Tobias Kohler

A pilot study on the early use of the vacuum erection device after radical retropubic prostatectomy

To evaluate the effect of the early use of the vacuum erection device (VED) on erectile dysfunction (ED) and penile shortening after radical retropubic prostatectomy (RP), as these are important concerns for men choosing among treatment alternatives for localized prostate cancer.

Prevalence of Androgen Deficiency in Men with Erectile Dysfunction

OBJECTIVES Erectile dysfunction (ED) and androgen deficiency in aging men are two separate clinical entities that often overlap. Controversy exists regarding the most appropriate total testosterone level that defines androgen deficiency in aging men, and its prevalence in men with ED is still uncertain. We evaluated the prevalence and risk factors of low and low-normal testosterone levels in men presenting for an initial ED evaluation. METHODS The computerized charts from 1987 to 2002 of 2794 men aged 25 to 80 years and presenting with a primary complaint of ED who also had serum total testosterone levels measured were retrospectively reviewed. Multiple testosterone level cutpoints and a linear regression model (including age, diabetes, cholesterol, anemia, creatinine, and prostate-specific antigen) were used to analyze the factors that correlated with hypogonadism. RESULTS The prevalence of androgen deficiency was 7%, 23%, 33%, and 47% for testosterone levels of less than 200, less than 300, less than 346, and less than 400 ng/dL, respectively. An abrupt increase in hypogonadism prevalence occurred in men aged 45 to 50, beyond which a plateau of prevalence was maintained until older than 80 years of age. Age, the presence of uncontrolled diabetes, high total cholesterol, and anemia all correlated with significantly decreased testosterone levels in men with ED. The prostate-specific antigen level and creatinine did not affect the testosterone levels. CONCLUSIONS Androgen deficiency was quite common in men presenting with ED and correlated significantly with age, uncontrolled diabetes, hypercholesteremia, and anemia. Although additional prospective studies evaluating the effect of testosterone supplementation in this population are needed, clinicians, including urologists, should be keenly aware of the large overlap of patients with ED who might also have the entity, androgen deficiency in the aging male.

A Case of a Metanephric Adenoma of the Kidney Surgically Treated with Robot-Assisted Laparoscopic Partial Nephrectomy

Metanephric adenomas are a rare neoplasm of the kidney with less than 200 cases reported. We report a case of a metanephric adenoma incidentally found on imaging in a 52-year-old Hispanic female and treated with robot-assisted laparoscopic partial nephrectomy. A brief review of the literature is also included.

Contemporary Treatment of Erectile Dysfunction

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Self-Injection, Transurethral and Topical Therapy in Erectile Dysfunction

Currently there are three main agents for intracavernosal injection (ICI) therapy and one agent for intraurethral therapy approved by the FDA for the treatment of erectile dysfunction (ED). These effective agents were the focus of intense interest in the mid1990s, but were quickly relegated to second line therapy after the appearance of sildenafil. Indeed, while sildenafil prescriptions nearly doubled to 14 million from 1998 to 2001, prescriptions for alprostadil injections dropped by one third to 159,000 and MUSE™ prescriptions fell by two thirds to 132,000 (Wysowski & Swann, Journal of Urology, 169, 1040–1042, 2003). It must be noted, however, that the phosphodiesterase-5 inhibitors (PDE5Is) are ineffective in about 22–35% of men (McMahon, Samali, & Johnson, Journal of Urology, 164, 1192–1196, 2000). Furthermore, of the men treated with oral agents, a significant proportion will ultimately fail (even after PDE5I dose escalation) secondary to progression of their disease. Additionally, there are a significant number of men with contraindications to PDE5Is. The result is a large number of men who are unable to utilize oral treatments for erectile dysfunction. Fortunately, second line therapies in the form of vacuum erection devices (discussed in detail in a separate chapter), ICI and MUSE™ are highly effective treatments that may be used when PDE5Is are contraindicated.

The penoscrotal surgical approach for inflatable penile prosthesis placement

Optimizing outcomes with placement of inflatable penile prostheses (IPPs) can be challenging, especially in inexperienced hands. In this article, we outline Dr. Köhler’s penoscrotal penile prosthesis surgical approach. We also highlight patient selection, post-operative care and complications.

Autoinflation Leading to Failure of Two-Piece Ambicor Implantable Penile Prosthesis: An Outcome from a Methodical Treatment of Recalcitrant Stuttering Priapism

Introduction. We present the case of a patient who received a two-piece Ambicor penile prosthesis for idiopathic recurrent “stuttering” priapism refractory to other treatment options. The patient returned unable to deflate the device due to an interesting anatomically induced mechanical failure. Aims. To describe the method and findings of this inflatable prosthesis failure. Results. Prosthesis failure occurred due to restrictive corporal diameter and the unique characteristics of fluid reservoir location in the two-piece inflatable prosthesis. The patient was successfully converted to a semirigid prosthesis with resolution of the pain that was due to his prosthesis autoinflation. Conclusion. Stuttering priapism remains a challenging clinical problem. Penile implantation is a reasonable long-term solution in a patient refractory to less invasive options. In patients with fibrotic corpora, a malleable device should be considered (at least temporarily) if unable to dilate comfortably to 13 mm.

Surgical patient selection and counseling

The objectives of patient selection and counseling are ultimately to enhance successful outcomes. However, the definition for success is often narrowly defined in published literature (ability to complete surgery, complications, satisfaction) and fails to account for patient desires and expectations, temporal changes, natural history of underlying diseases, or independent validation. Factors associated with satisfaction and dissatisfaction are often surgery-specific, although correlation with pre-operative expectations, revisions, and complications are common with most procedures. The process of appropriate patient selection is determined by the integration of patient and surgeon factors, including psychological capacity to handle unsatisfactory results, baseline expectations, complexity of case, and surgeon volume and experience. Using this model, a high-risk scenario includes one in which a low-volume surgeon performs a complex case in a patient with limited psychological capacity and high expectations. In contrast, a high-volume surgeon performing a routine case in a male with low expectations and abundant psychiatric reserve is more likely to achieve a successful outcome. To further help identify patients who are at high risk for dissatisfaction, a previously published mnemonic is recommended: CURSED Patient (compulsive/obsessive, unrealistic, revision, surgeon shopping, entitled, denial, and psychiatric). Appropriate patient counseling includes setting appropriate expectations, reviewing the potential and anticipated risks of surgery, post-operative instruction to limit complications, and long-term follow-up. As thorough counseling is often a time-consuming endeavor, busy practices may elect to utilize various resources including educational materials, advanced practice providers, or group visits, among others. The consequences for poor patient selection and counseling may range from poor surgical outcomes and patient dissatisfaction to lawsuits, loss of credibility, or even significant patient or personal harm.

Aspergillosis of the scrotum: non-surgical management.

Abstract:  Disseminated aspergillar infection involving the genitourinary system is quite rare and often fatal. Only one previous case of aspergillosis of the scrotum has been reported. In the previous report, the patient died despite aggressive surgical debridement. We report a case of aspergillosis involving the scrotum in which the patient did well with conservative medical management.

Analysis of semen parameters during 2 weeks of daily ejaculation: a first in humans study

Background Timed and frequent intercourse around the time of female ovulation is recommended to improve conception. Although a significant number of articles have examined how the length of abstinence affects these semen analysis, the effects of frequent (daily) ejaculation has not been rigorously studied. Methods Twenty normal men were recruited for daily ejaculation over 14 consecutive days, after a 3–5 days abstinence period. Semen samples were collected at the beginning of the study (day 1) and then on days 3, 7 and 14. In addition to the standard semen analysis, markers of sperm DNA quality were assessed. Results The mean age of men completing the study was 25 years (range, 23–33 years). Significant decreases were observed in mean semen volume, total motile count (TMC) and sperm concentration during the study period without significant changes in motility or morphology. A large initial change in ejaculate volume, TMC and sperm concentration provided the primary difference in these values over the study period, with a plateau in values after this initial decrease (after study day 3). Metrics of DNA integrity did not change in a statistically or clinically meaningful way during the study period. Conclusions While a small study, this represents the most extensive examination of sperm quality with daily ejaculation. These findings generally support an approach of a short period of abstinence followed by daily copulation around ovulation to maximize the number of sperm available and optimize conception.