Publications by authors named "Pieter Leffers"

Irregular 24 h light/dark cycles with night-time light exposure and a low amplitude are disruptive for sleep, mood and circadian rhythms. Nevertheless such lighting conditions are quite common in medical care facilities. A controlled clinical trial among 196 cardiology ward patients (mean age 66.

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Objective: This study reports on the effects of botulinum toxin A (BoNT-A) injections in the upper extremity (UE) of children with unilateral Cerebral Palsy (uCP) combined with bimanual task oriented therapy (BITT) or either treatment modality performed separately on UE range of motion (ROM), spasticity and (functional) strength.

Methods: Thirty-five children, mean age 7.14 years (SD 2.

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Objectives: In quality of care research, the balanced incomplete block (BIB) design is regularly claimed to have been used when evaluating complex interventions. In this article, we reflect on the appropriateness of using this design for evaluating complex interventions.

Study Design And Setting: Literature study using PubMed and handbooks.

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Background: The Observational Skills Assessment Score (OSAS) measures amount and quality of use of the affected hand in children with unilateral Cerebral Palsy (CP) in bimanual activities and could therefore be a valuable addition to existing assessment tools. The OSAS consists of tasks that are age appropriate and require use of the affected hand.

Methods: To measure the agreement and reliability of the OSAS a convenience sample of two groups of 16 children with unilateral spastic CP (2.

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Studies of determinants of recurrent disease often give unexpected results. In particular, well-established risk factors may seem not to have much influence on the recurrence risk. Recently, it has been argued that such paradoxical findings may be because of the bias caused by the selection of patients based on the occurrence of an earlier episode of the disease.

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For assessment of bone remodelling around total hip arthroplasty using dual-emission X-ray absorptiometry (DEXA), a variety of different systems to identify regions of interest (ROI) have been used, making comparisons between stem designs difficult. The Gruen zones are now widely used for this purpose. We present the results of a randomised clinical trial comparing 2 uncemented stem designs with proximal coating, using a modification of the Gruen zones to allow improved representation of the effect of the implant on bone mineral density (BMD) over time.

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Background And Aim: Glasgow Blatchford Bleeding Score stratifies patients presenting with acute upper gastrointestinal haemorrhage at the emergency department according to the likelihood of the need for treatment. The objective of this study was to validate the Glasgow Blatchford Bleeding Score for use in an emergency department in the Netherlands. Furthermore, we assessed its clinical usefulness for safe discharge of low-risk acute upper gastrointestinal haemorrhage patients and compared its test validity to that of other scoring systems.

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Unlabelled: With antiangiogenic agents, tumor shrinkage may be absent, despite survival benefit. The present study assessed the predictive value of molecular imaging for the identification of survival benefit during antiangiogenic treatment with bevacizumab and erlotinib in patients with advanced non-small cell lung cancer.

Methods: Patients were evaluated using an imaging protocol including CT, 18F-FDG PET, H2(15)O PET, and dynamic contrast-enhanced MRI to derive measurements on tumor size, glucose metabolism, perfusion, and microvascular permeability.

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Introduction: Predictive models, such as acute physiology and chronic health evaluation II (APACHE-II), are widely used in intensive care units (ICUs) to estimate mortality. Although the presence of delirium is associated with a higher mortality in ICU patients, delirium is not part of the APACHE-II model. The aim of the current study was to evaluate whether delirium, present within 24 hours after ICU admission, improves the predictive value of the APACHE-II score.

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Purpose: There is a need to evaluate patients with peripheral arterial disease (PAD) with a limited or extended walking distance. We aimed to enable an estimation of walking distance as measured on a frequently used "standard" graded (3.2 km·h(-1), 2% increase per 2 min) protocol for walking distances measured on protocols with a lower or higher workload.

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Background: Various structural and functional factors of foot function have been associated with high local plantar pressures. The therapist focuses on these features which are thought to be responsible for plantar ulceration in patients with diabetes. Risk assessment of the diabetic foot would be made easier if locally elevated plantar pressure could be indicated with a minimum set of clinical measures.

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Background: Pregnancy-related low back pain is considered an important health problem and potentially leads to long-lasting pain and disability. Investigators draw particular attention to biomedical factors but there is growing evidence that psychosocial and social factors might be important. It prompted us to start a large cohort study (n = 7526) during pregnancy until one year after delivery and a nested randomized controlled intervention study in the Netherlands.

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Background: The aims of this study were to show 1) the effect of changing from computed tomography (CT) to magnetic resonance imaging (MRI) on the prevalence of detected brain metastases (BM) in patients with newly diagnosed small cell lung cancer (SCLC); 2) the difference in survival between patients with single and multiple BM; and 3) the effect of the change in patient labeling on eligibility for prophylactic brain irradiation.

Methods: From 1980 to 2004, 481 consecutive patients with SCLC were enrolled. Brain imaging was routinely performed after diagnosis of SCLC.

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Objective: To assess differences regarding in-shoe forefoot plantar pressure (PP) in patients with diabetes during various daily-life activities.

Research Design And Methods: In-shoe PP was measured in 93 patients during: level walking, ramp and stair walking, turning in different settings and while performing the Up & Go test. Separate PPs were determined for the big toe and metatarsal (mt) regions one to five.

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Background: Identification of locations with elevated plantar pressures is important in daily foot care for patients with rheumatoid arthritis, metatarsalgia and diabetes. The purpose of the present study was to evaluate the proficiency of podiatrists, pedorthists and orthotists, to distinguish locations with elevated plantar pressure in patients with metatarsalgia.

Methods: Ten podiatrists, ten pedorthists and ten orthotists working in The Netherlands were asked to identify locations with excessively high plantar pressure in three patients with forefoot complaints.

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Purpose: The purpose of this study was to investigate the radiologic response of asymptomatic brain metastases (BM) from small-cell lung cancer (SCLC) to first-line systemic chemotherapy.

Patients And Methods: From 1990 to 2003, 181 consecutive patients with SCLC were enrolled onto this study. Patients were examined by a neurologist on a regular basis.

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Background: For the moment, scientific evaluation of programs on treatment of pregnancy-related pelvic girdle and/or low back pain after delivery is hardly available with only one study with a positive result, suggesting uncertainty about the optimal approach. Investigators draw particular attention to biomedical factors but there is growing evidence that biopsychosocial factors appear to be even more important as a basis of an intervention program.

Methods: We studied the effectiveness of a tailor-made program with respect to biopsychosocial factors (intervention group) in women with pregnancy-related pelvic girdle and/ or low back pain versus usual care based on a pain contingent basis (control group) shortly after delivery in a randomized controlled trial.

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Foot orthoses are widely used to treat various foot problems. A literature search revealed no publications on differences in plantar pressure distribution resulting from casting methods for foot orthoses. Four casting methods were used for construction of orthoses.

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Background: There is a need for evidence of clinical effectiveness of foot orthosis therapy. This study evaluated the effect of foot orthoses made by ten podiatrists, ten pedorthists and eleven orthotists on plantar pressure and walking convenience for three patients with metatarsalgia. Aims were to assess differences and variability between and within the disciplines.

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Background: The current study was performed to investigate the frequency of leptomeningeal metastases (LMM) in patients with small cell lung carcinoma (SCLC) as well as the effect of LMM on survival, any correlation between the location of the LMM and survival, and a possible increased risk of LMM among patients with brain metastases (BM) located in the posterior fossa.

Methods: Between 1980-2003, 458 consecutive patients with SCLC were enrolled in the current study. Patients underwent regular neurologic examination and imaging of the brain before, during, and after treatment.

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Background And Objective: The use of randomized consent designs has been subject of methodologic and ethical controversy. In most Western countries, research ethics committees make the decision as to whether a randomized consent design can be applied. The purpose of the study is to assess to what extent a randomized consent design and a modification of this design is accepted by research ethics committees, in terms of ethics, health law, and methodology.

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Background: Neurologic complications are an important cause of morbidity and possibly also mortality in patients with small cell lung carcinoma (SCLC). The current study was undertaken to prospectively investigate survival and the frequency of neurologic disorders in patients with SCLC.

Methods: Between October 1980 and September 2001, 432 consecutive patients with microscopically proven SCLC were included in the current study.

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Study Design: A systematic review of randomized controlled trials.

Background: Although several rehabilitation programs, physical fitness programs, or protocols regarding instruction for patients to return to work after lumbar disc surgery have been suggested, little is known about the efficacy of these treatments, and there are still persistent fears of causing reinjury, reherniation, or instability.

Objectives: The objective of this systematic review was to evaluate the effectiveness of active treatments that are used in the rehabilitation after first-time lumbar disc surgery.

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