References of "CAVALIER, Etienne"
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See detailMeasuring 25-hydroxyvitamin D: where are we standing in 2013?
CAVALIER, Etienne ULg

Conference (2013, March 27)

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See detailCreatinine - or cystatin C - based equations to estimate glomerular filtration in the general population: impact on the epidemiology of chronic kidney disease
DELANAYE, Pierre ULg; CAVALIER, Etienne ULg; Moranne, Olivier et al

in BMC Nephrology (2013), 14

Chronic kidney disease (CKD) is a major issue in public health. Its prevalence has been calculated using estimation of glomerular filtration rate (GFR) by the creatinine-based equations developed in the ... [more ▼]

Chronic kidney disease (CKD) is a major issue in public health. Its prevalence has been calculated using estimation of glomerular filtration rate (GFR) by the creatinine-based equations developed in the Modified Diet in Renal Disease (MDRD) and Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) study. Recently, new equations based either on cystatin C (CKD-EPI Cys) or both cystatin and creatinine (CKD-EPI mix) have been proposed by the CKD-EPI consortium. The aim of this study was to measure the difference in the prevalence of stage 3 CKD, defined as an estimated GFR less than 60 mL/min/1.73 m2, in a population using these four equations. METHODS: CKD screening was performed in the Province of Liege, Belgium. On a voluntary basis, people aged over 50 years have been screened. GFR was estimated by the four equations. Stage 3 CKD was defined as a GFR less than 60 mL/min/1.73 m2. RESULTS: The population screened consisted of 4189 people (47% were men, mean age 63 +/- 7y). Their mean serum creatinine and plasma cystatin C levels were 0.88 +/- 0.21 mg/dL and 0.85 +/- 0.17 mg/L, respectively. The prevalence of CKD in this population using the MDRD, the CKD-EPI, the CKD-EPI Cys and the CKD-EPI mix equations was 13%, 9.8%, 4.7% and 5%, respectively. The prevalence of CKD was significantly higher with the creatinine-based (MDRD and the CKD-EPI) equations compared to the new cystatin C-based equations. CONCLUSIONS: Prevalence of CKD varies strongly depending on the method used to estimate GFR. Such discrepancies are of importance and must be confirmed and explained by additional studies, notably by studies using GFR measured with a reference method [less ▲]

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See detailParathormone and bone-specific alkaline phosphatase for the follow-up of bone turnover in hemodialysis patients : Is it so simple?
DELANAYE, Pierre ULg; DUBOIS, Bernard ULg; JOURET, François ULg et al

in Clinica Chimica Acta (2013), 417

Background: Chronic Kidney Disease (CKD) is associated with mineral and bone disorders (MBD). International guidelines suggest that levels of serum parathormone (PTH) or bone-specific alkaline phosphatase ... [more ▼]

Background: Chronic Kidney Disease (CKD) is associated with mineral and bone disorders (MBD). International guidelines suggest that levels of serum parathormone (PTH) or bone-specific alkaline phosphatase (b-ALP) can be used to evaluate MBD in dialysis patients. The evidence remains moderate and based on transversal studies. <br />Methods: We retrospectively investigated the variations of PTH (ΔPTH) and b-ALP (Δb-ALP) serum concentrations over a short (6-weeks) and a long (one-year) period in a monocentric hemodialysis population. The proportion of patients reaching the critical difference (CD) (50% for PTH and 25% for b-ALP) was calculated. <br />Results: Seventy-seven patientswere included. A significant correlation between PTHand b-ALP levelswas found at baseline (r=0.51). By contrast, no correlation was observed between ΔPTH and Δb-ALP over a 6-week interval (r=0.07). The CD for PTH and b-ALP was reached by 19 and 11 patients, respectively, with 2 patients showing consistent variations of both biomarkers. One year later, measurements were repeated in 48 survivors. <br />No correlation was found between ΔPTH and Δb-ALP (r=0.27). The CD for PTH or b-ALP was reached by 24 patients and 28 patients, respectively, with 6 patients (12.5%) showing opposite results for both biomarkers. <br />Conclusion: This study shows the lack of correlation between ΔPTH and Δb-ALP over time in patients under chronic hemodialysis. [less ▲]

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See detailVitamin D testing and clinical practice
CAVALIER, Etienne ULg

Conference (2013, January 31)

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See detailA randomised, double-blinded, placebo-controlled, parallel study of vitamin D3 supplementation with different schemes based on multiples of 25,000 IU doses
CAVALIER, Etienne ULg; Faché, W; Souberbielle, Jean-Caude

in International Journal of Endocrinology (2013)

Vitamin D (VTD) treatment is recommended in patients presenting different causes of diseases. To treat these patients, physicians rely on the different available pharmaceutical forms present in their ... [more ▼]

Vitamin D (VTD) treatment is recommended in patients presenting different causes of diseases. To treat these patients, physicians rely on the different available pharmaceutical forms present in their country. Unfortunately, even in a given country, there is no consensus on the best way to treat the patients. In Belgium, VTD is mostly prescribed as ampoules containing 25,000 IU of VTD. In this randomised controlled study, we evaluated whether four therapeutic schemes using multiples of 25,000 IU of VTD according to basal vitamin D concentration were able to increase or maintain the 25(OH)D serum level above 30 ng/mL. We randomized 175 subjects who received the drug () or placebo (). Total duration of the study was 12 weeks. Doses ranged from 4167 to 1667 IU/day. Blood sampling was performed at baseline and each 4 visits. In the treated (placebo) subjects, mean 25(OH)D serum concentration was 18.7 (19.1) ng/mL at baseline and 31.5 (20.7) ng/mL at w-12. At the end of the study, 57.1% of the subjects treated with VTD presented 25(OH)D serum concentration ≥30 ng/mL, whereas 94.3% were ≥20 ng/mL. In conclusion, the doses administered were safe and increased or maintained the 25(OH)D concentration ≥20 ng/mL. However, concentrations ≥30 ng/mL were only achieved in 57.1% of the subjects. [less ▲]

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See detailMDRD versus CKD-EPI equation to estimate glomerular filtration rate in kidney transplant recipients
Masson, I; Flamant, M; Maillard, N et al

Poster (2013)

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See detailAnnual meeting of the SBN/BVN
BOUQUEGNEAU, Antoine ULg; DELANAYE, Pierre ULg; CAVALIER, Etienne ULg et al

Conference (2013)

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See detailDeterminants of sclerostin concentration in hemodialysis patients.
DELANAYE, Pierre ULg; KRZESINSKI, Jean-Marie ULg; Warling, X et al

Poster (2013)

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See detailDéterminant physiologique du NGAL sanguin et discordance entre NGAL sanguin et urinaire.
DELANAYE, Pierre ULg; Claisse, G; Mehdi, M et al

Poster (2013)

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See detailDéterminant physiologique du NGAL sanguin et discordance entre NGAL sanguin et urinaire.
DELANAYE, Pierre ULg; Claisse, G; Mehdi, M et al

Poster (2013)

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See detailSkin color is relevant to vitamin D synthesis
LIBON, Florence ULg; CAVALIER, Etienne ULg; NIKKELS, Arjen ULg

in Dermatology (2013), 227(3), 250-4

BACKGROUND: Whether dark skin produces less vitamin D after UVB radiation than fair skin remains controversial. OBJECTIVE: To compare 25-hydroxyvitamin D [25-(OH)-D] levels after a single UVB exposure in ... [more ▼]

BACKGROUND: Whether dark skin produces less vitamin D after UVB radiation than fair skin remains controversial. OBJECTIVE: To compare 25-hydroxyvitamin D [25-(OH)-D] levels after a single UVB exposure in fair (phototype II-III) and black-skinned (phototype VI) volunteers. METHODS: Fair-skinned volunteers (n = 20, 4 males/16 females, mean age: 23.2 years) and black-skinned (n = 11, 6 males/5 females, mean age: 23.8 years) received a single total body UVB exposure (0.022 J/cm(2)). The 25-(OH)-D levels were measured on days 0, 2 and 6. RESULTS: On day 0, all volunteers were severely vitamin D deficient. On day 2, 25-(OH)-D levels of fair-skinned volunteers increased significantly (median: 11.9-13.3 ng/ml, p < 0.0001), but not in black-skinned people (median: 8.60-8.55 ng/ml, p = 0.843). Again, on day 6, 25-(OH)-D levels of fair-skinned volunteers increased significantly (median: 11.9-14.3 ng/ml, p < 0.0001), but not in black-skinned people (median: 8.60-9.57 ng/ml, p = 0.375). CONCLUSION: This study suggests that skin pigmentation negatively influences vitamin D synthesis. [less ▲]

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See detailLa vitamine D et la peau
LIBON, Florence ULg; CAVALIER, Etienne ULg; NIKKELS, Arjen ULg

in Revue Médicale de Liège (2013), 68(9), 458-464

Vitamin D is well known for its beneficial effects on phosphocalcic homeostasis. The discovery of the role of vitamin D in cancers, infections, cardiovascular or autoimmune pathologies have promoted ... [more ▼]

Vitamin D is well known for its beneficial effects on phosphocalcic homeostasis. The discovery of the role of vitamin D in cancers, infections, cardiovascular or autoimmune pathologies have promoted interest for this molecule. Skin and vitamin D are closely related. The skin is not only the site of vitamin D synthesis, but also a target organ as calcitriol plays an important hormonal and regulatory role, acting on cell proliferation, differentiation and immunomodulation. Furthermore, vitamin D influences the incidence and therapeutic response of certain dermatoses. In addition, many medical situations, mainly dermatological, require strict photoprotection and may therefore indirectly be responsible for a vitamin D deficiency in patients. The current role of vitamin D in skin cancers, inflammatory and autoimmune skin diseases is summarized. [less ▲]

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