foot infection. J Clin Orthop Trauma 2021; 16:119-124. [PMID: 33680832 PMCID: PMC7919944 DOI: 10.1016/j.jcot.2020.12.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 02/06/2023] Open
Abstract
Diabetic foot infection is a preventable complication of diabetes mellitus. It is an essential component of diabetic foot disease, which is characterised by a triad of neuropathy, ischaemia and infection. These factors may lead to foot ulceration, sepsis and amputation resulting in increased morbidity and poor quality of life. Confirming or excluding infection can be difficult especially when routine laboratory tests and plain radiographs are inconclusive. Early diagnosis and localization of diabetic foot infection is extremely important to institute timely, appropriate therapy. Structural imaging using computed tomography and magnetic resonance imaging all have individual applications towards the diagnostic workup of this condition but have their own limitations. Scintigraphic detection is based on physiochemical changes and hence provides a functional evaluation of bone pathology. We describe the evolution of functional nuclear medicine imaging including immunoscintigraphy in diabetic foot infection and highlight current applications of physiological 18-Fluoro-deoxyglucose positron emission tomography (18-FDG-PET) and computed tomography (18-FDG-PET/CT) in such patients. 18-FDG-PET/CT is a promising modality for imaging diabetic foot infection. Future studies will allow standardisation of technological details and options of 18-FDG-PET/CT interpretation in diabetic foot infection.
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Affiliation(s)
- Karthikeyan P. Iyengar
- Trauma and Orthopaedic Surgeon, Southport and Ormskirk NHS Trust, Southport, PR8 6PN, UK
| | - Vijay K. Jain
- Department of Orthopaedics, Atal Bihari Vajpayee Institute of Medical Sciences, Dr Ram Manohar Lohia Hospital, New Delhi 110001, India,Corresponding author.
| | | | - Raju Vaishya
- Department of Orthopaedics, Indraprastha Apollo Hospital, Sarita Vihar, Mathura Road, 110076, New Delhi, India
| | - Sobhan Vinjamuri
- Nuclear Medicine, Royal Liverpool University Hospital, Prescot Street, Liverpool, L7 8XP, UK
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Llewellyn A, Jones-Diette J, Kraft J, Holton C, Harden M, Simmonds M. Imaging tests for the detection of osteomyelitis: a systematic review. Health Technol Assess 2020; 23:1-128. [PMID: 31670644 DOI: 10.3310/hta23610] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Osteomyelitis is an infection of the bone. Medical imaging tests, such as radiography, ultrasound, magnetic resonance imaging (MRI), single-photon emission computed tomography (SPECT) and positron emission tomography (PET), are often used to diagnose osteomyelitis. OBJECTIVES To systematically review the evidence on the diagnostic accuracy, inter-rater reliability and implementation of imaging tests to diagnose osteomyelitis. DATA SOURCES We conducted a systematic review of imaging tests to diagnose osteomyelitis. We searched MEDLINE and other databases from inception to July 2018. REVIEW METHODS Risk of bias was assessed with QUADAS-2 [quality assessment of diagnostic accuracy studies (version 2)]. Diagnostic accuracy was assessed using bivariate regression models. Imaging tests were compared. Subgroup analyses were performed based on the location and nature of the suspected osteomyelitis. Studies of children, inter-rater reliability and implementation outcomes were synthesised narratively. RESULTS Eighty-one studies were included (diagnostic accuracy: 77 studies; inter-rater reliability: 11 studies; implementation: one study; some studies were included in two reviews). One-quarter of diagnostic accuracy studies were rated as being at a high risk of bias. In adults, MRI had high diagnostic accuracy [95.6% sensitivity, 95% confidence interval (CI) 92.4% to 97.5%; 80.7% specificity, 95% CI 70.8% to 87.8%]. PET also had high accuracy (85.1% sensitivity, 95% CI 71.5% to 92.9%; 92.8% specificity, 95% CI 83.0% to 97.1%), as did SPECT (95.1% sensitivity, 95% CI 87.8% to 98.1%; 82.0% specificity, 95% CI 61.5% to 92.8%). There was similar diagnostic performance with MRI, PET and SPECT. Scintigraphy (83.6% sensitivity, 95% CI 71.8% to 91.1%; 70.6% specificity, 57.7% to 80.8%), computed tomography (69.7% sensitivity, 95% CI 40.1% to 88.7%; 90.2% specificity, 95% CI 57.6% to 98.4%) and radiography (70.4% sensitivity, 95% CI 61.6% to 77.8%; 81.5% specificity, 95% CI 69.6% to 89.5%) all had generally inferior diagnostic accuracy. Technetium-99m hexamethylpropyleneamine oxime white blood cell scintigraphy (87.3% sensitivity, 95% CI 75.1% to 94.0%; 94.7% specificity, 95% CI 84.9% to 98.3%) had higher diagnostic accuracy, similar to that of PET or MRI. There was no evidence that diagnostic accuracy varied by scan location or cause of osteomyelitis, although data on many scan locations were limited. Diagnostic accuracy in diabetic foot patients was similar to the overall results. Only three studies in children were identified; results were too limited to draw any conclusions. Eleven studies evaluated inter-rater reliability. MRI had acceptable inter-rater reliability. We found only one study on test implementation and no evidence on patient preferences or cost-effectiveness of imaging tests for osteomyelitis. LIMITATIONS Most studies included < 50 participants and were poorly reported. There was limited evidence for children, ultrasonography and on clinical factors other than diagnostic accuracy. CONCLUSIONS Osteomyelitis is reliably diagnosed by MRI, PET and SPECT. No clear reason to prefer one test over the other in terms of diagnostic accuracy was identified. The wider availability of MRI machines, and the fact that MRI does not expose patients to harmful ionising radiation, may mean that MRI is preferable in most cases. Diagnostic accuracy does not appear to vary with the potential cause of osteomyelitis or with the body part scanned. Considerable uncertainty remains over the diagnostic accuracy of imaging tests in children. Studies of diagnostic accuracy in children, particularly using MRI and ultrasound, are needed. STUDY REGISTRATION This study is registered as PROSPERO CRD42017068511. FUNDING This project was funded by the National Institute for Health Research Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 23, No. 61. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Alexis Llewellyn
- Centre for Reviews and Dissemination, University of York, York, UK
| | | | | | | | - Melissa Harden
- Centre for Reviews and Dissemination, University of York, York, UK
| | - Mark Simmonds
- Centre for Reviews and Dissemination, University of York, York, UK
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Imaging for detection of osteomyelitis in people with diabetic foot ulcers: A systematic review and meta-analysis. Eur J Radiol 2020; 131:109215. [PMID: 32862106 DOI: 10.1016/j.ejrad.2020.109215] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/09/2020] [Accepted: 08/08/2020] [Indexed: 01/09/2023]
Abstract
BACKGROUND Osteomyelitis is an infection of the bone which can occur in people with diabetic foot ulcers. It can be diagnosed using X-rays, ultrasound, scintigraphy, magnetic resonance imaging (MRI), single photon emission computed tomography (SPECT) and positron emission tomography (PET). OBJECTIVES To review the evidence on the diagnostic accuracy of imaging tests to diagnose osteomyelitis in people with diabetic foot ulcers. METHODS We conducted a systematic review and meta-analysis. MEDLINE, EMBASE and other databases were searched to July 2018. Risk of bias was evaluated. Diagnostic accuracy was estimated using bivariate meta-analyses. RESULTS Thirty-six studies were included in the meta-analysis. Eight studies were at high risk of bias MRI had high diagnostic accuracy (22 studies: 96.4 % sensitivity (95 % CI 90.7-98.7); 83.8 % specificity (76.0-89.5)). PET scans also had high accuracy (6 studies: 84.3 % sensitivity (52.8-96.3); 92.8 % specificity (75.7-98.2)), and possibly also SPECT, but with few studies (3 studies: 95.6 % sensitivity (76.0-99.3); 55.1 % specificity (19.3-86.3)). Scintigraphy (17 studies: 84.2 % sensitivity (76.8-89.6); 67.7 % specificity (56.2-77.4)), and X-rays (16 studies: 61.9 % sensitivity (50.5-72.1); 78.3 % specificity (62.9-88.5)) had generally inferior diagnostic accuracy. CONCLUSIONS MRI and PET both reliably diagnose osteomyelitis in diabetic foot ulcer patients. SPECT may also have good diagnostic accuracy, although evidence is limited. This review confirms most current guidelines, showing that MRI may be the preferable test in most cases, given its wider availability and the lack of potentially harmful ionising radiation.
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Chou TH, Stacy MR. Clinical Applications for Radiotracer Imaging of Lower Extremity Peripheral Arterial Disease and Critical Limb Ischemia. Mol Imaging Biol 2019; 22:245-255. [PMID: 31482412 DOI: 10.1007/s11307-019-01425-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Peripheral arterial disease (PAD) is an atherosclerotic occlusive disease of the non-coronary vessels that is characterized by lower extremity tissue ischemia, claudication, increased prevalence of lower extremity wounds and amputations, and impaired quality of life. Critical limb ischemia (CLI) represents the severe stage of PAD and is associated with additional risk for wound formation, amputation, and premature death. Standard clinical tools utilized for assessing PAD and CLI primarily focus on anatomical evaluation of peripheral vascular lesions or hemodynamic assessment of the peripheral circulation. Evaluation of underlying pathophysiology has traditionally been achieved by radiotracer-based imaging, with many clinical investigations focusing on imaging of skeletal muscle perfusion and cases of foot infection/inflammation such as osteomyelitis and Charcot neuropathic osteoarthropathy. As advancements in hybrid imaging systems and radiotracers continue to evolve, opportunities for molecular imaging of PAD and CLI are also emerging that may offer novel insight into associated complications such as peripheral atherosclerosis, alterations in skeletal muscle metabolism, and peripheral neuropathy. This review summarizes the pros and cons of radiotracer-based techniques that have been utilized in the clinical environment for evaluating lower extremity ischemia and common pathologies associated with PAD and CLI.
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Affiliation(s)
- Ting-Heng Chou
- Center for Regenerative Medicine, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, WB4131, Columbus, OH, 43215, USA
| | - Mitchel R Stacy
- Center for Regenerative Medicine, The Research Institute at Nationwide Children's Hospital, 575 Children's Crossroad, WB4131, Columbus, OH, 43215, USA. .,Division of Vascular Diseases and Surgery, Department of Surgery, The Ohio State University College of Medicine, Columbus, OH, USA.
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Loessel C, Mai A, Starke M, Vogt D, Stichling M, Willy C. Value of antigranulocyte scintigraphy with Tc-99m-sulesomab in diagnosing combat-related infections of the musculoskeletal system. BMJ Mil Health 2019; 167:8-17. [PMID: 30787111 DOI: 10.1136/jramc-2019-001172] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 01/23/2019] [Indexed: 12/22/2022]
Abstract
AIM Combat-related extremity injuries are regularly associated with long-term complications such as chronic infection, especially osteomyelitis. Clinical examination and laboratory parameters do not usually allow reliable diagnosis. In contrast, imaging techniques enable constructive assertions to be made about the location and extent of an infection of the peripheral musculoskeletal system. The aim of this study was therefore to determine the diagnostic reliability of three-phase bone scanning and antigranulocyte scintigraphy using Tc-99m-sulesomab (Leukoscan) in the diagnostic clarification of infections associated with combat-related extremity injuries. METHODS Twenty-seven male patients (mean age 33.9 years) with suspected combat-associated infections of the extremities were included in this retrospective analysis. All patients underwent three-phase bone scanning using Tc-99m-HDP followed by antigranulocyte scintigraphy with Tc-99m-sulesomab. In 26 of the 27 patients, a CT scan of affected limb was obtained, where the secondary fusion with single photon emission CT data set was possible. The diagnostic reliability of imaging techniques was validated against microbiological samples obtained during surgery and used as gold standard. RESULTS Three-phase bone scanning yielded a positive result in all patients, with 18 scans classified as true positive (TP) and nine scans as false positive (FP). This produced a sensitivity of 100%, a specificity of 0% and a positive predictive value (PPV) of 67%. Antigranulocyte scintigraphy recognised 13 patients as TP, 1 patient as FP, 8 patients as true negative (TN) and 5 patients as false negative (FN), which gave a sensitivity of 72%, a specificity of 88%, a PPV of 93%, a negative predictive value (NPV) of 62% and an accuracy of 78%. CT recognised in 7 cases a TP result, in 3 cases an FP, in 5 cases a TN and in 11 cases an FN result. This produced a sensitivity of 39%, a specificity of 63%, a PPV of 70%, an NPV of 31% and an accuracy of 46%. CONCLUSIONS Three-phase bone scanning did not deliver any diagnostic benefit, since no result was able to differentiate unequivocally between infection-related and reactive changes. Antigranulocyte scintigraphy using Tc-99m-sulesomab represented a highly suitable technique for diagnostically clarifying combat-related infections of the extremities. It is superior to CT in sensitivity, specificity, PPV, NPV and accuracy.
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Affiliation(s)
- Christian Loessel
- Department of Nuclear Medicine, Bundeswehrkrankenhaus Berlin, Berlin, Germany
| | - A Mai
- Department of Nuclear Medicine, Bundeswehrkrankenhaus Berlin, Berlin, Germany
| | - M Starke
- Department of Nuclear Medicine, Bundeswehrkrankenhaus Berlin, Berlin, Germany
| | - D Vogt
- Department of Traumatology and Orthopaedics, Septic and Reconstructive Surgery, Bundeswehrkrankenhaus Berlin, Berlin, Germany
| | - M Stichling
- Department of Traumatology and Orthopaedics, Septic and Reconstructive Surgery, Bundeswehrkrankenhaus Berlin, Berlin, Germany
| | - C Willy
- Department of Traumatology and Orthopaedics, Septic and Reconstructive Surgery, Bundeswehrkrankenhaus Berlin, Berlin, Germany
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Lauri C, Tamminga M, Glaudemans AWJM, Juárez Orozco LE, Erba PA, Jutte PC, Lipsky BA, IJzerman MJ, Signore A, Slart RHJA. Detection of Osteomyelitis in the Diabetic Foot by Imaging Techniques: A Systematic Review and Meta-analysis Comparing MRI, White Blood Cell Scintigraphy, and FDG-PET. Diabetes Care 2017; 40:1111-1120. [PMID: 28733376 DOI: 10.2337/dc17-0532] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/03/2017] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Diagnosing bone infection in the diabetic foot is challenging and often requires several diagnostic procedures, including advanced imaging. We compared the diagnostic performances of MRI, radiolabeled white blood cell (WBC) scintigraphy (either with 99mTc-hexamethylpropyleneamineoxime [HMPAO] or 111In-oxine), and [18F]fluorodeoxyglucose positron emission tomography (18F-FDG-PET)/computed tomography. RESEARCH DESIGN AND METHODS We searched Medline and Embase as of August 2016 for studies of diagnostic tests on patients known or suspected to have diabetes and a foot infection. We performed a systematic review using criteria recommended by the Cochrane Review of a database that included prospective and retrospective diagnostic studies performed on patients with diabetes in whom there was a clinical suspicion of osteomyelitis of the foot. The preferred reference standard was bone biopsy and subsequent pathological (or microbiological) examination. RESULTS Our review found 6,649 articles; 3,894 in Medline and 2,755 in Embase. A total of 27 full articles and 2 posters was selected for inclusion in the analysis. The performance characteristics for the 18F-FDG-PET were: sensitivity, 89%; specificity, 92%; diagnostic odds ratio (DOR), 95; positive likelihood ratio (LR), 11; and negative LR, 0.11. For WBC scan with 111In-oxine, the values were: sensitivity, 92%; specificity, 75%; DOR, 34; positive LR, 3.6; and negative LR, 0.1. For WBC scan with 99mTc-HMPAO, the values were: sensitivity, 91%; specificity, 92%; DOR, 118; positive LR, 12; and negative LR, 0.1. Finally, for MRI, the values were: sensitivity, 93%; specificity, 75%; DOR, 37; positive LR, 3.66, and negative LR, 0.10. CONCLUSIONS The various modalities have similar sensitivity, but 18F-FDG-PET and 99mTc-HMPAO-labeled WBC scintigraphy offer the highest specificity. Larger prospective studies with a direct comparison among the different imaging techniques are required.
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Affiliation(s)
- Chiara Lauri
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.,Nuclear Medicine Unit, Faculty of Medicine and Psychology, Department of Medical-Surgical Sciences and of Translational Medicine, Sapienza University of Rome, Rome, Italy
| | - Menno Tamminga
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Andor W J M Glaudemans
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Luis Eduardo Juárez Orozco
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Paola A Erba
- Department of Nuclear Medicine, University of Pisa, Pisa, Italy
| | - Paul C Jutte
- Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Benjamin A Lipsky
- Division of Medical Sciences, Green Templeton College, University of Oxford, Oxford, U.K.,Department of Medicine, University of Washington, Seattle, WA
| | - Maarten J IJzerman
- Department of Health Technology and Services Research, MIRA Institute for Biomedical Technology & Technical Medicine, University of Twente, Enschede, the Netherlands
| | - Alberto Signore
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.,Nuclear Medicine Unit, Faculty of Medicine and Psychology, Department of Medical-Surgical Sciences and of Translational Medicine, Sapienza University of Rome, Rome, Italy
| | - Riemer H J A Slart
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands .,Department of Biomedical Photonic Imaging, University of Twente, Enschede, the Netherlands
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Palestro CJ. Radionuclide Imaging of Musculoskeletal Infection: A Review. J Nucl Med 2016; 57:1406-12. [PMID: 27390160 DOI: 10.2967/jnumed.115.157297] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/29/2016] [Indexed: 12/12/2022] Open
Abstract
There are numerous imaging tests for diagnosing musculoskeletal infection. Radiographs are routinely performed, because even when not diagnostic, they provide an anatomic overview of the region of interest that could influence subsequent procedure selection and interpretation. MRI is sensitive and provides superb anatomic detail. Bone scintigraphy accurately diagnoses osteomyelitis in bones not affected by underlying conditions. (67)Ga is used primarily for spondylodiskitis. Although in vitro labeled leukocyte imaging is the radionuclide test of choice for complicating osteomyelitis such as diabetic pedal osteomyelitis and prosthetic joint infection, it is not useful for spondylodiskitis. Antigranulocyte antibodies and antibody fragments have limitations and are not widely available. (111)In-biotin is useful for spondylodiskitis. Radiolabeled synthetic fragments of the antimicrobial peptide ubiquicidin are promising infection-specific agents. (18)F-FDG is the radiopharmaceutical of choice for spondylodiskitis. Its role in diabetic pedal osteomyelitis and prosthetic joint infection is not established. Preliminary data suggest (68)Ga may be useful in musculoskeletal infection. (124)I-fialuridine initially showed promise as an infection-specific radiopharmaceutical, but subsequent investigations were disappointing. The development of PET/CT and SPECT/CT imaging systems, which combine anatomic and functional imaging, has revolutionized diagnostic imaging. These hybrid systems are redefining the diagnostic workup of patients with suspected or known infection and inflammation by improving diagnostic accuracy and influencing patient management.
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Lipsky BA, Aragón-Sánchez J, Diggle M, Embil J, Kono S, Lavery L, Senneville É, Urbančič-Rovan V, Van Asten S, Peters EJG. IWGDF guidance on the diagnosis and management of foot infections in persons with diabetes. Diabetes Metab Res Rev 2016; 32 Suppl 1:45-74. [PMID: 26386266 DOI: 10.1002/dmrr.2699] [Citation(s) in RCA: 329] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Benjamin A Lipsky
- Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
- University of Oxford, Oxford, UK
| | | | - Mathew Diggle
- Nottingham University Hospitals Trust, Nottingham, UK
| | - John Embil
- University of Manitoba, Winnipeg, MB, Canada
| | - Shigeo Kono
- WHO-collaborating Centre for Diabetes, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan
| | - Lawrence Lavery
- University of Texas Southwestern Medical Center and Parkland Hospital, Dallas, TX, USA
| | | | | | - Suzanne Van Asten
- University of Texas Southwestern Medical Center and Parkland Hospital, Dallas, TX, USA
- VU University Medical Centre, Amsterdam, The Netherlands
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Abstract
Foot infections are common in persons with diabetes mellitus. Most diabetic foot infections occur in a foot ulcer, which serves as a point of entry for pathogens. Unchecked, infection can spread contiguously to involve underlying tissues, including bone. A diabetic foot infection is often the pivotal event leading to lower extremity amputation, which account for about 60% of all amputations in developed countries. Given the crucial role infections play in the cascade toward amputation, all clinicians who see diabetic patients should have at least a basic understanding of how to diagnose and treat this problem.
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Affiliation(s)
- Edgar J G Peters
- Department of Internal Medicine, VU University Medical Center, Room ZH4A35, PO Box 7057, Amsterdam NL-1007MB, The Netherlands.
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Lipsky BA, Peters EJG, Senneville E, Berendt AR, Embil JM, Lavery LA, Urbančič-Rovan V, Jeffcoate WJ. Expert opinion on the management of infections in the diabetic foot. Diabetes Metab Res Rev 2012; 28 Suppl 1:163-78. [PMID: 22271739 DOI: 10.1002/dmrr.2248] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This update of the International Working Group on the Diabetic Foot incorporates some information from a related review of diabetic foot osteomyelitis (DFO) and a systematic review of the management of infection of the diabetic foot. The pathophysiology of these infections is now well understood, and there is a validated system for classifying the severity of infections based on their clinical findings. Diagnosing osteomyelitis remains difficult, but several recent publications have clarified the role of clinical, laboratory and imaging tests. Magnetic resonance imaging has emerged as the most accurate means of diagnosing bone infection, but bone biopsy for culture and histopathology remains the criterion standard. Determining the organisms responsible for a diabetic foot infection via culture of appropriately collected tissue specimens enables clinicians to make optimal antibiotic choices based on culture and sensitivity results. In addition to culture-directed antibiotic therapy, most infections require some surgical intervention, ranging from minor debridement to major resection, amputation or revascularization. Clinicians must also provide proper wound care to ensure healing of the wound. Various adjunctive therapies may benefit some patients, but the data supporting them are weak. If properly treated, most diabetic foot infections can be cured. Providers practising in developing countries, and their patients, face especially challenging situations.
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Affiliation(s)
- B A Lipsky
- VA Puget Sound Health Care System, University of Washington, Seattle, WA 98108, USA.
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Signore A, Glaudemans AWJM. The molecular imaging approach to image infections and inflammation by nuclear medicine techniques. Ann Nucl Med 2011; 25:681-700. [PMID: 21837469 DOI: 10.1007/s12149-011-0521-z] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 07/21/2011] [Indexed: 12/13/2022]
Abstract
Inflammatory and infectious diseases are a heterogeneous class of diseases that may be divided into infections, acute inflammation and chronic inflammation. Radiological imaging techniques have, with the exception of functional MRI, high sensitivity but lack in specificity. Nuclear medicine techniques, by contrast, allow the in vivo detection in humans of different physiologic and pathologic phenomena and offer noninvasive tools to detect early pathophysiological changes before anatomical changes occur. In this review, we highlight the role of nuclear medicine in inflammation/infection with emphasis on molecular imaging for in vivo histological characterization of affected tissues for diagnostic purposes and follow-up of therapies. We also describe the clinical indications of all available radiopharmaceuticals in the light of the newly available guidelines.
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Affiliation(s)
- Alberto Signore
- Medicina Nucleare, 2nd Faculty of Medicine, Ospedale S. Andrea, University of Rome "Sapienza", Via di Grottarossa 1035, 00189 Rome, Italy.
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Signore A, Mather SJ, Piaggio G, Malviya G, Dierckx RA. Molecular imaging of inflammation/infection: nuclear medicine and optical imaging agents and methods. Chem Rev 2010; 110:3112-45. [PMID: 20415479 DOI: 10.1021/cr900351r] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- A Signore
- Nuclear Medicine Unit, II Faculty of Medicine and Surgery, Sapienza University of Rome, Rome, Italy.
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13
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Yang Z, Kontoyiannis DP, Wen X, Xiong C, Zhang R, Albert ND, Li C. Gamma scintigraphy imaging of murine invasive pulmonary aspergillosis with a (111)In-labeled cyclic peptide. Nucl Med Biol 2009; 36:259-66. [PMID: 19324271 DOI: 10.1016/j.nucmedbio.2008.12.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2008] [Revised: 11/09/2008] [Accepted: 12/08/2008] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Invasive pulmonary aspergillosis (IPA) is a leading cause of infection-associated death in immunosuppressed patients. Early detection and early administration of antifungal therapy are critical factors in improving outcome for patients with IPA. Here, we evaluated the imaging properties of a (111)In-labeled cyclic peptide targeted to Aspergillus fumigatus in an immunosuppressed murine model of IPA. METHODS A cyclic peptide c(CGGRLGPFC)-NH(2) was labeled with (111)In by means of diethylenetriaminepentaacetic acid (DTPA). Two days after intranasal inoculation of 17.5x10(6) conidia of A. fumigatus, mice were injected (111)In-DTPA-c(CGGRLGPFC)-NH(2) intravenously. Biodistribution data were obtained at 2 h, and gamma-images were acquired at 10 min and 2 h after radiotracer injection. Healthy mice were used as controls. In addition, a group of infected mice were co-injected with the radiotracer and unlabeled c(CGGRLGPFC)-NH(2) to evaluate the inhibition of radiotracer's binding to infected lungs. Autoradiographs of lungs from infected and healthy mice were compared with corresponding photographs of transaxial sections of the lung tissues stained for A. fumigatus hyphae. RESULTS The labeling efficiency was >98%, with specific radioactivity of up to 74 MBq/nmol peptide. Significantly higher uptake of (111)In-DTPA-c(CGGRLGPFC)-NH(2) was observed in the lungs of mice infected with A. fumigatus than in those of healthy mice (0.37+/-0.06 %ID/g vs. 0.14+/-0.02 %ID/g, P=.00044). Simultaneous injection with unlabeled peptide reduced radioactivity in the infected lungs by 41% (P=.0037). Increased radioactivity in the lungs of infected mice was visible in gamma images at both 10 min and 2 h after radiotracer injection. Moreover, autoradiography confirmed radiotracer uptake in infected lungs, but not in the lungs of healthy mice or infected mice co-injected with unlabeled peptide. CONCLUSIONS Gamma-imaging with (111)In-DTPA-c(CGGRLGPFC)-NH(2) clearly delineated experimental IPA in mice. Peptides directly targeting fungi therefore may be valuable agents for noninvasive detection of opportunistic mycoses.
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Affiliation(s)
- Zhi Yang
- Department of Experimental Diagnostic Imaging, Infection Control and Employee Health, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
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14
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Vartanians VM, Karchmer AW, Giurini JM, Rosenthal DI. Is there a role for imaging in the management of patients with diabetic foot? Skeletal Radiol 2009; 38:633-6. [PMID: 19241076 DOI: 10.1007/s00256-009-0663-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Vartan M Vartanians
- Department of Radiology, Massachusetts General Hospital, 25 New Chardon Street Suite 427-B, Boston, MA 02114, USA.
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15
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16
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Dinh MT, Abad CL, Safdar N. Diagnostic accuracy of the physical examination and imaging tests for osteomyelitis underlying diabetic foot ulcers: meta-analysis. Clin Infect Dis 2008; 47:519-27. [PMID: 18611152 DOI: 10.1086/590011] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Accurate diagnosis of osteomyelitis underlying diabetic foot ulcers is essential to optimize outcomes. We undertook a meta-analysis of the accuracy of diagnostic tests for osteomyelitis in diabetic patients with foot ulcers. Pooled sensitivity and specificity, the summary measure of accuracy (Q*), and diagnostic odds ratio were calculated. Exposed bone or probe-to-bone test had a sensitivity of 0.60 and a specificity of 0.91. Plain radiography had a sensitivity of 0.54 and a specificity of 0.68. MRI had a sensitivity of 0.90 and a specificity of 0.79. Bone scan was found to have a sensitivity of 0.81 and a specificity of 0.28. Leukocyte scan was found to have a sensitivity of 0.74 and a specificity of 0.68. The diagnostic odds ratios for clinical examination, radiography, MRI, bone scan, and leukocyte scan were 49.45, 2.84, 24.36, 2.10, and 10.07, respectively. The presence of exposed bone or a positive probe-to-bone test result is moderately predictive of osteomyelitis. MRI is the most accurate imaging test for diagnosis of osteomyelitis.
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Affiliation(s)
- Marie T Dinh
- Section of Infectious Diseases, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison
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17
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Pakos EE, Koumoullis HD, Koumoulis HD, Fotopoulos AD, Ioannidis JPA. Osteomyelitis: Antigranulocyte Scintigraphy with99mTc Radiolabeled Monoclonal Antibodies for Diagnosis—Meta-Analysis. Radiology 2007; 245:732-41. [PMID: 17898328 DOI: 10.1148/radiol.2452061877] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To perform a meta-analysis of the sensitivity and specificity of antigranulocyte scintigraphy with monoclonal antibodies (MoAbs) in the diagnosis of osteomyelitis across different patient groups and clinical settings. MATERIALS AND METHODS MEDLINE and EMBASE searches were conducted. Data on the diagnostic performance of antigranulocyte scintigraphy with MoAbs were combined. Weighted sensitivities and specificities were estimated by using a random-effects model that incorporated between-study heterogeneity and by constructing summary receiver operating characteristic (ROC) curves. The weighted positive and negative likelihood ratios (LRs) across studies were estimated. Data syntheses were performed for all patients and for various subgroups. The reference standard used in each individual study was accepted. RESULTS Nineteen nonoverlapping studies with a total of 714 examinations and reference standards of cell culture, histologic examination, clinical follow-up, and radiologic examination were eligible. The independent random-effects summary estimates of sensitivity and specificity were 81% (95% confidence interval [CI]: 70%, 88%) and 77% (95% CI: 66%, 86%), respectively, with statistically significant between-study heterogeneity (exact P < .001 for both metrics). In the summary ROC curve, a sensitivity of 81% corresponded to a specificity of 86%, and a specificity of 77% corresponded to a sensitivity of 87%. The weighted positive LR was 3.02 (95% CI: 2.07, 4.42), and the weighted negative LR was 0.26 (95% CI: 0.17, 0.39), with statistically significant between-study heterogeneity (exact P < .001 for both metrics). Sensitivity was better for peripheral than for axial skeleton lesions (87% vs 53%). CONCLUSION Antigranulocyte scintigraphy with MoAbs has a sensitivity of 81% and a specificity of 77% in the diagnosis of osteomyelitis.
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Affiliation(s)
- Emilios E Pakos
- Clinical Trials and Evidence-Based Medicine Unit, Department of Hygiene and Epidemiology, University Hospital of Ioannina School of Medicine, University Campus, Ioannina, Epirus 45110, Greece
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18
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Walker RC, Jones-Jackson LB, Martin W, Habibian MR, Delbeke D. New imaging tools for the diagnosis of infection. Future Microbiol 2007; 2:527-54. [DOI: 10.2217/17460913.2.5.527] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Infection imaging became widespread in 1971 with the release of 67Ga citrate. Multiphase skeletal scintigraphy and radiolabeled white blood cells (WBCs) have since become the most widespread clinically used agents for the imaging of infection. A wide variety of other radiolabeled probes are under investigation, based on antibodies, cytokines, assorted proteins and other molecules, alone or in various combinations. However, these latter agents, with a few exceptions, are not routinely used clinically. Radiolabeled ciprofloxacin represents the first attempt to develop an infection-specific imaging agent (most infection-imaging probes localized nonspecifically to inflammation as well), but it has not proven superior to radiolabeled WBCs or 18F-fluoro-deoxy-glucose (FDG) PET. Because of the ability to combine exquisite anatomic detail with focal uptake of 18F-FDG, PET–computed tomography has achieved great success in the detection and localization of infection, including in clinically adverse conditions. Despite these advances, at this time an infection-specific imaging agent does not exist.
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Affiliation(s)
- Ronald C Walker
- Associate Professor Vanderbilt University Medical Center, Department of Radiology & Radiological Sciences, 1161 21st Avenue South, CCC-1121 MCN, Nashville, TN 37232-2675, USA
| | - Laurie B Jones-Jackson
- Associate Professor Vanderbilt University Medical Center, Department of Radiology & Radiological Sciences, 1161 21st Avenue South, CCC-1121 MCN, Nashville, TN 37232-2675, USA
| | - William Martin
- Associate Professor Vanderbilt University Medical Center, Department of Radiology & Radiological Sciences, 1161 21st Avenue South, CCC-1121 MCN, Nashville, TN 37232-2675, USA
| | - M Reza Habibian
- Associate Professor Vanderbilt University Medical Center, Department of Radiology & Radiological Sciences, 1161 21st Avenue South, CCC-1121 MCN, Nashville, TN 37232-2675, USA
| | - Dominique Delbeke
- Professor Vanderbilt University Medical Center, Department of Radiology & Radiological Sciences, 1161 21st Avenue South, CCC-1121 MCN, Nashville, TN 37232-2675, USA
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Abstract
Medical imaging of the diabetic foot entails a variety of imaging modalities. The diagnostic evaluation often includes a gamut of studies that include conventional radiography, CT, nuclear medicine scintigraphy, MRI, ultrasonography, and a newcomer, positron emission tomography combined with CT and leukocyte labeling. There is not yet "one best test" for sorting out the diagnostic dilemmas that are commonly encountered. Confirmation or exclusion of the frequent diagnosis of osteomyelitis often requires multiple studies, which are complementary to one another.
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Affiliation(s)
- Rebecca A Loredo
- Department of Radiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.
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20
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Capriotti G, Chianelli M, Signore A. Nuclear medicine imaging of diabetic foot infection: results of meta-analysis. Nucl Med Commun 2007; 27:757-64. [PMID: 16969256 DOI: 10.1097/01.mnm.0000230065.85705.b3] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND AND AIM Osteomyelitis of the foot is the most commonly encountered complication in diabetic patients. Nuclear medicine techniques are usually complementary to radiology in the diagnosis of foot infections; they play an important role in various clinical situations. The aim of this study was to develop a practical guideline to describe the radiopharmaceuticals to be used for different clinical conditions and different aims in diabetic foot infection. METHODS In this study, we reviewed 57 papers (published between 1982 and 2004; 50 original papers and seven reviews) that described the imaging of the diabetic foot and examined a total of 2889 lesions. We performed data analysis to establish which imaging technique could be used as a 'gold standard' to diagnose infection, evaluate the extent of disease and monitor the efficacy of therapy. RESULTS AND CONCLUSION We provide a guideline to assist in the selection of the optimal radiopharmaceuticals for different clinical conditions and different aims.
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Affiliation(s)
- Gabriela Capriotti
- Nuclear Medicine, II Faculty of Medicine, University of Rome La Sapienza, Rome, Italy
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21
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Abstract
Foot problems are common causes of disability in diabetic patients with as many as 25% expected to develop severe foot or leg problems during their lifetimes. Although skin ulceration is the most frequent problem, bones may also be involved in two different clinical conditions: osteomyelitis and Charcot osteoarthropathy. Osteomyelitis causes complications in up to one third of diabetic foot infections and is due to direct contamination from a soft-tissue ulcer. Osteoarthropathy Charcot foot is a chronic and progressive disease of the bone and joints. Both osteomyelitis and Charcot joint are conditions with an increased risk of lower limb amputation, both may have a successful outcome when recognized and treated in the early stages. The major diagnostic difficulty is in distinguishing bone infection (osteomyelitis) from non-infectious neuropathic bony disorders as in osteoarthropathy Charcot foot. An additional difficulty is found when a bone infection superimposes a Charcot osteopathy. This condition, which can be clinically suspected when foot ulceration appears in Charcot foot, needs to be diagnosed because it implies a different therapeutic strategy. This article aims to summarize both these two clinical conditions and give indications to make a timely and correct diagnosis.
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Affiliation(s)
- Laura Giurato
- Department of Internal Medicine, Tor Vergata University of Rome, Italy
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Lipsky BA, Berendt AR, Deery HG, Embil JM, Joseph WS, Karchmer AW, LeFrock JL, Lew DP, Mader JT, Norden C, Tan JS. Diagnosis and treatment of diabetic foot infections. Plast Reconstr Surg 2006; 117:212S-238S. [PMID: 16799390 DOI: 10.1097/01.prs.0000222737.09322.77] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
EXECUTIVE SUMMARY: 1. Foot infections in patients with diabetes cause substantial morbidity and frequent visits to health care professionals and may lead to amputation of a lower extremity. 2. Diabetic foot infections require attention to local (foot) and systemic (metabolic) issues and coordinated management, preferably by a multidisciplinary foot-care team (A-II). The team managing these infections should include, or have ready access to, an infectious diseases specialist or a medical microbiologist (B-II). 3. The major predisposing factor to these infections is foot ulceration, which is usually related to peripheral neuropathy. Peripheral vascular disease and various immunological disturbances play a secondary role. 4. Aerobic Gram-positive cocci (especially Staphylococcus aureus) are the predominant pathogens in diabetic foot infections. Patients who have chronic wounds or who have recently received antibiotic therapy may also be infected with Gram-negative rods, and those with foot ischemia or gangrene may have obligate anaerobic pathogens. 5. Wound infections must be diagnosed clinically on the basis of local (and occasionally systemic) signs and symptoms of inflammation. Laboratory (including microbiological) investigations are of limited use for diagnosing infection, except in cases of osteomyelitis (B-II). 6. Send appropriately obtained specimens for culture before starting empirical antibiotic therapy in all cases of infection, except perhaps those that are mild and previously untreated (B-III). Tissue specimens obtained by biopsy, ulcer curettage, or aspiration are preferable to wound swab specimens (A-I). 7. Imaging studies may help diagnose or better define deep, soft-tissue purulent collections and are usually needed to detect pathological findings in bone. Plain radiography may be adequate in many cases, but MRI (in preference to isotope scanning) is more sensitive and specific, especially for detection of soft-tissue lesions (A-I). 8. Infections should be categorized by their severity on the basis of readily assessable clinical and laboratory features (B-II). Most important among these are the specific tissues involved, the adequacy of arterial perfusion, and the presence of systemic toxicity or metabolic instability. Categorization helps determine the degree of risk to the patient and the limb and, thus, the urgency and venue of management. 9. Available evidence does not support treating clinically uninfected ulcers with antibiotic therapy (D-III). Antibiotic therapy is necessary for virtually all infected wounds, but it is often insufficient without appropriate wound care. 10. Select an empirical antibiotic regimen on the basis of the severity of the infection and the likely etiologic agent(s) (B-II). Therapy aimed solely at aerobic Gram-positive cocci may be sufficient for mild-to-moderate infections in patients who have not recently received antibiotic therapy (A-II). Broad-spectrum empirical therapy is not routinely required but is indicated for severe infections, pending culture results and antibiotic susceptibility data (B-III). Take into consideration any recent antibiotic therapy and local antibiotic susceptibility data, especially the prevalence of methicillin-resistant S. aureus (MRSA) or other resistant organisms. Definitive therapy should be based on both the culture results and susceptibility data and the clinical response to the empirical regimen (C-III). 11. There is only limited evidence with which to make informed choices among the various topical, oral, and parenteral antibiotic agents. Virtually all severe and some moderate infections require parenteral therapy, at least initially (C-III). Highly bioavailable oral antibiotics can be used in most mild and in many moderate infections, including some cases of osteomyelitis (A-II). Topical therapy may be used for some mild superficial infections (B-I). 12. Continue antibiotic therapy until there is evidence that the infection has resolved but not necessarily until a wound has healed. Suggestions for the duration of antibiotic therapy are as follows: for mild infections, 12 weeks usually suffices, but some require an additional 12 weeks; for moderate and severe infections, usually 24 weeks is sufficient, depending on the structures involved, the adequacy of debridement, the type of soft-tissue wound cover, and wound vascularity (A-II); and for osteomyelitis, generally at least 46 weeks is required, but a shorter duration is sufficient if the entire infected bone is removed, and probably a longer duration is needed if infected bone remains (B-II). 13. If an infection in a clinically stable patient fails to respond to 1 antibiotic courses, consider discontinuing all antimicrobials and, after a few days, obtaining optimal culture specimens (C-III). 14. Seek surgical consultation and, when needed, intervention for infections accompanied by a deep abscess, extensive bone or joint involvement, crepitus, substantial necrosis or gangrene, or necrotizing fasciitis (A-II). Evaluating the limb's arterial supply and revascularizing when indicated are particularly important. Surgeons with experience and interest in the field should be recruited by the foot-care team, if possible. 15. Providing optimal wound care, in addition to appropriate antibiotic treatment of the infection, is crucial for healing (A-I). This includes proper wound cleansing, debridement of any callus and necrotic tissue, and, especially, off-loading of pressure. There is insufficient evidence to recommend use of a specific wound dressing or any type of wound healing agents or products for infected foot wounds. 16. Patients with infected wounds require early and careful follow-up observation to ensure that the selected medical and surgical treatment regimens have been appropriate and effective (B-III). 17. Studies have not adequately defined the role of most adjunctive therapies for diabetic foot infections, but systematic reviews suggest that granulocyte colony-stimulating factors and systemic hyperbaric oxygen therapy may help prevent amputations (B-I). These treatments may be useful for severe infections or for those that have not adequately responded to therapy, despite correcting for all amenable local and systemic adverse factors. 18. Spread of infection to bone (osteitis or osteomyelitis) may be difficult to distinguish from noninfectious osteoarthropathy. Clinical examination and imaging tests may suffice, but bone biopsy is valuable for establishing the diagnosis of osteomyelitis, for defining the pathogenic organism(s), and for determining the antibiotic susceptibilities of such organisms (B-II). 19. Although this field has matured, further research is much needed. The committee especially recommends that adequately powered prospective studies be undertaken to elucidate and validate systems for classifying infection, diagnosing osteomyelitis, defining optimal antibiotic regimens in various situations, and clarifying the role of surgery in treating osteomyelitis (A-III).
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Affiliation(s)
- Benjamin A Lipsky
- Medical Service, Veterans Affairs Puget Sound Health Care System, and Division of General Internal Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Wash 98108-9804, USA.
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23
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Abstract
Foot infection is the most common reason for hospitalization and subsequent lower extremity amputation among persons with diabetes. Foot ulceration caused by diabetic neuropathy, trauma, and peripheral vascular disease can lead to a limbor life-threatening infection. The optimum treatment of these potentially devastating conditions depends on a multidisciplinary approach that addresses the related or underlying disorders and thus ensures proper wound healing and a positive outcome. In addition to antibiotic therapy, severe soft-tissue or bone infections may necessitate surgical treatment, including drainage, débridement, and vascular reconstruction. Initial (empiric) antibiotic therapy should provide coverage against staphylococci and streptococci and should be revised according culture results. Antibiotic therapy is not indicated in clinically noninfected wounds. The duration of antibiotic treatment can range from 1 week for mild infections to 6 weeks or more for residual osteomyelitis and severe deep tissue infections. Aggressive (and sometimes repeated or staged) surgical intervention and appropriate antibiotic therapy can reduce the likelihood of a major amputation and the duration of hospitalization.
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Affiliation(s)
- Thomas Zgonis
- Department of Orthopaedics/Podiatry Division, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA
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Vicente AG, Almoguera M, Alonso JC, Heffernan AJ, Gomez A, Contreras PI, Martin-Comin J. Diagnosis of orthopedic infection in clinical practice using Tc-99m sulesomab (antigranulocyte monoclonal antibody fragment Fab'2). Clin Nucl Med 2005; 29:781-5. [PMID: 15545877 DOI: 10.1097/00003072-200412000-00001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The aim of the study was to analyze the use of Tc-99m-labeled antigranulocyte monoclonal antibody fragment Fab'2 (SMab, Leukoscan) in the diagnosis of acute osteomyelitis and articular prosthesis infection. One hundred seventeen patients (118 studies) have been included, 92 women and 25 men. Thirty-seven had a suspicion of osteomyelitis and 81 with suspicion of infection of a hip (35 patients) or a knee (45 patients) prosthesis. The mean age was 64 years. A 3-phase bone scan and a SMab scan were obtained in all patients. Antigranulocyte scans were obtained within 3 and 8 hours postinjection of 20 mCi (740 MBq) of Tc-99m-labeled antibody. Diagnosis of infection was based on bone biopsy in 8 cases and on at least 2 positive cultures in the remaining cases. Infection was ruled out with negative cultures or 1-year patient follow up with negative C-reactive protein and normal erythrocyte sedimentation rate. RESULTS Sensitivity, specificity, accuracy, and negative predictive value of Tc 99m-SMab scintigraphy were: 75%, 95%, 87%, and 92% for long bone osteomyelitis and 80%, 89%, 87%, and 91% for articular prosthesis infection, respectively. Positive predictive values were 83% and 63%, respectively. CONCLUSION Tc-99m-antigranulocyte monoclonal antibody fragment Fab'2 scintigraphy seems to be a useful method in the diagnosis of osteoarticular infection.
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Affiliation(s)
- A Garcia Vicente
- Nuclear Medicine and Traumatology Departments, Hospital de Alarcos (Ciudad Real), Spain
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25
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Delcourt A, Huglo D, Prangere T, Benticha H, Devemy F, Tsirtsikoulou D, Lepeut M, Fontaine P, Steinling M. Comparison between Leukoscan® (Sulesomab) and Gallium-67 for the diagnosis of osteomyelitis in the diabetic foot. DIABETES & METABOLISM 2005; 31:125-33. [PMID: 15959418 DOI: 10.1016/s1262-3636(07)70178-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVES The diagnosis of osteomyelitis in patients with diabetic foot is difficult both clinically and radiologically. An early diagnosis is crucial to optimize therapeutic strategy. Among the diagnostic methods currently used, scintigraphy with ex-vivo labelled white blood cells is the gold standard, but cannot be performed in all centers; therefore 67Gallium citrate (67Ga) imaging in combination with a bone scintigraphy is still widely used. METHOD The results of imaging 24 diabetic patients with 31 suspected osteomyelitic lesions using the antigranulocyte Fab' fragment (Sulesomab or LeukoScan or immunoscintigraphy) were prospectively compared with results from the bone scan coupled with 67Ga. The diagnosis of osteomyelitis was confirmed by either biopsy or follow-up, radiological imaging and clinical outcome. RESULTS AND CONCLUSION Sulesomab correctly identified 12 of 18 osteomyelitic lesions while 67Ga was able to detect only 8 of 18. Therefore the sensitivity is 67% for Sulesomab and 44% for 67Ga. Among the 13 non-osteomyelitic lesions imaging with Sulesomab was able to rule out infection in 11 cases and 67Ga in 10 cases. The specificity is therefore 85% for Sulesomab and 77% for 67Ga. Image interpretation for Sulesomab in this group of patients is occasionally suboptimal when imaging is performed at 3 hours post injection. High vascular background in the early images may obscure infection especially in small bones. Practically, scintigraphy with Sulesomab is fast and simple due to ease of labeling, no ex-vivo handling of blood, low radiation and provides rapid diagnosis. The diagnosis of osteomyelitis obtained by the antibody fragment scintigraphy influences the management (guided biopsy) and therapy. In several patients, imaging with Sulesomab was able to rule out osteomyelitis, helping to avoid useless antibiotic therapy and its associated side effects.
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Affiliation(s)
- A Delcourt
- Service de Médecine Nucléaire et Imagerie Fonctionnelle, Hôpital C. Huriez, C.H.R.U. de Lille, Lille, France.
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26
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Abstract
Foot ulceration can lead to devastating consequences in diabetic patients. They are not only associated with increased morbidity but also mortality. Foot infections result as a consequence of foot ulceration, which can occasionally lead to deep tissue infections and osteomyelitis; both of which can result in loss of limb. To prevent amputations prompt diagnosis and treatment is required. Understanding the pathology of the diabetic foot will help in the planning of appropriate investigations and treatment. Clinical diagnosis of infection is based on the presence of discharge from the ulcer, cellulitis, warmth and signs of toxicity; though the latter is uncommon. Deep tissue samples from the ulcer and/or blood cultures should be taken before, but without delaying the start of antibacterial treatment in limb and life-threatening infections. In milder infections wound sampling may direct appropriate antibacterial treatment. Staphylococcus aureus, followed by streptococci are the most common organisms causing infection and antibacterial treatment should be targeted against these organisms in mild infection possibly with monotherapy. But in serious infections combination therapy is required because these are usually caused by multiple organisms including anaerobes. Drug-resistant organisms are becoming more prevalent and methicillin-resistant infections can be treated effectively with a number of oral antibacterials either as monotherapy or in combination. Surgical treatment with debridement, for example, callus removal or drainage of pus form an important part of diabetic foot ulcer management especially in the presence of infection. Occasionally limited surgery including dead infected bone removal may be necessary for resolution of infection. Amputation is sometimes required as a last resort for limb or life preservation.
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Affiliation(s)
- Edward B Jude
- Tameside General Hospital, Ashton-Under-Lyne, Lancashire, UK.
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Cascio A, Iaria C, Campennì A, Blandino A, Baldari S. Use of sulesomab in the diagnosis of brucellar spondylitis. Clin Microbiol Infect 2004; 10:1020-2. [PMID: 15522009 DOI: 10.1111/j.1469-0691.2004.00961.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Twenty-two patients with suspected brucellar spondylitis were investigated to evaluate the possible diagnostic role of Sulesomab, a (99m)Tc-antigranulocyte antibody Fab' fragment. Sensitivity and specificity were compared with those of magnetic resonance imaging (MRI). Skeletal involvement was detected by MRI in 11 cases, while leukoscintigraphy indicated normal vertebral uptake in seven of these patients, increased uptake in two patients, and decreased uptake in two patients. Leukoscintigraphy of the 11 patients negative by MRI demonstrated increased uptake in two cases. The sensitivity and specificity of leukoscintigraphy were 27.2% and 81.1%, respectively. Based on these results, leukoscintigraphy is not indicated for the management of patients with suspected brucellar spondylitis.
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Affiliation(s)
- A Cascio
- Scuola di Specializzazione in Malattie Infettive, Dipartimento di Patologia Umana, Università di Messina, Messina, Italy.
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Lipsky BA, Berendt AR, Deery HG, Embil JM, Joseph WS, Karchmer AW, LeFrock JL, Lew DP, Mader JT, Norden C, Tan JS. Diagnosis and Treatment of Diabetic Foot Infections. Clin Infect Dis 2004; 39:885-910. [PMID: 15472838 DOI: 10.1086/424846] [Citation(s) in RCA: 575] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2004] [Accepted: 07/02/2004] [Indexed: 02/06/2023] Open
Affiliation(s)
- Benjamin A Lipsky
- Medical Service, Veterans Affairs Puget Sound Health Care System, and Division of General Internal Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, Washington 98108-9804, USA.
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29
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Jeffcoate WJ, Lipsky BA. Controversies in diagnosing and managing osteomyelitis of the foot in diabetes. Clin Infect Dis 2004; 39 Suppl 2:S115-22. [PMID: 15306989 DOI: 10.1086/383272] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The optimal approach to diagnosing and managing osteomyelitis of the foot in diabetes is unclear. Diagnosis is based on clinical signs, supplemented by a variety of imaging tests. Bone biopsy is the accepted criterion standard for diagnosis but is not used by many. Management traditionally involves surgical removal of infected bone, combined with antibiotic therapy. However, recent studies have shown that antibiotics alone may apparently eliminate bone infection in many cases. There is also evidence that early amputation of infected digits is frequently noncurative. Agreement on criteria for diagnosing osteomyelitis is required, and randomized trials are urgently needed, to determine the relative benefits of various surgical interventions and the optimal deployment of antibiotics. We review the microbiology of osteomyelitis of the foot in diabetes, the benefits and limitations of various diagnostic procedures, and the evidence for the effectiveness of both surgical and nonsurgical approaches to management.
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Affiliation(s)
- William J Jeffcoate
- Department of Diabetes and Endocrinology, City Hospital, Nottingham, United Kingdom.
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30
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Abstract
Diabetic foot infections frequently cause morbidity, hospitalization, and amputations. Gram-positive cocci, especially staphylococci and also streptococci, are the predominant pathogens. Chronic or previously treated wounds often yield several microbes on culture, including gram-negative bacilli and anaerobes. Optimal culture specimens are wound tissue taken after debridement. Infection of a wound is defined clinically by the presence of purulent discharge or inflammation; systemic signs and symptoms are often lacking. Only infected wounds require antibiotic therapy, and the agents, route, and duration are predicated on the severity of infection. Mild to moderate infections can usually be treated in the outpatient setting with oral agents; severe infections require hospitalization and parenteral therapy. Empirical therapy must cover gram-positive cocci and should be broad spectrum for severe infections. Definitive therapy depends on culture results and the clinical response. Bone infection is particularly difficult to treat and often requires surgery. Several adjuvant agents may be beneficial in some cases.
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Affiliation(s)
- Benjamin A Lipsky
- Department of Medicine, University of Washington School of Medicine, and General Internal Medicine Clinic, VA Puget Sound Health Care System, Seattle 98108-1597, USA.
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31
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Rubello D, Casara D, Maran A, Avogaro A, Tiengo A, Muzzio PC. Role of anti-granulocyte Fab??? fragment antibody scintigraphy (LeukoScan) in evaluating bone infection: acquisition protocol, interpretation criteria and clinical results. Nucl Med Commun 2004; 25:39-47. [PMID: 15061263 DOI: 10.1097/00006231-200401000-00006] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Scintigraphy using anti-granulocyte Fab' fragment (LeukoScan) was performed in a series of 220 consecutive patients with suspected bone infection referred to our centre between September 1999 and June 2002. Two protocols were compared for interpreting scans: (1) evaluation of early 4 h imaging alone (protocol A), and (2) evaluation both of early and delayed 24 h imaging (protocol B). Protocol A and protocol B showed equal values of sensitivity (91.9% in patients with diabetic foot and 84.2% in patients with joint prosthesis/peripheral bone implants). Conversely, specificity was higher adopting protocol B than protocol A: 87.5% vs 75.0% in patients with diabetic foot, and 85.7% vs 76.2% in patients with joint prosthesis/peripheral bone implants, respectively. In particular, an improvement in specificity using protocol B was found in those patients with infection and with only a mild LeukoScan uptake in the early 4 h imaging: in these patients an increasing uptake intensity pattern observed in the delayed 24 h imaging was indicative of infection while a decreasing pattern suggested a negative result. Instead, the evidence of a high uptake intensity in the early LeukoScan imaging was a strong indicator of infection and delayed imaging in these cases did not further improve specificity. In conclusion, in our experience, LeukoScan showed high sensitivity in diagnosing bone infection in patients with diabetic foot and joint prosthesis or other peripheral bone implants. Moreover, in patients with an early high LeukoScan uptake intensity further delayed images appears unnecessary for the purpose of diagnosing infection. In contrast in patients with an early mild LeukoScan uptake intensity only, delayed imaging appears to be recommendable for improving specificity.
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Affiliation(s)
- D Rubello
- 2nd Nuclear Medicine Service, General Hospital of Padova, Padova, Italy.
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Molina A, Valladares M, Magadán S, Sancho D, Viedma F, Sanjuan I, Gambón F, Sánchez-Madrid F, González-Fernández A. The use of transgenic mice for the production of a human monoclonal antibody specific for human CD69 antigen. J Immunol Methods 2003; 282:147-58. [PMID: 14604548 DOI: 10.1016/j.jim.2003.08.007] [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: 10/27/2022]
Abstract
The CD69 antigen is the earliest activation marker expressed on leukocyte surfaces after stimulation and it has been correlated with disease state in a variety of inflammatory and autoimmune diseases. We were interested in the generation of a human monoclonal antibody (mAb) against the CD69 antigen. To do this, mice carrying human Ig transgenes (on an inactivated endogenous immunoglobulin H and Igkappa background) were immunized with rat cells transfected with the human CD69 molecule. From over 2000 hybridoma clones generated in different fusions, we were able to obtain a human monoclonal antibody, hAIM-29, which specifically recognizes human CD69 on the surface of activated-human leukocytes. We demonstrate that the antibody is specific for the human CD69 molecule, as shown by double staining with mouse anti-human CD69 antibodies, ELISA, immunoblot and immunoprecipitation studies. Results of additional experiments show that hAIM-29 activates intracellular calcium influx without Ig cross-linking and enhances phorbol myristate acetate-induced cell proliferation in a manner similar to other mouse anti-CD69 antibodies. This report is the first to describe the isolation and characterization of a novel human mAb, hAIM-29, which may have therapeutic potential in diseases associated with the presence of activated cells expressing CD69 antigen.
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MESH Headings
- Animals
- Antibodies, Monoclonal/biosynthesis
- Antigens, CD/analysis
- Antigens, CD/immunology
- Antigens, Differentiation, T-Lymphocyte/analysis
- Antigens, Differentiation, T-Lymphocyte/immunology
- Calcium/metabolism
- Cell Line, Tumor
- Humans
- Lectins, C-Type
- Lymphocyte Activation
- Mice
- Mice, Transgenic
- Rats
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Affiliation(s)
- Ana Molina
- Area de Inmunología, Facultad de Ciencias, Universidad de Vigo, Lagoas-Marcosende s/n 36200 Vigo, Pontevedra, Spain
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Von Rothenburg T, Schaffstein J, Ludwig J, Vehling D, Köster O, Schmid G. Imaging osteomyelitis with Tc-99m-labeled antigranulocyte antibody Fab' fragments. Clin Nucl Med 2003; 28:643-7. [PMID: 12897648 DOI: 10.1097/01.rlu.0000079387.59160.00] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The purpose of this study was to evaluate the diagnostic value of Tc-99m-labeled antigranulocyte antibody fragments in the diagnosis of osteomyelitis. MATERIALS AND METHODS Thirty immunoscintigrams were evaluated retrospectively with 740 MBq (20 mCi) Tc-99m-labeled antigranulocyte antibodies. The final diagnoses were confirmed by histology, magnetic resonance imaging, computed tomography, and clinical follow-up. RESULTS In the retrospective analysis, 20 of 30 patients (67%) demonstrated a true-positive result. Three of 30 patients (10%) had a false-positive result. A false-negative result was found in a diabetic patient with a perforating ulcer of the foot. Six of 30 patients had a true-negative result. A high sensitivity of 95%, a relatively high specificity of 67%, and a high diagnostic accuracy of 86% were present in this study. CONCLUSION Tc-99m labeled monoclonal antibody-Fab' fragments are suitable for the detection of osteomyelitis. Its clinical application is simple. Its use guarantees a reliable and accurate diagnostic result just 1 to 2 hours after injection, making a late scan unnecessary. Coxarthrosis or hyperostosis can lead to false-positive results. A perforating ulcer of the foot may result in a false-negative conclusion.
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Affiliation(s)
- Thomas Von Rothenburg
- St. Josef Hospital-University Hospital, Department of Radiology and Nuclear Medicine, Germany.
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Signore A, Annovazzi A, Corsetti F, Capriotti G, Chianelli M, De Winter F, Scopinaro F. Biological imaging for the diagnosis of inflammatory conditions. BioDrugs 2003; 16:241-59. [PMID: 12196038 DOI: 10.2165/00063030-200216040-00002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Radiopharmaceuticals used for in vivo imaging of inflammatory conditions can be conveniently classified into six categories according to the different phases in which the inflammatory process develops. The trigger of an inflammatory process is a pathogenic insult (phase I) that causes activation of endothelial cells (phase II); there is then an increase of vascular permeability followed by tissue oedema (phase III). Phase IV is characterised by infiltration of polymorphonuclear cells, and a self-limiting regulatory process called apoptosis is observed (phase V). If the inflammatory process persists, late chronic inflammation takes place (phase VI). In some pathological conditions, such as organ-specific autoimmune diseases, chronic inflammation is present early in the disease. The aim of nuclear medicine in the field of inflammation/infection is to develop noninvasive tools for the in vivo detection of specific cells and tissues. This would allow early diagnosis of initial pathophysiological changes that are undetectable by clinical examination or by other diagnostic tools, and could also be used to evaluate the state of activity of the disease during therapy. These potential applications are of great interest in clinical practice. In this review, we describe the various approaches that have been developed in the last 25 years of experience. Recent advances in the diagnosis of inflammatory processes have led to the development of specific radiopharmaceuticals that are intended to allow specific stage-related diagnosis.
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Affiliation(s)
- Alberto Signore
- Department of Clinical Sciences, Nuclear Medicine, 2nd Faculty of Medicine, University of Rome, La Sapienza, Rome, Italy.
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Abstract
Studies have suggested that orthopaedic infection can be successfully imaged with 99mTc antigranulocyte antibody Fab' fragments (Leukoscan). This study examined the value of the technique in a UK clinical practice. A retrospective review of the first 55 patients imaged was performed. Patients had three-phase bone scintigraphy followed by Leukoscan imaging. The latter was performed using planar views 2 h and 6 h post-injection of 750 MBq 99mTc Leukoscan. In 47 patients there was adequate clinical information available to compare to the scintigraphy result. There were 13 positive infections. The Leukoscan findings produced 11 true positives, 26 true negatives, eight false positives and two false negatives with resulting sensitivity 85%, specificity 77%, positive predictive accuracy 58%, and negative predictive accuracy 93%. This study suggests that Leukoscan can be used successfully to image orthopaedic infection, with its greatest strength being a high negative predictive accuracy. Positive studies may require further correlative imaging.
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Affiliation(s)
- Paul J Ryan
- Department of Nuclear Medicine, Medway Maritime Hospital, Windmill Road, Gillingham, Kent ME7 5NY, UK.
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Ivancevic V, Huic D, Wolter A, Munz DL. Bone marrow scintigraphy with 99m Tc labelled monoclonal anti-NCA 90 Fab' fragment: a feasibility study and comparison of bone marrow uptake with 99m Tc labelled monoclonal anti-NCA 95 antigranulocyte antibody. Nucl Med Commun 2002; 23:249-55. [PMID: 11891483 DOI: 10.1097/00006231-200203000-00008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The aim of this retrospective study was to evaluate the usefulness of 99mTc labelled monoclonal anti-NCA 90 antigranulocyte antibody Fab' fragment (MN3 Fab') as a bone marrow imaging agent. One hundred and ten planar scans (88 patients) of the lumbar and sacroiliac regions as well as whole-body scans were performed after 1, 5 and 24 h. All the scans were evaluated visually and bone marrow uptake was determined semiquantitatively as count density ratio from sacroiliac-minus-background to background area. Results were compared to 50 age-matched patients with normal bone marrow scans obtained with the intact 99mTc labelled monoclonal anti-NCA 95 antigranulocyte antibody (BW 250/183) in a previous study. Seventy-three patients showed a physiological activity distribution in the central bone marrow. Ten patients showed a bone marrow extension, while in two patients central bone marrow depression was observed. Evaluation of the ribs, lower thoracic and upper lumbar spine was hampered by soft-tissue activity. Bone marrow uptake was 1.36+/-0.56 after 1 h, decreased thereafter and was significantly lower than that of BW 250/183 (P < 0.001). In conclusion, MN3 Fab' cannot be recommended for bone marrow scintigraphy, because relevant parts of the haemopoietically active bone marrow are not accessible to visual evaluation. A significant role of the semiquantitative evaluation of MN3 Fab' bone marrow uptake in patients with potential marrow depression seems unlikely.
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Affiliation(s)
- V Ivancevic
- Department of Nuclear Medicine, University Hospital Charité, Humboldt University, Berlin, Germany.
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Boerman OC, Rennen H, Oyen WJ, Corstens FH. Radiopharmaceuticals to image infection and inflammation. Semin Nucl Med 2001; 31:286-95. [PMID: 11710771 DOI: 10.1053/snuc.2001.26189] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Scintigraphic imaging of infection and inflammation is a powerful diagnostic tool in the management of patients with infectious or inflammatory diseases. Most infectious and inflammatory foci can be visualized accurately with radiolabeled autologous leukocytes. However, the preparation of this radiopharmaceutical is laborious and requires the handling of potentially contaminated blood. A few radiopharmaceuticals are available that could be used instead of radiolabeled leukocytes to scintigraphically visualize infectious and inflammatory foci, such as 67Ga-citrate and 99mTc-labeled antigranulocyte antibody preparations. Various agents labeled with 99mTc are currently developed for this application. Most of these newly developed agents are ligands that bind receptors on white blood cell subpopulations, ie, monoclonal antibodies, chemotactic peptides, and cytokines. Furthermore, agents are developed that potentially could distinguish between infection and nonmicrobial inflammation. In addition, 18F-fluorodeoxyglucose positron emission tomography imaging was proposed to visualize inflammatory foci when a high spatial resolution is required. In this article, the characteristics and diagnostic potential of established and experimental radiopharmaceuticals for infection and inflammation imaging are reviewed.
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Affiliation(s)
- O C Boerman
- Department of Nuclear Medicine, University Medical Center Nijmegen, The Netherlands
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Abstract
Clinical findings are still the mainstay for suspecting the diagnosis of musculoskeletal infections, especially osteomyelitis. No single complementary imaging technique has 100% specificity and sensitivity for every case of musculoskeletal infection. Depending on the age of the patient, presence of orthopedic hardware, location of infection, underlying bone, and systemic conditions, the choice of imaging modalities must be tailored to the patient's condition. Plain radiographs are performed first and may be sufficient. In children, bone scan is highly accurate to diagnose osteomyelitis. Labeled leukocytes with complementary bone or bone marrow studies are recommended for orthopedic hardware or diabetic foot. Finally, gallium scanning is useful for the diagnosis of vertebral osteomyelitis. Current radiopharmaceuticals used for diagnosing infection also label inflammation. Newer products, as Infecton, should in the future allow better differentiation between infection and sterile inflammation.
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Affiliation(s)
- S Turpin
- Department of Medical Imaging, Montréal Children's Hospital, Québec, Canada
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Abstract
Foot infections are a common and serious problem in diabetic patients. They usually occur as a consequence of a skin ulceration, which initially is colonized with normal flora, and later infected with pathogens. Infection is defined clinically by evidence of inflammation, and appropriate cultures can determine the microbial etiology. Aerobic gram-positive cocci are the most important pathogens; in chronic, complex or previously treated wounds, gram-negative bacilli and anaerobes may join in a polymicrobial infection. In all diabetic foot infections a primary consideration is whether or not surgical intervention is required, e.g. for undrained pus, wound debridement or revascularization. Antibiotic regimens are usually selected empirically initially, then modified if needed based on results of culture and sensitivity tests and the patient's clinical response. Initial therapy, especially in serious infections, may need to be broad-spectrum, but definitive therapy can often be more targeted. Severe infections usually require intravenous therapy initially, but milder cases can be treated with oral agents. Treatment duration ranges from 1-2 weeks (for mild soft tissue infection) to more than 6 weeks (for osteomyelitis). The choice of a specific agent should be based on the usual microbiology of these infections, data from published clinical trials, the severity of the patient's infection, and the culture results. Extension of infection into underlying bone can be difficult to diagnose and may require imaging tests, e.g. magnetic resonance scans. Cure of osteomyelitis usually requires resection of infected bone, but can be accomplished with prolonged antibiotic therapy. Various non-antimicrobial adjunct therapies may sometimes be helpful. Published in 2000 by John Wiley & Sons, Ltd.
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Affiliation(s)
- B A Lipsky
- University of Washington, School of Medicine, Seattle, USA.
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