Effects of doxazosin in men with benign prostatic hyperplasia: urodynamic assessment

Two-year follow up of silodosin on lower urinary tract functions and symptoms in patients with benign prostatic hyperplasia based on prostate size: a prospective investigation using urodynamics

Background

The aim of this research was to investigate intermediate-term effects of silodosin on lower urinary tract functions and symptoms in patients with lower urinary tract symptoms (LUTS) due to benign prostatic hyperplasia (BPH) according to prostate size, using urodynamics.

Methods

A total of 70 untreated outpatients with a prostate volume <40 ml [small prostate (SP) group] and 70 with prostate volume ⩾40 ml [large prostate (LP) group] were prospectively enrolled and treated by monotherapy with silodosin for 24 months. Changes in parameters from baseline to 3 months and 24 months after silodosin administration were assessed based on LUTS, voiding and storage function. In addition, withdrawal rates of silodosin due to insufficient effects were compared between the two groups and factors to influence the withdrawal were investigated.

Results

The International Prostate Symptom Score (IPSS), bladder outlet obstruction index (BOOI), and detrusor overactivity (DO) improved significantly for the 2-year follow up in both groups as compared with the baseline. IPSS, BOOI and DO improved by 40.4%, 41.3%, and 48.1% in the SP group, 32.7%, 35.9%, and 34.4% in the LP group at 3 months, while, 44.3%, 43.5%, and 63.0% in the SP group, 22.6%, 21.1%, and 34.4% in the LP group at 24 months, respectively. Improvement rates in the IPSS and BOOI at 3 months were maintained until 24 months in the SP group, but decreased in the LP group. Storage function improvements continued in both groups for 2 years. Dropout rate due to unsatisfactory effects was significantly higher in the LP group (20% versus 8.6%). Maximum flow rate, BOOI, and intravesical prostatic protrusion had a significant influence on the withdrawal of silodosin treatment in the LP group.

Conclusions

Silodosin significantly improved lower urinary tract functions for 2 years in patients with LUTS/BPH, regardless of prostate size. However, LUTS and BOO improvements tended to decrease in patients with a large prostate (>40 ml) in the intermediate term.

Benign Prostatic Obstruction Relief in Patients with Lower Urinary Tract Symptoms Suggestive of Benign Prostatic Enlargement Undergoing Endoscopic Surgical Procedures or Therapy with Alpha-Blockers: A Review of Urodynamic Studies

Benign prostatic obstruction (BPO) contributes to the genesis of lower urinary tract symptoms as well as to pathologic remodeling of the lower and upper urinary tract in patients with benign prostate enlargement. Urodynamic studies demonstrate that both medical therapy with alpha-blockers (ABs) and endoscopic surgical procedures provide BPO relief. However, the magnitude of improvement is higher after surgery. Among ABs, silodosin is associated with the highest improvement of bladder outlet obstruction index (BOOI). A complex relationship exists between BOOI improvement and variations of both maximum urinary flow (Q _max) and detrusor pressure. When the reduction of BOOI is small, the improvement of Q _max is clinically irrelevant and the BOOI is mainly influenced by a decrease of detrusor pressure. In contrast, when the magnitude of BOOI reduction is robust, a meaningful improvement of both detrusor pressure and urinary flow is evident. When clustering ABs according to their receptor pharmacologic selectivity and urodynamic efficacy, three subgroups can be identified,with silodosin being the only member of a subgroup characterized by the highest levels of BOOI improvement and α-1A/α-1B receptor affinity ratio.

[S2e guideline of the German urologists: Conservative and pharmacologic treatment of benign prostatic hyperplasia]

This report summarizes the relevant aspects of the S2e guideline of the German Urologists for the conservative and pharmacological treatment of lower urinary tract symptoms due to benign prostatic hyperplasia. Recommendations are given regarding watchful waiting, behavioral therapy, phytotherapy and pharmacological mono- and combination therapy. The influence of the different therapeutic options on bladder outlet obstruction (BOO) is described in detail.

Comparative effectiveness of oral drug therapies for lower urinary tract symptoms due to benign prostatic hyperplasia: a systematic review and network meta-analysis

INTRODUCTION

Lower urinary tract symptoms (LUTS) due to benign prostatic hyperplasia (BPH) are common in elder men and a number of drugs alone or combined are clinically used for this disorder. But available studies investigating the comparative effects of different drug therapies are limited. This study was aimed to compare the efficacy of different drug therapies for LUTS/BPH with network meta-analysis.

MATERIALS AND METHODS

An electronic search of PubMed, Cochrane Library and Embase was performed to identify randomized controlled trials (RCTs) comparing different drug therapies for LUTS/BPH within 24 weeks. Comparative effects were calculated using Aggregate Data Drug Information System. Consistency models of network meta-analysis were created and cumulative probability was used to rank different therapies.

RESULTS

A total 66 RCTs covering seven different therapies with 29384 participants were included. We found that α-blockers (ABs) plus phosphodiesterase 5 inhibitors (PDE5-Is) ranked highest in the test of IPSS total score, storage subscore and voiding subscore. The combination therapy of ABs plus 5α-reductase inhibitors was the best for increasing maximum urinary flow rate (Qmax) with a mean difference (MD) of 1.98 (95% CI, 1.12 to 2.86) as compared to placebo. ABs plus muscarinic receptor antagonists (MRAs) ranked secondly on the reduction of IPSS storage subscore, although monotherapies including MRAs showed no effect on this aspect. Additionally, PDE5-Is alone showed great effectiveness for LUTS/BPH except Qmax.

CONCLUSIONS

Based on our novel findings, combination therapy, especially ABs plus PDE5-Is, is recommended for short-term treatment for LUTS/BPH. There was also evidence that PDE5-Is used alone was efficacious except on Qmax. Additionally, it should be cautious when using MRAs. However, further clinical studies are required for longer duration which considers more treatment outcomes such as disease progression, as well as basic research investigating mechanisms involving PDE5-Is and other pharmacologic agents alleviate the symptoms of LUTS/BPH.

What are the factors contributing to failure in improvement of subjective symptoms following silodosin administration in patients with benign prostatic hyperplasia? Investigation using a pressure-flow study

AIMS

To investigate the factors responsible for failure in improvement of subjective symptoms following silodosin treatment on the basis of findings of a pressure-flow study (PFS).

METHODS

A post hoc analysis of a prospective study to investigate the efficacy of silodosin in patients with BPH was conducted, and 104 patients were analyzed. The patients were administered silodosin 8 mg/day for 4 weeks. At the baseline and after treatment, subjective symptoms were evaluated using the IPSS and OABSS. A PFS was conducted to measure storage and voiding function. The patients were divided into two groups: good responders (GR), patients with 25% or more improvement in IPSS, and poor responders (PR), <25% improvement. The clinical and objective findings for the two groups were compared.

RESULTS

The mean IPSS and OABSS significantly improved in GR, but no significant improvement was observed in PR. PFS analysis revealed that all voiding and storage function parameters improved significantly in GR. Although PR showed a significant improvement in the voiding function parameters, it did not show significant changes in the storage function. Involuntary detrusor contraction (IDC) resolved in 68.6% of the patients in GR and in only 30% of the patients in PR, thereby showing a significant difference in the remedial effect between the two groups.

CONCLUSIONS

The findings suggest that insufficient improvement in storage function is a contributing factor to the failure in improvement of subjective symptoms after silodosin treatment in patients with BPH.