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Biomedical subjects

J L Bosch

Publications and source records attributed to J L Bosch.

At least 37 records · Page 2Linked to original sources
PubMed2000

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.

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. Subjects and methods A community-based longitudinal study of 3924 men aged 50-75 years was conducted in a Dutch municipality (Krimpen) near Rotterdam. Data from those responding were collected using self-administered questionnaires, and during visits to the health centre and outpatient clinic of the urology department. The questionnaires included symptom scores on general well being (Inventory of Subjective Health, ISH) and lower urinary tract symptoms (International Prostate Symptom Score, IPSS). A short version of the questionnaire (including the IPSS and ISH) was sent to a random sample of those not responding. All subjects participating fully underwent a physical examination, uroflowmetry, transrectal ultrasonometry of the prostate and had their prostate specific antigen level measured. Age-specific prevalence rates of BPH were estimated using different definitions, based on one or more of symptom severity, prostate volume and maximum flow rate. The influence of response bias was estimated using the questionnaires. RESULTS: The response rate was 50% (full participants). Of those not responding, 55% completed a short version of the questionnaire (partial participants). Compared with full participants, partial participants had a lower IPSS and slightly lower ISH. The prevalence rates of clinical BPH in the study population was 9-20% (95% confidence interval, 8-11% to 22-27%) depending on the definition used. After adjusting for nonresponse bias, the age-group specific prevalences for 5-year age strata were 1.1-1.8 times lower for all BPH definitions used. CONCLUSIONS: The prevalence rates of clinical BPH depend largely on the definition used and increase strongly with age. The effect of age is stronger when more variables are included in the definition. Adjustment for response bias results in substantially lower prevalence rates.

Age Distribution↗
PubMed2000

The contemporary role of the artificial urinary sphincter.

The artificial urinary sphincter has been in use for more than 25 years as a treatment for urinary incontinence due to intrinsic sphincter deficiency. Recent clinical studies have increased our knowledge concerning its use in children and in adult patient populations. Particularly, more long-term data and data on the combination of the artificial urinary sphincter with reconstructive techniques that utilize the bowel have become available. Some interesting new ideas regarding changes in the design of the artificial urinary sphincter have been advanced.

Adult↗
PubMed2000

Stent placement for renal arterial stenosis: where do we stand? A meta-analysis.

PURPOSE: To perform a meta-analysis of renal arterial stent placement in comparison with renal percutaneous transluminal angioplasty (PTA) in patients with renal arterial stenosis. MATERIALS AND METHODS: Studies dealing with renal arterial stent placement (14 articles; 678 patients) and renal PTA (10 articles; 644 patients) published up to August 1998 were selected. A random-effects model was used to pool the data. RESULTS: Renal arterial stent placement proved highly successful, with an initial adequate performance in 98% and major complications in 11%. The overall cure rate for hypertension was 20%, whereas hypertension was improved in 49%. Renal function improved in 30% and stabilized in 38% of patients. The restenosis rate at follow-up of 6-29 months was 17%. Stent placement had a higher technical success rate and a lower restenosis rate than did renal PTA (98% vs 77% and 17% vs 26%, respectively; P <.001). The complication rate was not different between the two treatments. The cure rate for hypertension was higher and the improvement rate for renal function was lower after stent placement than after renal PTA (20% vs 10% and 30% vs 38%, respectively; P <.001). CONCLUSION: Renal arterial stent placement is technically superior and clinically comparable to renal PTA alone.

Aged↗
PubMed2000

The artificial urinary sphincter in 86 patients with intrinsic sphincter deficiency: satisfactory actuarial adequate function rates.

OBJECTIVE: To evaluate the long-term results of the AMS-800 artificial urinary sphincter (AUS) in patients with incontinence due to intrinsic sphincter deficiency, taking into account the continence status and the durability of the device. PATIENTS AND METHODS: Between 1984 and 1997, an AUS was implanted in 86 patients. Kaplan-Meier survival analysis was used to determine the 'primary adequate function' rate (P-AF) and the 'additional procedure assisted adequate function' rate (APA-AF). These rates define adequate function as satisfactory continence (use of maximally 1 pad per 24 h) in combination with good AUS function. In the case of P-AF, no revisions have been required. In the case of APA-AF, one or more revisions of parts of the AUS are acceptable but a complete exchange or explantation of the AUS marks its endpoint. RESULTS: At last follow-up, satisfactory continence was found in 76% of the patients. Continence was markedly improved in another 7%. The 5-year P-AF and APA-AF rates were 46 and 67%, respectively. The 5-year P-AF rates for the periods before and after the introduction of the narrow backed cuff were 33 and 61%, respectively (p = 0.03). CONCLUSIONS: The AUS can give excellent results as far as urinary continence is concerned, but only at the expense of a considerable reoperation rate. The 5-year actuarial primary adequate function rate has almost doubled since the introduction of the narrow backed cuff design.

Actuarial Analysis↗
PubMed2000

Cost-effectiveness of percutaneous treatment of iliac artery occlusive disease in the United States.

OBJECTIVE: The costs of percutaneous transluminal angioplasty and stent placement for iliac artery occlusive disease in the United States were assessed and the cost-effectiveness was evaluated. MATERIALS AND METHODS: Lifetime costs and quality-adjusted life expectancy were estimated using a Markov decision model for a hypothetic cohort of patients with life-style-limiting claudication caused by an iliac artery stenosis for whom a percutaneous intervention was indicated. Various percutaneous treatment strategies were evaluated, each consisting of an initial intervention followed by a secondary intervention. Procedures considered were angioplasty alone and angioplasty with selective stent placement. RESULTS: From the perspective of the interventional radiology department, angioplasty with selective stent placement costs more than angioplasty alone ($2926 versus $2106). Taking into account follow-up costs and procedures for long-term failures, the cost differential was reduced because of a lower failure rate of selective stent placement ($13,158 versus $12,458, respectively). Treatment strategies using angioplasty with selective stent placement (as an initial procedure or including reintervention) dominated treatment strategies using angioplasty alone (incremental cost-effectiveness ratio was $7,624-8,519 per quality-adjusted life-year gained). CONCLUSION: Angioplasty with selective stent placement is a cost-effective treatment strategy compared with angioplasty alone in the treatment of intermittent claudication in the United States.

Angioplasty, Balloon↗
PubMed2000

Sacral nerve neuromodulation in the treatment of patients with refractory motor urge incontinence: long-term results of a prospective longitudinal study.

PURPOSE: Conservative treatment rarely results in a durable cure of patients with urge incontinence and bladder overactivity. Instrumental and surgical procedures often have significant side effects and less than optimal results. We developed a technique of sacral nerve neuromodulation using chronic unilateral electrical stimulation of the S3 sacral nerve to inhibit the micturition reflex to provide effective nondestructive alternative therapy for patients whose condition is refractory to conservative treatment. MATERIALS AND METHODS: Of 85 patients 45 who responded to a test with a temporary electrode underwent implantation of a permanent S3 sacral nerve electrode coupled to a pulse generator. Treatment results were evaluated by urodynamic studies and voiding/incontinence diaries documenting pad use, incontinence episodes, voiding frequency and voided volume. Partial success and cure were defined as 50% to 90% and more than 90% improvement, respectively, in pad use and/or incontinence episodes. RESULTS: Of 45 patients 18 (40%) were cured at an average followup of 47.1 months and 9 (20%) achieved partial success. Median number of pads used and median number of incontinence episodes daily had decreased from 5.4 to 1.2 (p = 0.0001) and 7.1 to 1.3 (p = 0.0001), respectively, 6 months after implantation. Subsequently these results remained almost constant for 5 years. Bladder overactivity disappeared in 19 of the 44 patients (43%). The repeat intervention rate was 37.7% and there was no permanent injury or nerve damage. CONCLUSIONS: Sacral nerve neuromodulation is safe, effective and durable in patients with urge incontinence refractory to conservative treatment.

Adolescent↗
PubMed1999

Health-related quality of life after angioplasty and stent placement in patients with iliac artery occlusive disease: results of a randomized controlled clinical trial. The Dutch Iliac Stent Trial Study Group.

BACKGROUND: To assess the quality of life in patients with iliac artery occlusive disease, we compared primary stent placement versus primary angioplasty followed by selective stent placement in a multicenter randomized controlled trial. METHODS AND RESULTS: Quality-of-life assessments were completed by 254 patients in a telephone interview. Assessment measures consisted of the RAND 36-Item Health Survey 1.0, time tradeoff, standard gamble, rating scale, health utilities index, and EuroQol-5D. The interviews were performed before treatment and after 1, 3, 12, and 24 months. When the 2 treatments were compared, no significant difference was observed (P>0.05). All measurements showed a significant improvement in the quality of life after treatment (P<0.05). The RAND 36-Item Health Survey measures physical functioning, role limitations caused by physical problems, and bodily pain and the EuroQol-5D were the most sensitive to the impact of revascularization. CONCLUSIONS: Health-related quality of life improves equally after primary stent placement and primary angioplasty with selective stent placement in the treatment of intermittent claudication caused by iliac artery occlusive disease.

Aged↗
PubMed1999

[Satisfactory long-term results with a sphincter prosthesis in patients with urinary incontinence due to an intrinsic urinary sphincter deficiency: evaluation of 86 patients].

OBJECTIVE: Evaluation of the results of treatment with an artificial urinary sphincter in 86 patients with urinary incontinence due to intrinsic sphincter deficiency. DESIGN: Retrospective. METHODS: In the period 1982-1997 an artificial urinary sphincter (American Medical Systems, Minnetonka, Minnesota, USA) was inserted in the Academic Hospital Rotterdam-Dijkzigt, Department of Urology, the Netherlands, in 86 patients (15 women and 71 men) aged 8-84 years. All patients suffered from urinary incontinence due to intrinsic sphincter deficiency. A 'good' result was defined as being completely dry or using a maximum of one pad per day. During follow-up visits, the pad counts were registered and the pumping characteristics of the prosthesis were checked. In case of deterioration of the continence status a re-evaluation was started using imaging modalities and urodynamic studies. RESULTS: After an average follow-up of 41 months 76% of the patients were either completely dry or used a maximum of one incontinence pad per day. Urinary continence had markedly improved in another 7% of the patients. One or more reoperations due to mechanical or non-mechanical problems with the prosthesis had to be performed in 37 patients (43%). CONCLUSION: The artificial urinary sphincter can give excellent results as far as urinary continence is concerned, if the price of a relatively large number of revisions is accepted, in a population of patients to whom, in most cases, no other treatment options apply.

Adolescent↗
PubMed1999

Testicular prostheses: body image and sexual functioning.

OBJECTIVES: To evaluate retrospectively the body image and sexual functioning in patients who have a testicular prosthesis (TP). PATIENTS AND METHODS: The medical charts were evaluated for 30 adult patients who received 32 TPs between 1985 and 1997. A questionnaire was mailed to each patient, asking about body image, satisfaction with the implant and with sexual functioning. RESULTS: Of the 30 patients, 22 (73%) replied; their mean (range) age was 30 (18-47) years. Most of the patients had a silicone gel-filled TP. No complications were reported in 25 (83%) patients and 80% reported no sexual problems; 20% felt uncomfortable in intimate contacts, 68% found their body image improved after having a TP, 58% were satisfied with their current sexual life, 90% had no erectile dysfunction and 45% reported premature ejaculation. CONCLUSIONS: Patients who have lost a testis for any reason should be informed about the availability of a TP. Prostheses were well accepted and no systemic disease was reported. Almost all patients reported an improvement in their body image. Sexual life and performance were apparently not compromised by having a TP. New surgical procedures are recommended to improve the cosmetic appearance of a TP in the scrotum.

Adult↗
PubMed1998

Randomised comparison of primary stent placement versus primary angioplasty followed by selective stent placement in patients with iliac-artery occlusive disease. Dutch Iliac Stent Trial Study Group.

BACKGROUND: Percutaneous transluminal angioplasty (PTA) is a safe, simple, and successful treatment for intermittent claudication caused by iliac-artery occlusive disease. Primary stent placement has been proposed as more effective than PTA. We compared the technical results and clinical outcomes of two treatment strategies-primary placement of a stent across the stenotic segment of the iliac artery, or primary PTA followed by selective stent placement when haemodynamic results were inadequate. METHODS: We randomly assigned 279 patients with intermittent claudication, recruited from departments of vascular surgery, either to direct stent placement (group I, n=143) or primary angioplasty (group II, n=136), with subsequent stent placement in case of a residual mean pressure gradient greater than 10 mm Hg across the treated site. The main inclusion criterion was intermittent claudication on the basis of iliac-artery stenosis of more than 50%, proven by angiography. All patients had a clinical assessment before intervention and at 3, 12, and 24 months. Clinical success was defined as improvement of at least one clinical category. Secondary endpoints were initial technical results, procedural complications, cumulative patency as assessed by duplex ultrasonography, and quality of life. FINDINGS: In group II, selective stent placement was done in 59 (43%) of the 136 patients. The mean follow-up was 9.3 months (range 3-24). Initial haemodynamic success and complication rates were 119 (81%) of 149 limbs and 6 (4%) of 143 limbs (group I) versus 103 (82%) of 126 limbs and 10 (7%) of 136 limbs (group II), respectively. Clinical success rates at 2 years were 29 (78%) of 37 patients and 26 (77%) of 34 patients in groups I and II, respectively (p=0.6); however, 43% and 35% of the patients, respectively, still had symptoms. Quality of life improved significantly after intervention (p<0.05) but we found no difference between the groups during follow-up. 2-year cumulative patency rates were similar at 71% versus 70% (p=0.2), respectively, as were reintervention rates at 7% versus 4%, respectively (95% CI -2% to 9%). INTERPRETATION: There were no substantial differences in technical results and clinical outcomes of the two treatment strategies both at short-term and long-term follow-up. Since angioplasty followed by selective stent placement is less expensive than direct placement of a stent, the former seems to be the treatment of choice for lifestyle-limiting intermittent claudication caused by iliac artery occlusive disease.

Adult↗
PubMed1998

Morbidity and quality of life in patients with orthotopic and heterotopic continent urinary diversion.

OBJECTIVES: To evaluate morbidity and quality of life (QOL) in patients with continent urinary diversion. METHODS: Morbidity and neobladder function were analyzed in 56 consecutive patients with bladder substitutions. QOL assessment was performed using the Sickness Impact Profile (SIP), supplemented with a detailed voiding and continence questionnaire. RESULTS: Mean age was 44.7 years. Mean follow-up was 41 months. Thirty-one men and 25 women were treated for transitional cell carcinoma (n = 22) or benign conditions (n = 34). In 33 patients, orthotopic (20 Mainz pouch and 13 ileal neobladder) substitutions were performed and in 23, heterotopic substitutions (Indiana pouch) were performed. Early complications required five open reinterventions. Late complications (at more than 3 months) included ureteric stenosis in 5 patients. In 38 patients (68%), full urinary continence was achieved. Spontaneous micturition was possible in 61% of orthotopic substitutions, whereas 15% of patients were required to perform intermittent catheterization only and 24% exhibited a combined voiding pattern. Compared to age-matched reference values, SIP scores showed a negative impact of heterotopic or orthotopic diversion in the SIP categories of emotion, recreation, and social interaction. The latter category included a statement about sexual activity, which was decreased in 50% of patients. In the category of emotion, orthotopic substitutions compared favorably to heterotopic substitutions (P = 0.02). CONCLUSIONS: The morbidity profile is comparable to previous reports. QOL assessment using the SIP revealed a minor advantage for an orthotopic placement which was due to a relatively small number of patients. Most importantly, QOL was found to be favorable for both types of bladder substitute placement.

Adolescent↗
PubMed1998

Neuromodulation: urodynamic effects of sacral (S3) spinal nerve stimulation in patients with detrusor instability or detrusor hyperflexia.

The aim of this study was to determine the urodynamic effects of sacral (S3) nerve stimulation in patients with urge incontinence due to detrusor overactivity which has been refractory to conservative treatment. A total of 24 patients with idiopathic detrusor instability and five with neurogenic hyperreflexia were studied urodynamically before and 6 months after a permanent S3 foramen electrode implant. The urodynamic studies at follow-up were done with the stimulus on. Clinically, the average voiding frequency, the number of leakage episodes and pad use per 24 h decreased significantly. Improvement in several urodynamic parameters was noted. In the idiopathic as well as in the neurogenic group, the correlation between symptomatic and urodynamic improvement was incomplete. Neuromodulation leads to improvement of several urodynamic parameters in patients with urge incontinence due to detrusor overactivity which has been refractory to conservative treatment and appears to be a valuable treatment option in these patients.

Adult↗
PubMed1998

The artificial urinary sphincter in men incontinent after radical prostatectomy: 5 year actuarial adequate function rates.

OBJECTIVE: To determine the success (as both continence and revision rates) of the artificial urinary sphincter (AUS) in men incontinent after radical prostatectomy, and thus improve the preoperative counselling provided for these patients. PATIENTS AND METHODS: The AUS was implanted in 27 men incontinent after radical prostatectomy (mean age 69 years, range 59-75) at a mean (range) interval of 20 (4-60) months after surgery. The Kaplan-Meier method of survival analysis was used to determine the 'primary adequate function' (PAF) rate and the 'additional procedure-assisted adequate function' (APA-AF) rate. Adequate function was defined as satisfactory continence (use of at most one pad per 24 h) in combination with good AUS function. PAF was defined when no revisions of the AUS were required and APA-AF when one or more revisions of one or more parts of the AUS were required; a complete exchange or explantation of the AUS defined failure, i.e. the end of APA-AF. RESULTS: At a mean follow-up of 35 months, 81% of the patients had achieved satisfactory continence. However, the 5 year PAF and APA-AF rates, based on the Kaplan-Meier curves, were 49% and 71%, respectively. CONCLUSIONS: Implantation of an AUS can provide excellent continence rates in patients incontinent after radical prostatectomy, but only at the expense of a considerable re-operation rate. The outcome is best represented by Kaplan-Meier curves of the PAF and the APA-AF.

Aged↗
PubMed1998

Diagnosis and grading of detrusor instability using a computerized algorithm.

PURPOSE: Detrusor instability and hyperreflexia are characterized by involuntary detrusor contractions in the filling phase of the voiding cycle. The diagnosis is made when urodynamic evaluation reveals such contractions. To compare patients and evaluate treatment a method is needed to quantify the degree of instability. We developed an instability parameter based on the area under the curve of involuntary detrusor contractions on conventional filling cystometry. MATERIALS AND METHODS: We developed an automatic method to calculate the area under the curve of involuntary detrusor contractions in conventional filling cystometry. Logistic regression was used to construct decision rules to differentiate stable from unstable bladders. These rules, derived from a group of 100 children, were applied to a second group of 77 who were independently assessed by 3 urodynamics experts. RESULTS: Typically 88% of the second group were correctly classified as stable or unstable by the automatic procedure. In the unstable subgroup there was poor correlation between the calculated instability parameter and the instability score assigned by the experts. Most likely this difference occurred because the experts based their opinion mainly on the amplitude of the highest unstable contraction and the percentage of filling time that instability was found. CONCLUSIONS: The proposed method of automatically grading detrusor instability based on the area under detrusor contractions differs from the intuitive method used by experts. Since no standard is available, it cannot be concluded which method is better. Our proposed method is objective and it results in a single physical value.

Algorithms↗
PubMed1998

Sacral neuromodulation in the treatment of the unstable bladder.

Sacral neuromodulation as a treatment for urge incontinence in patients with an unstable bladder is the subject of ongoing clinical studies. Although approximately 75% of the patients treated with a permanent sacral foramen electrode implant have experienced significant improvements, it is now also clear that there is an initial failure rate of about 25%. Recent studies have pointed out the importance of improved patient selection on the basis of sex differences, urodynamic parameters and psychological factors. Also, newer forms of test stimulation and permanent electrode implantation are being explored in an effort to improve on the present results.

Journal Article↗
PubMed1998

Iliac arterial occlusive disease: cost-effectiveness analysis of stent placement versus percutaneous transluminal angioplasty. Dutch Iliac Stent Trial Study Group.

PURPOSE: To evaluate the relative benefits and cost-effectiveness of treating iliac arterial occlusive disease with various interventions. MATERIALS AND METHODS: Cost-effectiveness was analyzed in a hypothetical cohort of patients with intermittent claudication caused by an iliac arterial stenosis. Primary stent placement, percutaneous transluminal angioplasty (PTA), and PTA with selective stent placement were analyzed. Reduction in the risk of failure after primary stent placement versus that after PTA with selective stent placement, quality of life, and cost data were derived from results of a randomized, controlled trail. Complication rates, patency results, and the reduction in risk of failure were derived from a published meta-analysis. RESULTS: PTA with selective stent placement yielded equivalent complication rates, patency results, and quality-of-life outcomes compared with those of primary stent placement, and the latter cost +957 less (95% confidence interval = +726, +1,188). PTA with selective stent placement was more expensive than PTA alone but yielded higher patency results (relative risk of long-term failure, 0.61; 95% confidence interval = 0.49, 0.75) and quality-adjusted life expectancy (0.2 quality-adjusted life year [QALY] gained) and had an incremental cost-effectiveness ratio of less than +20,000 per QALY gained. CONCLUSION: PTA with selective stent placement is a cost-effective treatment strategy compared with primary stent placement or PTA alone in the treatment of intermittent claudication caused by an iliac arterial stenosis.

Angioplasty, Balloon↗