vasectomy

vasectomy

[va-sek-tuh-mee]
vasectomy, male sterilization by surgical excision of the vas deferens, the thin duct that carries sperm cells from the testicles to the prostate and the penis. Vasectomy is a popular method of birth control: in 1983, figures showed that approximately 10 million men had been sterilized in the U.S. since 1969. Excision of the vas deferens is a minor surgical procedure that can be performed in a physician's office in less than half an hour. A small incision is made on one side of the scrotum (the external sac housing the testes) and the vas deferens is located, cut, and the ends tied off. The incision is closed and the procedure is repeated on the other side. After surgery, it is necessary to wait until a negative sperm count is obtained before discarding other means of contraception, because viable sperm cells are retained in the seminal vesicles (the pair of storage pouches where sperm is mixed with other components of semen) and along the various sperm ducts. In addition it is usually advised that the patient be reexamined after a year, because the severed ends of the vas deferens occasionally reknit. Sterility resulting from vasectomy is considered to be permanent, and attempts at surgically reversing vasectomy, called vasovasotomy, have had limited success. In India, where the government is trying to stem the tide of overpopulation, money is paid to men who submit to voluntary vasectomy. Efforts to overcome the irreversibility of vasectomy have also led to experimentation with the implantation of faucetlike devices that can be made to open or close the sperm duct in a simple operation. Such devices have functioned successfully in animals but are still considered experimental in humans because of their unproved reversibility, high cost, and the degree of surgical skill needed to implant them. Another option suggested to those undergoing vasectomy is to preserve their fertility by depositing semen in sperm banks. Such semen samples are frozen in liquid nitrogen below -300°F; (-185°F;) and are considered to be viable for an indefinite period. However, there is considerable debate over the scientific and ethical aspects of sperm freezing, and the practice is still considered experimental. Researchers have examined the possible negative physiological effects of vasectomy, but there is no conclusive evidence that any link exists between the procedure and disease.

See S. D. Mumford, Vasectomy: The Decision-Making Process (1978); G. Denniston, Understanding Vasectomy (1978).

Severing of the vas deferens, which carries sperm from the testes to the prostate gland, to cause sterility or prevent infection. This relatively simple procedure, which can be performed in a doctor's office with local anesthetics, removes the ability to father children without affecting ability to achieve erection or orgasm. The vas is cut near its beginning, in the scrotum. The cut ends may be sealed off or left open. Reversal is more likely to succeed in the latter case; microsurgery has improved the success rate.

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Vasectomy is a surgical procedure in which the vasa deferentia of a man are cut for the purpose of sterilization.

Types

There are some variations on the procedure such as no-scalpel (keyhole) vasectomies, in which a sharp hemostat, rather than a scalpel, is used to puncture the scrotum. Another type of vasectomy which may reduce the risk of chronic pain is called an "open ended" vasectomy. A "normal" vasectomy typically seals both ends of the vas deferens with stitches, heat, metal clamps or a combination, after cutting. The open-ended vasectomy obstructs only the top end of the vas deferens. With this method sperm leaks out from the lower severed end of the vas deferens and into the scrotum, thus hopefully avoiding a build-up of pressure in the epididymis. The likelihood of long-term testicular pain from "backup pressure" seems to be reduced using this method.

Side effects

After vasectomy, the testes remain in the scrotum where Leydig cells continue to produce testosterone and other male hormones that continue to be secreted into the blood stream. Some studies find that sexual desire is unaffected in over 90% of vasectomized men, whereas other studies find higher rates of diminished sexual desire. The sperm-filled fluid from the testes contributes about 10% to the volume of an ejaculation (in men who are not vasectomized) and does not significantly affect the appearance, texture, or smell of the ejaculate.

When the vasectomy is complete, sperm can no longer exit the body through the penis. The testicles continue to produce sperm, but they are broken down and absorbed by the body. Much fluid content is absorbed by membranes in the epididymis, and much solid content is broken down by the responding macrophages and re-absorbed via the blood stream. Sperm is matured in the epididymis for about a month once it leaves the testicles. Approximately 50% of the sperm produced never make it to the orgasmic stage in a non-vasectomized man. After vasectomy, the membranes increase in size to absorb and store more fluid; this triggering of the immune system causes more macrophages to be recruited to break down and re-absorb more of the solid content. Within one year after a vasectomy, sixty to seventy percent of vasectomized men develop antisperm antibodies. In some cases, vasitis nodosa, a benign proliferation of the ductular epithelium, can also result. The buildup of sperm increases pressure in the vas deferens and epididymis. To prevent damage to the testes, these structures eventually rupture in more than half the cases. The entry of the sperm into the scrotum causes sperm granulomas to be formed by the body to contain and absorb the sperm which the body treats as a foreign substance.

Effectiveness

Early failure rates, i.e. pregnancy within a few months after vasectomy, are below 1%, but the effectiveness of the operation and rates of complications vary with the level of experience of the surgeon performing the operation and the surgical technique used.

Although late failure, i.e. pregnancy after recanalization of the vasa deferentia, is very rare, it has been documented.

Prevalence

Worldwide, approximately 6% of married women using contraception rely on vasectomy.

Compared to tubal ligations

The rate of vasectomies compared to tubal ligations worldwide is extremely variable among countries, and the statistics are mostly based on questionnaire studies rather than actual counts of procedures performed. Worldwide, approximately five times as many married women rely on female sterilization as those relying on male sterilization. In the U.S. about 3 times as many women at risk for unintended pregnancy rely on tubal ligation as on vasectomy. In the U.S. tubal ligation is used more frequently than vasectomy, although the proportions vary from state to state. In Britain, vasectomy is more popular than tubal ligation, though this statistic may be as a result of the data-gathering methodology. Couples who opt for tubal ligation do so for a number of reasons, including:

  • Convenience of coupling the procedure with giving birth at a hospital.
  • Fear of side effects in the man.
  • Fear of surgery in the man.

Couples who choose vasectomy are motivated by, among other factors:

  • The lower cost of vasectomy
  • The simplicity of the surgical procedure
  • The lower mortality of vasectomy
  • Fear of side effects in the woman
  • Fear of "major" surgery in the woman

Complications

Short-term complications include temporary bruising and bleeding, known as hematoma. The primary long-term complication is a permanent feeling of pain - Post-Vasectomy Pain Syndrome.

Animal and human data indicate that vasectomy does not increase atherosclerosis and that increases in circulating immune complexes after vasectomy are transient. Furthermore, the weight of the evidence regarding prostate and testicular cancer suggests that men with vasectomy are not at increased risk of these cancers.

Post-Vasectomy Pain Syndrome

Post-Vasectomy Pain Syndrome (PVPS), genital pain of varying intensity that may last for a lifetime, is estimated to appear in between 5% and 35% of vasectomized men, depending on the severity of pain that qualifies for the particular study The pain can be orchialgia, pain with intercourse, ejaculation, or physical exertion, or tender epididymides. In one study, vasectomy reversal was found to be 69% effective for reducing the symptoms of chronic post-vasectomy pain. Treatment options for 31% of patients whose pain did not respond to vasectomy reversal were limited. The study was very small, only evaluating 13 patients, making it difficult to draw solid conclusions. In severe cases castration has been resorted to.

Possible Vasectomy-Dementia Link

Researchers reported in February 2007 that a survey of a small number of men with primary progressive aphasia, a rare speech disorder, found that more than twice as many as would be expected had undergone vasectomies. The study has not yet been verified by other researchers, and the authors say larger studies are needed to better understand the issue.

Psychological Reactions

Some men experience depression or anger and go through a period of mourning over the loss of their reproductive ability. This emotion is similar to what some women experience after menopause. Approximately half of all vasectomized men prefer to keep their sterilization secret. Depending upon the study, between five and eleven percent of men regret the decision to have a vasectomy.

Reversal

Although men considering vasectomies should not think of them as reversible, and most men and their spouses are satisfied with the operation, there is a procedure to reverse vasectomies using vasovasostomy (a form of microsurgery first performed by Earl Owen in 1971). Vasovasostomy is effective at achieving pregnancy in only 50%-70% of cases, and it is very costly, with total out-of-pocket costs in the United States of approximately $7,000 . The rate of pregnancy depends on such factors as the method used for the vasectomy and the length of time that has passed since the vasectomy was performed. The reversal procedures are frequently impermanent, with occlusion of the vas recurring two or more years after the operation.

Since the body often produces antibodies against sperm, sperm counts are rarely at pre-vasectomy levels. There is evidence that men who have had a vasectomy may produce more abnormal sperm, which would explain why even a mechanically successful reversal does not always restore fertility. The higher rates of aneuploidy and diploidy in the sperms of men who have undergone vasectomy reversal may lead to a higher rate of birth defects .

In order to allow a possibility of reproduction (via artificial insemination) after vasectomy, some men opt for cryostorage of sperm before sterilization.

Availability

References

The vasectomy is also covered in Canada

External links

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