432 results on '"Verboom, P."'
Search Results
402. ChemInform Abstract: Synthetic Receptors: A Modular Approach to Large Structures
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HIGLER, I., VERBOOM, W., and REINHOUDT, D. N.
- Abstract
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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- 1997
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- View/download PDF
403. ChemInform Abstract: Spherands, Hemispherands and Calixspherands
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VERBOOM, W. and REINHOUDT, D. N.
- Abstract
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
- Published
- 1997
- Full Text
- View/download PDF
404. ChemInform Abstract: 2‐(1‐Alkenyl)‐ and 2‐Aryl‐Substituted Four‐Membered Cyclic Nitrones as Precursors for 2,3,4‐Substituted Pyridines and Quinolines.
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VERBOOM, W., VAN EIJK, P. J. S. S., CONTI, P. G. M., and REINHOUDT, D. N.
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- 1989
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405. ChemInform Abstract: Metallomacrocycles: Synthesis, X‐Ray Structure, Electrochemistry, and ESR Spectroscopy of Mononuclear and Heterodinuclear Complexes.
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VAN VEGGEL, F. C. J. M., HARKEMA, S., BOS, M., VERBOOM, W., VAN STAVEREN, C. J., GERRITSMA, G. J., and REINHOUDT, D. N.
- Abstract
The Ba2+‐templated (1:1) macrocyclization of dialdehydes such as (I) and (II) with 1,2‐diamino‐2‐methylpropane and o‐phenylenediamine offers a convenient route to heterodiligating ligands with two very different cavities.
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- 1989
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406. ChemInform Abstract: Synthesis of 3‐Substituted Indoles via a Modified Madelung Reaction.
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ORLEMANS, E. O. M., SCHREUDER, A. H., CONTI, P. G. M., VERBOOM, W., and REINHOUDT, D. N.
- Abstract
The N‐protected or deprotected title compounds (VIII) or (X) and (XV) are prepared starting from the anilines (I) and (XIII) via reaction with Ac2O (VI) and Ph‐CO‐Cl (XIV) and subsequent cyclization.
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- 1988
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407. ChemInform Abstract: The Tertiary Amino Effect in Heterocyclic Synthesis: Mechanistic and Computational Study of the Formation of Six‐Membered Rings.
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GROENEN, L. C., VERBOOM, W., NIJHUIS, W. H. N., REINHOUDT, D. N., VAN HUMMEL, G. J., and FEIL, D.
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- 1988
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408. ChemInform Abstract: Reactivity of Four‐Membered Cyclic Nitrones in 1,3‐Cycloaddition Reactions. X‐Ray Crystal Structure of 7‐(2,6‐Dichlorophenyl)‐N,N‐diethyloctahydro‐6‐methyl‐1,3‐dioxo‐2‐phenylazeto(1,2‐b)pyrrolo(3,4‐d) isoxazole‐6‐carboxamide.
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VAN EIJK, P. J. S. S., VERBOOM, W., VAN VEGGEL, F. C. J. M., REINHOUDT, D. N., and HARKEMA, S.
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- 1988
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409. ChemInform Abstract: Self‐Reproduction of Chirality in C‐C Bond Formation via Dipolar Intermediates Generated in situ by (1,5) Hydrogen Transfer.
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NIJHUIS, W. H. N., VERBOOM, W., REINHOUDT, D. N., and HARKEMA, S.
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Heating of (Ia) in refluxing BuOH yields regioselectively the hexahydropyrroloquinoline (IIa).
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- 1987
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410. Towards a Sanskrit Wordparser
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VERBOOM, A.
- Abstract
When studying languages with the help of computers there are two levels to be distinguished, the sentence and the word level Since Sanskrit has a highly detailed morphological system a wordparser, (working on word level), will yield a lot of information The fact that in Sanskrit there is the Sandhi-phenomenon asks for a Sandhi-preprocessor The programming-language BOBRA has extensive pat-tern-recognition-facilities and a very compact notation, which makes it quite fit for the implementation of the formalisms of the Sanskrit wordparser and the Sandhi-preprocessor Several modules of the wordparser have been completed, some of these, the Sandhi-program and BOBRA will be dealt with in some detail in this article Conclusion the developement of the prototype of a Sanskrit wordparser and of the necessary preprocessors as the San-dhi-program is well on its way, the intermediate results being quite satisfactory The formalisms are easily and satisfactorily implemented with the programming-language BOBRA
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- 1988
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411. ChemInform Abstract: α‐Amino Ketones Derived from L‐Proline, as Precursors for Isomitosanes and Mitosenes.
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ORLEMANS, E. O. M., VERBOOM, W., LAMMERINK, B. H. M., and REINHOUDT, D. N.
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- 1989
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412. Influence of plasticizer on the selectivity of nitrate-sensitive CHEMFETs
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Stauthamer, W. P. R. V., Engbersen, J. F. J., Verboom, W., and Reinhoudt, D. N.
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- 1994
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413. Effects of anionic sites on the selectivity of sodium-sensitive CHEMFETs
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Brunink, J. A. J., Bomer, J. G., Engbersen, J. F. J., and Verboom, W.
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- 1993
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414. ChemInform Abstract: A Novel Two‐Step Synthesis of Hexahydropyrazino(1,2‐a)quinolines.
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NIJHUIS, W. H. N., VERBOOM, W., and REINHOUDT, D. N.
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Reaction of 2‐fluorobenzaldehyde (I) with the piperazines (II) yields the substitution products (III) which are coupled with malononitrile (IV) to give the benzylidene derivatives (V).
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- 1987
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415. ChemInform Abstract: Novel Approach to 1H‐Benzo(f)pyrrolo(1,2‐a)indole‐5,10‐diones.
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ORLEMANS, E. O. M., VERBOOM, W., and REINHOUDT, D. N.
- Abstract
Reaction of the dimethoxynaphthalene (I) with the chiral acid chloride (S)‐(II) leads to the formation of the racemic Friedel‐Crafts product (III).
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- 1987
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416. ChemInform Abstract: Combination of Calix(4)arenes and Resorcin(4)arenes for the Complexation of Steroids.
- Author
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HIGLER, I., TIMMERMAN, P., VERBOOM, W., and REINHOUDT, D. N.
- Abstract
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
- Published
- 1997
- Full Text
- View/download PDF
417. In Vitro Susceptibility of Helicobacter pylorito Several Antimicrobial Combinations
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Pavičić, M. J. A. M. P., Namavar, F., Verboom, T., van Winkelhoff, A. J., and de Graaff, J.
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- 1993
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418. Quality of life and clinical outcome in psoriasis patients using intermittent cyclosporin.
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Touw, C.R., Hakkaart-Van Roijen, L., Verboom, P., Paul, C., Rutten, F.F.H., and Finlay, A.Y.
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PSORIASIS , *QUALITY of life , *ITCHING , *CYCLOSPORINE , *DISEASE relapse , *HEALTH , *PHYSIOLOGY - Abstract
Summary Background Psoriasis causes considerable patient morbidity and can seriously affect a patient's quality of life (QoL). Objectives To investigate the relationships between changes in QoL and measures of severity and extent of disease, and itch, in patients with chronic plaque psoriasis receiving intermittent short courses of cyclosporin (Neoral(R)). Methods This study was performed as part of an international trial investigating the safety, efficacy and total costs of intermittent short courses of cyclosporin (the PISCES study). All patients received cyclosporin until clearance and were then followed up until relapse. On relapsing, patients received another course. Patients were followed up for a minimum of I year during which they could receive as many courses of treatment as necessary. In a subgroup (n = 255) of patients in the trial, the Dermatology Life Quality Index (DLOI) was used to assess the impact of psoriasis and its treatment on the patients' health status at the beginning and end of each treatment period. At the beginning and end of each treatment period, as well as at 2-weekly visits, the extent and severity of disease, together calculated into a modified Psoriasis Area and Severity index (PASI), and itch were recorded. Data were analysed using the Wilcoxon matched pairs test, multivariate Hotelling's T[sup 2] tests, and Spearman's rank correlation coefficients (r[sub s]). Results During treatment, a clear... [ABSTRACT FROM AUTHOR]
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- 2001
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419. Projected health-care resource needs for an effective response to COVID-19 in 73 low-income and middle-income countries: a modelling study.
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Tan-Torres Edejer T, Hanssen O, Mirelman A, Verboom P, Lolong G, Watson OJ, Boulanger LL, and Soucat A
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- COVID-19, Coronavirus Infections economics, Coronavirus Infections epidemiology, Forecasting, Humans, Models, Theoretical, Pandemics economics, Pneumonia, Viral economics, Pneumonia, Viral epidemiology, Coronavirus Infections prevention & control, Developing Countries, Health Care Costs, Health Services Needs and Demand economics, Pandemics prevention & control, Pneumonia, Viral prevention & control
- Abstract
Background: Since WHO declared the COVID-19 pandemic a Public Health Emergency of International Concern, more than 20 million cases have been reported, as of Aug 24, 2020. This study aimed to identify what the additional health-care costs of a strategic preparedness and response plan (SPRP) would be if current transmission levels are maintained in a status quo scenario, or under scenarios where transmission is increased or decreased by 50%., Methods: The number of COVID-19 cases was projected for 73 low-income and middle-income countries for each of the three scenarios for both 4-week and 12-week timeframes, starting from June 26, 2020. An input-based approach was used to estimate the additional health-care costs associated with human resources, commodities, and capital inputs that would be accrued in implementing the SPRP., Findings: The total cost estimate for the COVID-19 response in the status quo scenario was US$52·45 billion over 4 weeks, at $8·60 per capita. For the decreased or increased transmission scenarios, the totals were $33·08 billion and $61·92 billion, respectively. Costs would triple under the status quo and increased transmission scenarios at 12 weeks. The costs of the decreased transmission scenario over 12 weeks was equivalent to the cost of the status quo scenario at 4 weeks. By percentage of the overall cost, case management (54%), maintaining essential services (21%), rapid response and case investigation (14%), and infection prevention and control (9%) were the main cost drivers., Interpretation: The sizeable costs of a COVID-19 response in the health sector will escalate, particularly if transmission increases. Instituting early and comprehensive measures to limit the further spread of the virus will conserve resources and sustain the response., Funding: WHO, and UK Foreign Commonwealth and Development Office., (© 2020 This is an Open Access article published under the CC BY-NC-ND 3.0 IGO license which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In any use of this article, there should be no suggestion that WHO endorses any specific organisation, products or services. The use of the WHO logo is not permitted. This notice should be preserved along with the article's original URL.)
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- 2020
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420. Developing a multisectoral National Action Plan for Health Security (NAPHS) to implement the International Health Regulations (IHR 2005) in Tanzania.
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Mghamba JM, Talisuna AO, Suryantoro L, Saguti GE, Muita M, Bakari M, Rusibamayila N, Ally M, Bernard J, Banda R, Mapunda M, Eidex R, Sreedharan R, Sliter K, Nikkari S, Saikat S, Lolong GPM, Verboom P, Yahaya AA, Chungong S, Rodier G, and Fall IS
- Abstract
The Ebola outbreak in West Africa precipitated a renewed momentum to ensure global health security through the expedited and full implementation of the International Health Regulations (IHR) (2005) in all WHO member states. The updated IHR (2005) Monitoring and Evaluation Framework was shared with Member States in 2015 with one mandatory component, that is, States Parties annual reporting to the World Health Assembly (WHA) on compliance and three voluntary components: Joint External Evaluation (JEE), After Action Reviews and Simulation Exercises. In February 2016, Tanzania, was the first country globally to volunteer to do a JEE and the first to use the recommendations for priority actions from the JEE to develop a National Action Plan for Health Security (NAPHS) by February 2017. The JEE demonstrated that within the majority of the 47 indicators within the 19 technical areas, Tanzania had either 'limited capacity' or 'developed capacity'. None had 'sustainable capacity'. With JEE recommendations for priority actions, recommendations from other relevant assessments and complementary objectives, Tanzania developed the NAPHS through a nationwide consultative and participatory process. The 5-year cost estimate came out to approximately US$86.6 million (22 million for prevent, 50 million for detect, 4.8 million for respond and 9.2 million for other IHR hazards and points of entry). However, with the inclusion of vaccines for zoonotic diseases in animals increases the cost sevenfold. The importance of strong country ownership and committed leadership were identified as instrumental for the development of operationally focused NAPHS that are aligned with broader national plans across multiple sectors. Key lessons learnt by Tanzania can help guide and encourage other countries to translate their JEE priority actions into a realistic costed NAPHS for funding and implementation for IHR (2005)., Competing Interests: Competing interests: None declared.
- Published
- 2018
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421. Financing transformative health systems towards achievement of the health Sustainable Development Goals: a model for projected resource needs in 67 low-income and middle-income countries.
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Stenberg K, Hanssen O, Edejer TT, Bertram M, Brindley C, Meshreky A, Rosen JE, Stover J, Verboom P, Sanders R, and Soucat A
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- Conservation of Natural Resources, Costs and Cost Analysis, Goals, Health Resources, Health Services Needs and Demand, Humans, Models, Theoretical, Universal Health Insurance, Delivery of Health Care economics, Delivery of Health Care organization & administration, Developing Countries
- Abstract
Background: The ambitious development agenda of the Sustainable Development Goals (SDGs) requires substantial investments across several sectors, including for SDG 3 (healthy lives and wellbeing). No estimates of the additional resources needed to strengthen comprehensive health service delivery towards the attainment of SDG 3 and universal health coverage in low-income and middle-income countries have been published., Methods: We developed a framework for health systems strengthening, within which population-level and individual-level health service coverage is gradually scaled up over time. We developed projections for 67 low-income and middle-income countries from 2016 to 2030, representing 95% of the total population in low-income and middle-income countries. We considered four service delivery platforms, and modelled two scenarios with differing levels of ambition: a progress scenario, in which countries' advancement towards global targets is constrained by their health system's assumed absorptive capacity, and an ambitious scenario, in which most countries attain the global targets. We estimated the associated costs and health effects, including reduced prevalence of illness, lives saved, and increases in life expectancy. We projected available funding by country and year, taking into account economic growth and anticipated allocation towards the health sector, to allow for an analysis of affordability and financial sustainability., Findings: We estimate that an additional $274 billion spending on health is needed per year by 2030 to make progress towards the SDG 3 targets (progress scenario), whereas US$371 billion would be needed to reach health system targets in the ambitious scenario-the equivalent of an additional $41 (range 15-102) or $58 (22-167) per person, respectively, by the final years of scale-up. In the ambitious scenario, total health-care spending would increase to a population-weighted mean of $271 per person (range 74-984) across country contexts, and the share of gross domestic product spent on health would increase to a mean of 7·5% (2·1-20·5). Around 75% of costs are for health systems, with health workforce and infrastructure (including medical equipment) as the main cost drivers. Despite projected increases in health spending, a financing gap of $20-54 billion per year is projected. Should funds be made available and used as planned, the ambitious scenario would save 97 million lives and significantly increase life expectancy by 3·1-8·4 years, depending on the country profile., Interpretation: All countries will need to strengthen investments in health systems to expand service provision in order to reach SDG 3 health targets, but even the poorest can reach some level of universality. In view of anticipated resource constraints, each country will need to prioritise equitably, plan strategically, and cost realistically its own path towards SDG 3 and universal health coverage., Funding: WHO., (Copyright © 2017 World Health Organization; licensee Elsevier. This is an Open Access article published under the CC BY 3.0 IGO license which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In any use of this article, there should be no suggestion that WHO endorses any specific organisation, products or services. The use of the WHO logo is not permitted. This notice should be preserved along with the article's original URL.)
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- 2017
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422. The cost utility of solifenacin in the treatment of overactive bladder.
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Hakkaart L, Verboom P, Phillips R, and Al MJ
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- Adult, Cost-Benefit Analysis, Diapers, Adult, Female, Humans, Male, Markov Chains, Muscarinic Antagonists therapeutic use, Patient Compliance, Quality-Adjusted Life Years, Quinuclidines therapeutic use, Solifenacin Succinate, Tetrahydroisoquinolines therapeutic use, Treatment Outcome, Urinary Bladder, Overactive economics, Drug Costs, Muscarinic Antagonists economics, Quinuclidines economics, Tetrahydroisoquinolines economics, Urinary Bladder, Overactive drug therapy
- Abstract
Objectives: Overactive bladder may cause significant discomfort to patients. The standard therapy for overactive bladder includes behavioural therapy and sometimes medication. Recently, a new medication (solifenacin 5 and 10 mg) was developed for treatment of overactive bladder. The objective of this study was to assess the cost utility of solifenacin 5 and 10 mg for overactive bladder., Methods: We developed a Markov model to estimate the cost per quality adjusted life years (QALY) over a period of 12-months. Model parameters were based on randomized clinical trials for solifenacin 5 and 10 mg. Data on utility scores were taken from the literature., Results: The incremental cost per QALY for solifenacin 5 mg and solifenacin 10 mg compared with placebo were 17,602 pounds and 24,464 pounds respectively. Sensitivity analyses showed that these results were robust to changes of relevant input data., Conclusion: Solifenacin 5 and 10 mg are cost-effective treatments in patients with overactive bladder.
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- 2009
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423. Rapid identification and antimicrobial susceptibility testing reduce antibiotic use and accelerate pathogen-directed antibiotic use.
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Kerremans JJ, Verboom P, Stijnen T, Hakkaart-van Roijen L, Goessens W, Verbrugh HA, and Vos MC
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- Adult, Aged, Anti-Infective Agents administration & dosage, Drug Resistance, Bacterial physiology, Female, Follow-Up Studies, Humans, Male, Middle Aged, Prospective Studies, Time Factors, Anti-Bacterial Agents administration & dosage, Drug Resistance, Bacterial drug effects, Microbial Sensitivity Tests methods
- Abstract
Introduction: Rapid bacterial identification and susceptibility tests can lead to earlier microbiological diagnosis and pathogen-directed, appropriate therapy. We studied whether accelerated diagnostics affected antibiotic use and patient outcomes., Patients and Methods: A prospective randomized clinical trial was performed over a 2-year period. Inpatients were selected on the basis of a positive culture from normally sterile body fluids and randomly assigned to either a rapid intervention arm or the control arm. The intervention arm used the Vitek 2 automated identification and susceptibility testing device, combined with direct inoculation of blood cultures. In the control arm, the Vitek 1 system inoculated from subcultures was used. Follow-up was 4 weeks after randomization., Results: A total of 1498 patients were randomized: 746 in the intervention arm and 752 in the control arm. For susceptibility testing, the rapid arm was 22 h faster than the control arm, and for identification, it was 13 h faster (P < 0.0001). In the rapid arm, antibiotic use was 6 defined daily doses lower per patient than in the control arm (P = 0.012). Whereas antibiotics were switched more in the rapid group on the day of randomization (P = 0.006), in the control group they were switched more on day two (P = 0.02). Mortality rates did not differ significantly between the two groups (17.6% versus 15.2%)., Conclusions: While rapid bacterial identification and susceptibility testing led to earlier changes and a significant reduction in antibiotic use, they did not reduce mortality.
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- 2008
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424. Traditional versus up-front [18F] fluorodeoxyglucose-positron emission tomography staging of non-small-cell lung cancer: a Dutch cooperative randomized study.
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Herder GJ, Kramer H, Hoekstra OS, Smit EF, Pruim J, van Tinteren H, Comans EF, Verboom P, Uyl-de Groot CA, Welling A, Paul MA, Boers M, Postmus PE, Teule GJ, and Groen HJ
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- Aged, Carcinoma, Non-Small-Cell Lung therapy, Female, Fluorodeoxyglucose F18, Health Care Costs, Humans, Lung Neoplasms therapy, Male, Middle Aged, Neoadjuvant Therapy, Neoplasm Staging economics, Neoplasm Staging standards, Radionuclide Imaging, Radiopharmaceuticals, Sensitivity and Specificity, Time Factors, Carcinoma, Non-Small-Cell Lung diagnostic imaging, Lung Neoplasms diagnostic imaging, Neoplasm Staging methods
- Abstract
Purpose: We investigated whether application of positron emission tomography (PET) immediately after first presentation might simplify staging while maintaining accuracy, as compared with traditional strategy in routine clinical setting., Methods: At first presentation, patients with a provisional diagnosis of lung cancer without overt dissemination were randomly assigned to traditional work-up (TWU) according to international guidelines or early PET followed by histologic/cytologic verification of lesions, or imaging and follow-up. Patients with [18F] fluorodeoxyglucose (18FDG) -avid, noncentral tumors without suspicion of mediastinal or distant metastases on PET proceeded directly to thoracotomy. Follow-up in presumed benign lesions was at least 12 months. In patients treated with surgery or neoadjuvant therapy, the quality of staging was measured by comparing the clinical stage to the final stage (combination of peroperative staging and 6 months of follow-up). To investigate test substitution, we analyzed the number of (non)invasive tests to achieve clinical TNM staging, and its associated costs., Results: Between 1999 and 2001, 465 patients (233 TWU, 232 PET) were enrolled at 22 hospitals. The mean (standard deviation) number of procedures to finalize staging was equal in the TWU arm and the PET arm: 7.9 (2.0) v 7.9 (1.9), P = .90, respectively. Mediastinoscopies occurred significantly less often in the PET arm. Agreement between clinical and final stage was good in both arms (kappa = .85 v .78; P = .07). Costs did not differ significantly., Conclusion: Up-front 18FDG-PET in patients with (suspected) lung cancer does not reduce the overall number of diagnostic test, but it maintains quality of TNM staging with the use of less invasive surgery.
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- 2006
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425. Immunotherapy with autologous tumor cell-BCG vaccine in patients with colon cancer: a prospective study of medical and economic benefits.
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Uyl-de Groot CA, Vermorken JB, Hanna MG Jr, Verboom P, Groot MT, Bonsel GJ, Meijer CJ, and Pinedo HM
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- Adult, Aged, Aged, 80 and over, Cancer Vaccines economics, Colonic Neoplasms economics, Colonic Neoplasms mortality, Colonic Neoplasms surgery, Combined Modality Therapy, Cost-Benefit Analysis, Disease-Free Survival, Female, Humans, Immunotherapy, Active, Male, Middle Aged, Prognosis, Prospective Studies, Survival Rate, BCG Vaccine therapeutic use, Cancer Vaccines therapeutic use, Colonic Neoplasms therapy
- Abstract
We have completed a multicenter, randomized controlled phase III clinical trial in Stages II and III colon cancer patients with active specific immunotherapy (ASI) using autologous tumor cells with an immunomodulating adjuvant bacillus Callmette-Guerin (BCG) vaccine (OncoVAX) in an adjuvant setting. In this study, patients were randomized to receive either OncoVAX therapy or no therapy after surgical resection of the primary tumor and stratified by stage of disease. Since the biologic essence of the effective tumor immunotherapy is the presence in the vaccine of a minimum number of viable, metabolically active, autologous tumor cells, the processing of the vaccine product, occurred within 48 h after surgery. Analysis of prognostic benefit in the pivotal phase III trial, with a 5.8 year median follow-up, showed that a beneficial effect of OncoVAX is statistically significant for all endpoints including recurrence-free interval, overall survival, and recurrence-free survival in Stage II colon cancer patients. Surgery alone cures approximately 65% of Stage II (Dukes B2, B3) colon cancer patients. In the remaining patients, OncoVAX in an adjuvant setting, significantly prolongs recurrence-free interval (57.1% relative risk reduction) and significantly improves 5-year overall survival and recurrence-free survival. No statistically significant prognostic benefits were achieved in Stage III (Duke's C1-C3) patients. A health economics assessment was performed on these results in Stage II colon cancer patients using disease-free survival and overall survival (for the entire intent-to-treat population). Cost-effectiveness, cost-utility and sensitivity analysis were applied with, cost of life years, recurrence-free life years and quality adjusted life years (QALYs) as the primary endpoints to this analysis. The perspective of the economic analysis was the current direct medical cost established by the health care providers. The introduction of new technologies often leads to additional costs. This report verified that the use of OncoVAX for patients with Stage II colon cancer not only has significant prognostic benefit and positive clinical outcomes, but also showed that OncoVAX therapy yields impressive health economics benefits.
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- 2005
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426. Cost-effectiveness of FDG-PET in staging non-small cell lung cancer: the PLUS study.
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Verboom P, van Tinteren H, Hoekstra OS, Smit EF, van den Bergh JH, Schreurs AJ, Stallaert RA, van Velthoven PC, Comans EF, Diepenhorst FW, van Mourik JC, Postmus PE, Boers M, Grijseels EW, Teule GJ, and Uyl-de Groot CA
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- Aged, Carcinoma, Non-Small-Cell Lung diagnosis, Female, Health Care Costs statistics & numerical data, Humans, Lung Neoplasms diagnosis, Male, Neoplasm Staging economics, Neoplasm Staging methods, Netherlands, Radiopharmaceuticals economics, Reproducibility of Results, Risk Assessment economics, Risk Assessment methods, Sensitivity and Specificity, Tomography, Emission-Computed methods, Carcinoma, Non-Small-Cell Lung diagnostic imaging, Carcinoma, Non-Small-Cell Lung economics, Cost-Benefit Analysis methods, Fluorodeoxyglucose F18 economics, Lung Neoplasms diagnostic imaging, Lung Neoplasms economics, Tomography, Emission-Computed economics
- Abstract
Currently, up to 50% of the operations in early-stage non-small cell lung cancer (NSCLC) are futile owing to the presence of locally advanced tumour or distant metastases. More accurate pre-operative staging is required in order to reduce the number of futile operations. The cost-effectiveness of fluorine-18 fluorodeoxyglucose positron emission tomography ((18)FDG-PET) added to the conventional diagnostic work-up was studied in the PLUS study. Prior to invasive staging and/or thoracotomy, 188 patients with (suspected) NSCLC were randomly assigned to conventional work-up (CWU) and whole-body PET or to CWU alone. CWU was based on prevailing guidelines. Pre-operative staging was followed by 1 year of follow-up. Outcomes are expressed in the percentage of correctly staged patients and the associated costs. The cost price of PET varied between
736 and 1,588 depending on the (hospital) setting and the procurement of (18)FDG commercially or from on-site production. In the CWU group, 41% of the patients underwent a futile thoracotomy, whereas in the PET group 21% of the thoracotomies were considered futile ( P=0.003). The average costs per patient in the CWU group were 9,573 and in the PET group, 8,284. The major cost driver was the number of hospital days related to recovery from surgery. Sensitivity analysis on the cost and accuracy of PET showed that the results were robust, i.e. in favour of the PET group. The addition of PET to CWU prevented futile surgery in one out of five patients with suspected NSCLC. Despite the additional PET costs, the total costs were lower in the PET group, mainly due to a reduction in the number of futile operations. The additional use of PET in the staging of patients with NSCLC is feasible, safe and cost saving from a clinical and from an economic perspective. - Published
- 2003
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427. The cost effectiveness of Apligraf treatment of diabetic foot ulcers.
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Redekop WK, McDonnell J, Verboom P, Lovas K, and Kalo Z
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- Ambulatory Care, Amputation, Surgical, Bacterial Infections prevention & control, Cost-Benefit Analysis, Diabetic Foot microbiology, Diabetic Foot surgery, Humans, Markov Chains, Quality of Life, Reproducibility of Results, Sensitivity and Specificity, Time Factors, Wound Healing, Collagen economics, Collagen therapeutic use, Diabetic Foot therapy, Skin, Artificial economics
- Abstract
Background: Diabetic foot ulcers (DFUs) present a treatment challenge and result in a large economic burden, requiring careful evaluation of the clinical efficacy and cost effectiveness of new treatment modalities. DFU clinical trials of the bio-engineered skin substitute Apligraf (Novartis Pharma AG, Basel, Switzerland) have demonstrated improved clinical efficacy compared with good wound care (GWC) alone., Objective: To determine the economic impact and cost effectiveness of Apligraf plus GWC compared with GWC alone in the treatment of DFUs., Study Perspective: Societal., Methods: A Markov-based simulation model was created to compare the costs and effects of Apligraf plus GWC to those of GWC alone over a 12-month period. The primary health states were 'uninfected ulcer', 'infected ulcer', 'gangrene', and 'healed ulcer'. Transition probabilities were based on clinical trial results, while cost estimates were based on estimates of resource utilisation in the Netherlands. The cost-effectiveness outcome measures were the incremental cost per ulcer-free month gained and the incremental cost per amputation avoided., Results: Costs in the first year of treatment were Euro 4656 for Apligraf plus GWC and Euro 5310 for GWC alone (1999 values). Treatment with Apligraf led to lower costs since its greater effectiveness offset the added cost of the product. This benefit was realised after 5 months, the crossover point of the two cost curves. Apligraf use increased the amount of ulcer-free time by by 1.53 months (7.78 vs 6.25) and reduced the risk of amputation (6.3% vs 17.1%). Sensitivity analyses showed that cost parameters (e.g. units of Apligraf required, cost of treatment practice) and transition probabilities between health states affected the cost results., Conclusions: Treatment with Apligraf plus GWC resulted in a 12% reduction in costs over the first year of treatment compared with GWC alone. The increased ulcer-free time coupled with a reduced risk of amputation to a large extent offset the initial costs of the product.
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- 2003
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428. The cost of atopic dermatitis in the Netherlands: an international comparison.
- Author
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Verboom P, Hakkaart-Van L, Sturkenboom M, De Zeeuw R, Menke H, and Rutten F
- Subjects
- Adolescent, Adult, Age Factors, Child, Child, Preschool, Dermatitis, Atopic drug therapy, Dermatitis, Atopic epidemiology, Dermatologic Agents economics, Dermatologic Agents therapeutic use, Drug Costs, Family Practice economics, Female, Humans, Incidence, Infant, Infant, Newborn, Male, Netherlands epidemiology, Prevalence, Retrospective Studies, Seasons, Cost of Illness, Dermatitis, Atopic economics, Health Care Costs
- Abstract
Background: Only a few international studies have assessed the economic burden of atopic dermatitis (AD), and no costs-of-illness study for AD has been done for the Netherlands., Objectives: To estimate the incidence, prevalence and health-care costs of AD in the Netherlands and to put these in an international perspective., Methods: We conducted a retrospective cohort study by using the data of an information system of general practitioners (GPs). To calculate the health-care costs at the primary care level we assessed medical resources utilization. We assessed the costs of patients with more severe AD from a retrospective study of patient files at the department of dermatology of a general hospital. We compared our results with costs-of-illness studies for other countries., Results: The overall general population incidence and prevalence of AD were 0.8% and 2.3%, respectively. The incidence and prevalence were high among children until the age of 6 years, respectively, 3.1% and 11.3%, but decreased rapidly thereafter. The total mean health-care costs per patient were USD71. The most significant costs were due to visits to the GP (USD32) and medication, mostly corticosteroids (USD21). Young children were treated more often with emollients alone. Only 7.8% of patients were referred to a specialist. The mean costs for these patients were USD186. Costs-of-illness studies for Australia, Germany, the U.K., the U.S.A. and the Netherlands suggested that the costs associated with AD vary considerably across countries. Estimates of the costs-of-illness for AD ranged from USD71 in the Netherlands to USD2559 in Germany per patient due to variation in the study population (GP vs. hospital) and the number of cost components included. Studies that included costs due to the time spent on treatment had relatively high estimates., Conclusions: The prevalence and incidence of AD are high among young children. In general, the health-care costs for AD were low. Patients' out-of-pocket costs were relatively high.
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- 2002
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429. Staging of non-small-cell lung cancer and application of FDG-PET. A cost modeling approach.
- Author
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Verboom P, Herder GJ, Hoekstra OS, Smit EF, van den Bergh JH, van Velthoven PC, and Grijseels EW
- Subjects
- Aged, Carcinoma, Non-Small-Cell Lung surgery, Cost-Benefit Analysis, Female, Fluorodeoxyglucose F18, Humans, Lung Neoplasms surgery, Male, Middle Aged, Netherlands, Prognosis, Radiopharmaceuticals, Retrospective Studies, Carcinoma, Non-Small-Cell Lung diagnostic imaging, Hospital Costs statistics & numerical data, Lung Neoplasms diagnostic imaging, Models, Econometric, Neoplasm Staging economics, Preoperative Care economics, Tomography, Emission-Computed economics
- Abstract
Background: The presence of (distant) metastases affects the therapy (operation) and prognosis of patients with non-small-cell lung cancer (NSCLC). Fifty percent of the operations are futile due to the presence of a locally advanced tumor or distant metastases. Therefore, more accurate preoperative staging is required with respect to the outcomes (reduction of futile operations) and costs. This study examines current staging procedures and assesses possible situations for incorporating positron emission tomography (PET)., Methods: A retrospective analysis was performed to assess actual clinical practice in the staging procedure of 337 patients with NSCLC in two Dutch hospitals. Consequently, by combining these data of actual clinical practice with a literature review, a model was developed to determine the influence of PET on the staging outcomes and the costs. In this model the accuracy and costs of PET can be varied as well as the extent of substitution of conventional diagnostic tests by PET., Results: Practice variation was found between the two hospitals with regard to the setting in which the diagnostic staging took place (hospitalization, outpatient setting) and the extent of the use of mediastinoscopy. This was reflected in the costs and in the number of (futile) operations., Conclusion: Hospitalization is the major cost driver in these patients. From a cost viewpoint, the evaluation of PET in a strategy after diagnostic imaging but prior to invasive staging seems most optimal.
- Published
- 2002
430. Practice, efficacy and cost of staging suspected non-small cell lung cancer: a retrospective study in two Dutch hospitals.
- Author
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Herder GJ, Verboom P, Smit EF, van Velthoven PC, van den Bergh JH, Colder CD, van Mansom I, van Mourik JC, Postmus PE, Teule GJ, and Hoekstra OS
- Subjects
- Adult, Aged, Aged, 80 and over, Carcinoma, Non-Small-Cell Lung pathology, Carcinoma, Non-Small-Cell Lung surgery, Female, Fluorodeoxyglucose F18 economics, Follow-Up Studies, Hospital Costs, Hospitals, Community economics, Humans, Lung Neoplasms pathology, Lung Neoplasms surgery, Male, Medical Futility, Middle Aged, Neoplasm Recurrence, Local economics, Neoplasm Staging methods, Neoplasm Staging standards, Netherlands, Postoperative Care economics, Prospective Studies, Radiopharmaceuticals economics, Retrospective Studies, Tomography, Emission-Computed economics, Tomography, Emission-Computed methods, Treatment Outcome, Carcinoma, Non-Small-Cell Lung economics, Lung Neoplasms economics, Neoplasm Staging economics
- Abstract
Background: A study was undertaken to investigate the clinical practice, yield, and costs of preoperative staging in patients with suspected NSCLC and to obtain baseline data for prospective studies on the cost effectiveness of (18)F-fluorodeoxyglucose positron emission tomography in the management of these patients., Methods: A retrospective study of the medical records of all patients with suspected NSCLC was performed during a 2 year interval (1993-4) in an academic and a large community hospital., Results: Three hundred and ninety five patients with suspected NSCLC were identified; 58 were deemed to be medically inoperable and 337 patients proceeded to the staging process. Staging required a mean (SD) of 5.1 (1.5) diagnostic tests per patient (excluding thoracotomy) carried out over a median period of 20 days (IQR 10-31). Many of the tests (including both invasive and non-invasive) were done because previous imaging tests had suggested metastases, and in most cases the results of initial tests proved to be false positives. After clinical staging, 168 patients were considered to be resectable (stage I/II) and 144 patients underwent surgery with curative intent. At surgery 33 patients (23% of those who underwent surgery) were found to have irresectable lesions and 19 (13%) had a benign lesion. Surgery was also considered to be futile in 22 patients (15%) who developed metastases or local recurrence within 12 months following radical surgery. Hospital admission was responsible for most of the costs., Conclusion: In many patients staging involved considerable effort in terms of the number of diagnostic tests, the duration of the staging period and the cost, with limited success in preventing futile surgery. Failures relate to the quality of diagnostic preparation at every level of the TNM staging system.
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- 2002
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431. Toward less futile surgery in non-small cell lung cancer? A randomized clinical trial to evaluate the cost-effectiveness of positron emission tomography.
- Author
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van Tinteren H, Hoekstra OS, Smit EF, Verboom P, and Boers M
- Subjects
- Aged, Carcinoma, Non-Small-Cell Lung diagnostic imaging, Carcinoma, Non-Small-Cell Lung mortality, Cost-Benefit Analysis, Female, Follow-Up Studies, Humans, Lung Neoplasms diagnostic imaging, Lung Neoplasms mortality, Male, Middle Aged, Survival Rate, Carcinoma, Non-Small-Cell Lung surgery, Lung Neoplasms surgery, Medical Futility, Tomography, Emission-Computed economics
- Abstract
Non-small cell lung cancer can be cured if the patient is medically operable and the tumor resectable. Current diagnostic strategies are aimed to detect tumor deposits that preclude resection with curative intent. However, these strategies are rather inefficient, resulting in a large number of futile invasive procedures. In the early 1990s positron emission tomography (PET) showed promising results at its introduction in the clinic, especially in oncology. A large number of accuracy studies have reported that PET is superior to conventional imaging. However, whether PET ultimately improves patient outcome should ideally be assessed by means of a randomized controlled trial. No such design has been applied to evaluate PET in oncology so far. The PLUS study was designed to compare the current strategy of conventional methods with a strategy where PET was added after completion of noninvasive techniques. Patients considered operable by the physician at this point were then randomly assigned to PET and further consequences or to standard procedures of mediastinoscopy or thoracotomy. Primary outcome events were futile thoracotomies. The trial randomized 188 patients from nine hospitals in 1 year. Patient enrollment has been stopped and data collection is in progress. The results will be published in 2001. Control Clin Trials 2001;22:89-98
- Published
- 2001
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432. The cost effectiveness of tapered versus abrupt discontinuation of oral cyclosporin microemulsion for the treatment of psoriasis.
- Author
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Hakkaart-van Roijen L, Verboom P, Redekop WK, Touw KR, and Rutten FF
- Subjects
- Administration, Oral, Adult, Chronic Disease, Cyclosporine administration & dosage, Cyclosporine therapeutic use, Dermatologic Agents administration & dosage, Dermatologic Agents therapeutic use, Direct Service Costs, Drug Administration Schedule, Economics, Pharmaceutical, Female, Humans, Male, Multicenter Studies as Topic, Psoriasis drug therapy, Treatment Outcome, Cost-Benefit Analysis, Cyclosporine economics, Dermatologic Agents economics, Psoriasis economics
- Abstract
Objective: To assess the cost effectiveness of tapered versus abrupt discontinuation of a microemulsion formulation of cyclosporin in patients with chronic plaque psoriasis., Methods: A cost-effectiveness analysis was performed in parallel with a non-blind, multicentre, international clinical trial of the safety and efficacy of intermittent short courses of cyclosporin. Direct and indirect costs were considered within a 1-year period following randomisation., Patients: Patients with chronic plaque psoriasis inadequately controlled with topical treatment., Study Perspective: The study was conducted from a societal perspective and was performed using data from Canada, Spain, Turkey and the UK., Main Outcomes Measures: The health outcome used was the total number of systemic therapy-free days (STFDs) over the first year. The mean incremental cost-effectiveness ratio (ICER) was determined by dividing the differences in average cost per patient by the differences in average STFDs per patient., Results: The overall ICER was dominant because tapered discontinuation was associated with both lower costs and improved efficacy in comparison with abrupt discontinuation. Further analyses showed that tapered discontinuation was a cost-effective alternative to abrupt discontinuation therapy, even when a conservative definition for cost effectiveness was adopted., Conclusion: This cost-effectiveness analysis demonstrated that tapering cyclosporin was more cost effective than abruptly stopping cyclosporin in patients with chronic plaque psoriasis.
- Published
- 2001
- Full Text
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