Hani Jneid, MD

• Division of Cardiology
• Massachusetts General Hospital
• and Harvard Medical School
• Boston, Massachusetts

The Tromsø heart study bacteria definition proven colchicine 0.5 mg, one of the earliest trials investigating the link between high vitamin D intake and myocardial infarction virus 9 million cheap 0.5 mg colchicine fast delivery, initially reported a causative role for vitamin D (Linden bacterial cell colchicine 0.5 mg buy online, 1974) virus scan online colchicine 0.5 mg with amex. With the calcium deficiency hypothesis of hypertension (McCarron and Morris virus fall 2014 generic colchicine 0.5 mg with amex, 1987) as its basis, an investigation of the effect of ultraviolet radiation on blood pressure by Krause et al. These findings have been reproduced in a number of other cross-sectional studies (Pilz et al. Similarly, insufficient vitamin D levels are associated with congestive cardiac failure, possibly through deranged intracellular calcium metabolism (Zittermann et al. A recent meta-analysis of 28 studies incorporating close to 100,000 participants found this figure to be as high as 57% for a cumulative outcome of cardiovascular disease, diabetes, and metabolic syndrome (Parker et al. It is therefore difficult to make accurate conclusions on cardiovascular protection from this study. A number of other cohort studies have shown a positive association between vitamin D deficiency and ischaemic heart disease (Giovannucci et al. However, pooled data from six randomized controlled trials was unable to show any effect on risk of myocardial infarction from vitamin D supplementation (Elamin et al. Vitamin D deficiency is associated with congestive cardiac failure (Rostand, 1997) and the role of vitamin D in heart failure has been comprehensively reviewed elsewhere (Covic et al. The relationship between the kidney and heart in failure of either organ is reciprocal and mutually detrimental (Ritz, 2009). Pilz and Tomaschitz have noted individual case reports of vitamin D-deficient children with dilated cardiomyopathy, suggesting that treatment with vitamin D might replicate these results in vivo (Pilz and Tomaschitz, 2009), although vitamin D deficiency rarely occurs in isolation and therefore other causative factors might contribute to the aetiology of cardiac abnormalities in these children. Vitamin D acts directly on cardiomyocyte structure and function, causing suppression of renin gene expression (Wang et al. Schematic diagram demonstrating progression of biochemical abnormalities with declining renal function and associated consequences in mineral bone disease and related cardiovascular complications. There are no large, controlled intervention studies of vitamin D supplementation in heart failure which have shown any functional, structural or haemodynamic benefit (Schleithoff et al. These findings were independent of other risk factors, and echo those of Zitterman et al. In conjunction with current understanding of the pathophysiology of heart failure, this association may be due to the effects of vitamin D on immune regulation in addition to its haemodynamic role, as discussed above (Hajjar et al. Vitamin D and vascular biology Endothelial dysfunction is an early insult in cardiovascular pathophysiology. Vitamin D deficiency has been associated with increased arterial stiffness and endothelial dysfunction, although supplementation studies to reverse these changes have been inconsistent. Not all studies, however, have shown positive effects of vitamin D on endothelial health. Another small, double-blind, randomized controlled trial of 24 patients piloted the effect of paricalcitol treatment on haemodynamic and biochemical factors (Alborzi et al. Investigators in Dundee have recently completed a number of clinical studies investigating vitamin D supplementation on cardiovascular health. In a double-blind, placebo-controlled trial of 75 patients with a history of myocardial infarction, patients were randomized to receive 100,000 units of oral vitamin D3 or placebo at baseline, 2 months, and 4 months (total dose of 300,000 units) (Witham et al. The primary outcome was endothelial function measured using reactive hyperaemia index on fingertip plethysmography, with 6 months of follow-up. The investigators proposed that the relatively high average age of participants (67 years) and history of cerebrovascular disease may reflect advanced, established vascular changes, which are more difficult to reverse. It should also be noted that > 80% of individuals were on an angiotensin blocking agent. Calcification of arterial intima and media are both independently predictive of all-cause and cardiovascular mortality (London et al. Low levels of vitamin D are associated with increased vascular stiffness (London et al. The resulting high serum phosphate levels have been associated with increased carotid intima­media thickness (Kuang et al. It is known that elevated phosphate induces changes in the phenotype of cultured vascular smooth muscle cells to osteoblast like cells, which can then deposit calcium in the vascular wall (El-Abbadi and Giachelli, 2007). This effect is dependent on a sodium-dependent phosphate co-transporter, Pit-1, that enables entry of phosphate into cells and is upregulated in uraemia and calcified arteries; abnormal function may increase the tendency to calcification (Chen et al. Although original animal studies described the promotion of arterial calcification by high doses of vitamin D (Mertens and Muller, 2010), recent trials on humans suggest the opposite. In a cross-sectional examination of 203 subjects from the Northern Manhattan Study (Carrelli et al. Another large prospective trial demonstrated that vitamin D levels were associated with increased risk of developing coronary artery calcification, after adjusting for a number of cardiovascular and metabolic covariates. Interestingly, this study showed no correlation between low levels of the vitamin D and prevalence of atherosclerosis (de Boer et al. A population-based cohort study suggests that low levels of vitamin D play a role in subclinical atherosclerotic plaque formation (Reis et al. There is currently inconsistent data on the effect of vitamin D on lipids (Gannage-Yared et al. In a supplementation trial in postmenopausal women, there was no associated improvement in lipid profile with calcium and vitamin D supplementation (Gannage-Yared et al. The study benefited from follow -p data on 72,719 women over 22-years, equating 2010). Vitamin D and immune-mediated pathology A number of studies support an anti-inflammatory role for vitamin D (Mathieu and Adorini, 2002; Tan et al. This is in keeping with epidemiological studies in humans demonstrating associations between vitamin D insufficiency and autoimmune diseases including type 1 diabetes (Hypponen et al. The significance of this in the cardiorenal nexus is the strong association between chronic inflammation and both cardiac and renal disease (Vidt, 2006; He et al. It is well recognized that vitamin D is an effective therapeutic tool for certain inflammatory conditions such as psoriasis (Thaci et al. In rats, treatment with active vitamin D results in improved graft survival after kidney transplantation (Redaelli et al. Vitamin D has been proposed as a potential therapy in other mycobacterial disease, including tuberculoid leprosy (Chaglassian, 1948). Tolerogenic dendritic cells induced by vitamin D receptor ligands enhance regulatory T cells inhibiting allograft rejection and autoimmune diseases. Disruption of nuclear vitamin D receptor gene causes enhanced thrombogenicity in mice. Vitamin D status is associated with arterial stiffness and vascular dysfunction in healthy humans. Paricalcitol reduces albuminuria and inflammation in chronic kidney disease: a randomized double-blind pilot trial. Association of low serum 25-hydroxyvitamin D levels and high arterial blood pressure in the elderly. Relation of vitamin D deficiency to cardiovascular risk factors, disease status, and incident events in a general healthcare population. Conclusions Although vitamin D has been known to medical science for almost a century, it is only in the last 15 -20 years that we have realized that the biological effects of vitamin D extend far beyond the control of calcium metabolism. Predictably therefore interest in this fascinating biological area has mushroomed with a plethora of laboratory, translational, and clinical studies appearing. Despite these efforts, many questions remain unanswered and challenges remain to be overcome, including the current lack of standardization of vitamin D assays, the complexity of the other related biological pathways with which vitamin D and its metabolites interact, and also the many genetic factors affecting the handling and activity of vitamin D in man. Although there are no definitive renal or cardiovascular guidelines on the subject matter, a number of consensus documents highlight the difficulty in justifying renal supplementation for potential non-skeletal benefits at the current time, in the absence of large, high-quality trial evidence. Dendritic cells from human tissues express receptors for the immunoregulatory vitamin D3 metabolite, dihydroxycholecalciferol. Vitamin D deficiency is associated with subclinical carotid atherosclerosis: the Northern Manhattan study. Phosphorus and uremic serum up-regulate osteopontin expression in vascular smooth muscle cells. Hypovitaminosis D is associated with insulin resistance and beta cell dysfunction. Prospective study of the association between serum antibodies to lipopolysaccharide O antigen and the attack rate of shigellosis. Effects of vitamin D supplementation on the calcium-phosphate balance in renal transplant patients. Systematic review of the evidence underlying the association between mineral metabolism disturbances and risk of all-cause mortality, cardiovascular mortality and cardiovascular events in chronic kidney disease. Vitamin D supplementation and total mortality: a meta-analysis of randomized controlled trials. Relation between 25-hydroxyvitamin D3, apolipoprotein A-I, and high density lipoprotein cholesterol. Vitamin D and vitamin D analogues for preventing fractures associated with involutional and post-menopausal osteoporosis. Vitamin D affects survival independently of vascular calcification in chronic kidney disease. Aliskiren-binding increases the half life of renin and prorenin in rat aortic vascular smooth muscle cells. Prevention of nonvertebral fractures with oral vitamin D and dose dependency: a meta-analysis of randomized controlled trials. Relationship between serum 25-hydroxyvitamin d and pulmonary function in the third national health and nutrition examination survey. The in vitro effect of 1 alpha,25-dihydroxyvitamin D3 on insulin production by neonatal rat islets. The relationship between hypertension and left ventricular hypertrophy in renal transplant recipients. Possible renoprotection by vitamin D in chronic renal disease: beyond mineral metabolism. T-cell cytokines differentially control human monocyte antimicrobial responses by regulating vitamin D metabolism. Plasma 25-hydroxyvitamin D and regulation of the renin-angiotensin system in humans. Parathyroid cell resistance to fibroblast growth factor 23 in secondary hyperparathyroidism of chronic kidney disease. Effects of a short-term calcium and vitamin D treatment on serum cytokines, bone markers, insulin and lipid concentrations in healthy post-menopausal women. Vitamin D in relation to metabolic risk factors, insulin sensitivity and adiponectin in a young Middle-Eastern population. A Prospective Randomized Controlled Trial of the Effects of Vitamin D Supplementation on Cardiovascular Disease Risk (Abstract). Expansion of antigen-specific regulatory T cells with the topical vitamin D analog calcipotriol. Prospective study of serum 25-hydroxyvitamin D level, cardiovascular disease mortality, and all-cause mortality in older U. Early C-reactive protein in the prediction of long-term outcomes after acute coronary syndromes: a meta-analysis of longitudinal studies. Blockade of Wnt/beta-catenin signaling by paricalcitol ameliorates proteinuria and kidney injury. Differential regulation of vitamin D receptor and its ligand in human monocyte-derived dendritic cells. Vitamin D status and glucose homeostasis in the 1958 British birth cohort: the role of obesity. Anti-apoptotic and anti-senescence effects of Klotho on vascular endothelial cells. Relationship between serum 1,25-dihydroxyvitamin D and mortality in patients with pre-dialysis chronic kidney disease. Alterations in vitamin D status and anti-microbial peptide levels in patients in the intensive care unit with sepsis. Molecular insights into the klotho-dependent, endocrine mode of action of fibroblast growth factor 19 subfamily members. Prevalence of vitamin D deficiency and its relationship with thyroid autoimmunity in Asian Indians: a community-based survey. Cod and the consumptive: a brief history of cod-liver oil in the treatment of pulmonary tuberculosis. Local inflammation and hypoxia abolish the protective anticontractile properties of perivascular fat in obese patients. Dendritic cell modulation by 1alpha,25 dihydroxyvitamin D3 and its analogs: a vitamin D receptor-dependent pathway that promotes a persistent state of immaturity in vitro and in vivo. Q: Does vitamin D deficiency play a role in the pathogenesis of chronic heart failure Vitamin D3 supplementation for 16 weeks improves flow-mediated dilation in overweight African-American adults. Gamma-interferon stimulates production of 1,25-dihydroxyvitamin D3 by normal human macrophages. Outcomes associated with serum calcium level in men with non-dialysis-dependent chronic kidney disease. Intima-media thickness of the carotid artery and its correlation factors in maintenance hemodialysis patients: a cross-sectional study. Immunolocalization of calcitriol receptor, 24-hydroxylase cytochrome P-450, and calbindin D28k in human kidney. Aortic stiffness is an independent predictor of all-cause and cardiovascular mortality in hypertensive patients. Oral calcitriol for reduction of proteinuria in patients with IgA nephropathy: a randomized controlled trial. Stimulation by 1,25-dihydroxyvitamin D3 of insulin receptor expression and insulin responsiveness for glucose transport in U-937 human promonocytic cells.

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In other words bacteria prokaryotic or eukaryotic discount 0.5 mg colchicine free shipping, until a wonder drug becomes available antibiotics quick guide buy cheap colchicine on line, most of the differences in outcome may well be related to the quality of care virus vector cheap 0.5 mg colchicine with mastercard, as in many other chronic diseases antibiotics given for ear infections colchicine 0.5 mg for sale. Follow-up must be obsessional antibiotics for acne oily skin colchicine 0.5 mg order with mastercard, following a standardized scheme and directly involving patients. Disease: Improving Global Outcomes) guidelines) blood pressure must be tightly controlled and maximal systolic/diastolic values should not exceed 120/80 mm Hg. Pivotal data by the Toronto group first pointed to a bimodal mortality pattern in lupus patients, with an early peak related to lupus itself and its therapy, and a second due to cardiovascular disease (Urowitz et al. This observation was largely confirmed by the formal demonstration of accelerated atheroma in lupus patients, as assessed by carotid Doppler studies (plaques and intima­media thickness) (Roman et al. In this respect, control of other cardiovascular risk factors is of the utmost importance, such as smoking avoidance, weight, exercise, and cholesterol levels. As for diabetes mellitus, we set the cut-off for treatment with a cholesterol-lowering drug as low as 115 mg/dL of low-density lipoprotein cholesterol. All lupus patients should be immunized against Streptococcus pneumoniae (Naveau and Houssiau, 2005), given the incidence and severity of the infections caused by this pathogen. The higher prevalence of uterine cervix carcinoma and human papillomavirus infection in lupus patients compared to a control population (Tam et al. Both tables do not strive for completeness, nor are they intended to serve as recommendations, such as those edited by the European League Against Rheumatism and the European Renal Association-European Dialysis and Transplant Association (Bertsias et al. Rather, they should highlight the critical issues that must be taken into account before making a decision at the bedside. Recurrence of lupus in the transplanted kidney is a surprisingly low event (< 5%) and is probably prevented by antirejection immunosuppressive therapy. Despite the many progresses described in this chapter, several needs remain unmet. Mycophenolate mofetil versus cyclophosphamide for induction treatment of lupus nephritis. Outcomes of renal transplantation for recipients with lupus nephritis: analysis of the Organ Procurement and Transplantation Network database. Prospective observational single center cohort study to evaluate the effectiveness of treating lupus nephritis with rituximab and mycophenolate mofetil but no oral steroids. Treatment of lupus nephritis with prednisone and combined prednisone and azathioprine. Efficacy and safety of abatacept in lupus nephritis: a 12-month, randomized, double-blind study. Methylprednisolone and cyclophosphamide, alone or in combination, in patients with lupus nephritis. Azathioprine/ methylprednisolone versus cyclophosphamide in proliferative lupus nephritis. Immunosuppressive therapy in lupus nephritis: the Euro-Lupus Nephritis Trial, a randomized trial of low-dose versus high dose intravenous cyclophosphamide. Early response to immunosuppressive therapy predicts good renal outcome in lupus nephritis: lessons from long-term followup of patients in the Euro-Lupus Nephritis Trial. The 10-year follow-up data of the Euro-Lupus Nephritis Trial comparing low-dose and high-dose intravenous cyclophosphamide. Systemic lupus erythematosus and peritoneal dialysis: outcomes and infectious complications. Efficacy and safety of tacrolimus therapy for lupus nephritis: a systematic review of clinical trials. Allogenic mesenchymal stem cells transplantation in refractory systemic lupus erythematosus: a pilot clinical study. Withdrawal of therapy in patients with proliferative lupus nephritis: long-term follow-up. Umbilical cord mesenchymal stem cell transplantation in severe and refractory systemic lupus erythematosus. Increased prevalence of squamous intraepithelial lesions in systemic lupus erythematosus: association with human papillomavirus infection. Mesenchymal stem cells for the treatment of multiple sclerosis and other neurological diseases. Mycophenolate mofetil or intravenous cyclophosphamide for lupus nephritis with poor kidney function: a subgroup analysis of the Asprava Lupus Management Study. Comparison of alternative primary outcome measures for use in a lupus nephritis trial. Efficacy and safety of belimumab in patients with active systemic lupus erythematosus: a randomized, placebo-controlled, phase 3 trial. Mutagenicity and potential carcinogenicity of thiopurine treatment in patients with inflammatory bowel disease. Mycophenolate mofetil and intravenous cyclophosphamide are similar as induction therapy for class V lupus nephritis. Efficacy and safety of rituximab in patients with active proliferative lupus nephritis: the Lupus Nephritis Assessment with Rituximab Study. In the past two decades, a variety of immunologically mediated thrombotic events related to almost every organ system have been identified as features of this syndrome (Ruiz-Irastorza et al. In a meta-analysis of 25 studies involving 7000 patients, the odd ratios for thrombosis was 11. Hypertension may be severe, with some patients presenting with hypertensive emergencies. According to this principle, the antibody (representing the first hit) induces a thrombophilic state, but clotting takes place only in the presence of another thrombophilic condition (the second hit), for example, infection or trauma (Willis et al. It may manifest in multiple ways ranging from renal infarction to ischaemic acute kidney injury to slowly progressive ischaemic chronic renal failure to renovascular disease. The less common pattern is similar to atherosclerotic lesions situated proximally and occasionally involving the aorta. The stenotic lesions often have both thrombotic and a reactive or proliferative components, with intimal mucoid thickening, subendothelial fibrosis, and medial hyperplasia. Renal infarction Renal infarction results from occlusive lesions in smaller diameter intraparenchymal vessels, caused by in situ thrombosis or emboli from a pre-existing proximal arterial or cardiac lesion. Patients with renal infarction present with flank pain, severe hypertension, and/or renal dysfunction. Some may have multiple, often serious, thrombotic episodes, and many have multiple infarctions in the renal cortex. The renal pathology in these patients is characterized by glomerular ischaemia, tubular atrophy, and interstitial fibrosis. Alternatively, contrast-enhanced computed tomography or magnetic resonance angiography can be used to provide the diagnosis. A glomerulus from a patient with positive antiphospholipid antibodies showing microangiopathic changes, including duplicated basement membranes, glomerular capillary thrombosis (seen in the afferent/efferent arteriole) with entrapment of fragmented erythrocytes. The mechanism underlying the formation of microthrombosis is largely unknown, but is likely to involve complement activation (Cohen et al. Whether or not patients with glomerular microthrombi should be treated with anticoagulants in the absence of other thrombotic processes remains an open question. It is not known to what extent these two conditions share a common genetic background. In the chronic phase, arteriosclerosis is associated with fibrocellular intimal hyperplasia of the arteries and arterioles, with consequent lumen restriction and ischaemia. This leads to focal zones of cortical atrophy in the superficial cortex, in which atrophic tubules packed with eosinophilic casts (tubular thyroidization) are often present. A non-thrombotic glomerular endothelial injury with a distinctive wrinkling and reduplication of the basement membrane has Catastrophic antiphospholipid syndrome. Renal arteriole from a patient with positive antiphospholipid antibodies showing intimal fibroplasia with re-canalized thrombus. Thrombotic microangiopathy can recur in the allograft and has responded to the complement C5 inhibitor eculizumab, indicating a role for complement in the pathogenesis of this lesion (Hadaya et al. Approximately 60% of the catastrophic episodes are preceded by a precipitating event, mainly infection. Causes of death include major organ involvement (other than the kidney) and infection (Bucciarelli et al. To improve the outcomes of pregnancies in such women, a closer obstetric surveillance and multidisciplinary clinics, including nephrologists, are essential. These antibodies were independent of age, length of time on dialysis, sex, type of dialysis membrane, drugs, and chronic B and C hepatitis (Brunet et al. Possible causes include dialysis membranes, trauma to blood passing through the haemodialysis circuit, and microbial contamination of the dialysate. Catastrophic antiphospholipid syndrome: international consensus statement on classification criteria and treatment guidelines. Nonthrombotic manifestations of the antiphospholipid syndrome: away from thrombosis Renal thrombotic microangiopathy associated with anticardiolipin antibodies in hepatitis C-positive renal allograft recipients. Antiphospholipids in hemodialysis patients: relationship between lupus anticoagulant and thrombosis. Antiphospholipid antibodies and increased bleeding complications following renal biopsy: a single centre study. Potential for glomerular C4d as an indicator of thrombotic microangiopathy in lupus nephritis. Prevalence and clinical significance of antiphospholipid antibodies in renal transplant recipients. The expanding spectrum of renal diseases associated with antiphospholipid syndrome. Significance of anticardiolipin antibodies on short and long term allograft survival and function following kidney transplantation. The renal pathology of primary antiphospholipid syndrome: a distinctive form of endothelial injury. Eculizumab in acute recurrence of thrombotic microangiopathy after renal transplantation. IgM anti-ß2 glycoprotein I is protective against lupus nephritis and renal damage in systemic lupus erythematosus. The intrarenal vascular lesions associated with primary antiphospholipid syndrome. The utility of the Taipan snake venom assay in assessing lupus anticoagulant status in individuals receiving or not receiving an oral vitamin K antagonist. Renal artery stenosis in hypertensive patients with antiphospholipid (Hughes) syndrome: outcome following anticoagulation. Association between anti-beta2 glycoprotein I antibodies and renal glomerular C4d deposition in lupus nephritis patients with glomerular microthrombosis: a prospective study of 155 cases. Antiphospholipid syndrome and systemic lupus erythematosus: are they separate entities or just clinical presentations on the same scale Antiphospholipid syndrome nephropathy in patients with systemic lupus erythematosus and antiphospholipid antibodies: prevalence, clinical associations, and long-term outcome. Antiphospholipid antibody profiles in lupus nephritis with glomerular microthrombosis: a prospective study of 124 cases. Renal involvement in primary antiphospholipid syndrome: retrospective analysis of 160 patients. Antiphospholipid antibody syndrome in renal transplantation: occurrence of clinical events in 96 consecutive patients with systemic lupus erythematosus. The typical clinical features of scleroderma are well described and illustrated in. The histological hallmark is excess collagen deposition around capillaries in the skin. Other internal organs including lungs, heart, gastrointestinal tract, as well as kidneys may also be affected and these often determine prognosis. The disease is more common in women usually presenting between the ages of 30 and 60 years. Skin changes usually begin in the fingers (sclerodactyly) and may progress rapidly to involve arms, face, anterior chest wall, lower limbs, and abdomen. Microstomia and xerostomia (as part of a more generalized sicca syndrome) are often present together with poor dentition and dysphagia resulting from both dry mouth and oesophageal dysmotility (Dedic et al. Lung involvement may be in the form of pulmonary fibrosis and/or pulmonary hypertension. Restrictive cardiomyopathy and right heart failure secondary to pulmonary hypertension are well recognized. Small pericardial effusions are frequently identified but larger compromising effusions have also been reported. In addition to the problems with oesophageal dysmotility, gastrointestinal symptoms are common with abdominal discomfort, bloating, and constipation predominating. Poor dentition resulting from microstomia (which makes dental work difficult) and reduced saliva production is frequent. Small bowel bacterial overgrowth, large bowel diverticula (but uncommonly diverticulitis), and malabsorption complete the clinical spectrum. However, the terminology used to describe the extent and location of the skin changes can be confusing and is summarized in Table 165. Historically, both angiography and histopathology of larger blood vessels (including intrarenal vessels) clearly demonstrate narrowing, tapering, and occlusion. Pathologically, similar vascular changes are recognized in the kidney and may be present without either hypertension or abnormal biochemistry (Leinwand et al. Renal involvement in scleroderma For well over a century, renal involvement in scleroderma has been known to occur. Survival even in a tertiary referral centre was reported to be < 20% (Moore and Sheehan, 1952). By the mid 1970s, there were isolated reports of prolonged survival following bilateral nephrectomies and initiation of chronic dialysis (Shapiro et al.

No head-to-head comparisons of different vitamin D analogues have evaluated patient-related outcomes virus update flash player buy generic colchicine 0.5 mg online. In other words antibiotics for acne pregnancy colchicine 0.5 mg fast delivery, clinical symptomatology (including pruritus bacteria with capsules order colchicine mastercard, joint and bone pain antimicrobial keratolytic purchase colchicine from india, and muscle weakness) is expected to improve antibiotic resistance in animals order colchicine 0.5 mg with mastercard. Longer-term poor control of hyperparathyroidism can accelerate vascular and other ectopic calcifications, contribute to hypertension and dyslipidaemia, and can also lead to bone fractures and tendon ruptures. A prospective observational study found that cinacalcet treatment was associated with improved survival in haemodialysis patients (Block et al. All patients were eligible to receive conventional therapy, including P binders, vitamin D sterols, or both. The results of the trial need to be interpreted in the light of intention-to-treat analysis, which was complicated by the fact that almost 20% of patients in the placebo group began receiving commercial cinacalcet before the occurrence of a primary event. Using a lag sensoring analysis to try to account for this issue appears to suggest that mortality was significantly reduced in the cinacalcet group. Accordingly, these studies should be regarded as non-definitive rather than negative. However, it must be underlined that no precise biochemical value or clinical criteria can be considered as absolute. Intra-operative neck hyperextension may result in medullary spine compression in cases of degenerative cervical arthropathy. Furthermore, in less than expert hands or with highly complex patients, there is the risk of neck tissue, recurrent laryngeal, or phrenic nerve lesions. Given the high risk of ectopic or supernumerary glands in renal patients (Tominaga et al. Scanning for metabolically active (high blood flow) parathyroid tissue may be of value and is certainly of value in re-operations. The results obtained with these methods are still inconclusive (once again, no good evidence base exists, so careful thought is needed about locally available medical and surgical options). Clinical Severe pruritus, muscular and osteo-articular pain, bone demineralization, fractures, accelerated vascular calcifications, calciphylaxis, peripheral calcifying uraemic arteriolopathy, erythropoietin-resistant anaemia, unexplained cardiomyopathy, or heart failure Intolerance or allergy to calcimimetics at active doses Extreme parathyroid gland dimensions (volume > 500 mm3, diameter > 1000 mm, or estimated weight > 500 mg) Parathyromatosis. Imaging techniques that can be considered prior to surgery, and certainly should be considered seriously prior to re-operations, include neck ultrasound, neck and cervical magnetic resonance scanning, computed tomography scanning, and nuclear scintigraphy. Local factors, including discussion with the local surgical team, will determine the best investigative approach. However, while serum Ca and P drop significantly in > 95% of patients (Urena et al. Moreover, as for survival rate, the available studies indicating possible advantages are observational and may suffer significant biases, not allowing firm conclusions to be drawn about survival advantage (Kestenbaum et al. Cinacalcet hydrochloride treatment significantly improves all-cause and cardiovascular survival in a large cohort of hemodialysis patients. Treatment of secondary hyperparathyroidism with ultrasonographically guided percutaneous radiofrequency thermoablation. Poly[allylamine hydrochloride] (RenaGel): a noncalcemic P binder for the treatment of hyperphosphatemic in chronic renal failure. Lanthanum carbonate (Fosrenol) efficacy and tolerability in the treatment of hyperphosphatemic patients with end-stage renal disease. Parathyroidectomy in chronic renal failure: short- and long-term results on parathyroid function, blood pressure and anemia. Natural history of parathyroid function and calcium metabolism after kidney transplantation: a single-centre study. Efficacy and safety of lanthanum carbonate for reduction of serum P in patients with chronic renal failure receiving hemodialysis. Short- and long-term efficacy of total parathyroidectomy with immediate autografting compared with subtotal parathyroidectomy in hemodialysis patients. Ultrasonically guided fine-needle alcohol injection as an adjunct to medical treatment in secondary hyperparathyroidism. Predictably, this would avoid long-term medical management with its possible side effects, and, in the case of calcimimetics, considerable medical costs. Ultrasound-guided laser thermal ablation for parathyroid adenomas: analysis of three cases with a three-year follow-up. Lanthanum carbonate (Fosrenol): a novel agent for the treatment of hyperphosphataemia in renal failure and dialysis patients. Effects of short daily versus conventional hemodialysis on left ventricular hypertrophy and inflammatory markers: a prospective, controlled study. Peritoneal P clearance is influenced by peritoneal dialysis modality, independent of peritoneal transport characteristics. Minimally invasive video-assisted subtotal parathyroidectomy with thymectomy for secondary hyperparathyroidism. High alkaline phosphatase levels in hemodialysis patients are associated with higher risk of hospitalization and death. Mortality effect of coronary calcification and P binder choice in incident hemodialysis patients. Effects of sevelamer and Ca on coronary artery calcification in patients new to hemodialysis. Lanthanum carbonate treatment, for up to 6 years, is not associated with adverse effects on the liver in patients with chronic kidney disease Stage 5 receiving hemodialysis. Bone mass and dynamic parathyroid function according to bone histology in nondialyzed uremic patients after long-term protein and P restriction. Improvements in renal osteodystrophy in patients treated with lanthanum carbonate for two years. The importance of dietary Ca and phosphorous in the secondary hyperparathyroidism of patients with early renal failure. Efficacy and side effects of intermittent intravenous and oral doxercalciferol (1alpha-hydroxyvitamin D(2)) in dialysis patients with secondary hyperparathyroidism: a sequential comparison. Parathyroidectomy in secondary hyperparathyroidism: is there an optimal operative management Changes in blood pressure and renal function after subtotal parathyroidectomy in renal transplant patients presenting persistent hypercalcemic hyperparathyroidism. Aluminum accumulation during treatment with aluminum hydroxide and dialysis in children and young adults with chronic renal disease. More than 1,000 cases of total parathyroidectomy with forearm autograft for renal hyperparathyroidism. Failure of dietary protein and P restriction to retard the rate of progression of chronic renal failure: a prospective, randomized, controlled trial. Evolution of bone and plasma concentration of lanthanum in dialysis patients before, during 1 year of treatment with lanthanum carbonate and after 2 years of follow-up. Effects of sevelamer and Ca-based P binders on mortality in hemodialysis patients. Combination therapy of intravenous maxacalcitol and percutaneous ethanol injection therapy lowers serum parathyroid hormone level and calcium x phosphorus product in secondary hyperparathyroidism. Gutiérrez Introduction Phosphorus (P) is an essential micronutrient involved in a number of critical biological processes including bone metabolism, energy transfer, and intracellular signalling. Systemic P homeostasis is tightly regulated through a dynamic balance between dietary P absorption, urinary P excretion, and exchanges with bone, soft tissue, and intracellular stores. Further, overexpression of fgf23 in animal models recapitulated the biochemical and metabolic derangements characteristic of these conditions (Shimada et al. Increased dietary P that is most highly expressed in the kidney and parathyroid glands (discussed in greater detail below) (Urakawa et al. Together, these actions appear to serve the primary purpose of maintaining phosphorus homeostasis in states of phosphorus excess (like chronic kidney disease) by enhancing urinary phosphate excretion and decreasing intestinal phosphorus absorption via lower 1,25-dihydroxyvitamin D concentrations. Klotho Klotho is a key regulator of mineral metabolism, glucose homeostasis, and endothelial function. Klotho exists in two forms, a transmembrane form and a circulating form, each with distinct functions. The secreted form has systemic effects modulating P and Ca metabolism (Chang et al. In an attempt to develop a transgenic mouse model overexpressing the rabbit type-I sodium-proton exchanger, an exogenous transgene was accidentally inserted within the promoter region of what was later discovered to be the klotho gene (Kuro-o et al. Mice with this insertional mutation developed a phenotype strongly resembling human ageing, characterized by growth retardation, inactivity, osteoporosis, arteriosclerosis, dystrophic calcification, and skin atrophy, among other age-related phenomena (Kuro-o et al. In addition, affected mice exhibited increased serum concentrations of Ca and P and hypoglycaemia (Kuro-o et al. Both the transmembrane and secreted forms of Klotho appear to be expressed primarily in the brain, the kidney, and the parathyroid glands (Kuro-o et al. Role of Klotho in P, Ca, and vitamin D metabolism Both the transmembrane and secreted forms of Klotho have important and sometimes overlapping roles in the regulation of mineral metabolism. The cleavage of Klotho is stimulated by a number of factors including insulin and peroxisome proliferator-activated receptor gamma. Indeed, klotho is primarily expressed in the kidney and parathyroid glands (Kuro-o et al. In an ischaemia-reperfusion model of acute kidney injury, plasma and urine levels of Klotho decreased after the induction of kidney injury in rats and then returned to baseline levels with recovery of kidney function, suggesting that decreased expression of Klotho in response to kidney injury may be reversible (Hu et al. Beyond its effects on mineral metabolism, there is growing evidence that Klotho may also have important renoprotective properties. The importance of this action was demonstrated in Klotho-deficient mice which exhibited markedly reduced vasodilation in response to acetylcholine challenge as compared to wild-type controls (Saito et al. Importantly, parabiosis between wild-type and heterozygous klotho mice restored endothelial function in the Klotho-deficient animals, confirming the critical role of circulating Klotho in maintaining endothelial health (Saito et al. The finding that Klotho-deficient mice developed hypoglycaemia despite very low circulating insulin concentrations led to the recognition that Klotho also has important sensitizing effects on insulin action (Kuro-o et al. Furthermore, insulin stimulates the shedding of Klotho into the circulation (Chen et al. Whether these actions contribute to the anti-ageing properties of Klotho is possible (Kurosu et al. Downregulation of the Klotho gene in the kidney under sustained circulatory stress in rats. Dietary phosphorus regulates serum fibroblast growth factor-23 concentrations in healthy men. Decreased renal alpha-Klotho expression in early diabetic nephropathy in humans and mice and its possible role in urinary calcium excretion. The autosomal dominant hypophosphatemic rickets R176Q mutation in fibroblast growth factor 23 resists proteolytic cleavage and enhances in vivo biological potency. Brief report: inhibition of renal phosphate transport by a tumor product in a patient with oncogenic osteomalacia. Fibroblast growth factor-23 relationship to dietary phosphate and renal phosphate handling in healthy young men. Fibroblast growth factor-23 mitigates hyperphosphatemia but accentuates calcitriol deficiency in chronic kidney disease. Klotho: a novel phosphaturic substance acting as an autocrine enzyme in the renal proximal tubule. Klotho deficiency is an early biomarker of renal ischemia-reperfusion injury and its replacement is protective. Involvement of alpha-klotho and fibroblast growth factor receptor in the development of secondary hyperparathyroidism. A novel recessive mutation in fibroblast growth factor-23 causes familial tumoral calcinosis. Immunohistochemical localization of Klotho protein in brain, kidney, and reproductive organs of mice. Vascular Klotho deficiency potentiates the development of human artery calcification and mediates resistance to fibroblast growth factor 23. Fibroblast growth factor 23 is a counter-regulatory phosphaturic hormone for vitamin D. Direct and indirect effects of parathyroid hormone on circulating levels of fibroblast growth factor 23 in vivo. Identification of the human klotho gene and its two transcripts encoding membrane and secreted klotho protein. Fibroblast growth factor 23 in oncogenic osteomalacia and X-linked hypophosphatemia. Regulation of intestinal Na+-dependent phosphate co-transporters by a low-phosphate diet and 1,25-dihydroxyvitamin D3. Sevelamer hydrochloride and calcium bicarbonate reduce serum fibroblast growth factor 23 levels in dialysis patients. Endothelial dysfunction in the klotho mouse and downregulation of klotho gene expression in various animal models of vascular and metabolic diseases. Inactivation of klotho function induces hyperphosphatemia even in presence of high serum fibroblast growth factor 23 levels in a genetically engineered hypophosphatemic (Hyp) mouse model. Persistent alpha-Klotho (a-Kl) expression in the parathyroid glands of patients with secondary hyperparathyroidism. Dietary and serum phosphorus regulate fibroblast growth factor 23 expression and 1,25-dihydroxyvitamin D metabolism in mice. Interactions between calcium and phosphorus in the regulation of the production of fibroblast growth factor 23 in vivo. In vivo klotho gene delivery protects against endothelial dysfunction in multiple risk factor syndrome. Bone formation regulates circulating concentrations of fibroblast growth factor 23. Fibroblast growth factor 23 is not associated with and does not induce arterial calcification. Structure of the mouse klotho gene and its two transcripts encoding membrane and secreted protein. Circulating fibroblast growth factor-23 increases following intermittent parathyroid hormone (1-34) in postmenopausal osteoporosis: association with biomarker of bone formation. Decreased insulin production and increased insulin sensitivity in the klotho mutant mouse, a novel animal model for human aging.

However virus 68 map colchicine 0.5 mg with amex, renal tubular epithelial cells seem to be more radiosensitive than epithelial cells from other tissues (Krochak and Baker infection control nurse certification purchase colchicine 0.5 mg otc, 1986) bacteria 7th grade science 0.5 mg colchicine buy overnight delivery. The exact threshold of radiation beyond which radiation nephropathy occurs is yet to be determined antibiotic nclex questions buy colchicine 0.5 mg low price. In rodent models bacteria reproduce asexually generic colchicine 0.5 mg online, a single dose of irradiation that resulted in radiation nephropathy did not cause the disease when fractionated into multiple, separated doses (Stewart et al. However, once damage has occurred, the pathological findings are the same, regardless of how the radiation was delivered (Lawton et al. The growing kidney appears to be more sensitive to irradiation than the adult kidney (Mitus et al. Doses of 10 Gy or more involving the abdomen are associated with a > 5% decrease in the size of the primarily irradiated kidney Clinical features the clinical presentation of radiation nephropathy falls into four broad categories, based on clinical features and timing of onset (Krochak and Baker, 1986) (Table 91. Acute radiation nephropathy this presents with an abrupt onset of renal dysfunction, 6­12 months after exposure. Benign hypertension may develop into malignant hypertension (see Chapter 216) over many years. Patients may present with symptoms of retinopathy, congestive heart failure, pleural and pericardial effusions, encephalopathy, and seizures (Luxton, 1961; Tarbell et al. Chronic radiation nephritis Hypertension 1­19 years From 18 months From 18 months Asymptomatic proteinuria Proteinuria may occur in the absence of abnormal renal function. It has not been demonstrated to progress to renal impairment (Krochak and Baker, 1986; Breitz, 2004). Asymptomatic proteinuria death is expressed at the time of the next mitosis (Soranson and Denekamp, 1986). Patients may present with symptoms of advanced renal failure, with lethargy, oedema, headaches, and shortness of breath. This is thought to be due in part to the systemic effect of radiation, resulting in increased peripheral resistance, which induces an increase in systemic blood pressure. Renal artery stenosis as a complication of abdominal irradiation has been well described (Dean and Abels, 1945; Staab et al. Patients have increased serum creatinine, proteinuria, and microscopic haematuria. The anaemia is usually hypochromic microcytic and can be due in part to haemolysis, although a positive response to erythropoietin therapy in patients with radiation nephropathy suggests that erythropoietin deficiency plays a substantial role (Cohen, 2000). The prognosis of acute radiation nephropathy has been linked to the severity of the hypertension (Krochak and Baker, 1986). Patients who survive the acute phase are left with varying degrees of chronic renal impairment. There is a tendency towards hyperkalaemia, due to suppression of the renin­aldosterone axis (Cohen, 2000). Haematology the degree of anaemia is disproportionately worse than would usually be expected for the degree of renal impairment. Urine Urinalysis may reveal proteinuria, microscopic haematuria, and occasional pyuria. Urinary excretion of 2 microglobulin may be increased, reflecting underlying tubular cell damage (Dewit et al. Renal biopsy There are limited biopsy studies of humans early in the disease process. As a result, the majority of specimens show changes of end-stage kidney damage, in which the initial injury can no longer be recognized (Fajardo et al. There are morphological similarities between radiation nephropathy and haemolytic-uraemic syndrome (see Chapter 174). There are no pathognomic changes, and diagnosis is suspected based on clinical features, consistent history, and the following pathological findings: Chronic radiation nephropathy this may occur as a sequela of acute radiation nephropathy, or present more indolently. Cases have been reported to present as late as 19 years after exposure to radiotherapy. Chronic radiation nephropathy has also been described in patients exposed to long-term, low-dose environmental radiation (Romanenko et al. Glomeruli There may be aneurysmal dilatation of capillary loops, obliteration of tufts, and segmental or total glomerulosclerosis (Guinan et al. There may be evidence of obstruction of the glomerular capillaries by platelets and fibrin (Fajardo et al. On electron microscopy this material appears to be basement membrane-like material deposited on the endothelial aspect of the basement membrane. Tubules and interstitium: atrophic tubules with hyaline casts are prominent, as is interstitial fibrosis (Kapur et al. Vessels: segmental arteries may display endothelial proliferation, with evidence of complete occlusion. The electron microscopy changes consist of folded thickened glomerular basement membranes, with areas of attenuation. Endothelial and mesangial cells reveal hypertrophic changes, with an increase both in cell size and cytoplasmic organelles. These changes are thought to be a direct effect of radiation damage, as they are not seen in biopsies of patients with malignant hypertension (Kapur et al. Endothelial disruption and leucocyte adherence is followed by subendothelial expansion (Jaenke et al. The initial endothelial disruption results in filtrate extruding from the capillaries, with protein and other high-molecular-weight blood components escaping into the extravascular space. This protein gradually becomes insoluble, resulting in impaired diffusion of oxygen and other essential metabolites (Breitz, 2004). Tubular damage Tubular epithelial cells appear to be more radiosensitive than epithelial cells from other tissues (Emery et al. Radiobiological data reveal that tubular epithelial cells have limited capacity to repair lethal and sublethal damage (Deschavanne et al. The tubular compartment may be further damaged indirectly by ischaemia secondary to radiation injury of the renal microvasculature (Krochak and Baker, 1986). Constriction of the tubular lumen at the origin of the proximal tubule (the glomerulotubular neck) has been demonstrated in porcine and rat radiation nephropathy (Cohen et al. Hypertension In large field or total body irradiation, increases in peripheral resistance may also induce a compensatory increase in systemic blood pressure (Krochak and Baker, 1986). Treatment and outcome Renal protection in the form of blocking or shielding devices to decrease the dose of irradiation to the kidneys has been shown to decrease the incidence of radiation nephropathy. The Wilms Tumour Study group from the United Kingdom recommends renal shielding during radiotherapy after unilateral nephrectomy for Wilms tumour (Taylor, 1997). The mechanistic basis for the increased efficacy of these agents is uncertain but may include their anti-inflammatory, antifibrogenic, and antimitogenic activity. Intravascular hemolysis and renal insufficiency after bone marrow transplantation. Characterization of renal damage following perinatal gamma radiation in the beagle. Influence of renal shielding on the incidence of late renal dysfunction associated with T-lymphocyte deplete bone marrow transplantation in adult patients. Long-term follow-up of renal functions of 108 children who underwent nephrectomy for malignant disease. Morbidity in a large cohort study of children born to mothers exposed to radiation from Chernobyl. Sequential evaluation of radiation-induced glomerular ultrastructural changes in the pig kidney. Radiation sclerosing proliferative atypical nephropathy of peritumoral tissue of renal-cell carcinomas after the Chernobyl accident in Ukraine. It has been hypothesized that they act to limit the consequences of endothelial cell damage (Moulder et al. Whether a similar benefit of early therapy occurs in human subjects is yet to be determined. Aspirin may have a preventative effect by inhibiting the increased platelet adhesion (Sinzinger and Firbas, 1985). There is experimental evidence for a beneficial effect of dexamethasone in rats (Geraci et al. Despite evidence of protection in other radiation-induced injuries (such as that of leucocytes) there has been no demonstrated benefit from the use of antioxidants such as vitamin A (Balabanli et al. Impact of drug therapy, radiation dose, and dose rate on renal toxicity following bone marrow transplantation. Captopril preserves function and ultrastructure in experimental radiation nephropathy. Study by the newer renal function tests of an unusual case of hypertension following irradiation of one kidney and the relief of the patient by nephrectomy. Radiation injury in the human kidney: a prospective analysis using specific scintigraphic and biochemical endpoints. Survival of mouse skin epithelial cells following single and divided doses of x-rays. Irradiation depresses prostacyclin generation upon stimulation with the platelet-derived growth factor. Loss of reirradiation tolerance in the kidney with increasing time after single or fractionated partial tolerance doses. Radiation nephropathy-the link between functional damage and vascular mediated inflammatory and thrombotic changes. Radiation nephropathy after radiotherapy in metastatic medullary thyroid carcinoma. Ionizing radiation enhances platelet adhesion to the extracellular matrix of human endothelial cells by an increase in the release of von Willebrand factor. Radiation nephropathy in rats and its modification by the angiotensin converting enzyme inhibitor enalapril. Its association with nephropathy dates back to lead poisoning (Chapter 88), but it is now clear that there are genetic (and very likely other) explanations for this coincidence (Chapter 316), it is not simply that urate levels or crystals are necessarily nephrotoxic. Urate (gout) nephropathy Gout is a disorder of purine metabolism, characterized by hyperuricaemia and urate crystal deposition within and around the joints (Richette and Bardin, 2010). The most important single risk factor for developing gout is the raised serum uric acid level. The recognition of increased comorbidity burden in patients with gout rendered it as a systemic disorder rather than simply a musculoskeletal disease. Older studies reported that 25% of gout patients had proteinuria, 50% had renal insufficiency, and 10% to 25% developed end-stage renal disease (Brochner-Mortensen, 1958; Talbott and Terplan, 1960). In autopsy studies, renal histologic abnormalities have been described in as many as 75­99% of patients with gout. Other histologic findings include arteriolosclerosis, glomerulosclerosis, and tubulointerstitial fibrosis. Urate crystal deposition has previously been considered as the mediator of renal injury (Greenbaum et al. The diagnosis of gout nephropathy may often be problematic, as histologic findings may be indistinguishable from benign nephrosclerosis or from age-associated renal changes. In patients with gout, the renal blood flow was found to be disproportionately low in comparison with the glomerular filtration rate (Berger et al. On the other hand, hypertension is very common, occurring in 50­60% of patients, and its prevalence increases as the renal function gets worse. Serum creatinine is usually normal or only mildly increased (Berger and Yu, 1975; Yu and Berger, 1982; Yu et al. This experimental model may share some features with the human tumour lysis syndrome; however, it may not be appropriate for understanding the renal effects of protracted milder hyperuricaemia. Recent data have shown that moderate and persistent uric acid elevations may also be detrimental to the kidney. A rat model of hyperuricaemia, using uricase inhibitor oxonic acid, enabled studies of renal damage associated with this condition. These hyperuricaemic rats showed preglomerular arterial disease, renal inflammation, and hypertension, via activation of the renin­angiotensin system (Kang et al. It has been speculated that the resulting thickening and macrophage infiltration of the afferent arteriole walls may induce postglomerular ischaemia. The reduction in vascular lumen could also provide a stimulus for the increase in renin expression, which contributes to the development of severe arterial hypertension (Mazzali et al. Furthermore, there is evidence that the arteriolopathy also leads to ineffective autoregulation and increased transmission of systemic pressures to the glomerulus (Sanchez-Lozada et al. In addition, uric acid turned out to be pro-oxidative under certain circumstances (Bagnati et al. This increased risk was independent of age, body mass index, systolic blood pressure, smoking, and proteinuria. Urate (gout) nephropathy seems to be related to other factors than hyperuricaemia alone. Management of urate nephropathy Some studies suggested that reduction of serum uric acid could improve gout nephropathy (Briney et al. However, it seems reasonable to try to lower serum uric acid in subjects with hyperuricaemia, especially when it is markedly elevated (> 10 mg/dL). The consumption of uric acid-raising foods should be reduced, including those with high purine content, fructose, and alcohol drinks. On the other hand, xanthine oxidase inhibitor allopurinol is a potent uric acid-lowering agent. Furthermore, high doses of allopurinol may cause xanthine or allopurinol crystal intratubular deposition, leading to a worsening of the renal disease. An alternative to allopurinol is febuxostat, a non-purine-analogue inhibitor of xanthine oxidase. Dose adjustment of this drug is not required in patients with impaired renal function and no cases of hypersensitivity syndrome have been reported with its use (Becker et al. When and why a water-soluble antioxidant becomes pro-oxidant during copper-induced low-density lipoprotein oxidation: a study using uric acid.

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