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An evidence-based clinical guideline for the diagnosis and management of Paget\'s disease of bone (PDB) was developed using GRADE methodology, by a Guideline Development Group (GDG) led by the Paget\'s Association (UK). A systematic review of diagnostic tests and pharmacological and nonpharmacological treatment options was conducted that sought to address several key questions of clinical relevance. Twelve recommendations and five conditional recommendations were made, but there was insufficient evidence to address eight of the questions posed. The following recommendations were identified as the most important: 1) Radionuclide bone scans, in addition to targeted radiographs, are recommended as a means of fully and accurately defining the extent of metabolically active disease in patients with PDB. 2) Serum total alkaline phosphatase (ALP) is recommended as a first-line biochemical screening test in combination with liver function tests in screening for the presence of metabolically active PDB. 3) Bisphosphonates are recommended for the treatment of bone pain associated with PDB. Zoledronic acid is recommended as the bisphosphonate most likely to give a favorable pain response. 4) Treatment aimed at improving symptoms is recommended over a treat-to-target strategy aimed at normalizing total ALP in PDB. 5) Total hip or knee replacements are recommended for patients with PDB who develop osteoarthritis in whom medical treatment is inadequate. There is insufficient information to recommend one type of surgical approach over another. The guideline was endorsed by the European Calcified Tissues Society, the International Osteoporosis Foundation, the American Society of Bone and Mineral Research, the Bone Research Society (UK), and the British Geriatric Society. The GDG noted that there had been a lack of research on patient-focused clinical outcomes in PDB and identified several areas where further research was needed. © 2019 The Authors. Journal of Bone and Mineral Research Published by Wiley Periodicals Inc.

Paget\'s disease of bone (osteitis deformans) is a benign focal disorder of accelerated skeletal remodeling. Either a single bone (monostotic) or multiple bones (polyostotic) can be affected. In patients with suspected Paget\'s disease plain radiographs of the suspicious regions of the skeleton are recommended. The initial biochemical evaluation of a patient should be done using serum total ALP (alkaline phosphatase) or with the use of a more specific marker of bone formation: PINP (intact N-terminal type 1 procollagen propeptide) or CTX (cross-linked C‑telopeptide). Treatment with a bisphosphonate is recommended for most patients with active Paget\'s disease who are at risk for further skeletal and extraskeletal complications. A single dose of 5 mg i.v. zoledronate as the treatment of choice in patients without contraindications is suggested. Oral bisphosphonates are less potent when compared to zoledronate. Treatment with an antiresorptive agent induces a more rapid decrease in resorption markers compared to formation marker. Measurement of total ALP or other baseline disease activity markers (e. g. CTX) at 6 to 12 weeks, when bone turnover will have shown a substantial decline, is an acceptable and cost-effective option. Maximum suppression of high bone turnover may require measurement at 6 months after administration. In patients with increased bone turnover, biochemical follow-up is recommended to be used as a more objective indicator of relapse rather than symptoms. The prolonged response after zoledronate treatment should be assessed every 1-2 years after normal bone turnover. With less potent drugs, every 6 to 12 months is appropriate.

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OBJECTIVE: The aim of this guideline was to formulate practice guidelines for the diagnosis and treatment of Paget\'s disease of the bone.
METHODS: The guideline was developed by an Endocrine Society-appointed Task Force of experts, a methodologist, and a medical writer.
METHODS: This evidence-based guideline was developed using the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) system to describe both the strength of recommendations and the quality of evidence.
METHODS: One group meeting, several conference calls, and e-mail communications enabled consensus. Committees and members of The Endocrine Society and the European Society of Endocrinology reviewed and commented on preliminary drafts of these guidelines. Two systematic reviews were conducted to summarize supporting evidence.
CONCLUSIONS: We recommend that plain radiographs be obtained of the pertinent regions of the skeleton in patients with suspected Paget\'s disease. If the diagnosis is confirmed, we suggest that a radionucleotide bone scan be done to determine the extent of the disease. After diagnosis of Paget\'s disease, we recommend measurement of serum total alkaline phosphatase or, when warranted, a more specific marker of bone formation or bone resorption to assess the response to treatment or evolution of the disease in untreated patients. We suggest treatment with a bisphosphonate for most patients with active Paget\'s disease who are at risk for future complications. We suggest a single 5-mg dose of iv zoledronate as the treatment of choice in patients who have no contraindication. In patients with monostotic disease who have a normal serum total alkaline phosphatase, we suggest that a specific marker of bone formation and bone resorption be measured, although these may still be normal. Serial radionuclide bone scans may determine the response to treatment if the markers are normal. We suggest that bisphosphonate treatment may be effective in preventing or slowing the progress of hearing loss and osteoarthritis in joints adjacent to Paget\'s disease and may reverse paraplegia associated with spinal Paget\'s disease. We suggest treatment with a bisphosphonate before surgery on pagetic bone.

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