References of "CAVALIER, Etienne"
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See detailNatural history of mineral metabolism, bone turnover and bone mineral density in de novo renal transplant recipients treated with a steroid minimization immunosuppressive protocol.
Evenepoel, Pieter; Claes, Kathleen; Meijers, Bjorn et al

in Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association (in press)

The skeletal effects of renal transplantation are not completely understood, especially in patients managed with a steroid minimization immunosuppressive protocol and long term. We enrolled 69 adult ... [more ▼]

The skeletal effects of renal transplantation are not completely understood, especially in patients managed with a steroid minimization immunosuppressive protocol and long term. We enrolled 69 adult transplant recipients (39 males; ages 51.1 +/- 12.2 years), free of antiresorptive therapy and managed with a steroid minimization immunosuppressive protocol, into a 5-year prospective observational study to evaluate changes in areal bone mineral density (aBMD), mineral metabolism and bone remodelling. Dual energy X-ray absorptiometry, laboratory parameters of mineral metabolism (including parathyroid hormone, sclerostin and fibroblast growth factor 23) and non-renal cleared bone turnover markers (BTMs) (bone-specific alkaline phosphatase, trimeric N-terminal propeptide and tartrate-resistant acid phosphatase 5b) were assessed at baseline and 1 and 5 years post-transplantation. The mean cumulative methylprednisolone exposure at 1 and 5 years amounted to 2.5 +/- 0.8 and 5.8 +/- 3.3 g, respectively. Overall, bone remodelling activity decreased after transplantation. Post-transplant aBMD changes were minimal and were significant only in the ultradistal radius during the first post-operative year {median -2.2% [interquartile range (IQR) -5.9-1.2] decline, P = 0.01} and in the lumbar spine between Years 1 and 5 [median 1.6% (IQR -3.2-7.0) increase, P = 0.009]. BTMs, as opposed to mineral metabolism parameters and cumulative corticosteroid exposure, associated with aBMD changes, both in the early and late post-transplant period. Most notably, aBMD changes inversely associated with bone remodelling changes. In summary, in de novo renal transplant recipients treated with a steroid minimization immunosuppressive protocol, BMD changes are limited, highly variable and related to remodelling activity rather than corticosteroid exposure. [less ▲]

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See detailExternal Quality Assessment of 24,25-dihydroxyvitamin D3 (24,25(OH)2D3) assays.
Carter, G. D.; Ahmed, F.; Berry, J. et al

in The Journal of steroid biochemistry and molecular biology (in press)

The discovery that mutations of the CYP24A1 gene are a cause of idiopathic infantile hypercalcemia (IIH) has revived interest in measuring serum 24,25(OH)2D3. Several studies have also suggested that a ... [more ▼]

The discovery that mutations of the CYP24A1 gene are a cause of idiopathic infantile hypercalcemia (IIH) has revived interest in measuring serum 24,25(OH)2D3. Several studies have also suggested that a high 25-hydroxyvitamin D3(25-OHD3):24,25(OH)2D3 ratio might provide additional diagnostic information in the investigation of vitamin D deficiency. Measurement of 24,25(OH)2D3 is necessarily restricted to laboratories with mass spectrometry methods although cross reactivity of the metabolite in immunoassays for 25-OHD is a potential cause of misleading results. The international External Quality Assessment (EQA) scheme for vitamin D metabolites (DEQAS) was set up in 1989. In 2013 DEQAS became an accuracy based EQA for 25-OHD with 'target values' assigned by the National Institute of Standards and Technology (NIST) Reference Measurement Procedure (RMP). A pilot scheme for serum 24,25(OH)2D3 was started in 2015 and participants were asked to measure the metabolite on each of the 5 samples sent out for 25-OHD. Inter-laboratory agreement was poor but this may reflect methodological differences, in particular different approaches to assay standardization. An important potential contribution to reducing variability among assays was the development by NIST of a 24,25(OH)2D3 RMP and its use in assigning values to SRMs 972a, 2973 and 2971, supported by the NIH Office of Dietary Supplements (ODS) as part of the Vitamin D Standardization Program (VDSP) effort. [less ▲]

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See detailPoor Vitamin K Status Is Associated With Low Bone Mineral Density and Increased Fracture Risk in End-Stage Renal Disease.
Evenepoel, Pieter; Claes, Kathleen; Meijers, Bjorn et al

in Journal of Bone and Mineral Research : The Official Journal of the American Society for Bone and Mineral Research (in press)

Chronic kidney disease and osteoporosis are major public health problems associated with an aging population. Vitamin K insufficiency is prevalent among patients with end-stage renal disease (ESRD ... [more ▼]

Chronic kidney disease and osteoporosis are major public health problems associated with an aging population. Vitamin K insufficiency is prevalent among patients with end-stage renal disease (ESRD). Preliminary data indicate that poor vitamin K status may compromise bone health and that increased inflammation may be in the causal pathway. We performed an ancillary analysis of data collected in the frame of prospective observational cohort studies exploring various aspects of bone health in de novo renal transplant recipients to investigate the association between vitamin K status, inflammation, bone mineral density, and incident clinical fractures. Parameters of mineral metabolism (including biointact PTH and FGF23, sclerostin, calcidiol, calcitriol) and inflammation (CRP and IL-6), osteoprotegerin, bone turnover markers (P1NP, BsAP, and TRAP5B), and dephosphorylated-uncarboxylated Matrix Gla Protein (dp-ucMGP) were assessed on blood samples collected immediately prior to kidney transplantation in 468 patients. Areal bone mineral density (aBMD) was measured at the lumbar spine and femoral neck by dual-energy X-ray absorptiometry within 14 days posttransplant. Poor vitamin K status, defined by dp-ucMGP >500 nmol/L, was highly prevalent (90%). High dp-ucMGP levels independently associated with elevated inflammatory markers and low aBMD. No associations were observed between vitamin K status and bone turnover markers. During a median follow-up of 5.1 years, 33 patients sustained a fragility fracture. In Cox-proportional hazards analysis, a dp-ucMGP above median associated with incident fractures, independent of classical determinants, including age, gender, history of fracture, and aBMD (HR 2.21; 95% CI, 1.00 to 4.91; p < 0.05). In conclusion, poor vitamin K status associates with inflammation and low aBMD in patients with ESRD and confers an increased risk of incident fractures in de novo renal transplant recipients. (c) 2018 American Society for Bone and Mineral Research. [less ▲]

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See detailVitamin D nutritional status and bone turnover markers in childhood acute lymphoblastic leukemia survivors: A PETALE study
Delvin, E.; Alos, N.; Rauch, F. et al

in Clinical Nutrition (in press)

Background: The remarkable progress in the treatment of childhood acute lymphoblastic leukemia (cALL) has led to a survival rate reaching 90%. This success story is unfortunately linked to increased risk ... [more ▼]

Background: The remarkable progress in the treatment of childhood acute lymphoblastic leukemia (cALL) has led to a survival rate reaching 90%. This success story is unfortunately linked to increased risk of impaired skeletal mass accumulation during childhood and adolescence, predisposing the patients to osteoporosis and pathological fractures at adulthood. Objective: This study aims at characterizing the vitamin D status and bone health biomarkers in a well-characterized cohort of cALL survivors. Results: Food frequency questionnaires reveal that (i) the total vitamin D intake varies greatly (44–2132 IU/d), (ii) only 16.8% of the participants consume vitamin D supplements, and (iii) 74% of survivors' intakes are below the Recommended Daily Intakes (400 IU/d). For the 42 participants taking vitamin D supplements, the median (2.5–97.5%iles) intake is 600 IU/d (21.2–1972 IU/d). Sixteen participants are vitamin D deficient (<30 nM) and 66 insufficient (≥30 – <50 nM). Serum 24,25(OH)2D3 concentrations are directly related to those of 25OHD3, and those of 3-epi-25OHD3 below the Lower Limit of Quantification in most samples. The participants' serum concentrations of cross-linked C-telopeptide of type-I collagen and intact amino-terminal pro-peptide of type-I collagen decrease steadily with age, leveling at adulthood, and are at all times higher in males. Conclusion: The present study shows that the prevalence of vitamin D insufficiency or deficiency is not greater in cALL survivors compared to the general Canadian population despite low vitamin D food and supplement intakes. Furthermore, there seem to be no overt imbalance in the gender- and age-adjusted serum bone turnover marker concentrations. © 2018 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism [less ▲]

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See detailParathyroid hormone results interpretation in the background of variable analytical performance
CAVALIER, Etienne ULiege

in Journal of Laboratory and Precision Medicine (2019), 4(1),

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See detailUltra-high-performance liquid chromatography-mass spectrometry method for neutrophil gelatinase-associated lipocalin as a predictive biomarker in acute kidney injury
Ion, Valentin ULiege; Nys, Gwenaël ULiege; COBRAIVILLE, Gaël ULiege et al

in Talanta (2019), 195

Neutrophil gelatinase associated lipocalin (NGAL) is a protein that was found to be overexpressed in acute kidney injury (AKI). The rise in NGAL concentration, both in urine or plasma, appears earlier ... [more ▼]

Neutrophil gelatinase associated lipocalin (NGAL) is a protein that was found to be overexpressed in acute kidney injury (AKI). The rise in NGAL concentration, both in urine or plasma, appears earlier than for other classical renal function markers such as serum creatinine, thus making it a suitable marker for early pathology detection. The aim of this study was to develop a method involving tryptic digestion, solid phase extraction and LC-MS/MS analysis to analyze NGAL in plasma medium using an isotope labeled surrogate protein, containing NGAL signature tags, as internal standard (QPrEST). The method was validated for the analysis of NGAL in an analytical range from 50 to 1250 ng/mL using two different proteotypic peptides. The method was further used to quantify the NGAL in human plasma samples for whom elevated NGAL values were expected. NGAL values were between 190.8 and 242.6 ng/mL for control group and between 228.1 and 3526.2 ng/mL for patient group. This study proved that the selection of the right internal standard is of utmost importance in targeted proteomics studies as the digestion steps might cause high variability. This study also confirmed that, although NGAL is highly resistant to proteases such as trypsin, the method could be fully validated according to FDA guidelines and subsequently used to assess NGAL levels in patient plasma with high analytical confidence. © 2018 [less ▲]

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See detailEstablishment of reference intervals for serum concentrations of androstanediol glucuronide by a newly developed LC-MS/MS method.
Fabregat-Cabello, Neus; PEETERS, Stéphanie ULiege; Yilmaz, Tugba ULiege et al

in Steroids (2019), 143

BACKGROUND: Androstanediol glucuronide is linked to a range of disorders of peripheral androgen formation and action, such as in hirsutism and acne. Nowadays its accurate quantification is still ... [more ▼]

BACKGROUND: Androstanediol glucuronide is linked to a range of disorders of peripheral androgen formation and action, such as in hirsutism and acne. Nowadays its accurate quantification is still challenging and there are just a few LC-MS/MS methods available. Besides, their reference intervals for normal European populations by LC-MS/MS, including prepubertal and pubertal children, have not been reported yet. METHODS: Validation of the proposed new methodology was performed at 3 levels in triplicate during 3 different days. Calibration curve concentration ranged from 0.1 to 25microg/L. For method comparison between ELISA and the newly developed LC-MS/MS method, 43 patient samples were tested. A reference interval study was performed with 264 healthy Belgian individuals (108 male and 156 female). RESULTS: Validation of the proposed LC-MS/MS method was satisfactorily achieved, with mean imprecision values lower than 7.4%, mean recoveries within 99-108% and a limit of quantification of 0.059microg/L. Compared to LC-MS/MS, ELISA showed a positive bias in serum samples, providing results 43% higher for the same sample. As a consequence, new reference intervals based on age and gender have been calculated. CONCLUSION: An easy, fast and straightforward LC-MS/MS method for the determination of androstanediol glucuronide has been developed and fully validated. Besides, reference interval for normal European populations, including prepubertal and pubertal children has been established for the first time. [less ▲]

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See detailEstimating uncertainty of target values for DEQAS serum materials.
Durazo-Arvizu, R. A.; Ahmed, F.; Berry, J. et al

in The Journal of steroid biochemistry and molecular biology (2019)

The External Quality Assessment (EQA) scheme for vitamin D metabolites (DEQAS) distributes human serum samples to laboratories across the world to assess their performance in measuring serum total 25 ... [more ▼]

The External Quality Assessment (EQA) scheme for vitamin D metabolites (DEQAS) distributes human serum samples to laboratories across the world to assess their performance in measuring serum total 25-hydroxyvitamin D [25(OH)D], i.e. the sum of the concentrations of serum 25(OH)D2 and 25(OH)D3. In 2013 DEQAS, in collaboration with the Vitamin D Standardization Program (VDSP), became an accuracy-based EQAS when the National Institute for Standards and Technology (NIST) began assigning 25(OH)D target values to DEQAS serum samples using their Joint Committee for Traceability in Laboratory Medicine (JCTLM) approved reference measurement procedure (RMP). Historically, NIST has performed 4 determinations of 25-OHD2 and 25-OHD3 on each sample and used the mean values to calculate a single 'target value' for Total 25-OHD against which performance was judged. By definition the target values cannot be exact and each is associated with a level of uncertainty. The total uncertainty (UNIST) has two components, one from the 25(OH)D2, and 25(OH)D3 measurements and the other associated with the calibration procedure. The total combined uncertainty is calculated by adding up these uncertainties. In future, uncertainties will be attached to the target value in each DEQAS serum sample, starting with the next distribution cycle in 2019. Confidence intervals obtained using these uncertainties will allow DEQAS participants to determine if their result agrees with the NIST assigned target value. Furthermore, if the value falls within the confidence interval the laboratory's assay would be regarded as traceable, i.e. standardized, to the NIST RMP. [less ▲]

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See detailA distinct bone phenotype in ADPKD patients with end-stage renal disease.
Evenepoel, Pieter; Claes, Kathleen; Cavalier, Etienne ULiege et al

in Kidney International (2019), 95(2), 412-419

Autosomal dominant polycystic kidney disease (ADPKD) is among the most common hereditary nephropathies. Low bone turnover osteopenia has been reported in mice with conditional deletion of the PKD1 and ... [more ▼]

Autosomal dominant polycystic kidney disease (ADPKD) is among the most common hereditary nephropathies. Low bone turnover osteopenia has been reported in mice with conditional deletion of the PKD1 and PKD2 genes in osteoblasts, and preliminary clinical data also suggest suppressed bone turnover in patients with ADPKD. The present study compared the bone phenotype between patients with end stage renal disease (ESRD) due to ADPKD and controls with ESRD due to other causes. Laboratory parameters of bone mineral metabolism (fibroblast growth factor 23 and sclerostin), bone turnover markers (bone alkaline phosphatase, tartrate-resistant acid phosphatase 5b) and bone mineral density (BMD, by dual energy x-ray absorptiometry, DXA) were assessed in 518 patients with ESRD, including 99 with ADPKD. Bone histomorphometry data were available in 71 patients, including 10 with ADPKD. Circulating levels of bone alkaline phosphatase were significantly lower in patients with ADPKD (17.4 vs 22.6 ng/mL), as were histomorphometric parameters of bone formation. Associations between ADPKD and parameters of bone formation persisted after adjustment for classical determinants including parathyroid hormone, age, and sex. BMD was higher in skeletal sites rich in cortical bone in patients with ADPKD compared to non-ADPKD patients (Z-score midshaft radius -0.04 vs -0.14; femoral neck -0.72 vs -1.02). Circulating sclerostin levels were significantly higher in ADPKD patients (2.20 vs 1.84 ng/L). In conclusion, patients with ESRD due to ADPKD present a distinct bone and mineral phenotype, characterized by suppressed bone turnover, better preserved cortical BMD, and high sclerostin levels. [less ▲]

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See detailBone and mineral symposium
Cavalier, Etienne ULiege

Conference (2018, December 11)

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See detailWhat would be the drivers to use 3rd generation PTH assays in CKD patients?
Cavalier, Etienne ULiege

Conference (2018, December 07)

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See detailMoving from the second to the third generation Roche PTH assays: What are the consequences for clinical practice?
Dupuy, A. M.; Bargnoux, A. S.; Morena, M. et al

in Clinical Chemistry and Laboratory Medicine (2018)

The determination of parathyroid hormone (PTH) is essential for exploring phosphocalcic disorders especially in patients with renal failure. At present, second or third generation PTH assays are available ... [more ▼]

The determination of parathyroid hormone (PTH) is essential for exploring phosphocalcic disorders especially in patients with renal failure. At present, second or third generation PTH assays are available on the market from Roche Diagnostics as well as from others companies but the lack of standardization has complicated the interpretation. We wanted to assess the clinical impact by measuring the PTH levels with the two generations concomitantly on different groups of populations including 46 healthy, 103 pre-dialyzed and 73 hemodialyzed (HD) patients. In healthy subjects, the PTH concentrations were not different whatever the generation used, whereas beyond 200 pg/mL, we reported an overestimation of the second generation PTH. In patients with chronic kidney disease (CKD) stage 3-5 the observed differences between the two generations increase with increasing PTH levels and decreasing glomerular filtration rate (GFR). Classification according to the kidney disease: improving global outcomes (KDIGO) revealed a high percentage of discordant results between the two generations (κ coefficient <0.20). These discrepancies are clinically relevant as PTH levels remain the cornerstone for diagnosis and treatment of the CKD-mineral and bone disorder (CKD-MBD). The introduction of a new PTH assay generation in clinical practice should be carried out with caution. © 2018 Walter de Gruyter GmbH, Berlin/Boston. [less ▲]

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See detailRaman chemical imaging, a new tool in kidney stone structure analysis: Case-study and comparison to Fourier Transform Infrared spectroscopy
Castiglione, Vincent ULiege; Sacre, Pierre-Yves ULiege; Cavalier, Etienne ULiege et al

Poster (2018, November 16)

The kidney stone’s structure might provide clinical information in addition to the stone composition. The Raman chemical imaging is a technology used for the production of two- dimension maps of the ... [more ▼]

The kidney stone’s structure might provide clinical information in addition to the stone composition. The Raman chemical imaging is a technology used for the production of two- dimension maps of the constituents’ distribution in samples. We aimed at determining the use of Raman chemical imaging in urinary stone analysis. Fourteen calculi were analyzed by Raman chemical imaging using a confocal Raman micro- spectrophotometer. They were selected according to their heterogeneous composition and morphology. Raman chemical imaging was performed on the whole section of stones. Once acquired, the data were baseline corrected and analyzed by MCR-ALS. Results were then compared to the spectra obtained by Fourier Transform Infrared spectroscopy. [less ▲]

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See detailDiagnostic accuracy of three automated urine analyzers compared to urine culture
Castiglione, Vincent ULiege; GADISSEUR, Romy ULiege; Bernard, Maxime ULiege et al

Poster (2018, November 16)

Urine culture is an important diagnosis method of urinary tract infection. However, it is time-consuming and results aren’t available quickly. Automated urine analyzers have been developed to screen urine ... [more ▼]

Urine culture is an important diagnosis method of urinary tract infection. However, it is time-consuming and results aren’t available quickly. Automated urine analyzers have been developed to screen urine samples more rapidly. The goal of this study was to compare three automated analyzers to urine culture: the Atellica UAS 800 (Siemens, Munich, Germany), the UF-4000 (Sysmex, Kobe, Japan) and the SediMAX (Menarini, Florence, Italy). We first validated each analyzer. We analyzed then 318 samples with the three analyzers within 2 hours after sample reception. An urine aliquot was collected before sediment analysis for bacteria culture. Ten microliters of un-centrifuged urine was inoculated on blood agar and CLED agar plates, then they were incubated aerobically at 36°C for 24 h. Bacteria count of each analyzer was compared to urine culture to determine diagnostic accuracy. The result was considered positive when the bacteria growth reached 104 CFU/ml. We also used the results of leukocytes and nitrites results from the strip measurement to improve the accuracy. The abilities of the UF-4000 to distinguish Gram positive (GP) from Gram negative (GN) bacteria, and of the UAS 800 to identify rod and cocci, were determined. [less ▲]

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See detailUrine sediment analysis: comparison of three automated analyzers to manual microscopy
Castiglione, Vincent ULiege; GADISSEUR, Romy ULiege; Bernard, Maxime ULiege et al

Poster (2018, November 16)

Urine microscopic analysis is an old method that reveals information about kidney health. Several automated analyzers, that are less time-consuming, are currently available, but manual microscopy is still ... [more ▼]

Urine microscopic analysis is an old method that reveals information about kidney health. Several automated analyzers, that are less time-consuming, are currently available, but manual microscopy is still the gold-standard method. The goal of this study was to validate and compare three automated analyzers to manual microscopy: the Atellica UAS800 (Siemens, Munich, Germany), the UF-4000 (Sysmex, Kobe, Japan) and the SediMax (Menarini, Florence, Italy). We first validated each analyzer. A total of 359 samples were analyzed with the three analyzers and with a manual microscope within 2 hours. Two trained reviewers used a microscope with bright field, contrast phase and polarized light to identify urine elements. The diagnostic accuracy was determined thanks to microscopy results. [less ▲]

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See detailComparison of three automated strip analyzers to Cobas 800 for the analysis of glucose, proteins, albumin and creatinine
Castiglione, Vincent ULiege; GADISSEUR, Romy ULiege; Bernard, Maxime ULiege et al

Poster (2018, November 16)

Urine glucose, proteins, albumin and creatinine are measured for the screening of diabetes and renal diseases. The automated strip analyzers are used for quick screening of large populations. The goal of ... [more ▼]

Urine glucose, proteins, albumin and creatinine are measured for the screening of diabetes and renal diseases. The automated strip analyzers are used for quick screening of large populations. The goal of this study was to compare a more accurate method, the Cobas 8000 (Roche, Bale, Switzerland) to three automated analyzers: the Clinitek Novus (Siemens, Munich, Germany), the UC-3500 (Sysmex, Kobe, Japan) and the AutionMax (Menarini, Florence, Italy). A total of 284 urine samples were prospectively collected for the comparison. The samples were analyzed on the three analyzers within 2 hours. Before the analysis of samples by each method, an aliquot was frozen at -80°C. All samples were then defrost and analyzed in one batch with the Cobas 8000 (Roche, Bale, Switzerland) within the month. The diagnostic accuracy was determined thanks to the results of the Cobas 8000. However, the creatinine and albumin cannot be assessed with the AutionMax. [less ▲]

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See detailThematic Approaches: the exemple of Bone metabolism
Cavalier, Etienne ULiege

Conference (2018, November 11)

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See detailClinical data on rare Sulfamethoxazole crystalluria assessed by Fourier Transform Infrared Spectrophotometry
CASTIGLIONE, Vincent ULiege; CAVALIER, Etienne ULiege; GADISSEUR, Romy ULiege

in Data in Brief (2018)

The data contained in this article are related to the article entitled “Case report: Uncommon Sulfamethoxazole Crystalluria” [1]. Sulfamethoxazole crystalluria is very rare and crystals identification is ... [more ▼]

The data contained in this article are related to the article entitled “Case report: Uncommon Sulfamethoxazole Crystalluria” [1]. Sulfamethoxazole crystalluria is very rare and crystals identification is complex [2], [3]. We identified seven patients with uncommon urine crystals that were composed of N-Acetyl-Sulfamethoxazole. Three of the patients developed an acute renal failure simultaneously to crystalluria. Hence, this article describes the method of crystals identification thanks to infrared spectroscopy. The relevant clinical data of patients, including medical history, drug dosage and urine parameters related to the crystalluria are presented. [less ▲]

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