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Sexual impotence is associated with a reduced production of oxytocin and with an increased production of opioid peptides in the paraventricular nucleus of male rats.

Oxytocin plays a physiological stimulatory role on sexual behavior. Conversely, opioid neuropeptides play a physiological inhibitory role. Here we show that in sexually impotent rats there is a reduced expression of oxytocin mRNA and an increased expression of proenkephalin and pro-dynorphin mRNA in the paraventricular nucleus of hypothalamus (PVN), a brain structure of key importance for sexual behavior. These data suggest that an imbalance in the production of oxytocin and of opioid peptides in the PVN, with prevalence of opioid peptides, may underlie a condition of sexual impotence.

Animals↗

Intracavernous injection of vasoactive drugs, an alternative for treating impotence in spinal cord injury patients.

We report on our results with the intracavernous injection and self-injection of papaverine-phentolamine in a group of spinal cord injury patients with erectile impotence. This technique offers the possibility of achieving a full erection which continues for a few hours and disappears afterwards. In our limited experience no major complications have occurred. If our findings are confirmed, in future, the self-injection technique may become a valuable alternative to implanting a prosthesis in impotent paraplegics and tetraplegics.

Drug Combinations↗

An open trial of vacuum penile tumescence: constriction therapy for neurological impotence.

Sexual dysfunction is a frequent result of traumatic and non traumatic neurological disorders, including spinal cord injury, stroke, traumatic brain injury and autonomic neuropathy (for example, as may be seen in patients with diabetes mellitus). Although many methods have been suggested for the treatment of some of these problems in male patients, most are invasive and have a substantial morbidity. This is the report of a pilot trial of vacuum tumescence constriction therapy for 30 patients with chronic neurological impotence. Seventeen of these patients, following sexual counselling and training, decided to purchase such a device. At follow up, a mean of 21 months, over 50% of those who had purchased the device were still actively using it. The frequency of coitus increased from 0.3/wk to 1.5/wk (t = -5.7; p less than 0.0001). No significant morbidity was reported by patients. Vacuum tumescence constriction therapy shows promise as a noninvasive method for the treatment of neurological impotence.

Adult↗

New insights into the role of endothelin-1 in radiation-associated impotence.

The objectives of this work were to: (1) Determine if prostate and penile tissue levels of endothelin-1 (ET-1) are increased in a rat following pelvic irradiation. (2) Determine if an ETa receptor antagonist (BQ-123) potentiates erectile function in these irradiated animals. Rats were divided into three study groups: control, 1000 cGy and 2000 cGy. The experimental groups received a single dose of radiation to the pelvic region. A time course was established to measure the effects of irradiation on prostate and penile tissue levels of endothelin-1 (ET-1)-like immunoreactivity. The effect of intracavernous injection of BQ-123 (25 microg/30 microl) was evaluated by measuring intracavernous pressure (ICP) following cavernous nerve electrical field stimulation. In the 2000 cGy group, a significant rise in ET-1-like immunoreactivity tissue levels was observed at 20 days. A significant decrease in ICP was recorded in the 1000 and 2000 cGy irradiated rats compared to the control group. Only the 2000 cGy group had a significant improvement in erectile function following BQ-123 administration. A significant improvement was observed 20 min post-administration, lasted 90 min, and was back to pre-administered levels at 120 min. The conclusion made was that radiation-induced impotence in irradiated rats is associated with an increased production of ET-1. Preliminary results are suggestive that ETa receptor antagonist may be of use to reverse such radiation-induced impotence in these irradiated animals.

Animals↗

Anatomy of Denonvilliers' fascia and pelvic nerves, impotence, and implications for the colorectal surgeon.

BACKGROUND: The development and anatomy of Denonvilliers' fascia have been controversial for many years and confusion exists about its operative appearance. Better appreciation of this poorly understood anatomy, and its significance for impotence after rectal dissection, may lead to further functional improvements in pelvic surgery. METHOD: A literature review of the embryology and anatomy of Denonvilliers' fascia and impotence after pelvic rectal surgery was undertaken. RESULTS: Denonvilliers' fascia has no macroscopically discernible layers. The so-called posterior layer refers to the fascia propria of the rectum. The incidence of erectile and ejaculatory dysfunction after rectal excision is high in older patients, and when performed for rectal cancer. There is no consensus about the relationship of Denonvilliers' fascia to the plane of anterior dissection for rectal cancer. CONCLUSION: Colorectal surgeons should focus on the important anatomy between the rectum and the prostate to improve functional outcomes after rectal excision. A classification of the available anterior dissection planes is proposed. Surgeons should be encouraged to document the plane used as well as outcome in terms of sexual function.

Autonomic Nervous System↗

Correcting impotence in the male dialysis patient: experience with testosterone replacement and vacuum tumescence therapy.

Sexual dysfunction remains a common and often distressing problem in the male dialysis population. Traditionally its management has consisted of correction of anemia, optimization of dialysis, removal of implicated medication, and finally depot injections of a testosterone ester. At a dedicated renal impotence clinic, we studied the effectiveness of testosterone replacement in men with biochemically proven hypogonadism and then vacuum tumescence therapy in those with continued erectile dysfunction. Depot testosterone was given to 27 patients (aged 52.4+/-2.5 years; duration of dialysis, 2.00+/-0.40 years; and duration of sexual dysfunction, 2.92+/-0.49 years): sexual function was fully restored in only three (11.1%), and two gradually lost the response over 18 months. Nineteen patients (70.3%) had partial responses, varying from an increased sense of well-being alone to restored sexual function apart from an impairment of the duration of penile erection. Five patients (18.5%) had no response, and testosterone was contraindicated in another four. Four of the treated patients (14.8%) reported fluid retention. Vacuum tumescence devices were then offered to 32 patients who remained impotent but declined by six. Twenty-six patients (aged 49.6+/-2.2 years; duration of dialysis, 2.50+/-0.58 years; and duration of sexual dysfunction, 3.26+/-0.56 years) used the devices, with 19 (73.1%) having full correction of their erectile dysfunction; six also continued with depot testosterone to maintain their libido. Penile discomfort was described by five patients (19.2%) whose potency was not restored. A further five predialysis patients have used the devices, and all had correction of their erectile dysfunction. The correction of biochemical hypogonadism in the male dialysis population with testosterone rarely restores sexual function to normal, whereas vacuum tumescence therapy corrects penile erection dysfunction in most patients.

Drug Implants↗

[Disorders of the hypothalamo-hypophyseal-gonadal axis and erectile impotence].

In the course of a standardized diagnostic programme LH, FSH, testosterone, prolactin and oestradiol were measured in 204 patients with erectile impotence (mean age 47.6 years). A purely organogenic abnormality was found in 125 (61.3%), a mixed organogenic-psychogenic one in 39 (19.1%), and a purely psychogenic one in 40 (19.6%). Thirteen patients (6.3%) had an abnormality of the hypothalamic-hypophyseal-gonadal axis, nine in addition had severe organogenic changes as the clear cause of the impotence. History and clinical findings were unremarkable in only one patient. Routine determination of hormones would seem to be cost-effective only if an important organic deficit has been excluded as the cause of an erection abnormality and therapeutic consequences can be drawn from any abnormal hormone values that are obtained.

Adult↗

Impotence and bicycling. A seldom-reported connection.

A man riding a stationary bicycle experienced transient tight sensations around the head of his penis during the exercise and progressive impairment of sexual potency over a period of more than one year. Lowering the bicycle seat terminated the bouts of impaired penile sensation, and one month after the patient discontinued the bicycle exercises, sexual potency returned. The course supported an ischemic mechanism for the abnormal penile sensation and a neural mechanism for impotence. Impotence has been associated with both vascular and neural lesions, and there is evidence for both vascular and neural compression in the perineal area during bicycle riding. A relationship between sexual dysfunction and bicycling may be more common than formerly suspected.

Athletic Injuries↗

The assessment of nocturnal REM erection in the differential diagnosis of sexual impotence.

A new method for differentiating psychogenic from organic cases of sexual impotence is described based on the assesst of nocturnal REM erection in nine patients. It is our tentative impression that in psychogenic impotence nocturnal REM erection may be normal in amount and degree and an excellent indicator of erectile potential. In these cases a marked discrepancy exists between the amount and degree of nocturnal erection and the patient's daytime performance level attained during attempted coitus or masturbation. In the organic patients, on the contrary, such a discrepancy does not exist; instead, the maximal nocturnal erection attained corresponds closely to and mirrors the patient's impaired waking performance. This new method may be very useful in the diagnosis, prognosis, and decision as to type of treatment, especially in difficult cases.

Adult↗

Discrimination of organic versus psychological impotence with the DSFI: a failure to replicate.

Patients with a presenting complaint of erectile dysfunction were extensively investigated by a research team consisting of a urologist, vascular surgeon, psychiatrist and psychiatric social worker. Patients were assigned to organic and psychogenic groups according to specified criteria. Multiple comparisons of psychogenic and organic impotence cases on scores derived from the Derogatis Sexual Functioning Inventory (DSFI) did not differentiate the two groups. This inventory did, however, manifest numerous relationships with demographic variables. Failure to identify a psychological profile characteristic of psychogenic impotence was attributed to the heterogenity of this diagnostic grouping and selection processes in seeking treatment for such disorders.

Attitude↗

Vacuum devices for the impotent.

Vacuum constriction devices for the treatment of impotence achieve entrapment of blood in the penis following mechanically produced tumescence. Following application, blood flow is sustained, and the majority of users can achieve either an erection or an erection-like state that is satisfactory for intercourse. Properly motivated men can use these devices long-term without serious side effects. The devices are particularly effective in the management of partial impotence; they represent an attractive alternative to surgical procedures upon the penis, intracavernosal injection of vasoactive drugs, and sexual abstinence.

Erectile Dysfunction↗

Application of molecular biology to impotence research.

To encourage further application of molecular biology in impotence research, we have compiled a list of techniques that have been or can be used in such endeavors. While by no means complete or perfect, the list encompasses both some of the most commonly used (such as RT-PCR) and some of the most promising (such as gene chip) methods. All three levels of the gene expression hierarchy, namely, DNA, RNA, and protein, are represented in the discussion. Whenever possible, each technique is discussed with references relevant to impotence research. Interested readers therefore can trace the original or the most recent research protocols for more detailed information.

3',5'-Cyclic-GMP Phosphodiesterases↗

Impotence and blood pressure in the flaccid penis: relationship to nocturnal penile tumescence.

Evaluations of nocturnal penile tumescence (NPT) and penile blood pressure were performed on (1) a group of nondiabetics with normal NPT, (2) a group of nondiabetics with abnormally diminished NPT, and (3) a group of diabetics with abnormally diminished NPT. The 12 subjects in each group complained of impotence. Analysis of blood pressure data taken before the NPT evaluation suggests the possibility of selective low arterial blood pressure in impotent patients who show no obvious signs of other vascular disorders.

Blood Pressure↗

Impotence induced by a single gene mutation.

Inbred male mice homozygous for the stubby gene mutation were reported to be sterile nineteen years ago. However, the basis of the sterility has not been identified since testicular steroidogenesis and spermatogenesis are normal. In the present studies, the sexual behavior of stubby mice and their coisogenic, normal siblings was compared quantitatively. The experimental observations provided unequivocal evidence that the phenotypic basis of the sterility of stubby mice is impotency. Stubby mice represent the first animal model for the study of impotence and provide the first evidence of an autosomal gene mutation that has a primary effect on male sexual behavior.

Animals↗

Treatment of diabetic impotence with a vacuum device: efficacy and effects on psychological status.

Twelve patients with erectile impotence related to diabetic neuropathy were treated with a vacuum device, Pos-T-Vac. Efficacy of the device and psychological evaluation (Dyadic Adjustment Scale for marital satisfaction and Hamilton Rating Scale for depression) were performed before and 3 months after treatment. Vacuum therapy was successful in 75% of the patients. Patients with successful impotence treatment and normal baseline marital satisfaction scores showed a modest increase in the scores of marital satisfaction (from 114 +/- 3 points, baseline, to 121 +/- 3 points, posttreatment; p less than 0.05). Vacuum therapy for the treatment of erectile dysfunction due to diabetic autonomic neuropathy appears to be safe and effective.

Adult↗

The role of the radioisotope phallogram in the investigation of vasculogenic impotence.

Patients complaining of impotence were investigated through a multi-disciplinary approach to define the factors involved. Radioisotope phallography was performed on all the patients using 99Tcm-labelled red blood cells (RBCs) and dynamic records of the variation in activity over the penis were obtained. During the course of the study an intravenous injection of a vasodilator (isoxsuprine HCl) was administered. An analysis of the data provided quantitative parameters for measuring the changes in penile blood flow and penile blood volume in response to the vasodilator injection. The results indicate that the radioisotope phallogram is useful both in the diagnosis of vasculogenic impotence and in indicating the method of treatment.

Adult↗

Surgical treatment of impotence in the male. An 18-year experience with 250 penile implants.

We have treated more than 250 cases of impotence by inserting a penile rod. The implant has been modified intermittently, and it currently consists of a two-piece rod with a Y-shaped proximal portion to provide greater stability. Most of the patients we treated have been satisfied with the results of the surgery, and would have it repeated. Therefore, we feel that this prosthesis is an excellent one for treating male impotence.

Adult↗

Endocrinologic evaluation of impotence.

Among 600 impotent men who had endocrine evaluation for androgen deficiency, thyroid deficiency, and hyperprolactinemia, 192 (32%) were found to have an endocrine abnormality. Androgen deficiency was divided into primary testicular failure and "hypothalamic-pituitary dysfunction" by an androgen quotient derived using simultaneous gonadotropin and testosterone levels. This androgen quotient was found to correlate well with the response to testosterone and was more useful than the testosterone level in predicting which patients would benefit from long-term testosterone replacement. Unsuspected hypothyroidism (6%) and hyperprolactinemia (3%) were both common in this group of patients, and appropriate treatment reversed the impotence.

Erectile Dysfunction↗