Jacques Verbist

University of Namur | FUNDP · Department of Chemistry

Carbon fibres have been plasma treated by acrylonitrile (AN) to increase the compatibility with and the adhesion to an epoxy matrix. The plasma polymers have been analyzed by X-ray Photoelectron Spectroscopy (XPS) and Infrared Spectroscopy (IR). The effect of plasma power level is also studied

Unlabelled: Aim of the study was to report a novel hybrid technique for multilevel arterial lesions of the lower extremities and to evaluate the clinical outcomes. In patients with multilevel arterial disease, the combined (hybrid) treatment, consisting of endovascular intervention and classical surgical intervention on the same vascular axis seem...

Stents have been created to prevent vessel recoil after percutaneous transluminal angioplasty (PTA). Despite the evolution in stent design, intimal hyperplasia and stent fractures and the resulting in--stent restenosis (ISR) still occur. Different strategies to treat ISR have been described with variable results in patency rates in the short and th...

The purpose of this article was to obtain a more clear view in the management of popliteal artery aneurysms (PAAs). When do we need to treat it and how is it best treated? After going through multiple review articles and case reports concerning this matter, we came to the following conclusions. Repair of a PAA is indicated when it reaches a postero...

The endovascular approach has known a great evolution in terms of vessel patency and treatment possibilities. Longer and more complex lesions with a difficult anatomy can be addressed by a range of endovascular tools. However, to maintain the patency of the treated lesion is the true challenge. In order to fulfill these long-term expectations, newe...

OBJECTIVES: ACST-2 is currently the largest trial ever conducted to compare carotid artery stenting (CAS) with carotid endarterectomy (CEA) in patients with severe asymptomatic carotid stenosis requiring revascularization. METHODS: Patients are entered into ACST-2 when revascularization is felt to be clearly indicated, when CEA and CAS are both p...

We report a case of a spontaneous rupture of a right subclavian aneurysm in a 15 year-old patient. This ruptured aneurysm was successfully treated in an endovascular manner by placing a covered stent-graft in the right subclavian artery via right brachial access. Subsequent work-up by skin biopsy and fibroblast culture and by DNA- screening reveale...

The medical history of a 60-year-old man with chronic alcohol abuse who presented with massive rectal bleeding, is reported. The clinical examination revealed a hemodynamically unstable patient with a heart rate of 125 beats per minute and a blood pressure of 88/64 mmHg. Palpation of the abdomen was supple. Subsequently, a CT angiography was perfor...

The treatment of femoropopliteal lesions has known an important evolution in the last years. An important limitation of current endovascular therapy remains the occurrence of restenosis. In order to minimize restenosis rates, drug eluting technologies are evolving. The use of drug-eluting stents (DES) in coronary arteries shows beneficial results,...

The BRAVISSIMO study is a prospective, non-randomized, multi-center, multi-national, monitored trial, conducted at 12 hospitals in Belgium and 11 hospitals in Italy. This manuscript reports the findings up to the 12-month follow-up time point for both the TASC A&B cohort and the TASC C&D cohort. The primary endpoint of the study is primary patency...

WHAT THIS PAPER ADDS The need for a large-scale randomized trial comparing CEA versus CAS: A Cochrane meta-analysis of CEA versus CAS trials (mainly in symptomatic patients) states “There is a strong case to continue recruitment in current randomized trials comparing carotid stenting with endarterectomy”. Multicentre large clinical trials are parti...

When vascular surgeons have the choice between a polytetrafluoroethylene and a venous graft in femoropopliteal surgery above the knee, the majority still chooses the first one. Its use indeed reduces the operation time and provokes less wound problems. Moreover, by using the polytetrafluoroethylene graft, the saphenous vein can be spared for other...

Stents were created as a mechanical scaffold to prevent vessel recoil and luminal renarrowing after percutaneous transluminal angioplasty (PTA). In femoropopliteal arteries, indication for stent implantation remains a topic much debated on, especially in long lesion configurations. Ever since the first stents were introduced on the market, in-stent...

Ever since its introduction, one of the major limitations of endovascular therapy is the occurrence of restenosis after treatment. Factors contributing to loss of primary patency after percutaneous transluminal angioplasty (PTA) due to balloon injury are negative arterial remodeling, excessive neointimal proliferation and elastic recoil. In order t...

Non-aneurysmatic aberrant right subclavian artery is a rare cause of dysphagia. We report a case of a 65-year-old female patient having a symptomatic lusorian artery. We reviewed literature as for indications and operative techniques for type I lusorian arteries. Different types of surgical approaches have been reported but there is no consensus to...

With subintimal recanalization, a channel is deliberately created by dissecting the vessel wall in order to replace the native occluded lumen. This is opposed to intraluminal recanalization, where passage of an arterial obstructive lesion is performed by central luminal navigation. Both intraluminal and subintimal treatment has its proponents and a...

Critical limb ischemia (CLI) is affecting an increasing number of patients, mainly due to an ageing population and the growing number of diabetics. Clinically, CLI is characterized by rest pain, non-healing foot wounds and gangrene, due to insufficient arterial blood supply. Limb preservation should be the goal in patients with diabetic foot due to...

The BRAVISSIMO study is a prospective, non-randomized, multicenter, multinational, monitored trial, conducted at 12 hospitals in Belgium and 11 hospitals in Italy. This manuscript reports on the BRAVISSIMO TASC A&B iliac lesion cohort, based on data collected up to the 13-month time point. The primary endpoint of the study is primary patency at 12...

The fear that early thrombosis and late luminal loss due to intimal hyperplasia formation potentially leads to insufficient long-term patency rates can explain the reluctance on implanting stents in small diameter below-the-knee (BTK) arteries. Drug-eluting stent (DES) technology was developed to prevent early thrombosis and late luminal loss to po...

LiCl.C5H5N crystallizes in the orthorhombic system, space group P212121; a = 8.61, b = 17.92, c = 4.02 Å, Z = 4. The structure has been determined by heavy atom method using 579 reflections of the (hk0), (hk1) and (hk1) planes, refined by Fourier synthesis and least squares method to an R index of 0.161. Each lithium ion is tetraedrically surrounde...

The structure of Lil.2(NH2)2CO has been determined by three-dimensional X-ray analysis. Space group C2/c; a = 11.40, b = 14.38, c = 5.23 Å, β = 101.5° Z = 4.Li+ is surrounded by four O each urea being linked to two Li+. The chains (Li+.2 urea)n so formed are held together by means of N-H…I− bonds.

Diglycine hydro‐iodide is monoclinic, space group C2 with unit cell parameters a = 18.592, b = 5.160, c = 20.372 Å. β = 110.64°; Z = 8. The crystal structure has been determined using three‐dimensional diffractometer data. The asymmetric part of the unit‐cell contains two independent iodine ions, two glycinium ions NH 3 ⁺ CH 2 COOH and two zwitter‐...

X-ray photoelectron spectroscopic investigations have been performed on phthalocyanine and naphthalocyanine samples previously exposed to thionyl chloride or dissolved into thionyl chloride solutions. With Fe and Mo compounds, fast oxidation of the central metal has been observed, and the data illustrate the dissociative character of the SOCl2 chem...

The electronic structure of dimethyl disulfide and naphthalene 1,8-disulfide has been investigated by means of ab initio calculations. Theoretical results are compared with high resolution ESCA valence band spectrum of solid dimethyl disulfide. Semiconducting properties are predicted for planar aromatic disulfides.

In-stent restenosis has always been an important issue, since the launch of the first stents on the market. The occurrence of in-stent restenosis (ISR) is due to two main reasons. First, the presence of stent fractures significantly influences restenosis rates. Second, the continuous interaction between the permanently implanted artificial material...

Patients with cerebral ischemia as a result of acute cervical internal carotid artery occlusion are generally considered to have a poor prognosis. Despite maximal medical treatment, a better treatment for patients with acute ischemic stroke who present with serious neurologic symptoms on admission or continue to deteriorate neurologically due to a...

Acute limb ischemia (ALI) refers to a rapid worsening of limb perfusion resulting in rest pain, ischemic ulcers or gangrene. With an estimated incidence of 140 million/year, ALI is serious limb-threatening and life-threatening medical emergency demanding prompt action. Three prospective, randomized clinical trials provide data on trombolytic therap...

Drug-eluting stent (DES) technology was developed to prevent early thrombosis and late luminal loss to potentially improve long-term patency rates. Although favorable DES results have recently become available with the Zilver PTX and STRIDES studies, the high price of DES is a major drawback for this technology to become the golden standard for per...

Several limitations inherent to the implantation of a metallic device, such as the occurrence of in-stent re-stenosis, in an arterial lumen intuitively explain the interest for developing bio-absorbable stents. Two main types of bio-absorbable stents currently exist: polymer stents and metallic stents. To date, no studies with bio-absorbable stents...

Stents are an alternative treatment to carotid endarterectomy for symptomatic carotid stenosis, but previous trials have not established equivalent safety and efficacy. We compared the safety of carotid artery stenting with that of carotid endarterectomy. Methods The International Carotid Stenting Study (ICSS) is a multicentre, international, rando...

Isolated iliac aneurysms are uncommon and account for only 2% of all abdominal aneurysms. Typically, patients presenting with this pathology are operated on surgically. In our patient, however, surgery could have been an option but the patient had undergone a laparotomy more than 50 years earlier because of a gun-shot wound, so we preferred an endo...

Critical limb ischemia (CLI) is an endstage manifestation of peripheral artery disease (PAD) and typically describes patients with ischemic rest pain (Rutherford Category 4), or patients with ischemic skin lesions, either ulcers or gangrene (Rutherford Category 5-6). CLI due to infrapopliteal lesions is often not a good indication for infragenicula...

The application of percutaneous techniques for the treatment of peripheral arterial occlusive disease (PAOD) has gained widespread interest over the last decade. Together with the development of new endovascular tools and with an increasing operator experience, the minimal invasive percutaneous therapy became first line therapy at many institutions...

Aim. Expanded polytetrafluoroethylene (ePTFE) grafts are commonly used for treatment of infrainguinal arterial occlusive disease. Especially in below-knee (BK) reconstructions, patency is often inferior to the outcome in patients eligible for venous bypass grafting. This study assesses whether the Carmeda® BioActive Surface (CBAS), which employs co...

The importance of angioplasty and stenting in the treatment of carotid artery disease cannot be underestimated. Successful carotid stenting does not only depend of the operator's skills and experience, but also an adequate selection of cerebral protection devices and carotid stents can help avoiding neurological complications. A broad spectrum of c...

The current evolution towards treating more complex femoropopliteal lesions as seen in the renewed TASC II recommendations clearly reflects the continuous evolutions in femoropopliteal stent design. Recent stent design improvements focus on decreasing stent fractures rates which can negatively impact patency rates. By rearranging strut alignment to...

We investigated the efficacy of Xpert (Abbott Vascular Devices) nitinol stents for the treatment of infrapopliteal lesions in patients with critical limb ischemia (CLI). Between May and October 2005, 47 CLI patients (35 men, mean age 73 years) received 67 Xpert stents for the treatment of 58 infrapopliteal lesions in 51 limbs; 43 patients (84.3%) w...

The aim of this study was to identify predictive risk factors for complications during and after carotid artery stenting (CAS). A multivariate analysis was performed on the databases of 4 European high-volume centers regarding risk factor distribution between patients presenting with or without neurological complications 30 days after CAS. The cumu...

To identify if carotid stent design, especially free cell area, impacts on the 30-day rates for stroke, death and TIA after carotid artery stenting (CAS). A CAS database of 3179 consecutive CAS patients was retrospectively assessed. The distribution of neurological complications were analysed for association with the different stent types and desig...

A brief review is presented of the last ten years of research on the study of the electronics and vibrational properties of organic molecular crystals by means of electron spectroscopies (x-ray photoelectron spectroscopy, synchrotron and classical UV photoemission, electron induced vibrational spectroscopy). It is suggested that polymers might also...

Peripheral stents aim to support revascularization procedures for intravascular stenoses by mechanically preventing vessel recoil and counteracting the pathophysiological process of luminal renarrowing triggered by procedural injury to the vessel wall. Despite improvements in stenting techniques and concomitant medication, repeated intervention due...

The aim of this study was to evaluate the technical feasibility and safety of implanting a polytetrafluoroethylene (PTFE) covered balloon expandable stent to treat iliac artery stenoses and occlusions. Additionally, the primary patency and clinical and hemodynamic efficacy at 1 year were analysed. This nonrandomized, prospective study involved pati...

By comparison of the E.S.C.A. valence band spectra recorded in the solid phase for polyacenes (benzene, naphthalene, anthracene, and tetracene) with gas phase results, important energy parameters (energy gap, work function) of these compounds have been obtained. The trends observed in the evolution of the main C1s shake-up positions and intensities...

Valence band X-ray photoelectron spectra of the rutile oxides TiO2, RuO2, and IrO2 show a distinct evolution as a function of the increasing number of metal d-electrons. The observations are found to be in excellent agreement with recent theoretical models. Intensity analysis and photo-ionization cross sections are used to confirm the nature of the...

The electronic structure (core and valence levels) of various simple polymers has been investigated by ESCA (Electron Spectroscopy for Chemical Analysis), with the aid of original EHCO (Extended Hückel Crystalline Orbitals) calculations giving corresponding density of states and band structure schemes. Simple monosubstituted homopolymers derived fr...

The importance of cerebral protection during carotid artery stenting (CAS) cannot be underestimated. To date, 3 different techniques have been developed to secure CAS from neurological complications. These are defined as: distal occlusion devices, distal filter devices and proximal occlusion devices. All cerebral protection devices have proven to s...

Peripheral stents aim to support revascularization procedures of intravascular stenoses by mechanically preventing vessel recoil and counteracting pathophysiologic processes of luminal re-narrowing triggered by procedural injury of the vessel wall. Despite improvements in stenting techniques and concomitant medication, repeated intervention due to...

Expanded polytetrafluoroethylene (ePTFE) grafts are commonly used for femoropopliteal (FP) and femorocrural (FC) bypass grafting. Especially in below-knee (BK) reconstructions, patency is often inferior to the outcome in patients eligible for venous bypass grafting. This study assesses whether the Carmeda BioActive Surface (CBAS), which employs cov...

Carotid artery stenting (CAS) is an efficient treatment modality for patients suffering of carotid arterial occlusive disease (CAOD). However, careless patient selection can result in poor CAS outcome. Therefore, it is of the utmost importance that treatment be performed under optimal conditions by the person best capable of performing the procedur...

Aim. Expanded polytetrafluoroethylene (ePTFE) grafts are commonly used for femoropopliteal (FP) and femorocrural (FC) bypass grafting. Especially in below-knee (BK) reconstructions, patency is often inferior to the outcome in patients eligible for venous bypass grafting. This study assesses whether the Carmeda(R) BioActive Surface (CBAS), which emp...

The aim of this paper was to evaluate the mid-term results of remote endarterectomy and balloon-expandable, radially reinforced ePTFE endograft uplining of the superficial femoral artery (SFA) for long occlusions. One hundred and two limbs in 92 patients were included in this prospective, multicenter study. Indications were disabling claudication (...

The individual characteristics of a stent may make it an attractive choice in some circumstances, but render it a less desirable option in others. The applicability depends primarily on the arterial anatomy and the specific details of the lesion being treated. A careful assessment by the interventionalist is required to select the proper type of st...

We investigated the safety and efficacy of sirolimus-eluting stents in the treatment of patients with severe below-the-knee' critical limb ischemia. Between October 2004 and January 2005 we performed 20 percutaneous transluminal angioplasty procedures on 18 patients (7 female, 11 male, mean age 72.8 years), implanting 24 sirolimus-eluting stents. A...

The authors wish to describe a combined open and endovascular approach to repair a complex thoracic aortic aneurysm. A 72-year-old man with chronic obstructive pulmonary disease, aortic valvular insufficiency and diffuse thoracic aortic aneurysm underwent aortic valve and ascending aorta replacement by a Bentall-procedure and replacement of arch an...

Because of the focal nature of stenoses or occlusions in the supra-aortic vasculature, the high blood-pressures in this area and the very low morbidity rates related to percutaneous therapy have largely replaced surgical revascularization as the initial treatment of choice for patients with supra-aortic arterial occlusive disease. The initial techn...

Although the first long-term results of Carotid Artery Stenting (CAS) became available only recently, CAS has become an accepted treatment for carotid artery disease. We report CAS data up to 5 years, both late stroke rate and patency rates as observed in 4 high-volume European centers. Between February 1, 1993 and December 31, 2004, 2 172 patients...

Current stent technology is based on the use of permanent implants that remain life long in the vessel wall, far beyond the time required for the prosthesis to accomplish its main goals of sealing dissection and preventing wall recoil. With the possibility to implant long vessel segments using antiproliferative drugs to prevent restenosis, the prac...

Patient selection is of the utmost importance with all endovascular procedures. It is equally important to select the appropriate protection device during carotid angioplasty/stenting (CAS). CAS in two patients was unsuccessful due to the chosen protection device. Occlusion of the external carotid artery while deploying a Parodi Anti-Embolic-System...

Endoleaks currently present one of the major problems related to endoluminal treatment of abdominal aortic aneuryms (AAA). The incidence and fate of endoleaks stress the importance of long term follow-up. In this article the authors discuss which imaging techniques can best be used for surveillance and how endoleaks should be classified. Furthermor...

Three monomers with different degrees of unsaturation, 1-propanol, allyl alcohol, and propargyl alcohol, are plasma-deposited to obtain alcohol functions containing polymers. To obtain information on the behaviors of these monomers in the plasma, the polymers deposited in the reactor and in the postdischarge region are characterized by high-energy...

Application of an anodic potential under recycled argon atmosphere to a highly concentrated solution of N‐vinyl‐2‐pyrrolidone (5 mol.dm−3) allows to graft and polymerise the monomer onto a Pt or Au electrode. XPS, UPS and IRRAS spectroscopies reveal the presence of thin PVP films on these surfaces. XPS data point to the formation of C‐metal bonds...

The La1-xCexBO3 (B=Ti, Cr, Mn, Fe, Ni, Co) mixed oxides of perovskite structure present a catalytic activity for CO oxidation and No reduction which increases with increasing Ce content. LaCoO3 and LaMnO3 are the more active compounds for both CO oxidation and NO reduction. The oxidation of CO by O2 follows a suprafacial type mechanism where the ad...

UPS, Synchrotron Radiation and HREELS data on self-assembled alkanethiols are reported as a contribution to a general effort to assess the potential of electron spectroscopies in the elucidation of the primary and secondary structure of organic surfaces. The valence and vibrational spectra of linear alkane chains, cyclic structures and folded chain...

The surface chemistry of plasma-deposited films created from amine-functionalized saturated (propylamine) and unsaturated (allylamine and propargylamine) precursors has been investigated by high-energy resolution XPS, chemical derivatization, elemental analysis, and HREELS.XPS results show that nitrogen-rich deposits are obtained from unsaturated p...

O2 reduction has been investigated using rotating disc electrode and voltammetric techniques for naphthalocyanine CoNPc(2,3) impregnations supported on two kinds of carbon blacks according to the same procedure as that described by A. Biloul, O. Contamin, G. Scarbeek, M. Savy, B. Palys, J. Riga and J. Verbist, J. Electroanal. Chem., 365 (1994) 239....

Measurements of the X-ray photoelectron spectroscopy (Xp.s.) valence-band spectra of crystalline and amorphous poly(tetrahydrofuran) are reported. The experimental data are analysed on the basis of theoretically simulated Xp.s. valence-band spectra of model molecules. Differences in the spectra of poly(tetrahydrofuran) in amorphous and crystalline...

PET (Polyethylene terephthalate) films were modified with two different plasmas, nitrogen and oxygen, as a function of treatment times and RF powers. Firstly, the chemical composition of the plasma-modified PET films was investigated by XPS. In the case of nitrogen plasma, the formation of amine, imine and amide groups is detected. A slight diffusi...

Valence XPS studies of well oriented polyethylene mats, deposited on a gold substrate, provide direct evidence of the existence of the fold structure at the sample surface and confirm earlier suggestions that conformation is directly fingerprinted in that energy region of the spectra. These results also provide new insight into the origin of the va...

The surface properties of thin polystyrene films are deeply modified by the addition of various amounts of a poly(styrene-b-dimethylsiloxane) copolymer-or poly(S-b-DMS)-as confirmed by a series of analytical methods. In addition to the surface tension which has been estimated from wettability and contact angle measurements, surface composition has...

The deposition of CeO2 on Si(111) has been studied by low energy electron diffraction (LEED), Auger electron spectroscopy (AES), x-ray photoelectron spectroscopy (XPS) and Rutherford backscattering spectroscopy (RBS). LEED shows the CeO2 layer to grow in the (111) orientation. The formation of a silicon oxide layer at the interface is observed. The...

O2 reduction was investigated using rotating disk electrode and voltammetry techniques on NPcCo(1,2) impregnations deposited onto two kinds of carbon black support. They were selected on the basis of their similar pH and dibuthylphthalate (DBP) adsorption values. Samples were also characterized by IR and X-ray photoelectron spectroscopy techniques....

form only given. Leucoemeraldine nitrogen amine has been oxidised by air and pure oxygen, and studied by X-ray Photoelectron Spectroscopy (X.P.S.). We discovered that the higher concentration in pure oxygen does not accelerate the oxidation process. Therefore, the air moisture has a great role in this phenomenon. The dopant concentration of the pro...

Oligomers and polymers of aniline have been synthesized by organic and electrochemical ways respectively. The electronic structure of the base forms of these materials has been investigated by XPS using a SCIENTA 300 spectrometer for films study and a HP 5950A for powders. The two componants of the N1s core level peak (related to amine and imine ni...

The chain conformations at the surface of poly(ethylene terephthalate) (PET) with amorphous and crystalline (bioriented film) morphologies are characterized by means of IR-ATR spectroscopy. Experimental XPS valence bands are analysed with the help of theoretically simulated XPS valence band spectra for model molecules of PET chains in different con...

Dynamic mechanical and thermal analysis (DMTA) has been used to study the effects of surface treatment of carbon fibres on the viscoelastic properties of composites containing them. The fibres were treated by dip-coating, electro-polymerization, and plasma polymerization, and the behaviour of these fibres is compared with that of fibres treated by...

O2 reduction in an acid medium has been investigated on a transition metal macrocycle, CoNPc(1,2), impregnated on a carbon black support with a high dibutylphthalate adsorption value, using a rotating disk electrode and voltammetry techniques described previously, combined with X-ray photoelectron spectroscopy measurements. Optimal activity was fou...

The synthesis of two aniline oligomers has been performed in order to gain a better knowledge of polyaniline electronic structure. The phenyl-capped-dianiline, tetraaniline and their oxidized forms have been synthesized. A specific chemical treatment has lead to the formation of charged defects polaron and bipolaron characterized by infra-red (IR)...

Polyanilines, treated in pH decreasing solutions, were studied by x-ray photoelectron spectroscopy (XPS). The N1s level XPS spectrum simulation allowed us to check the structure, to estimate the doping rate and to study the localization of charged defects during the doping process. Three kinds of defects were considered : localized on imine nitroge...

FeNPc(1.2) impregnations were investigated at various loadings using a rotating-disk electrode, voltammetry and X-ray photoelectron spectroscopy (XPS) techniques. Optimal activity takes place at monolayer coverage, and major demetallation occurs after prolonged exposure to acid solution. The substitution of Fe by Co enables the electrochemical perf...