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High-Throughput Proteomic and Glycoproteomic Analyses in Benign Prostatic Hyperplasia.

Benign prostatic hyperplasia (BPH) is a disease affecting the majority of aging men; 90% of men develop histological BPH by the time they reach their eighties. BPH can lead to bothersome lower urinary tract symptoms (LUTS), which may reduce quality of life. Many patients fail current treatment options and may progress to surgical intervention. Furthermore, diagnosis is reliant on symptom questionnaires and the cause of LUTS can be difficult to distinguish. Currently, BPH can only be definitively diagnosed through histological analysis of prostate tissue, which is not the standard of care. The resulting lack of clinical tissue samples is a major limitation in investigating disease pathology. Improved understanding of disease development and progression, along with objective biomarkers of disease, is needed for BPH. This investigation uses mass spectrometry (MS)-based proteomics and glycoproteomics to compare healthy prostate tissue with prostate tissue affected by BPH to address this gap in knowledge. By integrating proteomics and glycoproteomics, we identified 206 proteins and 44 glycopeptides that were significantly altered between BPH and control samples. These findings provide deeper insight into disease-associated pathways and may facilitate the identification of clinically relevant targets for further investigation.

Male

Electron microscopic stereological analysis of the normal human prostate and of benign prostatic hyperplasia.

Normal and benign hyperplastic prostatic tissue was studied by quantitative electron microscopic measurements. Quantitative morphological procedures provide values for volume, surface, number of tissue and cellular components within human prostatic tissue. When a comparison is made of the stereological data of the glandular cell of benign prostatic hyperplasia to that of the normal human prostate no statistically significant difference in the relative volumetric amount of the cell organelles is indicated. An attempt was made to characterize the fine structure of the smooth muscle cells of the stromal area (fibromuscular) in normal and benign hyperplastic prostatic tissue. In benign prostatic hyperplasia a significant increase in the relative amount of organelles in the smooth muscle cell was found, indicating an activation of these cells. Light microscopic analysis has revealed that benign prostatic hyperplasia is primarily a stromal disease.

Cytological Techniques

Light microscopic stereological analysis of the normal human prostate and of benign prostatic hyperplasia.

Normal prostate glands from 6 men less than 30 years old and enucleated tissue of benign prostatic hyperplasia were analyzed by stereological methods. Studies on the relative volumetric amount of fibromuscular (stromal) and glandular areas of the gland reveal no statistically significant difference between the inner and outer parts of the normal prostate and between the inner part of the normal prostate and benign prostatic hyperplasia. However, in benign prostatic hyperplasia there is a significant increase in the volumetric amount of the fibromuscular tissue and a decrease in the glandular area compared to the outer part of the normal prostate and the whole normal prostate (sum of the inner and the outer parts). These stereological data are discussed with respect to the pathogenesis of benign prostatic hyperplasia.

Adult

Measuring the quality of life of patients with benign prostatic hyperplasia. Assessment of the usefulness of a new quality of life questionnaire specially adapted to benign prostatic hyperplasia patients.

A questionnaire consisting of 36 questions based on a visual analogue scale for measuring the quality of life (QOL) of benign prostatic hyperplasia (BPH) patients is presented and assessed. The sensitivity of the questionnaire is demonstrated by its ability to register a statistically significant (p less than 0.01) improvement of QOL after prostate surgery (transurethral resection of the prostate). Its reliability is shown by its ability to give reproducible results in a nonoperated BPH patient group. Patient compliance has been excellent. It is discussed to what extent questions directly concerning symptoms from prostatism should be included in QOL questionnaires for BPH patients. Nonparametric statistics are applied. It is concluded that questionnaires like this are useful tools in the assessment of BPH patients, irrespective of the treatment modality. They will probably be of particular value in studies of drug therapy of BPH, complementing methods of assessment like symptom score and urodynamic parameters.

Humans

Rectal invasion by benign prostatic hyperplasia.

Rectal invasion by benign prostatic hyperplasia occurred subsequent to an open transrectal biopsy of the prostate gland. Frequent transrectal resections of the prostate controlled this unusual lesion initially. However, massive intrarectal regrowth of this clinically malignant but histologically proved benign prostatic enlargement required eventual pelvic exenteration.

Humans

Finasteride for benign prostatic hyperplasia.

The pathogenesis of benign prostatic hyperplasia is related to the action of 5 alpha-dihydrotestosterone (DHT), the physiologically active form of testosterone. The conversion of testosterone to DHT is catalyzed intracellularly in prostatic tissue by the enzyme 5 alpha-reductase. Finasteride blocks the action of 5 alpha-reductase by competitively inhibiting the binding of testosterone to 5 alpha-reductase. The maximum effect of finasteride on reducing prostatic volume occurs after three months of oral therapy. Most patients experience improvement in urine flow rates, and side effects are minimal. However, following discontinuation of treatment, serum DHT levels return to baseline within two weeks.

5-alpha Reductase Inhibitors

A randomized, placebo-controlled multicenter study of the efficacy and safety of terazosin in the treatment of benign prostatic hyperplasia.

The clinical manifestations of benign prostatic hyperplasia (BPH) are related primarily to bladder outlet obstruction resulting from enlargement of the prostate gland. Transurethral prostatectomy is the most common treatment currently offered for BPH in the United States. The primary objective of the present randomized placebo controlled multicenter study was to determine the efficacy and safety of terazosin, a selective long-acting alpha 1-blocker, for the treatment of symptomatic BPH. A total of 285 men with symptomatic BPH was randomly assigned in equal proportions to receive placebo, or 2, 5 or 10 mg. terazosin administered once daily. Of the patients 237 completed the 4-week single-blind placebo lead-in and 12-week double-blind treatment periods. The primary outcome parameters were changes in peak and mean urinary flow rates, and changes in the Boyarsky symptom scores. All terazosin treatment groups exhibited significantly greater decreases in total Boyarsky symptom score than the placebo group. The 10 mg. terazosin group exhibited significantly greater increases in peak and mean urinary flow rates than the placebo group. The improvements in symptom scores and urinary flow rates did not reach a plateau within the dose range evaluated, suggesting that further efficacy may be achieved with doses of terazosin exceeding 10 mg. This study unequivocally demonstrates the safety and efficacy of terazosin for the treatment of BPH. Selective alpha 1-blockade is likely to gain widespread acceptance for the treatment of BPH due to its safety and efficacy.

Adrenergic alpha-Antagonists

Benign prostatic hyperplasia: drug and nondrug therapies.

Benign prostatic hyperplasia (BPH) is a frequent finding in older men. Patients with symptoms have traditionally been treated with transurethral resection of the prostate, a surgical technique that effectively reduces infravesical obstruction. Nonsurgical management of BPH also has the potential to play an important role in the treatment of patients with moderate or severe symptoms or in those who do not elect surgery. Data are being evaluated to determine the efficacy of treating symptomatic BPH with such modalities as balloon dilation, prostate hyperthermia, androgen suppression, the 5-alpha reductase inhibitor finasteride, and selective alpha blockers.

5-alpha Reductase Inhibitors

Benign prostatic hyperplasia: appearance on magnetic resonance imaging.

Benign prostatic hyperplasia (BPH) has a variable appearance on magnetic resonance imaging (MRI). This study reviews and categorizes the MRI findings of this entity in a sample of 26 men. Cases where atypical or suspicious changes are incidental findings should be reported to the urologist for further investigation. In addition, familiarity with both the appearance of the normal prostate and the changes caused by BPH is necessary when staging patients with known prostate cancer.

Humans

Future directions in the management of benign prostatic hyperplasia.

A meeting of the International Consultation on Benign Prostatic Hyperplasia (BPH) in June 1991 provided an update on the management of PBH. It is recognised that the development of complications in what may be regarded as a relatively well tolerated disease may necessitate surgical intervention. Current treatment is directed towards circumventing or ameliorating the complications of BPH and perhaps to find minimally invasive or non-invasive alternatives to surgery that could eliminate this modality altogether. Anticipated changes in the management of BPH include establishment of an improved scoring system and response criteria; implementation of stenting techniques, physical modalities such as hyperthermia and laser therapy to replace transurethral resection of the prostate; development of more specific alpha blockers with fewer adverse effects; and administration of hormonal therapy, possibly as an eventual preventative of BPH. The 1991 International Consultation on Benign Prostatic Hyperplasia (BPH), which took place in Paris, France, under the joint sponsorship or the World Health Organization and the major international and national societies of urology, provided an excellent opportunity to review current knowledge on the subject of BPH and to explore future trends in its management. Most of the information included in this report is drawn from the conclusions of the consultation participants.

Adrenergic alpha-Antagonists

Holmium laser enucleation of the prostate for the treatment of lower urinary tract symptoms in men with benign prostatic hyperplasia.

RATIONALE: A range of surgical options is available for the treatment of benign prostatic hyperplasia (BPH), including holmium laser enucleation of the prostate (HoLEP). The evidence is unclear regarding differences in functional, perioperative, and morbidity outcomes between these modalities. OBJECTIVES: To assess the effects of holmium laser enucleation of the prostate compared with other surgical treatments for lower urinary tract symptoms in men with benign prostatic hyperplasia. SEARCH METHODS: We searched multiple databases (including MEDLINE, Embase, CENTRAL, Web of Science, LILACS, and the International HTA database), trial registries, and conference abstracts through April 08, 2026. ELIGIBILITY CRITERIA: We only included randomized trials of men over 40 years of age with a prostate volume of at least 20 mL (assessed by digital rectal examination, ultrasound, or conventional imaging) who exhibited lower urinary tract symptoms (LUTS) defined by an International Prostate Symptom Score (IPSS) of eight or greater undergoing surgical interventions for BPH. OUTCOMES: The critical outcomes measured were the urologic symptoms score, the quality-of-life score, and major adverse events. The important outcomes measured were: re-treatment, erectile function, ejaculatory function, transfusions, acute urinary retention, indwelling urinary catheter duration, and hospital stay duration. RISK OF BIAS: We used the Cochrane risk of bias tool (RoB 1) to assess for potential sources of bias on a study and outcome level basis. SYNTHESIS METHODS: We pooled outcome data using the random-effects model and performed meta-analyses using the Mantel-Haenszel method. We assessed statistical heterogeneity in the pooled data by visually inspecting forest plots and using the I2 statistic to quantify it. We used the GRADE framework to assess the certainty of evidence. INCLUDED STUDIES: We included 52 trials that included 6242 participants that compared HoLEP to other surgical interventions for benign prostatic hyperplasia. The median age of participants across the studies ranged from 65 to 74 years. The baseline prostate volume ranged from 30 cc to 142 cc. Baseline IPSS scores ranged from 19.6 to 28.6 (range 0-35). SYNTHESIS OF RESULTS: We prioritized comparing HoLEP with transurethral resection of the prostate (TURP) at short-term follow-up (up to 12 months), because TURP is the long-standing reference standard and the predominant comparator in randomized surgical trials. Findings for the four remaining comparisons (laser ablation, alternative energy source enucleation, other minimally invasive therapies, and simple prostatectomy), for long-term follow-up, and for all remaining outcomes are reported in full in the review. Compared to TURP, at short-term follow-up: Critical outcomes - HoLEP may result in little to no difference in short-term urologic symptom scores measured using the IPSS (range 0 to 35; lower values reflect fewer symptoms) (MD -0.67, 95% CI -1.20 to -0.14; I² = 93%; 14 studies, 1666 participants, low-certainty evidence). - HoLEP may result in little to no difference in short-term quality of life (range 0 to 6; lower values reflect better quality of life) (MD -0.04, 95% CI -0.23 to 0.15; I² = 73%; 6 studies, 876 participants, low-certainty evidence). - HoLEP may result in little to no difference in short-term major adverse events (RR 0.75, 95% CI 0.35 to 1.58; I² = 0%; 10 studies, 1147 participants, low-certainty evidence). Important outcomes - HoLEP likely results in little to no difference in re-treatment (RR 0.45, 95% CI 0.14 to 1.50; I² = 0%; 8 studies, 813 participants, moderate-certainty evidence). - HoLEP likely results in little to no difference in erectile function (MD -0.03, 95% CI -0.47 to 0.42; I² = 0%; 3 studies, 518 participants, moderate-certainty evidence). - Ejaculatory function: we did not find any data for this outcome. - HoLEP likely reduces the need for blood transfusion (RR 0.19, 95% CI 0.09 to 0.42; I² = 0%; 15 studies, 1755 participants, moderate-certainty evidence). AUTHORS' CONCLUSIONS: Compared with TURP, HoLEP may achieve similar relief of urologic symptoms, similar quality of life, and similar rates of major adverse events in the first 12 months after surgery, and probably similar re-treatment rates and erectile function. HoLEP likely reduces the need for blood transfusion; this is the only advantage of HoLEP that the randomized evidence, as summarized here, supports as clinically important. There was insufficient evidence to assess outcomes in the subset of individuals with larger prostates or on anticoagulation. Future research should prioritize long-term trials reporting sexual function and urinary incontinence outcomes, recruit men with very large prostates (≥ 150 cc) or on anticoagulation therapy, and evaluate cost-effectiveness and training requirements. FUNDING: No external funding was received for this review. REGISTRATION: The protocol for this review was published in the Cochrane Database 2019 (https://doi.org/10.1002/14651858.CD013291).

Humans

Benign prostatic hyperplasia in a squirrel monkey (Saimiri sciureus).

Benign prostatic hyperplasia was diagnosed at necropsy in a middle-aged squirrel monkey (Saimiri sciureus). Grossly, the prostate gland was asymmetrically enlarged and had an irregular surface. Microscopically, both cystic glandular hyperplasia and fibromuscular, nodular hyperplasia were identified.

Animals

Demonstration of a progestin receptor in human benign prostatic hyperplasia and prostatic carcinoma.

Cytosol from human benign hyperplastic and carcinomatous prostatic tissue has been shown to contain a progestin receptor with a dissociation constant of approximately 10(-9) M. The receptor was measured using 3H-labeled R 5020 (17 alpha, 21-dimethyl-19-nor-4,9-pregnadiene-3,20-dione) as ligand. Progesterone, cyproterone acetate, and R 1881 (methyltrienolone) were efficient competitors to R 5020 for binding sites on the receptor whereas testosterone, 5 alpha--dihydrotestosterone, estradiol, cortisol, and several hydroxylated and saturated derivatives of progesterone did not compete. The [3H]R 2020-receptor-complex had a sedimentation coefficient of approximately 4 S, an isoelectric point of approximately 5, was heat-labile, and was destroyed by treatment with trypsin but not with deoxyribonuclease or ribonuclease. Seventeen of 21 patients with benign prostatic hyperplasia and three patients with prostatic carcinoma had 1 to 40 fmoles of specific R 5020-binding sites per mg of cytosol protein. One sample of normal prostatic tissue did not contain significant amounts of progesting receptor. Tissue specimens removed by transvesical adenoma enucleation displayed a larger number of specific R 5020-binding sites than electroresected specimens. The progestin receptor in hyperplastic prostate may be involved in the mechanism of the action of progestins used in the medical treatment of benign prostatic hyperplasia. Quantitation of progestin receptor in cancer of the prostate may form part of the basis of a predictive test program for endocrine therapy of prostatic malignancy.

Aged

Role of preoperative urography in benign prostatic hyperplasia.

The excretory urograms of 184 consecutive patients admitted to hospital with a diagnosis of benign prostatic hyperplasia who subsequently underwent prostatectomy were reviewed to determine the usefulness of preoperative urography. Of 184 urograms reviewed, 10 were normal, 136 showed changes consistent with benign prostatic hyperplasia, and 38 revealed other abnormalities. Twenty-seven of 184 urograms (14.7 per cent) revealed significant pathologic conditions requiring further consideration, investigation, or treatment, of which 23 would not have been suspected without this radiologic examination.

Humans

A possible role of decreased relaxation mediated by beta-adrenoceptors in bladder outlet obstruction by benign prostatic hyperplasia.

1. To explore mechanisms of urinary obstruction in benign prostatic hyperplasia (BPH), the features of contraction and relaxation in human hyperplastic and non-hyperplastic (control) prostatic tissues were investigated for beta- and alpha 1-adrenoceptors by radioligand binding and in vitro isometric tension experiments. 2. Hyperplastic and control prostatic tissues had a similar number (per mg protein) of prazosin binding sites with similar affinities. Noradrenaline (NA) induced dose-dependent contraction in both tissues. Contraction induced by either exogenous NA or transmural stimulation was inhibited by prazosin in both tissues, indicating that the same contractile mechanisms mediated by alpha 1-adrenoceptors exist in hyperplastic and control tissues. 3. The number of dihydroalprenolol (DHA) binding sites (per mg protein) was less in hyperplastic tissues than in controls, whereas the affinity to the ligand was identical in both tissues. Isoprenaline caused a marked relaxation of the tonic contraction induced by KCl in control tissues, but not in hyperplastic tissues. Propranolol enhanced exogenous NA- or transmural stimulation-induced contraction more in control tissues than in hyperplastic tissues. Both tissues, however, similarly responded to forskolin by relaxation. 4. These results indicate that decreased beta-adrenoceptor-mediated relaxation in hyperplastic prostatic tissues, which is attributable at least in part to the decreased number of beta-adrenoceptors, may play a role in the urinary obstruction of BPH in addition to mechanical compression of the urethra by the enlarged prostate.

Adult

[A single session of transurethral microwave thermotherapy for benign prostatic hyperplasia].

A single session of transurethral microwave thermotherapy using Prostatron (Technomed International, France) was performed in 20 patients with benign prostatic hyperplasia, and the clinical efficacy of this modality was evaluated by analysing the subjective and objective responses following the treatment. 1,296 MHz microwaves are delivered to the prostate by an antenna placed in a 20 Fr urethral balloon catheter equipped with a cooling system for preservation of the urethral mucosa. The treatment was performed in a single session for an hour on an outpatient basis. The clinical efficacy was evaluated by a total score of subjective symptoms and objective findings including residual urine and average flow rate, 8 weeks after the treatment. Reduction of subjective symptom score was observed in 26 cases (86.7%), and that of objective findings in 21 (70%). When 25% or more decrease of the total score was defined as good, the overall good result including subjective and objective responses was seen in 24 cases (80%). During the treatment and follow-up period, no severe adverse effect was detected. In conclusion, a single session of thermotherapy by Prostatron is a safe and useful modality as a non-surgical treatment performed on an outpatient basis for benign prostatic hyperplasia.

Aged

Conservative treatment of benign prostatic hyperplasia.

A study was carried out in 30 male patients with benign prostate hyperplasia to assess the effectiveness of treatment with a progestational agent, gestonorone caproate (200 mg), given intramucularly every 7 days over a period of 2 to 3 months. The results showed definite subjective and objective improvement after treatment. Residual urine determination diminished significantly after therapy in 78% of the cases completing the study; uroflometry also showed improvement. There appeared to be some reduction in the degree of occlusion of the urethral lumen in at least 13(65%) out of 20 patients given follow-up cystopanendoscopy after 6 months. This result was further supported by improvement in urinary flow rates and uroflometrograms in the same patients. The only adverse effect of treatment noted was the development of impotency in 21 patients.

Aged

Validation of a new quality of life questionnaire for benign prostatic hyperplasia.

In planning a longitudinal study to characterize the natural history of benign prostatic hyperplasia (BPH), we validated a new disease-specific quality of life questionnaire in a pilot study. We studied 110 men in Rochester, Minnesota who spanned the severity of BPH, from men with no known BPH to men who underwent surgery for this condition. Baseline data were obtained on all men, and the 30 who underwent prostatectomy were re-interviewed to test responsiveness. Reproducibility was examined on the pre-post responses (10 weeks apart) of the 37 men with BPH who did not undergo prostatectomy. Six of twelve question domains were retained in the final questionnaire on the basis of their responsiveness to change, reproducibility, internal consistency, and validity. These were: urinary symptoms, degree of bother due to urinary symptoms, BPH-specific interference with activities, general psychological well-being, worries and concerns, and sexual satisfaction. Most of the more generic measures were deleted.

Adult