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Dive into the research topics where Ad Prins is active.

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Featured researches published by Ad Prins.


Journal of the American Geriatrics Society | 2001

Correlates for Erectile and Ejaculatory Dysfunction in Older Dutch Men: A Community‐Based Study

Marco H. Blanker; Arthur M. Bohnen; Frans P.M.J. Groeneveld; Roos Bernsen; Ad Prins; Siep Thomas; J.L.H. Ruud Bosch

OBJECTIVES: We estimated correlates for erectile dysfunction (ED) (defined as a report of erections of severely reduced rigidity or no erections) and ejaculatory dysfunction (EjD) (defined as a report of ejaculations with significantly reduced volume or no ejaculations) in a large community sample of older men.


Urology | 2001

Erectile and ejaculatory dysfunction in a community-based sample of men 50 to 78 years old: prevalence, concern, and relation to sexual activity ☆

Marco H. Blanker; J.L.H. Ruud Bosch; Frans P.M.J. Groeneveld; Arthur M. Bohnen; Ad Prins; Siep Thomas; Wim C. J. Hop

OBJECTIVES To determine the prevalence rates of erectile and ejaculatory dysfunction, associated bother, and their relation to sexual activity in a population-based sample of elderly men.Methods. Data were collected from 1688 men by way of self-administered questionnaires (including the International Continence Society male sex questionnaire) and measurements at a health center and urology outpatient department. RESULTS The prevalence of significant erectile dysfunction (ie, erections of severely reduced rigidity or no erections) increased from 3% in men 50 to 54 years old to 26% in men 70 to 78 years old. In the same age strata, the prevalence of significant ejaculatory dysfunction (ie, ejaculations with significantly reduced volume or no ejaculations) increased from 3% to 35%. Pain or discomfort during ejaculation was rare (1%) and independent of age. In general, men were more concerned about erectile dysfunction than about ejaculatory dysfunction. However, most men had no or only little concern about their dysfunction. The percentage of men who reported being sexually active declined with increasing age and was lower in men with erectile and ejaculatory dysfunction and in men without a partner. In sexually active men, 17% to 28% had no normal erections, indicating that with advancing age normal erections are not an absolute prerequisite for a sexually active life. CONCLUSIONS Erectile and ejaculatory dysfunction are common in elderly men. The results of this study indicate that these conditions are much less of a problem for older men than previously suggested.


The Journal of Urology | 2000

NORMAL VOIDING PATTERNS AND DETERMINANTS OF INCREASED DIURNAL AND NOCTURNAL VOIDING FREQUENCY IN ELDERLY MEN

Marco H. Blanker; Arthur M. Bohnen; Frans P.M.J. Groeneveld; Roos Bernsen; Ad Prins; J.L.H. Ruud Bosch

PURPOSE We determined the normal value of diurnal and nocturnal voiding frequency, and its determinants in a population based sample of elderly men. MATERIALS AND METHODS We collected data on 1,688 men 50 to 78 years old recruited from the population of Krimpen, The Netherlands. Measurements consisted of self-administered questionnaires, including the International Prostate Symptom Score (I-PSS), a 3-day frequency-volume chart, transrectal prostatic ultrasound, uroflowmetry and post-void residual urine volume measurement. RESULTS Diurnal voiding frequency is independent of age and more frequent in men with benign prostatic hyperplasia (BPH). Nocturia 2 or more times is present in 30% of men 50 to 54 and in 60% of those 70 to 78 years old, while nocturia 3 or more times is present in 4% and 20%, respectively. In addition, nocturia is strongly associated with BPH and nocturnal polyuria but apparently not with cardiovascular symptoms, hypertension or diabetes mellitus. We noted poor agreement of the responses on the frequency-volume charts and the I-PSS question on nocturia. Using the I-PSS leads to a higher prevalence of nocturia. CONCLUSIONS Diurnal frequency is independent of age (median 5 voids, interquartile range 4 to 6) but higher in men with BPH. Nocturia increases with advancing age and is more frequent in men with nocturnal polyuria. BPH is an independent risk factor for nocturia and increased diurnal voiding frequency. In those with nocturia there is a great difference in subjective symptoms and objective data, indicating that the weight of the I-PSS question on nocturia for making treatment decisions should be reconsidered.


Patient Education and Counseling | 2004

Perceptions of cardiovascular risk among patients with hypertension or diabetes

B.D. Frijling; C.M. Lobo; Inge M. Keus; Kathleen M. Jenks; R.P. Akkermans; M.E.J.L. Hulscher; Ad Prins; Johannes C. van der Wouden; Richard Grol

We aimed to examine risk perceptions among patients at moderate to high cardiovascular risk. A questionnaire about perceived absolute risk of myocardial infarction and stroke was sent to 2424 patients with hypertension or diabetes. Response rate was 86.3% and 1557 patients without atherosclerotic disease were included. Actual cardiovascular risk was calculated by using Framingham risk functions. A total of 363 (23.3%) of the 1557 patients did not provide any risk estimates and these were particularly older patients, patients with a lower educational level, and patients reporting no alcohol consumption. The remaining 1194 patients tended to overestimate their risk. In 42.3% (497/1174) and 46.8% (541/1155) of the cases, patients overestimated their actual 10-year risk for myocardial infarction and stroke, respectively, by more than 20%. Older age, smoking, familial history of cardiovascular disease (CVD), and actual absolute risk predicted higher levels of perceived absolute risk. Male sex, higher scores for an internal health locus of control, lower scores for a physician locus of control, and self-rated excellent or (very) good health were positively related to higher accuracy. In conclusion, patients showed inadequate perceptions of their absolute risk of cardiovascular events and physicians should thus provide greater information about absolute risk when offering preventive therapy.


BJUI | 2001

Strong effects of definition and nonresponse bias on prevalence rates of clinical benign prostatic hyperplasia: the Krimpen study of male urogenital tract problems and general health status.

Marco H. Blanker; Frans P.M.J. Groeneveld; Ad Prins; Roos Bernsen; Arthur M. Bohnen; J.L.H.R. Bosch

Objective To estimate the prevalence of benign prostatic hyperplasia (BPH) in the community, and study the influence of BPH definition, age and response bias on prevalence rates.


Clinical Rehabilitation | 1998

Comparison between two devices for measuring hip joint motions

S Ma Bierma-Zeinstra; Arthur M. Bohnen; R Ramlal; J Ridderikhoff; J An Verhaar; Ad Prins

Objective: To compare the reliability of measurements of hip motions obtained with two instruments, an electronic inclinometer and a two-arm goniometer, and to investigate whether the two instruments, and different body positions, produce the same measurement data. Methods: Maximal active and passive hip movements were measured simultaneously with both instruments, in nine subjects during 10 consecutive measurements at short intervals. Results: Intra-observer variability was lower with the inclinometer in measurements of passive hip rotations. The two instruments showed equal intra-observer variability for hip movements in general. The inclinometer showed lower inter-observer variability in the measurements of active internal rotation. More rotational movement was measured with the two-arm goniometer; more extension and flexion with the inclinometer. Also, more rotational movement was found in the prone position compared to sitting and supine positions. Conclusions: The inclinometer is more reliable in measurements of hip rotation. For hip movements in general the two-arm goniometer is just as accurate when used by only one observer. The two instruments, and some positions, are not interchangeable during consecutive measurements.


Diabetic Medicine | 2002

Multifaceted support to improve clinical decision making in diabetes care: a randomized controlled trial in general practice

B.D. Frijling; C.M. Lobo; M.E.J.L. Hulscher; R.P. Akkermans; Jozé Braspenning; Ad Prins; J.C. van der Wouden; R.P.T.M. Grol

Aims To evaluate the effectiveness of a multifaceted intervention to improve the clinical decision making of general practitioners (GPs) for patients with diabetes. To identify practice characteristics which predict success.


Quality & Safety in Health Care | 2003

Intensive support to improve clinical decision making in cardiovascular care: a randomised controlled trial in general practice

B.D. Frijling; C.M. Lobo; M.E.J.L. Hulscher; R.P. Akkermans; B.B. van Drenth; Ad Prins; J.C. van der Wouden; R.P.T.M. Grol

Objective: To evaluate the effects of feedback reports combined with outreach visits from trained non-physicians on the clinical decision making of general practitioners (GPs) in cardiovascular care. Design: Pragmatic cluster controlled trial with randomisation of practices to support (intervention group) or no special attention (control group); analysis after 2 years. Setting: 124 general practices in The Netherlands. Participants: 185 GPs. Main outcome measures: Compliance rates for 12 evidence-based indicators for the management of patients with hypertension, hypercholesterolaemia, angina pectoris, or heart failure. The evaluation relied on the prospective recording of patient encounters by the participating GPs. Results: The GPs reported 30 101 clinical decisions at baseline and 22 454 decisions after the intervention. A significant improvement was seen for five of the 12 indicators: assessment of risk factors in patients with hypercholesterolaemia (odds ratio 2.04; 95% CI 1.44 to 2.88) or angina pectoris (3.07; 1.08 to 8.79), provision of information and advice to patients with hypercholesterolaemia (1.58, 1.17 to 2.13) or hypertension (1.55, 1.35 to 1.77), and checking for clinical signs of deterioration in patients with heart failure (4.11, 2.17 to 7.77). Single handed practices, non-training practices, and practices with older GPs gained particular benefit from the intervention. Conclusions: Intensive support from trained non-physicians can alter certain aspects of the clinical decision making of GPs in cardiovascular care. The effect is small and the strategy needs further development.


Journal of Epidemiology and Community Health | 1998

Validity and accuracy of interview and diary data on children's medical utilisation in The Netherlands.

Marc Bruijnzeels; J.C. van der Wouden; Marleen Foets; Ad Prins; W. van den Heuvel

STUDY OBJECTIVE: To assess the validity and accuracy of childrens medical utilisation estimates from a health interview and diary and the possible consequences for morbidity estimates. The influence of recall bias and respondent characteristics on the reporting levels was also investigated. DESIGN: Validity study, with the medical record of the general practitioner (GP) as gold standard. In a health interview and three week diary estimates of medical utilisation of children were asked and compared with a GPs medical record. SETTING: General community and primary care centre in the Netherlands. PARTICIPANTS: Parents of 1,805 children and 161 GPs. MAIN RESULTS: The sensitivity of the interview (0.84) is higher than the diary (0.72), while specificity and kappa are higher in the diary (0.96; 0.64) than in the interview (0.91; 0.5-8). Recall bias, expressed as telescoping and heaping, is present in the interview data. Prevalence estimates of all morbidity are much higher in the interview, except for skin problems. Compared with a parental diary more consultations are reported exclusively by the GP for children from ethnic minorities (OR 1.6), jobless (OR 2.3), and less educated mothers (OR 2.6). CONCLUSIONS: Estimates of medical utilisation rates of children are critically influenced by the method of data collection used. Interviews are prone to introduce recall bias, while diaries should only be used in populations with an adequate level of literacy. It is recommended that medical records are used, as they produce most consistent estimates.


The Journal of Urology | 2002

Normal Values and Determinants of Circadian Urine Production in Older Men: A Population Based Study

Marco H. Blanker; Roos Bernsen; J.L.H. Ruud Bosch; Siep Thomas; Frans P.M.J. Groeneveld; Ad Prins; Arthur M. Bohnen

PURPOSE We evaluated circadian urine production and its determinants in a large population based sample of older men. MATERIALS AND METHODS We collected data on 1,688 men 50 to 78 years old, without radical prostatectomy, prostate or bladder cancer, neurogenic bladder disease or negative advice from their general practitioner, recruited from the population of Krimpen, the Netherlands. Measurements consisted of self-administered questionnaires, including the International Prostate Symptom Score, a 3-day frequency-volume chart, transrectal prostatic ultrasound, uroflowmetry and post-void residual volume. Hourly urine production was determined and urine production day-to-night ratio was calculated from the frequency-volume chart. RESULTS Men younger than 65 years showed a clear circadian urine production pattern, whereas in older men this pattern was less clear. Smoking, use of diuretic drugs, post-void residual and 24-hour polyuria reinforced the circadian pattern, in favor of daytime urine production. The urine production day-to-night ratio was not associated with prostate enlargement, reduced urinary flow rate, body weight, hypertension, cardiac symptoms, diabetes mellitus, use of antidepressants, cardiac or hypnotic drugs. CONCLUSIONS Urine production in men younger than 65 years showed a clear circadian pattern in contrast to men older than 65 years. These data can be used as a reference when describing urine production patterns in select populations. In daily practice frequency-volume charts can be used to determine urine production. This method is inexpensive, easy to use and provides valid information on urine production in a natural environment.

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Arthur M. Bohnen

Erasmus University Rotterdam

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Roos Bernsen

United Arab Emirates University

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B.D. Frijling

Radboud University Nijmegen

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C.M. Lobo

Erasmus University Rotterdam

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M.E.J.L. Hulscher

Radboud University Nijmegen

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Siep Thomas

Erasmus University Rotterdam

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J.C. van der Wouden

Erasmus University Rotterdam

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