References of "Defraigne, Jean-Olivier"
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See detailActivation of the calcium-sensing receptor before renal ischemia/reperfusion exacerbates kidney injury
WEEKERS, Laurent ULg; De Tullio, Pascal ULg; BOVY, Christophe ULg et al

in American Journal of Translational Research (2015), 7(1), 128-138

Activation of the calcium-sensing receptor (CaSR) by ischemia/reperfusion (I/R) favours apoptosis in cardiomyocytes, hepatocytes and neurons. Its role in renal I/R is unknown. We investigated the impact ... [more ▼]

Activation of the calcium-sensing receptor (CaSR) by ischemia/reperfusion (I/R) favours apoptosis in cardiomyocytes, hepatocytes and neurons. Its role in renal I/R is unknown. We investigated the impact of pharmacological preactivation of the CaSR on kidney structure and function in a murine model of bilateral renal 30-min ischemia and 48-hour reperfusion, and in a 6-year cohort of kidney transplant recipients (KTR). C57BL/6J mice were administered daily with CaSR agonist, R-568, or with vehicle for 48 hours. Evaluation of serum urea and creatinine levels, renal histology and urine metabolome by nuclear magnetic resonance showed that R-568 was not nephrotoxic per se. Following I/R, serum urea and creatinine levels increased higher in R-568-treated animals than in controls. Jablonski’s score was significantly greater in R-568-treated kidneys, which showed a higher rate of cell proliferation and apoptosis in comparison to controls. Next, we retrospectively identified 36 patients (10.7% of our cohort) who were treated by CaSR agonist, cinacalcet, at the time of kidney transplantation (KTx). After matching these to 61 KTR upon type of donor, cold ischemic time, residual diuresis, and donor age, we observed that delayed graft function, i.e. need for dialysis in the first week after KTx, occurred in 42 and 23% of cinacalcet-treated and control groups, respectively (p≤0.05). These data suggest that pharmacological preactivation of the CaSR before renal I/R exacerbates kidney injury. [less ▲]

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See detailLow molecular weight poly (2-dimethylamino ethylmethacrylate) polymers with controlled positioned fluorescent labeling: Synthesis, characterization and in vitro interaction with human endothelial cells.
Flebus, Luca ULg; Lombart, François ULg; Sevrin, Chantal et al

in International journal of pharmaceutics (2015), 478(1), 278-287

Poly (2-dimethylamino ethylmethacrylate) (PDMAEMA) is an attractive non-degradable polymer studied as nonviral vector for gene delivery but it can be also adopted for delivery of other biopharmaceutical ... [more ▼]

Poly (2-dimethylamino ethylmethacrylate) (PDMAEMA) is an attractive non-degradable polymer studied as nonviral vector for gene delivery but it can be also adopted for delivery of other biopharmaceutical drugs. As a parenteral carrier, the PDMAEMA free form (FF) might interact with tissues and cells. Few data are available on its selective internalization and efflux from cells, while the majority of studies published have followed the distribution of DNA complexed with PDMAEMA. In order to address polycation safety, the first aim was to synthesize by atom transfer radical polymerisation (ATRP) fluorescent labeled PDMAEMA of low molecular weight (Mw) (below 15kDa), controlling the position and density of fluorescein. The second goal was to analyze the possible difference in uptake and subcellular distribution of this labeled FF polycation between human umbilical vein endothelial cells (HUVEC) and hCMEC/D3 cells. These two cell lines have been chosen in order to detect selectivity towards the blood-brain barrier (BBB). In both cases, polycation was detected along the plasma membrane followed by progressive migration to the peri-nuclear region, where it overlapped with lysosomal structures. The analysis by fluorescence-activated cell sorting (FACS) of the PDMAEMA uptake by hCMEC/D3 cells showed a significant (p<0.05) inhibition (40%) in presence of 2-dexoxy-d-glucose inhibitor, a result supporting an energy-dependence mechanism(s). Cytotoxicity study showed that low Mw PDMAEMA (10kDa) lead to a minor cytotoxicity compared to the higher ones. As main conclusion this study highlights the similitude in cell trafficking of FF PDMAEMA and data previously reported for PDMAEMA/DNA complexes. [less ▲]

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See detail(Tissue PET) vascularmetabolic imaging and peripheral plasma biomarkers in the evolution of chronic aortic dissections
SAKALIHASAN, Natzi ULg; NIENABER, Christoph; HUSTINX, Roland ULg et al

in European Heart Journal - Cardiovascular Imaging (2015)

Enhanced FDG uptake may be considered as a complementary imaging marker associated with secondary complications in type B dissections. During follow-up, aneurysmal progression is related to PET/CT and ... [more ▼]

Enhanced FDG uptake may be considered as a complementary imaging marker associated with secondary complications in type B dissections. During follow-up, aneurysmal progression is related to PET/CT and biomarkers of thrombus renewal and lysis. [less ▲]

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See detailGene Expression Study in Positron Emission Tomography–Positive Abdominal Aortic Aneurysms Identifies CCL18 as a Potential Biomarker for Rupture Risk
Courtois, Audrey ULg; Nusgens-Richelle, Betty ULg; HUSTINX, Roland ULg et al

in Molecular Medicine (2015)

Rupture of abdominal aortic aneurysm (AAA) is a cause of significant mortality and morbidity in ageing populations. Uptake of 18-fluorodeoxyglucose (FDG) detected by positron emission tomography (PET) is ... [more ▼]

Rupture of abdominal aortic aneurysm (AAA) is a cause of significant mortality and morbidity in ageing populations. Uptake of 18-fluorodeoxyglucose (FDG) detected by positron emission tomography (PET) is observed in the wall of 12% of AAA (A+), most of them being symptomatic. We previously showed that the metabolically active areas displayed adventitial inflammation, medial degeneration and molecular alterations prefacing wall rupture. The aim of this study was to identify new factors predictive of rupture.Transcriptomic analyses were performed in the media and adventitia layers from three types of samples: AAA without (A0) and with FDG uptake (A+), both at the positive spot (A+Pos) and at a paired distant negative site (A+Neg) of the same aneurysm. Follow-up studies included RT-PCR, immunohistochemical staining and ELISA. A large number of genes, including matrix metalloproteinases, collagens and cytokines as well as genes involved in osteochondral development, were differentially expressed in the A+Pos as compared to A+Neg. Moreover, a series of genes, notably CCL18, was differentially expressed both in the A+Neg and A+Pos as compared to the A0. A significant increase of CCL18 was also found at the protein level in the aortic wall and in peripheral blood of A+ patients as compared to A0.In conclusion, new factors, including CCL18, involved in the progression of AAA and, potentially, in their rupture were identified by a genome-wide analysis of PET-positive and negative human aortic tissue samples. Further work is needed to study their role in AAA destabilization and weakening. [less ▲]

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See detail18F-FDG PET/CT in the Management of Aortitis.
Bruls, Samuel; Courtois, Audrey ULg; Nusgens-Richelle, Betty ULg et al

in Clinical nuclear medicine (2015)

BACKGROUND: Aortitis is a generic term defined as an inflammatory condition involving the aortic wall, of infectious or noninfectious origin. This inflammatory process may deteriorate the aortic wall ... [more ▼]

BACKGROUND: Aortitis is a generic term defined as an inflammatory condition involving the aortic wall, of infectious or noninfectious origin. This inflammatory process may deteriorate the aortic wall, resulting in potentially life-threatening vascular complications. Therefore, it is important to establish a diagnosis as early as possible. PATIENTS AND METHODS: During a 4-year period, 428 consecutive patients referred to our department for aortic diseases underwent FDG PET/CT examinations. Among these, 18 patients (4.2%) were suspected to have aortitis. All of them had an initial positive FDG PET/CT uptake occurring in the aorta and major branches as evaluated by visual analysis of images and assessed with the final diagnosis of aortitis. During follow-up, after surgery and/or upon immunosuppressive treatment, each of these patients underwent a second PET/CT that was compared with the initial evaluation. In all cases, normalization of FDG uptake was correlated with clinical improvement. CONCLUSIONS: Our study aimed to illustrate the potential clinical value of functional monitoring with PET/CT in the management of aortitis. FDG PET/CT constitutes a valuable imaging modality to establish an early diagnosis, monitor disease progression and treatment, and evaluate vascular complication and relapse. We highlight the importance of an early detection of inflammatory large-vessel pathology, which may represent a major threat. [less ▲]

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See detailThe Total Antioxidant Capacity of Foods: a reappraisal. Application to commercial orange juices
PINCEMAIL, Joël ULg; Tabart, Jessica; Defraigne, Jean-Olivier ULg et al

in journal of antioxidant activity (2015), 1

Since a few years, more and more attention has been specifically given to dietary antioxidants as agents promoting health and preventing the incidence of diseases. As part of these efforts, analytical ... [more ▼]

Since a few years, more and more attention has been specifically given to dietary antioxidants as agents promoting health and preventing the incidence of diseases. As part of these efforts, analytical methods and assays have been developed to measure the antioxidant content in food substances. In this paper, the antioxidant capacity of 17 orange juices is determined by various assays (DPPH, ORAC, heamolysis, xanthine/xanthine oxidase) as the content in ascorbic acid and total phenolics. The results evidence all the complexity to evaluate the in vitro antioxidant capacity of foods. In very general terms, in spite of the wide utilization in these tests (FRAP, TAC, ORAC TRAP and others), their significance remains obscure. The discrepancy of the results and the absence of good correlation between the assays clearly highlight all the importance of understanding the strengths and weakness of assays evaluating antioxidant potential of a food at the risk of giving erroneous information to the consumer. It is clear that the use of "total antioxidant capacity" assays for the in vitro assessment of antioxidant quality of food does not be employed by food industrials as a marketing argument or for the assessment of the "wholesomeness" of a food. [less ▲]

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See detailCervical artery dissections and type A aortic dissection in a family with a novel missense COL3A1 mutation of vascular type Ehlers-Danlos syndrome.
Makrygiannis, Georgios ULg; Loeys, Bart; Defraigne, Jean-Olivier ULg et al

in European journal of medical genetics (2015)

Cervical artery dissection (CeAD) is a rare condition. One of the causes is the vascular type of Ehlers-Danlos syndrome (vEDS). A novel missense mutation in COL3A1 was found in a young patient with CeAD ... [more ▼]

Cervical artery dissection (CeAD) is a rare condition. One of the causes is the vascular type of Ehlers-Danlos syndrome (vEDS). A novel missense mutation in COL3A1 was found in a young patient with CeAD as the single manifestation of vEDS. This is a heterozygous c.953G>A mutation in exon 14, disrupting the normal Gly-X-Y repeats of type III procollagen, by converting glycine to aspartic acid. [less ▲]

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See detailEffects of vitamin C, vitamin E, zinc gluconate, and selenomethionine supplementation on muscle function and oxidative stress biomarkers in patients with facioscapulohumeral dystrophy: a double-blind randomized controlled clinical trial.
Passerieux, Emilie; Hayot, Maurice; Jaussent, Audrey et al

in Free radical biology & medicine (2015), 81

Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disease characterized by progressive weakness and atrophy of specific skeletal muscles. As growing evidence suggests that oxidative ... [more ▼]

Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant disease characterized by progressive weakness and atrophy of specific skeletal muscles. As growing evidence suggests that oxidative stress may contribute to FSHD pathology, antioxidants that might modulate or delay oxidative insults could help in maintaining FSHD muscle function. Our primary objective was to test whether oral administration of vitamin C, vitamin E, zinc gluconate, and selenomethionine could improve the physical performance of patients with FSHD. Adult patients with FSHD (n=53) were enrolled at Montpellier University Hospital (France) in a randomized, double-blind, placebo-controlled pilot clinical trial. Patients were randomly assigned to receive 500 mg vitamin C, 400mg vitamin E, 25mg zinc gluconate and 200 mug selenomethionine (n=26), or matching placebo (n=27) once a day for 17 weeks. Primary outcomes were changes in the two-minute walking test (2-MWT), maximal voluntary contraction, and endurance limit time of the dominant and nondominant quadriceps (MVCQD, MVCQND, TlimQD, and TlimQND, respectively) after 17 weeks of treatment. Secondary outcomes were changes in the antioxidant status and oxidative stress markers. Although 2-MWT, MVCQ, and TlimQ were all significantly improved in the supplemented group at the end of the treatment compared to baseline, only MVCQ and TlimQ variations were significantly different between groups (MVCQD: P=0.011; MVCQND: P=0.004; TlimQD: P=0.028; TlimQND: P=0.011). Similarly, the vitamin C (P<0.001), vitamin E as alpha-tocopherol (P<0.001), vitamin C/vitamin E ratio (P=0.017), vitamin E gamma/alpha ratio (P=0.022) and lipid peroxides (P<0.001) variations were significantly different between groups. In conclusion, vitamin E, vitamin C, zinc, and selenium supplementation has no significant effect on the 2-MWT, but improves MVCQ and TlimQ of both quadriceps by enhancing the antioxidant defenses and reducing oxidative stress. This trial was registered at clinicaltrials.gov (number: NCT01596803). [less ▲]

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See detailIncidence and outcomes of acute kidney injury after cardiac surgery using either criteria of the RIFLE classification.
Lagny, Marc-Gilbert; Jouret, François ULg; Koch, Jean-Noel et al

in BMC nephrology (2015), 16(1), 76

BACKGROUND: Adult cardiac surgery is significantly associated with the development of acute kidney injury (AKI). Still, the incidence and outcomes of AKI vary according to its definition. Our ... [more ▼]

BACKGROUND: Adult cardiac surgery is significantly associated with the development of acute kidney injury (AKI). Still, the incidence and outcomes of AKI vary according to its definition. Our retrospective monocentric study comparatively investigates the yield of RIFLE definition, which is based on the elevation of serum creatinine levels (SCr) or the reduction of urine output (UO), taking into account only one or both criteria. Pre- and per-operative risk factors for post-operative AKI were evaluated. METHODS: All adult patients undergoing cardiac surgery, with or without cardiopulmonary bypass, from April 2008 to March 2009 were included. Clinical, biological and surgical features were recorded. Baseline serum creatinine was determined as its value on day 7 before surgery. Post-operative AKI was diagnosed and scored based upon the highest serum creatinine and/or the lowest urine output. RESULTS: 443 patients (Male/Female ratio, 2.3; median age, 69y) were included, with 221 (49.9 %) developing postoperative AKI. Elevated serum creatinine (AKISCr) and oliguria (AKIUO) was observed in 9.7 % and 40.2 %, respectively. AKI patients had a significantly higher BMI and baseline SCr. In comparison to AKIUO, AKISCr mostly occurred in patients with co-morbidities, and was associated with an increased mortality at 1-year post surgery. CONCLUSIONS: The use of standard RIFLE definition of AKI in a cohort of 443 patients undergoing cardiac surgery resulted in an incidence reaching 50 %. Still, significant discrepancies were found between AKISCr and AKIUO regarding the incidence and outcomes. In line with previous reports, our data questions the utility of urine output as a criterion for AKI diagnosis and management after cardiac surgery. [less ▲]

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See detailCirculating miRNA signature of PET-positive abdominal aortic aneurysms: new potential predictors of rupture
Courtois, Audrey ULg; Nusgens-Richelle, Betty ULg; HUSTINX, Roland ULg et al

in Atherosclerosis, Thrombosis and Vascular Biology (2015)

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See detailFamily Members of Patients with Abdominal Aortic Aneurysms are at Increased Risk for Aneurysms: Analysis of 618 Probands and their Families from the Liege AAA Family Study.
SakalihasanN, Natzi ULg; Defraigne, Jean-Olivier ULg; Kerstenne, Marie-Ange et al

in Annals of vascular surgery (2014), 28

BACKGROUND: The objectives were to answer the following questions using a well-characterized population in Liege, Belgium: 1) what percentage of abdominal aortic aneurysm (AAA) patients have a positive ... [more ▼]

BACKGROUND: The objectives were to answer the following questions using a well-characterized population in Liege, Belgium: 1) what percentage of abdominal aortic aneurysm (AAA) patients have a positive family history for AAA, 2) what is the prevalence of AAAs among relatives of AAA patients; and 3) do familial and sporadic AAA cases differ in clinical characteristics. METHODS AND RESULTS: Unrelated AAA patients diagnosed at the Cardiovascular Surgery Department, University Hospital of Liege, Belgium, between 1999 and 2012 were invited to the study. A detailed family history was obtained in interviews and recorded using Progeny software. In the initial interview 62 (10%) of the 618 AAA patients reported a positive family history for AAA. We divided the 618 patients into two study groups: Group I: 296 AAA patients (268; 91% males) were followed up with computerized tomography combined with positron emission tomography, and Group II: 322 AAA patients (295; 92% males) whose families were invited to ultrasonography screening. Ultrasonography screening identified 24 new AAAs among 186 relatives (>/= 50 years) of 144 families yielding a prevalence of 13%. The highest prevalence (25%) was found among brothers. By combining the number of AAAs found by ultrasonography screening with those diagnosed previously the observed lifetime prevalence of AAA was estimated to be 32% in brothers. The familial AAA cases were more likely to have a ruptured AAA than the sporadic cases (8% vs. 2.4%; P<0.0001). CONCLUSIONS: The findings confirm previously found high prevalence of AAA among brothers, support genetic contribution to AAA pathogenesis and provide rationale for targeted screening of relatives of AAA patients. [less ▲]

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See detailSex Differences in Abdominal Aortic Aneurysm: the Role of Sex Hormones.
Makrygiannis, Georgios ULg; Courtois, Audrey ULg; Drion, Pierre ULg et al

in Annals of vascular surgery (2014), 28(8), 1946-1958

Abdominal aortic aneurysm (AAA) is a complex multifactorial disease with genetic and environmental components. AAA is more common in males, whereas women have a greater risk of rupture and more frequently ... [more ▼]

Abdominal aortic aneurysm (AAA) is a complex multifactorial disease with genetic and environmental components. AAA is more common in males, whereas women have a greater risk of rupture and more frequently have concomitant thoracic aortic aneurysms. Moreover, women are diagnosed with AAA about 10 years later and seem to be protected by female sex hormones. In this MEDLINE-based review of literature we examined human and animal, in vivo and in vitro studies, to further deepen our understanding of the sexual dimorphism of AAA. We focus on the role of sex hormones during the formation and growth of AAA. Endogenous estrogens and exogenous 17beta-estradiol were found to exert favorable actions protecting from AAA in animal models, whereas exogenous hormone replacement therapy in humans had inconclusive results. Androgens, known to have detrimental effects in the vasculature, in sufficient levels maintain the integrity of the aortic wall through their anabolic actions and act differentially in males and females, whereas lower levels of testosterone have been associated with AAA in humans. In conclusion, sex differences remain an important area of AAA research, but further studies especially in humans are needed. Furthermore, differential molecular mechanisms of sex hormones constitute a potential therapeutic target for AAA. [less ▲]

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See detailLa prothèse valvulaire idéale n’existe toujours pas. Quels facteurs entrent en compte pour orienter les choix d’une valve mécanique ou biologique ?
GREGOIRE, Céline ULg; Nellessen, Eric; Defraigne, Jean-Olivier ULg et al

in Revue Médicale de Liège (2014), 69(11), 600-604

The prevalence of valvular heart diseases reaches 2.5% in the overall population. Aortic valve replacement is one of the most common surgical procedures. We report the story of a female patient whose ... [more ▼]

The prevalence of valvular heart diseases reaches 2.5% in the overall population. Aortic valve replacement is one of the most common surgical procedures. We report the story of a female patient whose aortic mechanical valve, implanted at the age of 54 years at the time of a mitral valve repair surgery, had to be replaced 14 years later, due to the development of a subvalvular pannus narrowing the valvular orifice. We use this clinical story to compare the advantages and disadvantages of repair surgery and valve replacement with a biological or mechanical prosthesis, and summarize the latest evidence for the choice of the most adequate prosthesis for a particular patient’s profile. [less ▲]

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See detailPreliminary data from the Liège Screening programme suggests the reported decline in AAA prevalence is not global
Makrygiannis, Georgios ULg; EL HACHEMI, Mounia ULg; Labalue, Philippe et al

in Aorta (2014, October 01), 2(5), 212253

Background: Population based studies have shown evident benefit in terms of mortality from screening for Abdominal Aortic Aneurysm (AAA) among men aged over 65. However, recent studies from USA, UK and ... [more ▼]

Background: Population based studies have shown evident benefit in terms of mortality from screening for Abdominal Aortic Aneurysm (AAA) among men aged over 65. However, recent studies from USA, UK and Sweden suggest a decrease in the prevalence of AAA in the general population. Whether these findings are generalizable for the rest of Europe is unknown. Thus we decided to set up a screening program in order to detect AAA in Liege, Belgium. Material and Methods: During our ongoing study, over a first 3-month period, abdominal aortic ultrasound was performed on 541 participants, (198 women 343 men) to measure the maximal suprarenal and infrarenal aortic outer-outer diameter as well as the maximal diameter of the common iliac arteries. Moreover, we have measured arm and ankle blood pressure in each subject and the clinical characteristics of the patients, were collected. Results: The overall AAA prevalence was 4.62% (n = 25). In female participants aged ≥ 74 years the AAA prevalence amounted 1.01 %. While in male patients aged ≥ 65 years, it rose to 6.71%. Statistical analysis showed that male gender, aging, history of ischemic heart diseases, hyperlipidemia and varicose veins were significantly associated with AAA. Conclusion: Despite a reported declining prevalence of AAA in some recent population-based studies, we found that the prevalence of AAA in Liège population remains high in men aged 65 years or more. The prevalence of AAA seems to vary in different geographical regions. However, we need a larger sample to confirm our preliminary findings. [less ▲]

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See detailPREVENTION OF INCISIONAL HERNIA AFTER MIDLINE LAPAROTOMY FOR ABDOMINAL AORTIC ANEURYSM TREATMENT: A RANDOMIZED CONTROLLED TRIAL
Muysoms, F; Vierendeels, T; Huyghe, M et al

Conference (2014, September 11)

Background: The incidence of incisional hernias (IH) after open abdominal aortic aneurysm (AAA) repair is high. Prophylactic mesh augmentation (PMA) during laparotomy closure has been proposed in high ... [more ▼]

Background: The incidence of incisional hernias (IH) after open abdominal aortic aneurysm (AAA) repair is high. Prophylactic mesh augmentation (PMA) during laparotomy closure has been proposed in high-risk patients. Methods: A multicenter prospective randomized controlled study was conducted on patients undergoing elective repair of AAA through midline laparotomy (Clinical.Trials.gov: NCT00757133). In the study group a retro-muscular PMA was performed with a large-pore polypropylene mesh (Ultrapro™, width 7.5 cm). The primary endpoint was the incidence of IH at 24 months. Results: Between February 2009 and January 2013, 120 patients were recruited at 8 Belgian centers. Patients' characteristics at baseline were similar between the groups. Operative and postoperative characteristics showed no difference in morbidity or mortality. A highly significant reduction of IH incidence was found after PMA compared to conventional closure, respectively 0% (CI: 0 % - 5.5%) versus 27.6% (CI: 16.7% - 40.9%) (P<0.0001; Fisher's exact test). The estimated "freedom of IH" curves (Kaplan-Meier estimate) were significantly different across study arms (X2=18.93, P<0.0001; Mantel-Cox test). No adverse effects were observed, apart from an increased mean (SD) time to close the abdominal wall for PMA: 46.2 min (18.6) versus 29.6 min (18.5) (P<0.001; Mann-Whitney U test). Conclusion: Prophylactic retro-muscular mesh augmentation of a midline laparotomy in AAA patients is safe and effectively prevents the development of IH, with an extra time investment of 17 minutes. [less ▲]

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See detailDu processus aux soins intégrés : expérience de gestion de projet bottom-up
ERPICUM, Marie ULg; BASSLEER, Bernard ULg; Defraigne, Jean-Olivier ULg et al

Conference (2014, July 08)

Implementation of blood conservation strategies is a current issue in a public health view, especially in cardiac surgery. A service project has been initiated in the cardiovascular department of the CHU ... [more ▼]

Implementation of blood conservation strategies is a current issue in a public health view, especially in cardiac surgery. A service project has been initiated in the cardiovascular department of the CHU of Liege aiming to develop a blood conservation program. This project has evolved into the creation of a clinical pathway of the cardiac surgery patient and then into an institutional model for the development of other clinical pathways. This evolution leads to meet with the missions and strategic objectives of the Institution and some national projects. The process of this approach weaves a horizontal and vertical grid. The multidisciplinary membership, supported by medical and nursing leadership and the institutional support, will determine the sustainability of this project. [less ▲]

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