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Dissertation
Niet-lineair gedrag in een optische versterker en laser diode gebaseerd terugkoppelingsschema
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ISBN: 9789085781769 Year: 2007 Publisher: Gent Universiteit Gent. Faculteit Ingenieurswetenschappen

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Dissertation
Experimentele studie van signaaldegradatie en optische regeneratie in 10 Gbit/s optische vezellinks
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Year: 2002

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Dissertation
Hoe kan men een optimaal beheer(s)baar draadloos netwerk opzetten?
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Year: 2019 Publisher: Kortrijk : Howest, departement professionele bachelors,

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Postconditioning the heart in diabetes and the metabolic syndrome : a multimodal evaluation and the therapeutic implications of postconditioning myocardial tissue in diabetes mellitus type II and the metabolic syndrome
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ISBN: 9789461651686 Year: 2015 Volume: 680 Publisher: Leuven Leuven University Press


Dissertation
Arteriovenous Fistulae in Chronic Kidney Disease and the Heart: Physiological, Histological, and Transcriptomic Characterization of a Novel Rat Model
Authors: --- ---
Year: 2022 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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Background: Cardiovascular and kidney disease often coexist and perpetuate each other, significantly increasing morbidity and mortality. Arteriovenous fistulae (AVF) are the gold standard for vascular access in those requiring hemodialysis, but may put an extra hemodynamic stress on the cardiovascular system. The complex interactions between the heart, kidney, and AVF remain incompletely understood. Methods and Results: We characterized the response of the heart and kidneys to 5/6th partial nephrectomy (NX) and AVF in a novel rat model. NX induced increases in urea, creatinine, and hippuric acid. The addition of an AVF (AVF+NX) further increased urea and a number of uremic toxins such as trimethylamine N-oxide (TMAO), and led to increases in cardiac index, left and right ventricular volumes, and right ventricular mass. Plasma levels of uremic toxins correlated well with ventricular morphology and function. Heart transcriptomes identified altered expression of 8 genes following NX and 894 genes following AVF+NX, whereas 290 and 1431 genes were altered in the kidney transcriptomes, respectively. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis revealed gene expression changes related to cell division and immune activation in both organs, suppression of ribosomes and transcriptional activity in the heart, and altered renin-angiotensin signaling as well as chronodisruption in the kidney. All except the latter were worsened in AVF+NX compared to NX. Deconvolution analysis revealed increases in the proportion of certain types of white blood cells in the heart and kidney. Conclusions: In a rat model, we established that inflammation and organ dysfunction in chronic kidney disease are exacerbated following application of an AVF. These factors may drive the increased cardiorenal morbidity and mortality observed in the population undergoing hemodialysis. Furthermore, our study provides important information for the discovery of novel biomarkers and therapeutic targets in the management of cardiorenal syndrome.

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Dissertation
Sternal wound infections after coronary artery bypass grafting in diabetes patients: must hemoglobin A1c influence our conduit choice?
Authors: --- ---
Year: 2019 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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Background Diabetes patients are more likely to develop sternal wound infection (SWI) after coronary artery bypass grafting (CABG), but it is still unclear whether an elevated hemoglobin A1c (HbA1c) plays a role in the increased risk of SWI in this patient population. Methods We conducted a retrospective cohort study at a large referral center. All patients who had undergone off-pump coronary artery bypass surgery in 2010‒2016 were eligible for inclusion. We looked at the incidence of SWI and we evaluated the association between HbA1c and SWI in diabetes patients. Results We included 1,316 non-diabetes and 458 diabetes patients. Postoperative SWI occurred in 133 (10%) of non-diabetes and 82 (18%) of diabetes patients (p < 0.001). Grade 3 SWI occurred in 2.5% of non-diabetes and 7.2% of diabetes patients (p < 0.001). The incidence of other grade SWIs was similar in both patient groups. An elevated HbA1c was associated with an increased risk of SWI (OR = 1.25, 95% CI: 1.04–1.5) and higher-grade SWI (OR = 1.25, 95% CI: 1.05–1.5) in diabetes patients. Pedicled harvesting of the internal thoracic artery (ITA) was associated with a higher risk of SWI compared to skeletonized ITA harvesting in diabetes patients (OR = 2.4, 95% CI: 1.2–4.7). Conclusion An elevated HbA1c predicted SWI after CABG in diabetes patients. Skeletonized ITA harvesting was associated with a lower risk of SWI compared to pedicled ITA harvesting in diabetes patients. Further research is warranted to see how our findings may translate to clinical practice.

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Dissertation
Hybrid Coronary Revascularization in Robotically Assisted MIDCAB
Authors: --- --- ---
Year: 2021 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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Background: The hybrid procedure is a promising strategy for myocardial revascularization where PCI and MIDCAB are combined. It is currently unclear whether perioperative PCI is associated with increased complication rates compared to surgery only. The aim of this study was to evaluate outcomes after hybrid revascularization. Methods: Data from 249 patients who underwent MIDCAB surgery at the University Hospitals of Leuven between July 2015 and June 2019 were reviewed. Demographic variables, cardiovascular history and following outcome parameters were collected: hospital stay, hemoglobin change, peak troponin perioperatively, total drainage, complications, graft failure, reintervention for bleeding, MACCE, MI, stroke, repeat revascularization and mortality. P-values <0.05 were deemed statistically significant. Results: Of the 249 patients, 179 patients underwent MIDCAB only and 70 underwent hybrid revascularization. There were no significant differences in outcome parameters and also MACCE-free survival was comparable between both groups (MIDCAB only 6.7% vs hybrid 4.3%, p=0.471). When comparing the patients who received DAPT (n=65) with the ones who did not (n=184), the DAPT group had a larger perioperative hemoglobin fall (non-DAPT -1.5 vs DAPT -1.8 g/dL, p=0.033) and worse one- year MACCE-free survival (4.3% vs 10.8%, p=0.061). Conclusion: In this large cohort of patients, the outcomes and complication rates after hybrid revascularization were not inferior to MIDCAB only. Therefore, this minimal invasive method might be a valuable option in high-risk patients for conventional surgery.

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Dissertation
Patient Satisfaction: Initial MIDCAB Patients
Authors: --- ---
Year: 2019 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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Minimal Invasive Direct Coronary Artery Bypass (MIDCAB) surgery by a left anterolateral thoracotomy (MIDCAB) might be more beneficial than Off-Pump Coronary Artery Bypass (OPCAB) due to better short-term outcomes, return to full functioning capacity, decreased rates of infection, decreased pain and improved cosmetic result. This study is a retrospective evaluation of the quality of life of patients with an off-pump coronary bypass by either anterolateral thoracotomy or median sternotomy. Patient satisfaction was examined by using a shortened CROQ-questionnaire at 4 weeks postoperatively, questioning 8 aspects: cardiac symptoms, angina medication, chest pain, general impact on life, daily limitations, social impact, personal impact and cognitive impairment. RESULTS: Response was obtained from 83 MIDCAB patients and 99 OPCAB patients. Significant difference was found for angina medication (U = 3663.00, p = 0.045) and general impact on daily life ( U = 3373.50, p = 0.027). There was no difference for the other aspects of patient satisfaction. Minimal invasive coronary bypass without cardiopulmonary bypass by a left anterolateral thoracotomy results in better patient satisfaction compared to conventional sternotomy. These results strengthen our trust in the MIDCAB-procedure and allow physicians to better counsel benefits and differences between both procedures. We stress that our population is small and our results only hypothesis-generating. A larger validation study is required to confirm these findings.

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Dissertation
Robotic-assisted minimally invasive direct coronary artery bypass grafting versus off-pump coronary artery bypass grafting: a retros pective cohort study
Authors: --- ---
Year: 2022 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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Introduction Robotic-assisted minimally invasive direct coronary artery bypass grafting (RA-MIDCAB) combines a minimal invasive approach with a robotic technique and therefore might improve clinical outcomes compared to an open sternotomy approach. RA-MIDCAB has already proven to be efficacious and safe, but studies directly comparing RA-MIDCAB and off pump coronary artery bypass grafting (OPCAB) are limited. This study aimed to compare the clinical outcomes of OPCAB and RA-MIDCAB. Patients and methods This retrospective cohort study collected data from 1100 OPCAB patients and 431 MIDCAB patients, operated in the university hospital Leuven between January 2015 and July 2021. Propensity score matching was used to account for selection bias. As primary outcome measures this study compared overall survival and MACCE-free survival. As secondary outcome measures the length of hospital and intensive care unit (ICU) stay and other postoperative complications were assessed. Results MACCE-free survival and overall survival did not significantly differ between both groups before or after matching. Length of hospital and ICU stay was significantly shorter in the RA-MIDCAB group before and after matching. No significant difference was found in need for thoracocentesis, need for pericardiocentesis and postoperative de novo atrial fibrillation before or after matching. Need for reoperation was significantly lower in RA-MIDCAB before matching, but was similar after matching. Conclusion This study concludes that, when accounted for possible confounders, no clear differences were found in overall survival and MACCE-free survival between RA-MIDCAB or OPCAB. However, RA-MIDCAB has a faster hospital and ICU discharge and can be seen as a safe and less invasive alternative for OPCAB.

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Dissertation
Hybride aanpak van multivessel coronary diseases met RACAB en PCI
Authors: --- ---
Year: 2019 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

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INLEIDING: CABG en PCI spelen beiden een rol in de behandeling van coronary multivessel disease maar ze hebben beiden hun beperkingen. Hybride coronaire revascularisatie (HCR), waarbij minimaal invasieve robot geassisteerde coronaire bypass (RACAB) wordt gecombineerd met percutane coronaire interventie (PCI), zou een alternatief kunnen vormen voor CABG in de behandeling van multivessel coronary artery disease. Het doel van deze studie was analyse van de outcome van een patiëntenpopulatie die HCR onderging, alsook van de RACAB-procedure , dewelke werd gebruikt in de HCR groep. De bekomen resultaten werden vergeleken met een groep die conventionele OPCAB onderging. METHODEN: In deze retrospectieve studie analyseerden we de gegevens van 271 personen met symptomatische coronaire multivessel disease die een chirurgische behandeling kregen onder de vorm van OPCAB, RACAB of HCR. RESULTATEN: Van de 271 patiënten ondergingen er 25 (9,2%) HCR, 125 (46,1%) enkel RACAB, 81 (29,9%) OPCAB en 40 (14,8%) OPCAB LIMA/LAD op geskeletoniseerde wijze. HCR en de RACAB-procedure resulteerde in lagere postoperatieve hemoglobinedaling, minder gevallen van de novo VKF, lagere incidentie van wondproblemen en lagere incidentie van urineweginfecties in vergelijking met OPCAB. Er was geen significant verschil in hospitalisatieduur tussen HCR en OPCAB. Overall survival na HCR was na 3 jaar >96%. In de patiëntenpopulatie die HCR of RACAB onderging, werden er tijdens follow-up geen gevallen van angor gerapporteerd. CONCLUSIE: HCR vormt een veelbelovend alternatief voor conventionele CABG in de behandeling van coronary multivessel disease. Aangezien huidige evidence voornamelijk steunt op retrospectieve data, is er nood aan prospectieve studies.

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