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Dive into the research topics where Henk M. van der Ploeg is active.

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Featured researches published by Henk M. van der Ploeg.


Annals of Neurology | 2003

Epilepsy in low-grade gliomas: the impact on cognitive function and quality of life.

Martin Klein; Nadine H. J. Engelberts; Henk M. van der Ploeg; Dorothée Kasteleijn-Nolst Trenité; Neil K. Aaronson; Martin J. B. Taphoorn; Hans Baaijen; W. Peter Vandertop; Martin J. Muller; Tjeerd J. Postma; Jan J. Heimans

Low‐grade gliomas frequently are associated with epilepsy. The purpose of this study is to determine the impact of epilepsy and antiepileptic drug (AED) treatment on cognitive functioning and health‐related quality of life (HRQOL) in these patients. One hundred fifty‐six patients without clinical or radiological signs of tumor recurrence for at least 1 year after histological diagnosis and with an epilepsy burden (based on seizure frequency and AED use) ranging from none to severe were compared with healthy controls. The association between epilepsy burden and cognition/HRQOL was also investigated. Eighty‐six percent of the patients had epilepsy and 50% of those using AEDs actually were seizure‐free. Compared with healthy controls, glioma patients had significant reductions in information processing speed, psychomotor function, attentional functioning, verbal and working memory, executive functioning, and HRQOL. The increase in epilepsy burden that was associated with significant reductions in all cognitive domains except for attentional and memory functioning could primarily be attributed to the use of AEDs, whereas the decline in HRQOL could be ascribed to the lack of complete seizure control. In conclusion, low‐grade glioma patients suffer from a number of neuropsychological and psychological problems that are aggravated by the severity of epilepsy and by the intensity of the treatment.


Social Psychiatry and Psychiatric Epidemiology | 2006

Physical and mental health of Afghan, Iranian and Somali asylum seekers and refugees living in the Netherlands

Annette A. M. Gerritsen; I. Bramsen; W. Devillé; Loes H. M. van Willigen; Johannes E. Hovens; Henk M. van der Ploeg

ContextWorldwide, the number of refugees and asylum seekers is estimated to be about 11.5 million plus a much larger number of former refugees who have obtained a residence permit in a new country. Although asylum seekers have been coming to the Netherlands since the 1980s, very few epidemiological studies have focused on this group of inhabitants or on the refugees who have resettled in this country.ObjectivesThe objectives of this study were to estimate the prevalence rates of physical and mental health problems and to identify the risk factors for these complaints.Design, Setting, and ParticipantsA population-based study was conducted in the Netherlands from June 2003 to April 2004 among adult refugees and asylum seekers from Afghanistan, Iran and Somalia. Asylum seekers were living in 14 randomly selected reception centres, and random samples of refugees were obtained from the population registers of three municipalities (Arnhem, Leiden and Zaanstad). A total of 178 refugees and 232 asylum seekers participated (response rates of 59 and 89%, respectively).Main Outcome MeasuresGeneral health and physical health were measured with the Short-Form 36 and a list of 19 chronic conditions, respectively; symptoms of post-traumatic stress disorder (PTSD), depression and anxiety, were measured with the Harvard Trauma Questionnaire and the Hopkins Symptoms Checklist-25.ResultsMore asylum seekers (59.1%) than refugees (42.0%) considered their health to be poor (P=0.001). In both groups, approximately half of the respondents suffered from more than one chronic condition. More asylum seekers than refugees had symptoms of PTSD (28.1 and 10.6%, respectively; P=0.000) and depression/anxiety (68.1 and 39.4, respectively; P=0.000). Respondents from Afghanistan and, in particular, from Iran had a higher risk for PTSD and depression/anxiety. Female gender was associated with chronic conditions, PTSD and depression/anxiety, and higher age was associated with poor general health and chronic conditions. A greater number of traumatic events was associated with all health outcomes, and more post-migration stress and less social support were associated with PTSD and depression/anxiety symptoms.ConclusionsBoth physical and mental health problems are highly prevalent among refugees and asylum seekers in the Netherlands. Although higher prevalence rates for most health outcomes were found among asylum seekers, both the specific health services for asylum seekers and the general health services in the municipalities should be aware of these problems.


Patient Education and Counseling | 2000

Psychological distress two years after diagnosis of breast cancer: frequency and prediction

E.M.A. Bleiker; Frans Pouwer; Henk M. van der Ploeg; Jan-Willem H. Leer; H.J. Adèr

The present prospective study aimed at (1) investigating the frequency of high levels of psychological distress in women with early-stage breast cancer almost two years after diagnosis and (2) identifying characteristics associated with long-term distress. One hundred and seventy women participated on two occasions. Two months after surgery, patients completed questionnaires measuring psychosocial variables (e.g., stressful life-events, health complaints, sleep problems, social support, subjective distress, personality factors), demographic and biomedical variables (e.g., TNM status, type of surgery). At the second measurement, subjective distress was assessed for a second time by means of the Impact of Events Scale (IES). Almost two years after diagnosis, 16% of the women reported a high level of psychological distress as measured by the Intrusion scale (IES). Best predictors of a high level of distress were: intrusive thoughts about the disease, trait-anxiety, health complaints and problems with sleeping. No significant association was found between previous life-events, social support or biomedical variables and levels of distress.


Journal of Clinical Oncology | 2001

Neurobehavioral Status and Health-Related Quality of Life in Newly Diagnosed High-Grade Glioma Patients

Martin Klein; Martin J. B. Taphoorn; Jan J. Heimans; Henk M. van der Ploeg; W. Peter Vandertop; Egbert F. Smit; Sieger Leenstra; Cees A. F. Tulleken; Willem Boogerd; J. Belderbos; Wilmy Cleijne; Neil K. Aaronson

PURPOSE To evaluate the health-related quality of life (HRQOL) and cognitive functioning of high-grade glioma patients in the postneurosurgical period. PATIENTS AND METHODS The HRQOL, as assessed by the Short-Form Health Survey-36, tumor-specific symptoms, and objective and subjective neuropsychologic functioning, of 68 newly diagnosed glioma patients were compared with that of 50 patients with non-small-cell lung cancer (NSCLC) and to age- and sex-matched healthy controls. The association between tumor lateralization, extent of resection, and use of medication, and the HRQOL outcomes was also investigated. RESULTS The HRQOL of the two patient groups was similar but significantly lower than that of the healthy controls. Glioma patients reported significantly more neurologic symptoms and poorer objective and subjective neuropsychologic functioning than the NSCLC patients. Using healthy controls as the reference group, cognitive impairment assessed at the individual patient level was observed in all glioma patients and 52% of the NSCLC patients. Poor performance on timed tasks in the glioma group could be attributed, in large part, to visual and motor deficits. Tumor lateralization was found to affect neuropsychologic functioning in a predictable manner. The extent of resection was not related significantly to neuropsychologic functioning. Corticosteroid use was associated with better recognition memory, whereas antiepileptic drug use was correlated negatively with working memory capacity. CONCLUSION The general HRQOL of glioma patients is similar to that of patients with NSCLC. However, they suffer from a number of condition-specific neurologic and neuropsychologic problems that have a significant impact on their daily lives in the postsurgical period, before treatment with radiotherapy.


Neuro-oncology | 2007

The course of neurocognitive functioning in high-grade glioma patients

Ingeborg Bosma; Maaike J. Vos; Jan J. Heimans; Martin J. B. Taphoorn; Neil K. Aaronson; Tjeerd J. Postma; Henk M. van der Ploeg; Martin J. Muller; W. Peter Vandertop; Ben J. Slotman; Martin Klein

We evaluated the course of neurocognitive functioning in newly diagnosed high-grade glioma patients and specifically the effect of tumor recurrence. Following baseline assessment (after surgery and before radiotherapy), neurocognitive functioning was evaluated at 8 and 16 months. Neurocognitive summary measures were calculated to detect possible deficits in the domains of (1) information processing, (2) psychomotor function, (3) attention, (4) verbal memory, (5) working memory, and (6) executive functioning. Repeated-measures analyses of covariance were used to evaluate changes over time. Thirty-six patients were tested at baseline only. Follow-up data were obtained for 32 patients: 14 had a follow-up at 8 months, and 18 had an additional follow-up at 16 months. Between baseline and eight months, patients deteriorated in information-processing capacity, psychomotor speed, and attentional functioning. Further deterioration was observed between 8 and 16 months. Of 32 patients, 15 suffered from tumor recurrence before the eight-month follow-up. Compared with recurrence-free patients, not only did patients with recurrence have lower information-processing capacity, psychomotor speed, and executive functioning, but they also exhibited a more pronounced deterioration between baseline and eight-month follow-up. This difference could be attributed to the use of antiepileptic drugs in the patient group with recurrence. This study showed a marked decline in neurocognitive functioning in HGG patients in the course of their disease. Patients with tumor progression performed worse on neurocognitive tests than did patients without progression, which could be attributed to the use of antiepileptic drugs. The possibility of deleterious effects is important to consider when prescribing antiepileptic drug treatment.


Psychological Reports | 1994

COGNITION, STUDY HABITS, TEST ANXIETY, AND ACADEMIC PERFORMANCE

Wim Chr. Kleijn; Henk M. van der Ploeg; Robert M. Topman

The Study Management and Academic Results Test (SMART) was developed to measure study- and examination-related cognitions, time management, and study strategies. This questionnaire was used in three prospective studies, together with measures for optimism and test anxiety. In the first two studies, done among 253 first-year students enrolled in four different faculties, the highest significant correlations with academic performance were found for the SMART scales. In a replication study among first-year medical students (n = 156) at a different university, the same pattern of results was observed. A stepwise multiple regression analysis, with academic performance as a dependent variable, showed significant correlations only for the SMART Test Competence and Time Management (Multiple R = .61). Results give specific indications about the profile of successful students.


Journal of Traumatic Stress | 2000

Health Problems Among Latin-American and Middle-Eastern Refugees in the Netherlands: Relations With Violence Exposure and Ongoing Sociopsychological Strain

Adger J.K. Hondius; Loes H. M. van Willigen; Wim Chr. Kleijn; Henk M. van der Ploeg

In two studies (n = 480; n = 156), the health problems (somatic, psychological, and migration-related complaints) of refugees were examined, in relation to violence, demographic, and asylum variables (ongoing sociopsychological strain). High frequencies for torture events and a substantial number of medical complaints were reported, but few cases of diagnosable Posttraumatic Stress Disorder (PTSD) were identified (Study I: 6%; Study II: 11%). Not only reported violence, but also the current social situation contributed to the experiencing of ongoing health complaints. Refugees attributed their somatic and psychological complaints to illness (48%) and to torture (29%) and psychological complaints, in particular, to worries related to the postmigration situation (40%). Paying attention only to health complaints and to past violent experiences is too limited an approach in responding to the needs of refugees.


Personality and Individual Differences | 2003

Social support, coping, life events, and posttraumatic stress symptoms among former peacekeepers: a prospective study

Anja J. E. Dirkzwager; I. Bramsen; Henk M. van der Ploeg

Abstract This study examined both cross-sectionally and longitudinally the relationship between social support, coping strategies, additional stressful life events, and symptoms of posttraumatic stress disorder (PTSD) among Dutch former peacekeeping soldiers. Two groups of peacekeepers were investigated: 311 peacekeepers who participated in the peacekeeping operation in Lebanon between 1979 and 1985, and 499 peacekeepers who were deployed after 1990. These peacekeepers completed a questionnaire in 1996 and again in 1998. The results show that more negative social contacts and fewer positive social contacts were associated with more PTSD symptom severity. More use of the coping strategies ‘wishful thinking’ and ‘accepting responsibility’ was related to more PTSD symptoms. Conversely, more planful problem solving and seeking social support was related to less PTSD symptom severity. In addition, a bilateral relationship was found between additional stressful life events and PTSD symptom severity. The results indicate that social support and coping strategies may be valuable aspects of prevention and intervention programs.


Epilepsia | 2002

The Effectiveness of Cognitive Rehabilitation for Attention Deficits in Focal Seizures: A Randomized Controlled Study

Nadine H.J. Engelberts; Martin Klein; H.J. Adèr; Jan J. Heimans; Dorothée Kasteleijn-Nolst Trenité; Henk M. van der Ploeg

Summary:  Purpose: Cognitive deficits are one of the major limiting factors in the everyday life functioning of patients with focal seizures. Although cognitive rehabilitation methods have been successfully applied to patients with other central nervous system (CNS) lesions, these methods have not yet been evaluated in cognitively impaired patients with epilepsy. The present study evaluated the effectiveness of two commonly used methods for attention deficits: (a) the Retraining Method, aimed at retraining impaired cognitive functions; and (b) the Compensation Method, aimed at teaching compensatory strategies while taking neuronal loss for granted.


Journal of Traumatic Stress | 2001

Consistency of Self-Reports of Traumatic Events in a Population of Dutch Peacekeepers: Reason for Optimism?

Inge Bramsen; Anja J. E. Dirkzwager; Suzanne C. M. van Esch; Henk M. van der Ploeg

Doubts have been raised concerning the reliability and the validity of self-reports of traumatic events. A correlation between the number of inconsistencies in self-reports and the level of PTSD symptoms has been found. We examine whether these results can be generalized to a population of 137 Dutch peacekeepers who took part in operation UNTAC (United Nations Transitional Authority in Cambodia). The peacekeepers completed a 16-item trauma checklist, 3 and 4 years after their return from UNTAC. The test-retest reliability of the trauma checklist was adequate. Inconsistencies were randomly divided over all respondents and all items and were not correlated with symptoms of PTSD. No increase in the number of reported events over time was found. Earlier findings raising doubts concerning the reliability and validity of self-report measures of exposure were not replicated in this sample of Dutch peacekeepers.

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Inge Bramsen

VU University Medical Center

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Martin Klein

VU University Medical Center

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Wim Chr. Kleijn

Leiden University Medical Center

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H.J. Adèr

VU University Medical Center

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Jan J. Heimans

VU University Medical Center

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I. Bramsen

VU University Amsterdam

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Frank J. Snoek

Public Health Research Institute

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