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During a radical prostatectomy, these nerves may be injured. In many cases, this results in ED that is permanent, although the degree of dysfunction may be lessened through treatment.
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For instance, more detailed knowledge of the cavernous nerves in the pelvis led to the refinement of nerve-sparing prostatectomy. Understanding the biochemistry of normal sexual function led to the development of ED medications, including Viagra, Cialis, Stendra and Levitra. Current research is focused on better understanding the specific physiological pathways responsible for normal sexual function, developing more effective agents for managing ED, and learning how cavernous nerves heal and what factors can hasten the healing process. An intriguing line of inquiry over the generic levitra 24 h buy past 10 years has been treating the penis with low-intensity shock wave therapy (LiSWT). This counterintuitive approach to treating ED with energy transfer is based on a growing body of evidence suggesting that shock waves may stimulate new blood vessel growth, reduce scarring, and activate resident stem cells to help restore tissues.
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The pulses used for ED therapy are similar to – but less intense than – the shock waves that have been used for decades to treat urologic stones. A number of small, randomized, placebo-controlled studies have demonstrated benefits to erectile function in patients treated with shock waves to the penis. Unfortunately, the bulk of studies to date had limited follow-up, with most reporting out results at a mean of one month. Longer-term follow-up and data collection are topics of active inquiry, but currently there are no data to suggest that LiSWT will work as a single treatment for the majority of patients with severe ED related to prostate cancer treatment. LiSWT may eventually have a role as part of a multimodal protocol, but at this time it should be considered experimental.
Hormonal changes
ED is most commonly related to aging, but it also has a wide range of psychological, neurological, vascular, hormonal and pharmaceutical causes, and may result from radiation and surgical treatments for prostate and bladder cancer. This table lays out the basics, and more detailed explanations for each cause follow. Aging causes a progressive decline in sexual function even in healthy patients. Studies show that as men age, erections become less turgid (stiff) and the force and volume of ejaculation decrease. Also, with age, more time is needed to achieve another erection after orgasm (the so-called refractory period). Because the prostate makes most of the fluid in semen, patients who have undergone prostatectomy don't experience ejaculation. Radiation to the prostate, bladder or rectum also can damage the cavernous nerves and lead to problems with erections and ejaculation. These effects usually manifest a few years after treatment. Although ED and absence of ejaculation are common after prostate surgery or radiation, sexual desire and the ability to achieve orgasm are still possible. Doctors may be able to use nerve-sparing approaches in surgery or radiation therapy that can preserve mail order levitra online one or both nerve bundles. While the nerve-sparing technique preserves the possibility of penile erections, most patients nevertheless experience a decline in erectile function that may never be completely recovered. Hormone therapy for prostate cancer (androgen deprivation therapy) can also cause ED. The drop in testosterone reduces libido and can lead to erection difficulties. Whether these effects are reversible is related to the patient's age, degree of sexual function he had before treatment, and length of time on hormone therapy.
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Depression and performance anxiety both can lead to ED. Depression is associated with decreases in energy, interest in usual activities and libido. Performance anxiety, work stress and strained personal relationships also can affect erectile function in both conscious and subconscious ways. Penile erection depends on an intact nervous system, so any neurological injury or disease can cause ED. Parkinson's disease, Alzheimer's disease, stroke or head injury can lead to ED by affecting the libido or by interfering with the nerve impulses responsible for erections. Spinal cord injuries cause a decrease in erections related to the extent of the injury.
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Sensitivity to touch decreases over time, as do testosterone levels, and both changes can diminish sexual desire. While it's not possible to reverse the effects of aging, there's no age at which a person is too old for sex. Men can avoid or at least delay the most severe manifestations of age-associated sexual dysfunction by remaining physically active, sticking to a healthy diet, avoiding weight gain, not using tobacco, and generally doing things that promote heart health. ED is the most common side effect of both surgical and radiation treatments for prostate cancer. The cavernous nerve bundles – the nerves that drive erection – are located next to the prostate gland. Pelvic surgery – such as radical prostatectomy, cystectomy or colectomy – may injure the nerves that control erection.
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Long-standing diabetes may affect some nerves and lead to ED. Anything that decreases circulating testosterone in the body, including undergoing chemical or surgical castration or hormone therapy for prostate cancer, decreases libido and may make natural erections more difficult. A variety of conditions and habits can damage penile blood vessels over time and contribute to ED.
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High LDL ("bad") cholesterol or low HDL ("good") cholesterol Pelvic radiation therapy to treat prostate, bladder or rectal cancer Peyronie's disease (scarring with curvature of the penis) Damage to the penile spongy tissue that results in leaky veins (sometimes associated with aging) ED is common in patients with diabetes, cirrhosis (liver scarring), chronic kidney failure and many other chronic medical issues.
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Possible side effects of the device include temporary penile numbness, bruising, and semen trapped by the ring. Some patients also report that the erection they obtain with the device feels somewhat artificial. For men with ED who don't tolerate or respond to other treatments, a penile prosthesis offers an effective yet more invasive alternative, requiring surgery. Prostheses come in either a semirigid form or as an inflatable device. Most men prefer the inflatable prosthesis because it permits a more natural appearance when the penis is flaccid.
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Patients are under general anesthesia (completely asleep) for surgical placement of the prosthesis. An incision is made in the skin at the penis-scrotum junction. The spongy tissue of the penis is exposed and dilated; the prosthesis is sized; and then it's placed inside the erectile tissue. The pump containing the inflation and deflation mechanism is placed in the scrotum. The patient can control his erection at will, using the hydraulic pump to inflate and a release button to deflate the prosthetic implant.
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Because the nerves that control penile sensation are not injured, penile sensation and the ability to have an orgasm are typically maintained after placement. Full penile length may not be restored to the patient's natural erect status. Despite the need for surgery, patient and partner satisfaction rates for penile prostheses are as high as 85%. Side effects are rare but include infection, pain, and device malfunction or failure. Significant strides in scientific understanding of the anatomy and physiology of sexual function are aiding the development of new therapies. Many types of drugs are associated with developing ED. Here are some to be aware of: Certain antidepressants (including Prozac, Zoloft and Paxil) and antipsychotics, especially those that regulate serotonin, noradrenaline or dopamine. Beta-blockers and thiazide agents used to treat high blood pressure. Cimetidine, a drug for acid reflux disease. Estrogens and drugs with antiandrogenic action, such as ketoconazole and spironolactone, can lead to ED, decreased libido and breast enlargement.
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Many drugs of abuse, including tobacco, marijuana and narcotics.
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Medication is injected on one side of the penis. Pressure is held on the injection site for several minutes. For more details on exactly where and how to inject the penis and other information on this therapy, see the Penile Injections: A Patient Guide or Dr. Stacy Elliott's instructional video "Understanding Penile Injection" on YouTube. Occasionally associated with fainting, dizziness and low blood pressure.
Neurological conditions
Priapism, or a prolonged erection (lasting more than four hours), may occur. Can cause pain, infection, bruising and scarring if patients are not trained properly. May require self-stimulation to increase blood flow to the penis. If erection lasts more than four hours, seek medical care at your local emergency room or contact your urologist. May be ineffective if patients have vascular disease or blood flow problems.
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A vacuum erection device, or penis pump, may be helpful for patients who have only partial erections or who don't respond to or want to use other treatments. The device consists of a plastic cylinder connected to a pump and a constriction ring. Either manual or battery power is used to create suction around the penis and draw blood into it; the constriction ring is then released around the base of the penis to keep blood in the penis and maintain the erection. The device may be used safely for up to 30 minutes, at which point the constriction ring should be removed. The advantages of such a device are that it's relatively inexpensive and easy to use and there's no concerns about drug side effects or interactions. The cavernous nerves travel from the underside of the penis to the prostate. They regulate blood flow within the penis. In the flaccid state, relatively little blood flows in through the arteries and there is free outflow via the small veins exiting the spongy tissue just under the thick tunica (membrane surrounding the spongy tissue). During erection, the smooth muscle in the penis relaxes while the arteries widen to bring in more blood.