Publications by authors named "Boudewijn Kollen"

Objective: Health care expenditures for children with functional constipation (FC) are high, while conservative management is successful in only 50% of the children. The aim is to evaluate whether adding physiotherapy to conventional treatment (CT) is a cost-effective strategy in the management of children with FC aged 4-18 years in primary care.

Methods: A cost-effectiveness analysis was performed alongside a randomized controlled trial (RCT) with 8-month follow-up.

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Background: Acute gastroenteritis (AGE) affects almost all children aged ≤5 years. In secondary care, ondansetron was found to be effective at reducing vomiting.

Aim: To determine the effectiveness of adding oral ondansetron to care as usual (CAU) to treat vomiting in children with AGE attending out-ofhours primary care (OOH-PC).

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Background: Stroke affects the neuronal networks of the non-infarcted hemisphere. The central motor conduction time (CMCT) induced by transcranial magnetic stimulation (TMS) could be used to determine the conduction time of the corticospinal tract of the non-infarcted hemisphere after a stroke.

Objectives: Our primary aim was to demonstrate the existence of prolonged CMCT in the non-infarcted hemisphere, measured within the first 48 h when compared to normative data, and secondly, if the severity of motor impairment of the affected upper limb was significantly associated with prolonged CMCTs in the non-infarcted hemisphere when measured within the first 2 weeks post stroke.

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Background: Acute gastroenteritis is a common childhood condition with substantial medical and indirect costs, mostly because of referral, hospitalisation, and parental absence from work.

Aim: To determine the cost-effectiveness of adding oral ondansetron to care as usual (CAU) for children with acute gastroenteritis presenting to out-of-hours primary care (OOH-PC).

Design And Setting: A pragmatic randomised controlled trial from December 2015 to January 2018, at three OOHPC centres in the north of the Netherlands (Groningen, Zwolle, and Assen) with a follow-up of 7 days.

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Purpose: Electronic application (app)-based treatment is promising for common diseases with good conservative management options, such as urinary incontinence (UI) in women, but its effectiveness compared with usual care is unclear. This study set out to determine if app-based treatment for women with stress, urgency, or mixed UI was noninferior to usual care in the primary care setting.

Methods: The URinControl trial is a pragmatic, noninferiority randomized controlled trial in Dutch primary care including adult women with 2 episodes of UI per week.

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Background: Research in primary care is essential, but recruiting children in this setting can be complex and may cause selection bias. Challenges surrounding informed consent, particularly in an acute clinical setting, can undermine feasibility. The off-protocol use of an intervention nearing implementation has become common in pragmatic randomised controlled trials (RCTs) set in primary care.

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Background: Hospital admission rates are increasing for children with acute gastroenteritis. However, it is unknown whether this increase is accompanied by an increase in referral rates from GPs due to increased workloads in primary care out-of-hours (OOH) services.

Aim: To assess trends in referral rates from primary care OOH services to specialist emergency care for children presenting with acute gastroenteritis.

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Objectives: Caregivers for people with dementia (PWD) have reported needing emotional and social support, improved coping strategies, and better information about the illness and available support services. In this study, we aimed to determine the effectiveness of an Australian multicomponent community-based training program that we adapted and implemented in a non-medical Dutch health care setting.

Methods And Design: A randomized controlled trial was performed: 142 dyads of cohabiting caregivers and PwD were randomized to control (care as usual) or intervention (training program) groups and outcomes were compared.

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Objectives: The objective of the study was to assess the impact of recruitment strategy on the baseline characteristics of patients recruited in a randomized controlled trial for treating women with urinary incontinence.

Study Design And Setting: We conducted a cross-sectional analysis of baseline data from an earlier trial. Women were recruited through the media (including social media) or from participating general practices.

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Objective: To determine the effectiveness of physiotherapy plus conventional treatment compared with conventional treatment alone for the treatment of functional constipation in children age 4-17 years in primary care.

Study Design: Pragmatic randomized controlled trial with 8 months follow-up. Primary care physicians recruited children diagnosed with functional constipation (n = 234), and pediatricians recruited newly referred children with a diagnosis of functional constipation (n = 11).

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Background: Psychotropic drugs are often prescribed to treat neuropsychiatric symptoms in nursing home residents with dementia, despite having limited efficacy and considerable side effects. To reduce the inappropriate prescribing of these psychotropic drugs, various non-pharmacological, psychosocial, person-centered, or multidisciplinary interventions are advocated. However, existing multidisciplinary interventions have shown variable effects, with limited effectiveness often resulting from suboptimal implementation.

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Objectives: Minimal clinically important differences (MCIDs) are used as fixed numbers in the interpretation of clinical trials. Little is known about its dynamics. This study aims to explore the impact of baseline score, study setting, and patient characteristics on health status MCIDs in chronic obstructive pulmonary disease (COPD).

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Objectives: Clinicians should not only know how many patients will benefit from alpha-blocker therapy but should also be able to identify who will benefit. We studied the changes in patient symptoms following alpha-blocker therapy and the predictors of symptom improvement in clinical practice.

Design: This was a single-arm, open-label observational cohort study with a 6-week follow-up.

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Purpose: Children with bronchopulmonary dysplasia often develop complications that affect them well into adult life. Very little is known about how this affects their quality of life, since no sensitive instrument is available to measure health-related quality of life in this population. In this study, a Dutch parent-proxy instrument was developed for this purpose.

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Background: Caring for people with dementia imposes heavy burdens on caregivers, especially spouses. This can lead to depression, anxiety, and physical symptoms in the caregiver, with early institutionalization for the patient. An Australian study reported that a residential caregiver training program delivered in medical settings could delay nursing home admission, lower mortality, reduce psychological morbidity in caregivers, and lower healthcare costs.

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Background: Although the effectiveness of pelvic floor muscle training in women with prolapse has been demonstrated in several studies, there seem to be subgroups of responders and nonresponders.

Objective: The objective of this study was to identify factors that predict treatment success in women receiving pelvic floor muscle training for prolapse.

Design: The design was a secondary analysis of data from 2 randomized controlled trials comparing conservative prolapse treatments.

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Objective: The aim of the review is to perform a systematic review of the literature examining the prevalence of bladder symptoms in children with functional constipation (FC) and to compare the prevalence of those symptoms between children with and without FC.

Methods: In this systematic review 4 databases were searched to July 2018. Studies investigating the prevalence of bladder symptoms in children aged 4 to 17 years with FC were included.

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Objective: Functional constipation (FC) has a major impact on the health-related quality of life (HRQoL) of children. The aim of this study was to evaluate parent-child agreement on HRQoL in children (8-17 years) with FC in primary care.

Methods: Children diagnosed with FC by their clinician were eligible.

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Background: Our aim was to design a study to evaluate the effectiveness and cost-effectiveness of adding physiotherapy to conventional treatment for children with functional constipation in primary care. Physiotherapy is focusing on improving the coordination between the pelvic floor and abdominal musculature during bowel movement, while conventional treatment is mainly focusing on symptomatic relief of symptoms, therefore, we expect the effects of physiotherapy will be more sustainable than the effects of conventional treatment. In this paper we describe the final study design and how the design was adapted, to overcome recruitment problems.

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Background: The added prognostic value of transcranial magnetic stimulation (TMS)-induced motor-evoked potentials (MEPs) to clinical modeling for the upper limb is still unknown early poststroke.

Objective: To determine the added prognostic value of TMS of the adductor digiti minimi (TMS-ADM) to the clinical model based on voluntary shoulder abduction (SA) and finger extension (FE) during the first 48 hours and at 11 days after stroke.

Methods: This was a prospective cohort study with 3 logistic regression models, developed to predict upper-limb function at 6 months poststroke.

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Background And Purpose: There is growing evidence that visuospatial neglect (VSN) is associated with lower functional performance in other modalities and is not restricted to the lesioned hemisphere alone, and may also affect the non-lesioned hemisphere in severe first-ever strokes. We aimed to investigate the longitudinal association between the severity of VSN, as reflected by the extent of ipsilesional and contralesional spatial attention deficit, and clinical severity of stroke.

Methods: This is a secondary data analysis with merged data from two prospective cohort studies.

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Objective: To evaluate the perceived quality of the learning environment, before and after introduction of competency-based postgraduate orthopedic education.

Design: From 2009 to 2014, we conducted annual surveys among Dutch orthopedic residents. The validated Dutch Residency Educational Climate Test (D-RECT, 50 items on 11 subscales) was used to assess the quality of the learning environment.

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Background: Dementia is often accompanied by neuropsychiatric symptoms. Psychotropic drugs for the treatment of neuropsychiatric symptoms are frequently used to manage these problems, but they are of limited effectiveness and can have serious side effects. Psychosocial interventions are advocated as first line treatment and may help to reduce psychotropic drug use.

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