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Kohn TP, Rajanahally S, Hellstrom WJG, Hsieh TC, Raheem OA. Global Trends in Prevalence, Treatments, and Costs of Penile Prosthesis for Erectile Dysfunction in Men. Eur Urol Focus 2021; 8:803-813. [PMID: 34034995 DOI: 10.1016/j.euf.2021.05.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 04/26/2021] [Accepted: 05/12/2021] [Indexed: 11/04/2022]
Abstract
CONTEXT Penile prosthesis is a durable and effective treatment for erectile dysfunction (ED). Even as other treatment options for ED have been brought to market, penile prosthetic surgery remains a mainstay for urologists treating ED. No systematic study has yet summarized the global trends in penile prosthetic surgery. OBJECTIVE To systematically review studies of trends in penile prosthetic surgery to determine global movements in implantation rates, malleable versus inflatable prosthetic surgery, inpatient versus outpatient implantation surgery, proportion of men with ED undergoing penile prosthetic surgery, and prosthetic cost. EVIDENCE ACQUISITION A systematic review of MEDLINE, EMBASE, Cochrane Library, and ClinicalTrials.gov was performed for studies assessing trends in penile prosthetic surgeries and costs associated with penile prosthetic device and inclusive surgical costs. EVIDENCE SYNTHESIS Twenty-seven studies were identified during the systematic review, comprising 447,204 penile prosthetic surgeries reported from 1988 to 2019. A trend analysis demonstrates that rates of penile prosthetic surgery declined dramatically in the late 1980s and early 1990s, but have demonstrated modest growth since the mid-2000s. Outpatient inflatable penile prosthetic surgery has strongly trended upward. Costs of penile prosthetic device have matched the rate of inflation, but inclusive surgical cost has radically outpaced inflation. Growth has mainly been seen in the USA, with a more modest global growth. CONCLUSIONS Penile prosthesis remains a viable option for the treatment of ED. Trends such as outpatient surgery and inflatable penile prosthesis placement may be driving the recent steady growth of penile prosthetic surgeries, but surging inclusive surgical cost may present a barrier for some patients without insurance coverage. PATIENT SUMMARY Penile prostheses continue to be an important treatment for erectile dysfunction. While the volume of penile prosthetic surgeries dropped when phosphidiesterase-5 inhibitors became available, prosthetic surgery is becoming more patient centric, as seen by increases in inflatable prosthetic placement and outpatient surgery.
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Affiliation(s)
- Taylor P Kohn
- Department of Urology, Johns Hopkins, Baltimore, MD, USA
| | | | - Wayne J G Hellstrom
- Department of Urology, Tulane University School of Medicine, New Orleans, LA, USA
| | - Tung-Chin Hsieh
- Department of Urology, University of California, San Diego, La Jolla, CA, USA
| | - Omer A Raheem
- Department of Urology, Tulane University School of Medicine, New Orleans, LA, USA.
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Fleck-Lavergne D, Marconi M, Mercado-Campero A, Hidalgo JP, Marchant F, Palma-Ceppi C. [Penile prostheses: Description of a series of implants with and without dilatation of the corpora cavernosa]. Rev Int Androl 2019; 19:16-24. [PMID: 31780332 DOI: 10.1016/j.androl.2019.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/13/2019] [Accepted: 07/05/2019] [Indexed: 11/15/2022]
Abstract
INTRODUCTION Penile prosthesis (PP) implantation is the treatment of choice for refractory erectile dysfunction (ED). They show a high satisfaction rate (75%-100%) and a complication rate that varies between 2.1% and 28.8%. The standard surgical technique includes dilatation of the corpora cavernosa (CC) prior to the insertion of the cylinders. This step takes time and is critical for the occurrence of complications. The aim of this study is to describe the results of a series of PP implanted using the techniques with and without dilatation of the CC. MATERIALS AND METHODS One-hundred and 20 patients with refractory ED in whom a PP was implanted by 2 surgeons in different centers. Comorbidities, operative characteristics, satisfaction and postoperative complications were evaluated. RESULTS The average age was 61±9.6 years. The most prevalent comorbidities were: history of radical prostatectomy, high-blood pressure and diabetes mellitus. Forty-two malleable and 78 hydraulic prostheses were implanted. Eleven patients had a previous PP. The median operative time was 70minutes (35-140). The satisfaction reported was 95.8%. Ten patients presented complications. In the group in which the surgery was performed without dilatation of the CC (n=80), the operative time was shorter (62.5minutes [35-105] versus 90minutes [60-140] respectively, p<0.0001). There was no difference in complications (p=0.73) or levels of satisfaction (p=0.196) when comparing the technique with and without dilatation of the CC. CONCLUSION In our series, a shorter operative time was observed with the technique without dilatation of the CC, but there were no differences in complications. A prospective and randomized study is required to make a stronger recommendation regarding to dilatation of the CC.
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Affiliation(s)
| | - Marcelo Marconi
- Unidad de Andrología, Departamento de Urología, Pontificia Universidad Católica de Chile, Santiago, Región Metropolitana, Chile
| | - Alejandro Mercado-Campero
- Servicio de Urología, Hospital Clínico Universidad de Chile, Santiago, Región Metropolitana, Chile; Departamento de Urología, Clínica Las Condes, Santiago, Región Metropolitana, Chile
| | - Juan Pablo Hidalgo
- Servicio de Urología, Hospital Clínico Universidad de Chile, Santiago, Región Metropolitana, Chile
| | - Fernando Marchant
- Servicio de Urología, Hospital Clínico Universidad de Chile, Santiago, Región Metropolitana, Chile; Departamento de Urología, Clínica Las Condes, Santiago, Región Metropolitana, Chile
| | - Cristián Palma-Ceppi
- Servicio de Urología, Hospital Clínico Universidad de Chile, Santiago, Región Metropolitana, Chile; Departamento de Urología, Clínica Las Condes, Santiago, Región Metropolitana, Chile
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Negro CLA, Paradiso M, Rocca A, Bardari F. Implantation of AMS 700 LGX penile prosthesis preserves penile length without the need for penile lengthening procedures. Asian J Androl 2016; 18:114-7. [PMID: 26112480 PMCID: PMC4736338 DOI: 10.4103/1008-682x.154311] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Implantation of an inflatable penile prosthesis (IPP) is a well-established definitive solution for erectile dysfunction when conservative treatments fail. Penile implants may shorten the penis. The AMS 700 LGX IPP is in common use but reports on its mechanical reliability, medium-term postsurgical patient satisfaction, and mean penile length preservation are lacking. We investigate the mean penile length, mechanical reliability, and patient satisfaction at 6 and 12 months after implantation of the AMS 700 LGX. This prospective study consecutively enrolled men undergoing first-time IPP implant surgery from February 2009 to April 2012. Stretched flaccid penile length, penile length at 50% and 100% of stiffness (P50 and P100) and International Index of Erectile Function (IIEF) and Erectile Dysfunction Inventory of Treatment Satisfaction (EDITS) scores, were measured at 6 and 12 months postsurgery. Of 45 patients who underwent AMS 700 LGX implantation (median age 61 years) and completed 6 months’ follow-up, 36 (80%) completed the study. A significant difference in stretched flaccid penile length was seen between 6 and 12 months (P = 0.033). P100 was also significantly increased at 6 and 12 months, with a mean 10% increase (1.3 ± 0.4 cm) from baseline to 12 months. Differences in mean IIEF scores at 6 and 12 months were significant for the desired domain (P = 0.0001) and for overall satisfaction (P = 0.002); however, mean EDITS scores at 6 and 12 months were not significantly improved. AMS 700 LGX is a powerful tool for preserving penile length in men undergoing penile prosthesis implantation.
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Penile Prosthesis Surgery: Current Recommendations From the International Consultation on Sexual Medicine. J Sex Med 2016; 13:489-518. [PMID: 27045255 DOI: 10.1016/j.jsxm.2016.01.017] [Citation(s) in RCA: 146] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/26/2016] [Accepted: 01/27/2016] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Penile prosthesis implantation has emerged as a definitive treatment to restore sexual function to the motivated man with erectile dysfunction. Substantial improvements in the design of inflatable devices have been made since they first became available more than four decades ago. AIM To review the history of the penile prosthesis, the indications, preoperative evaluation, and patient and partner satisfaction. The current approaches to addressing intra- and postoperative complications, provide an understanding of prosthesis infection, and placement of these devices will be reviewed. METHODS A committee of worldwide experts in this field was assembled during the 2015 International Consultation on Sexual Medicine (ICSM) and performed a systematic review of the peer-reviewed published medical literature pertaining to penile prosthesis. Particular attention was given to higher level trials when available. Recommendations are based upon the Oxford Criteria. MAIN OUTCOME MEASURES Unfortunately there is limited level 1 and 2 evidence, and where expert opinion was utilized, the decision was unanimous within the committee with a goal of presenting a clinically relevant guideline pertaining to penile prostheses. RESULTS Penile prosthesis has undergone an evolution over the past 40 years resulting in a more effective and reliable treatment for advanced erectile dysfunction not responding to less invasive methods including oral treatment with PDE5 inhibitors, vacuum erection device, and intracorporal injection therapy. It should be considered an appropriate treatment option for the man who wishes to restore erectile function and who understands the potential risk of mechanical failure and infection, both of which are less common now as a result of improvements made in device design as well as surgical protocols adhered to in the operating room. Patients must be clearly informed of the risks associated with penile prosthesis including mechanical failure, infection, shortening of the penis, change in sensation and configuration of the penis, as well as injury to local structures. Intraoperative complications are unusual but do occur and can usually be addressed intraoperatively to allow placement of the device at the time of initial surgery. Postoperative complications may also be addressed when they occur but may require more advanced reconstructive surgical techniques. Men with Peyronie's disease, corporal fibrosis due to infection, trauma, prior prosthesis explantation, priapism, and men who have undergone construction of a neophallus may require additional advanced maneuvers to obtain optimum results with a penile prosthesis. CONCLUSION Penile prosthesis remains as an important, viable, and effective treatment for male erectile dysfunction that does not respond to other less invasive approaches or when these approaches are contraindicated or not acceptable to the patient. These devices provide the patient with the ability to engage in penetrative sexual activity without interfering with urination, ejaculation, sensation, or orgasm. Although mechanical failure can occur, the current devices are more reliable as a result of design modifications. Infection remains the most dreaded complication but since the introduction of antibiotic and hydrophilic coatings, infection is less common. Overall, patient and partner satisfaction appear to be reasonably high when a penile prosthesis is used to restore erectile function.
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Kalejaiye O, Parsons BA, Pearcy R. Sex: the new postcode lottery. JOURNAL OF CLINICAL UROLOGY 2014. [DOI: 10.1177/2051415813514577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: A list of all the Primary Care Trusts (PCTs) in England, Scotland and Wales was obtained from the websites of National Health Service (NHS) choices’, NHS Scotland and NHS Wales. Methods: Each PCT’s website was visited to find the email address for their Freedom of Information (FOI) department. FOI requests were made to each PCT asking questions regarding their criteria for funding and the number of requests made and implants funded in the previous 12 months. Results: A total of 129 PCTs were emailed with a 95% response rate. Thirty-one per cent of the PCTs that replied funded penile prostheses and 22% did not. A further 45% of PCTs would fund under exceptional circumstances, but only 20% of these had any clinical criteria on which to base their decision making. Twenty-three per cent of clinical criteria used were based on guidelines. Non-funding PCTs were spread in patches throughout the country, but the West Midlands stood out as a particularly black spot. On reviewing PCTs that had received requests for funding in the preceding 12 months, 46% did not fund any of the requests, 17% funded 50% or less and 37% funded all the requests received. Of the PCTs funding under exceptional circumstances, only 37% actually funded any of the requests received. Conclusion: Despite guidelines on the management of erectile dysfunction, there remains variability in access to penile prosthesis surgery. The West Midlands and the Southeast (excluding London) are the worst places to live with regards to access to prostheses; Scotland and Wales appear to be the best. Guidelines are rarely used in decision making. Funding remains an important factor in determining who receives potentially life-changing treatment for erectile dysfunction refractory to all other management options. A patient’s address and personal wealth appear to have a larger impact than guidelines.
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Affiliation(s)
- O Kalejaiye
- Department of Urology, Plymouth Hospitals NHS Trust, UK
| | - BA Parsons
- Department of Urology, Plymouth Hospitals NHS Trust, UK
| | - R Pearcy
- Department of Urology, Plymouth Hospitals NHS Trust, UK
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Hellstrom WJG, Montague DK, Moncada I, Carson C, Minhas S, Faria G, Krishnamurti S. Implants, mechanical devices, and vascular surgery for erectile dysfunction. J Sex Med 2010; 7:501-23. [PMID: 20092450 DOI: 10.1111/j.1743-6109.2009.01626.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The field of erectile dysfunction (ED) is evolving and there is a need for state-of-the-art information in the area of treatment. Aim. To develop an evidence-based, state-of-the-art consensus report on the treatment of erectile dysfunction by implants, mechanical devices, and vascular surgery. METHODS To provide state-of-the-art knowledge concerning treatment of erectile dysfunction by implant, mechanical device, and vascular surgery, representing the opinions of 7 experts from 5 countries developed in a consensus process over a 2-year period. MAIN OUTCOME MEASURE Expert opinion was based on the grading of evidence-based medical literature, widespread internal committee discussion, public presentation, and debate. RESULTS The inflatable penile prosthesis (IPP) is indicated for the treatment of organic erectile dysfunction after failure or rejection of other treatment options. Comparisons between the IPP and other forms of ED therapy generally reveal a higher satisfaction rate in men with ED who chose the prosthesis. Organic ED responds well to vacuum erection device (VED) therapy, especially among men with a suboptimal response to intracavernosal pharmacotherapy. After radical prostatectomy, VED therapy combined with phosphodiesterase type 5 therapy improved sexual satisfaction in patients dissatisfied with VED alone. Penile revascularization surgery seems most successful in young men with absence of venous leakage and isolated stenosis of the internal pudendal artery following perineal or pelvic trauma. Currently, surgery to limit venous leakage is not recommended. CONCLUSIONS It is important for the future of the field that patients be made aware of all treatment options for erectile dysfunction in order to make an informed decision. The treating physician should be aware of the patient's medical and sexual history in helping to guide the decision. More research is needed in the area of revascularization surgery, in particular, venous outflow surgery.
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Affiliation(s)
- Wayne J G Hellstrom
- Tulane University School of Medicine, Department of Urology, New Orleans, LA 70112, USA.
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Kamel A, Khaouli R, Sabha M, Al Mitwally K, Fouad W, Landen H. The Real-Life Safety and Efficacy of Vardenafil. Clin Drug Investig 2007; 27:339-46. [PMID: 17451282 DOI: 10.2165/00044011-200727050-00005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
OBJECTIVE To assess the safety, efficacy and patient acceptability of vardenafil treatment under real-life conditions in patients with erectile dysfunction (ED). METHODS The present publication shows the results of a subgroup analysis of a multinational post-marketing surveillance study, including 2824 Middle East patients with ED whose attending physician chose vardenafil as the most appropriate therapy. Patients were assessed at an initial visit for demographic and baseline characteristics. At one or two follow-up visits, covering a period of approximately 2 months or eight vardenafil intakes, patients were interviewed about overall treatment success (general improvement of erection, number of tablets taken until improvement, patient's satisfaction with overall efficacy and tolerability, comparison with last ED treatment). All adverse events were recorded and assessed for a possible relationship to treatment, and for severity. RESULTS An overall improvement in erections was reported in 94.3% of patients. Most patients achieved treatment success after the first (67.0%) or second (83.6% cumulative) tablet. Diabetic patients had a similar improvement rate (92.2%) and 73.5% of patients who had undergone radical prostatectomy reported an overall improvement. The rate of adverse drug reactions (ADRs) was low (9.1% of patients). The most common ADRs were headache (5.8%), flushing (1.6%), nasal congestion (1.0%), dyspepsia (0.6%) and nausea (0.5%). In total, 88.9% of patients wanted to continue treatment with vardenafil. CONCLUSION Vardenafil was effective, reliable and well tolerated in patients with ED treated under real-life conditions.
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Affiliation(s)
- A Kamel
- German Polyclinic, Dubai, United Arab Emirates
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Jain S, Terry TR. Penile prosthetic surgery and its role in the treatment of end-stage erectile dysfunction - an update. Ann R Coll Surg Engl 2006; 88:343-8. [PMID: 16834850 PMCID: PMC1964635 DOI: 10.1308/003588406x114758] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The treatment of erectile dysfunction has been revolutionised with the introduction of orally active phosphodiesterase inhibitors which are successful in 70-80% of men. However, there remain a group of men in whom conservative treatment fails and surgical insertion of a penile prosthesis is required. This type of surgery has in the past been associated with technical difficulties and a high complication rate. This has spurred numerous developments in prosthesis design and surgical technique with the field changing at a rapid pace. Perhaps the most significant is the use of antimicrobial coatings on prostheses that have been shown to reduce the infection rate significantly. This review highlights those developments reported in the last 5 years.
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Affiliation(s)
- S Jain
- Urology Group, Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, UK.
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van Ahlen H, Zumbé J, Stauch K, Landen H. The real-life safety and efficacy of vardenafil: an international post-marketing surveillance study--results from 29 358 German patients. J Int Med Res 2005; 33:337-48. [PMID: 15938595 DOI: 10.1177/147323000503300309] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We assessed the safety, efficacy and patient acceptability of vardenafil (Levitra, Bayer HealthCare, Leverkusen, Germany) under real-life conditions in patients with erectile dysfunction (ED) in a multinational post-marketing surveillance study. An initial and up to two follow-up visits were documented for 29 358 German ED patients receiving vardenafil. Patients were interviewed about overall treatment success, and individual sexual attempts were evaluated in a patient questionnaire. Overall erectile improvement was reported by 93.9% of physicians, and similar improvement rates were reported for both 10 mg and 20 mg vardenafil dosages. Most patients experienced improved erections after the first (73.6%) or second (88.5%) tablet. Sexual attempts were successful with respect to partner penetration in 94.9% of patients and with respect to maintenance of erection during intercourse in 87.7% of patients. Adverse drug reactions were very rare (1.3% of patients). Vardenafil was highly effective, reliable and well tolerated in ED patients treated under real-life conditions.
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Abstract
Erectile dysfunction (ED) is a highly prevalent and often undertreated condition. It may be a symptom of underlying, chronic illness and can have a negative impact on quality of life, psychosocial health, and relationships. The aging of the population, as well as the introduction of new treatment options, such as sildenafil, has led to increased public awareness of this disorder. New oral therapeutic agents are on the horizon. This article provides an overview of the physiology of erection, the pathophysiology of ED, and modern patient evaluation. Management options, including traditional therapeutic approaches as well as the new generation of oral agents, are also presented.
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Affiliation(s)
- Ridwan Shabsigh
- Department of Urology, Columbia University College of Physicians and Surgeons, 161 Fort Washington Avenue, New York, New York 10032, USA.
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Anastasiadis AG, Wilson SK, Burchardt M, Shabsigh R. Long-term outcomes of inflatable penile implants: reliability, patient satisfaction and complication management. Curr Opin Urol 2001; 11:619-23. [PMID: 11734699 DOI: 10.1097/00042307-200111000-00010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Despite the revolutionary introduction of oral erectogenic agents for the treatment of erectile dysfunction, there will always be patients who do not respond to conservative therapy. Penile prosthetic surgery remains an important option for these patients. Mechanical reliability and patient satisfaction have improved significantly throughout the years. This review focuses on the most recent and important updates regarding product enhancements, patient satisfaction studies, and management of intra- and postoperative problems.
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Affiliation(s)
- A G Anastasiadis
- Department of Urology, College of Physicians and Surgeons, Columbia University, New York, USA
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Porst H, Rosen R, Padma-Nathan H, Goldstein I, Giuliano F, Ulbrich E, Bandel T. The efficacy and tolerability of vardenafil, a new, oral, selective phosphodiesterase type 5 inhibitor, in patients with erectile dysfunction: the first at-home clinical trial. Int J Impot Res 2001; 13:192-9. [PMID: 11494074 DOI: 10.1038/sj.ijir.3900713] [Citation(s) in RCA: 229] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2000] [Accepted: 05/05/2001] [Indexed: 11/09/2022]
Abstract
Vardenafil, a novel selective phosphodiesterase type 5 inhibitor, was evaluated in its first large-scale at-home trial. A total of 601 men with mild to severe erectile dysfunction (ED) were enrolled in this multi-centre, randomized, double-blind, placebo-controlled trial of 12 weeks of treatment with either placebo or 5, 10 and 20 mg of vardenafil. Primary endpoints were Q3 (vaginal penetration) and Q4 (maintenance of erection) of the International Index of Erectile Function (IIEF). In the intent-to-treat population (n=580), the changes from baseline for 5, 10 and 20 mg vardenafil (1.2, 1.3 and 1.5, respectively) were all improved (P<0.001) over placebo (0.2) for Q3 and were similarly improved for Q4 (1.4, 1.5 and 1.7) compared to placebo (0.5) (P<0.001). All vardenafil doses improved all IIEF domains compared to placebo (P<0.001). The percentage of successful intercourses was between 71 and 75% for the three vardenafil doses. For the 20 mg dose, 80% of the patients experienced improved erections (GAQ) compared to 30% for placebo. Most frequent treatment-emergent adverse events were headache (7-15%), flushing (10-11%) and up to 7% for dyspepsia or rhinitis. Vardenafil treatment resulted in a high efficacy and low adverse-event profile in a population with mixed ED etiologies.
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Affiliation(s)
- H Porst
- Urological Practice, Hamburg, Germany.
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Abstract
Implantation of penile prostheses was a very popular topic in the published literature on reconstructive urological surgery in the year 2000. Monocomponent, multicomponent, semirigid and inflatable prosthesis techniques were investigated. The best results were obtained with multicomponent inflatable prostheses. For penile reconstruction, various techniques were described. All authors used myocutaneous sensitive forearm flaps. Good results were reported.
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Bhojwani, Jain, Kockelbergh, Terry. Sexual satisfaction after penile prosthesis insertion for the treatment of erectile dysfunction. ACTA ACUST UNITED AC 1998. [DOI: 10.1046/j.1460-2679.1998.00038.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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