Vasectomy is a surgical procedure for male sterilization or permanent contraception. During the procedure, the male vas deferens are cut and tied or sealed so as to prevent sperm from entering into the urethra and thereby prevent fertilization of a female through sexual intercourse. Vasectomies are usually performed in a physician’s office, medical clinic, or, when performed on an animal, in a veterinary clinic—hospitalization is not normally required as the procedure is not complicated, the incisions are small, and the necessary equipment routine.
There are several methods by which a surgeon might complete a vasectomy procedure, all of which occlude (i.e., “seal”) at least one side of each vas deferens. To help reduce anxiety and increase patient comfort, men who have an aversion to needles may consider a “no-needle” application of anesthesia while the “no-scalpel” or “open-ended” techniques help to accelerate recovery times and increase the chance of healthy recovery.
Due to the simplicity of the surgery, a vasectomy usually takes less than thirty minutes to complete. After a short recovery at the doctor’s office (usually less than an hour), the patient is sent home to rest. Because the procedure is minimally invasive, many vasectomy patients find that they can resume their typical sexual behavior within a week, and do so with little or no discomfort.
Because the procedure is considered a permanent method of contraception and is not easily reversed, men are usually counseled/advised to consider how the long-term outcome of a vasectomy might affect them both emotionally and physically. The procedure is not often encouraged for young single childless men as their chances for biological parenthood are thereby more or less permanently reduced to almost zero. It is seldom performed on dogs (castration, a different procedure, remains the preferred reproductive control option for canines) but is regularly performed on bulls.
A vasectomy is done to prevent fertility in males. It ensures that in most cases the person will be sterile after confirmation of success following surgery. The procedure is regarded as permanent because vasectomy reversal is costly and often does not restore the male’s sperm count or sperm motility to prevasectomy levels. Men with vasectomies have a very small (nearly zero) chance of successfully impregnating a woman, but a vasectomy has no effect on rates of sexually transmitted infections.
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 bloodstream. Some studies have found that sexual desire after vasectomy may be somewhat diminished.
When the vasectomy is complete, sperm cannot exit the body through the penis. Sperm is still produced by the testicles but is 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 reabsorbed via the bloodstream. Sperm is matured in the epididymis for about a month before leaving the testicles. After vasectomy, the membranes must 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 reabsorb more solid content. Within one year after 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 accumulation of sperm increases pressure in the vas deferens and epididymis. The entry of the sperm into the scrotum can cause sperm granulomas to be formed by the body to contain and absorb the sperm which the body will treat as a foreign biological substance (much like a virus or bacterium).
|1 in 1400||Unwanted pregnancy (failure of vasectomy)|
|1 in 11||For comparison: unwanted pregnancy w/ typical use of pill|
|1 in 6||For comparison: unwanted pregnancy w/ typical use of condom|
|1 in 40||Infection after surgery|
|1 in 7||Pain at 7 months after vasectomy|
|1 in 110||Pain at 7 months affecting quality of life|
Vasectomy is the most effective permanent form of contraception available to men. In nearly every way that vasectomy can be compared to tubal ligation it has a more positive outlook. Vasectomy is more cost effective, less invasive, has techniques that are emerging that may facilitate easier reversal, and has a much lower risk of postoperative complications. Early failure rates, i.e. pregnancy within a few months after vasectomy, typically result from unprotected sexual intercourse too soon after the procedure while some sperm continue to pass through the vasa deferentia. Most physicians and surgeons who perform vasectomies recommend one (sometimes two) postprocedural semen specimens to verify a successful vasectomy; however, many men fail to return for verification tests citing inconvenience, embarrassment, forgetfulness, or certainty of sterility. In January 2008, the FDA cleared a home test called SpermCheck Vasectomy that allows patients to perform postvasectomy confirmation tests themselves;however, compliance for postvasectomy semen analysis in general remains low.
Late failure, i.e. pregnancy following spontaneous recanalization of the vasa deferentia, has also been documented. The Royal College of Obstetricians and Gynaecologists states there is a generally agreed-upon rate of late failure of about one in 2000 vasectomies— better than tubal ligations for which the failure rate is one in every 200 to 300 cases. A 2005 review including both early and late failures described a total of 183 recanalizations from 43,642 vasectomies (0.4%), and sixty pregnancies after 92,184 vasectomies (0.07%).
Short-term possible complications include infection, bruising and bleeding into the scrotum resulting in a collection of blood known as a hematoma. A study in 2012 demonstrated an infection rate of 2.5% postvasectomy. The stitches on the small incisions required are prone to irritation, though this can be minimized by covering them with gauze or small adhesive bandages. The primary long-term complications are chronic pain conditions or syndromes that can affect any of the scrotal, pelvic or lower-abdominal regions, collectively known as post-vasectomy pain syndrome. Though vasectomy results in increases in circulating immune complexes, these increases are transient. Data based on animal and human studies indicate these changes do not result in increased incidence of atherosclerosis. The risk of prostate and testicular cancer is not affected by vasectomy. According to one study long-term postvasectomy discomfort is experienced at a frequency which ranges between 15% and 33% of vasectomy patients.
Post-vasectomy pain syndrome (P.V.P.S.) is a chronic and sometimes debilitating condition that may develop immediately or several years after vasectomy. The most robust study of post-vasectomy pain, according to the American Urology Association’s Vasectomy Guidelines 2012 (amended 2015) found a rate of 14.7% reported new-onset scrotal pain at 7 months after vasectomy with 0.9% describing the pain as “quite severe and noticeably affecting their quality of life”. The pain can be constant orchialgia or epididymal pain (epididymitis), or it can be pain that occurs only at particular times such as with sexual intercourse, ejaculation, or physical exertion.
Approximately 90% are generally reported in reviews as being satisfied with having had a vasectomy, while 7–10% of men regret their decision. Regret was less common when both people in the relationship agreed on the procedure.
Men who are of a younger age at the time of having a vasectomy are significantly more likely to regret and seek a reversal of their vasectomy, with one study showing men for example in their twenties being 12.5 times more likely to undergo a vasectomy reversal later in life (and including some who chose sterilization at a young age); prevasectomy counseling is therefore of particular importance in younger patients.
An association between vasectomy and primary progressive aphasia, a rare variety of frontotemporal dementia, was reported. However, it is unclear if there is a causal relationship. The putative mechanism is a cross-reactivity between brain and sperm, including the shared presence of neural surface antigens. In addition, the cytoskeletal tau protein has been found only to exist outside of the CNS in the manchette of sperm.
The traditional incision approach of vasectomy involves numbing of the scrotum with local anesthetic (although some men’s physiology may make access to the vas deferens more difficult in which case general anesthesia may be recommended) after which a scalpel is used to make two small incisions, one on each side of the scrotum at a location that allows the surgeon to bring each vas deferens to the surface for excision. The vasa deferentia are cut (sometimes a section may be removed altogether), separated, and then at least one side is sealed by ligating (suturing), cauterizing (electrocauterization), or clamping.There are several variations to this method that improve healing, effectiveness, and which help mitigate long-term pain such as post-vasectomy pain syndrome (PVPS) or epididymitis.
The following vasectomy methods have purportedly had a better chance of later reversal but have seen less use by virtue of known higher failure rates (i.e., recanalization). An earlier clip device, the VasClip, is no longer on the market, due to unacceptably high failure rates.
The VasClip method, though considered reversible, has had a higher cost and resulted in lower success rates. Also, because the vasa deferentia are not cut or tied with this method, it could technically be classified as other than a vasectomy. Vasectomy reversal (and the success thereof) was conjectured to be higher as it only required removing the Vas-Clip device. This method achieved limited use, and scant reversal data are available.
Both vas occlusion techniques require the same basic patient setup: local anesthesia, puncturing of the scrotal sac for access of the vas, and then plug or injected plug occlusion. The success of the aforementioned vas occlusion techniques is not clear and data are still limited. Studies have shown, however, that the time to achieve sterility is longer than the more prominent techniques mentioned in the beginning of this article. The satisfaction rate of patients undergoing IVD techniques has a high rate of satisfaction with regard to the surgery experience itself.
Sexual intercourse can usually be resumed in about a week (depending on recovery); however, pregnancy is still possible as long as the sperm count is above zero. Another method of contraception must be relied upon until a sperm count is performed either two months after the vasectomy or after ten to twenty ejaculations have occurred.
After a vasectomy, contraceptive precautions must be continued until azoospermia is confirmed. Usually two semen analyses at three and four months are necessary to confirm azoospermia. The British Andrological Society has recommended that a single semen analysis confirming azoospermia after sixteen weeks is sufficient.
In order to allow the possibility of reproduction via artificial insemination after vasectomy, some men opt for cryopreservation of sperm before sterilization. It is advised that all men having a vasectomy consider freezing some sperm before the procedure. Dr Allan Pacey (senior lecturer in andrology at Sheffield University and secretary of the British Fertility Society) notes that men who he sees for a vasectomy reversal which has not worked, express wishing they knew they could have stored sperm. Pacey notes, “The problem is you’re asking a man to foresee a future where he might not necessarily be with his current partner—and that may be quite hard to do when she’s sitting next to you.”
The cost of cryo-preservation (sperm banking) may also be substantially less than alternative vaso-vasectomy procedure(s), compared to the costs of in-vitro fertilization which usually run to $15,000.
Intracytoplasmic sperm injection: Sperm can be aspirated from the testicles or the epididymis, and while there is not enough for successful artificial insemination, there is enough to fertilize an ovum by ICSI This avoids the problem of antisperm antibodies and may result in a faster pregnancy. IVF (In-vitro fertilization) may be less costly (see aforementioned text) per cycle than reversal in some health-care systems, but a single I.V.F. cycle is often insufficient for conception. Disadvantages include the need for procedures on the woman, and the standard potential side-effects of I.V.F. for both the mother and the child.
Although men considering vasectomies should not think of them as reversible, and most men and their partners are satisfied with the operation, life circumstances and outlooks can change, and there is a surgical procedure to reverse vasectomies using vasovasostomy (a form of microsurgery first performed by Earl Owen in 1971). Vasovasostomy is effective at achieving pregnancy in a variable percentage of cases, and total out-of-pocket costs in the United States are often upwards of $10,000. The typical success rate of pregnancy following a vasectomy reversal is around 55% if performed within 10 years, and drops to around 25% if performed after 10 years. After reversal, sperm counts and motility are usually much lower than 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 sperm cells of men who have undergone vasectomy reversal may lead to a higher rate of birth defects.
Some reasons that men seek vasectomy reversals include wanting a family with a new partner following a relationship break-down/divorce, their original wife/partner dying and subsequently going on to repartner and to want children, the unexpected death of a child, or a long-standing couple changing their minds some time later, often prompted by situations such as improved finances or existing children approaching the age of school or leaving home. Patients often comment that they never anticipated the possibility of a relationship break-down or death (of their partner or child), or how that may affect their situation at the time of having their vasectomy. A small number of vasectomy reversals are also performed in attempts to relieve postvasectomy pain syndrome.
Internationally, vasectomy rates are vastly different. While female sterilisation is the most widely used method worldwide, with 223 million women relying on it, only 28 million women rely on their partner’s vasectomy. In the world’s 69 least developed countries less than 0.1% of men use vasectomies on average. Of 54 African countries, only ten report measurable vasectomy use and only Swaziland, Botswana, and South Africa exceed 0.1% prevalence.
|Canada||22%||“of all women rely on vasectomy”|
|UK||17% – 21%||only range given|
|New Zealand||17% to 21%||only range given|
|South Korea||17% to 21%||only range given|
In North America and Europe vasectomy usage is on the order of 10% with some countries reaching 20%. Despite its high efficacy, in the United States, vasectomy is utilized less than half the rate of the alternative female tubal ligation. According to the research, vasectomy in the US is least utilized among black and Latino populations, the groups that have the highest rates of female sterilization.
New Zealand, in contrast, has higher levels of vasectomy than tubal ligation. 18% of all men, and 25% of all married men, have had a vasectomy. The age cohort with the highest level of vasectomy was 40–49, where 57% of men had taken it up. Canada, the UK, Bhutan and the Netherlands all have similar levels of uptake.