Browsing by keyword "Calcitonin"
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Compliance with pharmacologic therapy for osteoporosisThere is little information available concerning compliance with pharmacologic therapy for osteoporosis in the usual care setting. We evaluated 176 consecutive, previously untreated women whose physicians initiated treatment for osteoporosis following a bone mineral density (BMD) test obtained as part of routine medical practice. All patients were contacted >/=1 year after the initial BMD test and offered a follow-up BMD. Compliance with therapy was defined as the percent of time that a patient filled a prescription for osteoporosis treatment. Ninety-three (53%) patients received estrogen (ERT), 93 (53%) bisphosphonates, 8 (5%) calcitonin, and 17 (10%) received more than one therapy. Ninety-one of the 176 (52%) agreed to a follow-up BMD at a mean of 590 days after the first study (participants); 85 declined a follow-up BMD (refusers). Participants and refusers were similar for age, treatment patterns, and compliance with therapy. For all patients, compliance for those given bisphosphonate was similar to those given ERT (70.7% (95% CI 63.5-77.9%) versus 69.2% (95% CI 61.7-76.8%). For participants, the change in spine BMD was similar for those treated with bisphosphonate [mean increase 3.53 (+/-2.64)%/year (mean+/-SD)] and those treated with ERT [mean increase 3.00 (+/-2.75)%/year]. For those participants whose compliance with therapy was >/=66%, the mean increase in spine bone density was 3.80 (+/-2.59)%/year compared to 2.11 (+/-2.64)%/year ( p<0.005) for those whose compliance was <66%. Compliance with ERT and bisphosphonate therapy initiated in routine practice after a BMD was similar over a mean of 590 days. Compliance less than 66% with drug treatment results in suboptimal improvement in bone density.
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Low frequency of treatment of osteoporosis among postmenopausal women following a fractureBACKGROUND: Osteoporosis is a major cause of morbidity. Treatment of osteoporosis reduces the risk of fracture, particularly for postmenopausal women with a history of fracture. METHODS: A retrospective study was conducted using the automated databases of 7 health maintenance organizations to evaluate the use of drugs recommended for secondary prevention of osteoporotic fracture. Women 60 years and older with an inpatient or outpatient diagnostic code for a fracture of the hip, vertebra, or wrist between October 1, 1994, and September 30, 1996, and at least 1 year of continuous enrollment with a drug benefit plan following the date of fracture, were identified. The frequency of use of medications for the treatment of osteoporosis (estrogen replacement therapy, bisphosphonates, and calcitonin) during the 1-year period following the date of the initial fracture was estimated overall and according to patient age, fracture site, and year of fracture. RESULTS: During the study period, 3492 women 60 years and older were diagnosed with a fracture of the hip, vertebra, or wrist, and met the inclusion criteria. Of these patients, 822 (24%) received a drug for osteoporosis treatment during the year following the fracture. The proportion of women receiving treatment for osteoporosis was approximately 2-fold higher among those with a fracture of the vertebra (44%) than among those with a fracture of the hip (21%) or wrist (23%) (P<.001). Of the 2605 women who had not been treated for osteoporosis in the 90 days before a fracture, 14% received treatment for osteoporosis in the year following a fracture. Increasing age was associated with a reduced likelihood of receiving osteoporosis treatment (P<.001). CONCLUSIONS: Most of the older women who had experienced a fracture of the hip, vertebra, or wrist did not receive drug treatment for osteoporosis within 1 year following the fracture. Interventions to improve the detection and treatment of osteoporosis in high-risk patients need to be developed.
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Pertussis toxin blocks the inhibitory effects of calcitonin on cyclic AMP accumulation in stimulated cultured human monocytesSurface stimulation of fresh or cultured human mononuclear cells by latex particles causes an increase in the accumulation of cyclic AMP that is inhibited by preincubation with calcitonin (CT). Preincubation of cultured monocytes with 500 ng/ml pertussis toxin totally blocks the inhibitory effects of CT at low concentrations of this hormone. The effects of pertussis toxin are dose-related and eliminated by boiling the toxin. Similar preincubations with cholera toxin have no significant effects on subsequent inhibition of surface-stimulated cyclic AMP by CT. Membranes prepared from cultured human monocytes contain a 41,000-dalton protein that is ADP-ribosylated by pertussis toxin and may be the inhibitory guanine nucleotide regulatory protein (Ni) mediating this inhibition.
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Prevalence and predictors of osteoporosis treatment in nursing home residents with known osteoporosis or recent fractureSummary: We studied nursing home residents with osteoporosis or recent fracture to determine the frequency and predictors of osteoporosis treatment. There was wide variation in performance, and both clinical and systems variables predicted use. This study shows that improvement in osteoporosis care is possible and important for many nursing homes. INTRODUCTION: We determined the prevalence and predictors of osteoporosis evaluation and treatment in high-risk nursing home residents. METHODS: We identified 67 nursing facilities in North Carolina and Arizona with > 10 residents with osteoporosis or recent hip fracture. Medical records (n=895) were abstracted for osteoporosis evaluation [dual-energy X-ray absorptiometry (DXA), vitamin D level, serum calcium), treatment (calcium, vitamin D, osteoporosis medication, hip protectors), clinical, and systems covariates. Data were analyzed at the facility level using mixed models to account for the complex nesting of residents within providers and nursing facilities. RESULTS: Calcium and vitamin D was prescribed for 69% of residents, bisphosphonates for 19%, calcitonin for 14%, other pharmacologic therapies for 6%, and hip protectors for 2%. Overall, 36% received any bone protection (medication or hip protectors), with wide variation among facilities (0-85%). Factors significantly associated with any bone protection included female gender [odds ratio (OR) 2.4, (1.5-3.7)] and nonurban/suburban location [1.5, (1.1-2.2)]. Residents with esophagitis, peptic ulcer disease (PUD), or dysphagia [0.6, (0.4-0.9)] and alcohol abuse [0.2, (0.0-0.9)] were less likely to receive treatment. CONCLUSIONS: There is substantial variation in the quality of osteoporosis treatment across nursing homes. Interventions that improve osteoporosis quality of care are needed.
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Responsiveness of gene expression markers of osteoblastic and osteoclastic activity to calcitonin in the appendicular and axial skeleton of the rat in vivoWe have previously shown that calcitonin (CT), an inhibitor of bone resorption, increases vertebral, but not femoral bone density in the rat. To address the physiologic responses associated with these effects on bone mineral density (BMD), we assessed mRNA transcripts reflecting activities of osteoblasts (type I collagen, osteocalcin, osteopontin, and alkaline phosphatase), osteoclasts [tartrate-resistant acid phosphatase (TRAP)], and cell proliferation (histone H4) in the spine and femur of these rats. CT increased spine BMD while increasing type I collagen and decreasing TRAP and histone mRNAs. In the femur, where CT had no effect on BMD, it decreased type I collagen and histone H4 mRNA but did not affect TRAP. CT had no effect on the gene expression of osteocalcin, osteopontin, or alkaline phosphatase at either site. The results indicate that selective alterations in gene expression, as reflected by steady state mRNA levels, are consistent with the changes observed by BMD measurement, and can more clearly define the specific contribution from osteoblast and osteoclast activity. This study demonstrates a heterogeneity in response of the axial and appendicular skeleton to CT, reflected by alterations in gene expression that provide a basis for understanding the observed BMD responses to various pharmacologic interventions.
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Serum procalcitonin in systemic autoimmune diseases--where are we nowOBJECTIVES: To review the current evidence regarding the value of measuring procalcitonin (PCT) levels in patients with systemic autoimmune diseases, with a focus on the evidence for diagnostic and analytical performance of this biomarker. A brief description of the pathophysiological basis of this biomarker is also included. METHODS: Using PubMed from the National Library of Medicine, relevant English literature on PCT in patients with different systemic autoimmune diseases, from 1990 to 2009, was reviewed. The search used keywords referring to procalcitonin and systemic lupus erythematosus, antineutrophil cytoplasmic antibody-associated systemic vasculitis, Goodpasture syndrome, rheumatoid arthritis, and giant cell arteritis. RESULTS: When used in the appropriate clinical setting, the measurement of serum PCT levels is valuable as a marker of severe systemic bacterial and fungal infections and sepsis. Information regarding plasma PCT levels in patients with active underlying systemic autoimmune diseases is limited, primarily from observational studies and case series, with considerable variability of patient characteristics and clinical settings. In the detection of systemic infection concomitant with autoimmune diseases, PCT had a diagnostic sensitivity of 53 to 100% and a specificity of 84 to 97% (depending on the selection criteria) and was superior to other inflammatory markers tested. Most of the studies used a semiquantitative test for PCT measurement (functional assay sensitivity <0.5 ng/mL), which can explain the low sensitivity of the test. PCT levels were not significantly affected by renal function abnormalities or immunosuppressive agents. Although high PCT levels commonly occurred with infection, elevated levels of PCT could be found in patients with vasculitis without evidence of infection, often correlated with high disease activity scores. CONCLUSIONS: Significantly elevated PCT levels offer good specificity and sensitivity for systemic infection in patients with systemic autoimmune diseases, regardless of the use of corticosteroids or immunosuppressive agents. PCT measurement may add to diagnostic accuracy in patients with systemic autoimmune diseases who present with a febrile illness, especially when highly sensitive PCT assays and specific PCT cutoff ranges are used in a predefined clinical setting (reflecting the likelihood of infection versus an autoimmune disease flare). However, there are limitations when using this biomarker in patients with systemic autoimmune diseases. PCT levels should not replace the necessary extensive diagnostic workup, which should include a thorough history and physical examination, combined with appropriate immunological, microbiological, radiological, and histological data.