|Classification and external resources|
Urinary incontinence (UI), involuntary urination, is any involuntary leakage of urine. It can be a common and distressing problem, which may have a profound impact on quality of life. Urinary incontinence almost always results from an underlying treatable medical condition but is under-reported to medical practitioners. Enuresis is often used to refer to urinary incontinence primarily in children, such as nocturnal enuresis (bed wetting) 
- 1 Causes
- 2 Pathophysiology
- 3 Diagnosis
- 4 Treatment
- 5 Quantification
- 6 In children
- 7 History
- 8 References
- 9 External links
The most common types of urinary incontinence in women are stress urinary incontinence and urge urinary incontinence. Women with both problems have mixed urinary incontinence. Stress urinary incontinence is caused by loss of support of the urethra which is usually a consequence of damage to pelvic support structures as a result of childbirth. It is characterized by leaking of small amounts of urine with activities which increase abdominal pressure such as coughing, sneezing and lifting. Additionally, frequent exercise in high-impact activities can cause athletic incontinence to develop. Urge urinary incontinence is caused by uninhibited contractions of the detrusor muscle. It is characterized by leaking of large amounts of urine in association with insufficient warning to get to the bathroom in time.
- Polyuria (excessive urine production) of which, in turn, the most frequent causes are: uncontrolled diabetes mellitus, primary polydipsia (excessive fluid drinking), central diabetes insipidus and nephrogenic diabetes insipidus. Polyuria generally causes urinary urgency and frequency, but doesn't necessarily lead to incontinence.
- Caffeine or cola beverages also stimulate the bladder.
- Enlarged prostate is the most common cause of incontinence in men after the age of 40; sometimes prostate cancer may also be associated with urinary incontinence. Moreover drugs or radiation used to treat prostate cancer can also cause incontinence.
- Disorders like multiple sclerosis, spina bifida, Parkinson's disease, strokes and spinal cord injury can all interfere with nerve function of the bladder.
Continence and micturition involve a balance between urethral closure and detrusor muscle activity. Urethral pressure normally exceeds bladder pressure, resulting in urine remaining in the bladder. The proximal urethra and bladder are both within the pelvis. Intraabdominal pressure increases (from coughing and sneezing) are transmitted to both urethra and bladder equally, leaving the pressure differential unchanged, resulting in continence. Normal voiding is the result of changes in both of these pressure factors: urethral pressure falls and bladder pressure rises.
Patients with incontinence should be referred to a medical practitioner specializing in this field. Urologists specialize in the urinary tract, and some urologists further specialize in the female urinary tract. A urogynecologist is a gynecologist who has special training in urological problems in women. Family physicians and internists see patients for all kinds of complaints, and are well trained to diagnose and treat this common problem. These primary care specialists can refer patients to urology specialists if needed.
A careful history taking is essential especially in the pattern of voiding and urine leakage as it suggests the type of incontinence faced. Other important points include straining and discomfort, use of drugs, recent surgery, and illness.
The physical examination will focus on looking for signs of medical conditions causing incontinence, such as tumors that block the urinary tract, stool impaction, and poor reflexes or sensations, which may be evidence of a nerve-related cause.
A test often performed is the measurement of bladder capacity and residual urine for evidence of poorly functioning bladder muscles.
Other tests include:
- Stress test – the patient relaxes, then coughs vigorously as the doctor watches for loss of urine.
- Urinalysis – urine is tested for evidence of infection, urinary stones, or other contributing causes.
- Blood tests – blood is taken, sent to a laboratory, and examined for substances related to causes of incontinence.
- Ultrasound – sound waves are used to visualize the kidneys, ureters, bladder, and urethra.
- Cystoscopy – a thin tube with a tiny camera is inserted in the urethra and used to see the inside of the urethra and bladder.
- Urodynamics – various techniques measure pressure in the bladder and the flow of urine.
Patients are often asked to keep a diary for a day or more, up to a week, to record the pattern of voiding, noting times and the amounts of urine produced.
- Stress incontinence, also known as effort incontinence, is due essentially to insufficient strength of the pelvic floor muscles to prevent the passage of urine, especially during activities that increase intra-abdominal pressure, such as coughing, sneezing, or bearing down.
- Urge incontinence is involuntary loss of urine occurring for no apparent reason while suddenly feeling the need or urge to urinate.
- Overflow incontinence: Sometimes people find that they cannot stop their bladders from constantly dribbling or continuing to dribble for some time after they have passed urine. It is as if their bladders were constantly overflowing, hence the general name overflow incontinence.
- Mixed incontinence is not uncommon in the elderly female population and can sometimes be complicated by urinary retention, which makes it a treatment challenge requiring staged multimodal treatment.
- Structural incontinence: Rarely, structural problems can cause incontinence, usually diagnosed in childhood (for example, an ectopic ureter). Fistulas caused by obstetric and gynecologic trauma or injury are commonly known as obstetric fistulas and can lead to incontinence. These types of vaginal fistulas include, most commonly, vesicovaginal fistula and, more rarely, ureterovaginal fistula. These may be difficult to diagnose. The use of standard techniques along with a vaginogram or radiologically viewing the vaginal vault with instillation of contrast media.
- Functional incontinence occurs when a person recognizes the need to urinate but cannot make it to the bathroom. The loss of urine may be large. There are several causes of functional incontinence including confusion, dementia, poor eyesight, mobility or dexterity, unwillingness to toilet because of depression or anxiety or inebriation due to alcohol. Functional incontinence can also occur in certain circumstances where no biological or medical problem is present. For example a person may recognise the need to urinate but may be in a situation where there is no toilet nearby or access to a toilet is restricted.
- Nocturnal enuresis is episodic UI while asleep. It is normal in young children.
- Transient incontinence is a temporary version of incontinence. It can be triggered by medications, adrenal insufficiency, mental impairment, restricted mobility, and stool impaction (severe constipation), which can push against the urinary tract and obstruct outflow.
- Giggle incontinence is an involuntary response to laughter. It usually affects children.
- Double incontinence. There is also a related condition for defecation known as fecal incontinence. Due to involvement of the same muscle group (levator ani) in bladder and bowel continence, patients with urinary incontinence are more likely to have fecal incontinence in addition. This is sometimes termed "double incontinence".
- Post-void dribbling is the phenomenon where urine remaining in the urethra after voiding the bladder slowly leaks out after urination.
Bladder symptoms affect women of all ages. However, bladder problems are most prevalent among older women. Up to 35% of the total population over the age of 60 years is estimated to be incontinent, with women twice as likely as men to experience incontinence. One in three women over the age of 60 years are estimated to have bladder control problems.
Bladder control problems have been found to be associated with higher incidence of many other health problems such as obesity and diabetes. Difficulty with bladder control results in higher rates of depression and limited activity levels.
Incontinence is expensive both to individuals in the form of bladder control products and to the health care system and nursing home industry. Injury related to incontinence is a leading cause of admission to assisted living and nursing care facilities. More than 50% of nursing facility admissions are related to incontinence.
Coital incontinence (CI) is urinary leakage that occurs during either penetration or orgasm and can occur with a sexual partner or with masturbation. It has been reported to occur in 10% to 24% of sexually active women with pelvic floor disorders.
Men tend to experience incontinence less often than women, and the structure of the male urinary tract accounts for this difference. It is common with prostate cancer treatments. Both women and men can become incontinent from neurologic injury, congenital defects, strokes, multiple sclerosis, and physical problems associated with aging.
While urinary incontinence affects older men more often than younger men, the onset of incontinence can happen at any age. Recent estimates by the National Institutes of Health (NIH) suggest that 17 percent of men over age 60, an estimated 600,000 men, experience urinary incontinence, with this percentage increasing with age. Incontinence is treatable and often curable at all ages.
Incontinence in men usually occurs because of problems with muscles that help to hold or release urine. The body stores urine—water and wastes removed by the kidneys—in the urinary bladder, a balloon-like organ. The bladder connects to the urethra, the tube through which urine leaves the body.
During urination, Detrusor muscles in the wall of the bladder contract, forcing urine out of the bladder and into the urethra. At the same time, sphincter muscles surrounding the urethra relax, letting urine pass out of the body. Incontinence will occur if the bladder muscles suddenly contract (detrusor muscle) or muscles surrounding the urethra suddenly relax (sphincter muscles).
The treatment options range from conservative treatment, behavior management, bladder retraining, pelvic floor therapy, medications and surgery. The success of treatment depends on the correct diagnoses in the first place.
One of the most common treatment recommendations includes exercising the muscles of the pelvis. Kegel exercises may strengthen a portion of the affected area. According to many industry specialists, the pelvic floor is actually a group of muscles and connective tissues running side-to-side and front to back along the bony ridges of the pelvis. To understand this is better to visualize the pelvic floor as a 'hammock' or 'bowl'. For everything to be working properly, this hammock should be broken out like every other muscle in the body. Kegel exercises to strengthen or retain pelvic floor muscles and sphincter muscles can reduce stress leakage. Patients younger than 60 years old benefit the most. The patient should do at least 24 daily contractions for at least 6 weeks. Increasingly there is evidence of the effectiveness of pelvic floor muscle exercise to improve bladder control. For example, urinary incontinence following childbirth can be improved by performing those pelvic floor muscle exercises.
A more recently developed exercise technique suitable only for women involves the use of a set of five small vaginal cones of increasing weight. For this exercise, the patient simply places the small plastic cone within her vagina, where it is held in by a mild reflex contraction of the pelvic floor muscles. Because it is a reflex contraction, little effort is required on the part of the patient. This exercise is done twice a day for fifteen to twenty minutes, while standing or walking around, for example doing daily household tasks or simply walking at home to improve pelvic muscle exercise. As pelvic floor muscles get stronger, cones of increasing weight can be used, thereby strengthening the muscles gradually. The advantage of this method is that the correct muscles are automatically exercised by holding in the cone, and floor muscles start to become stronger within two to three weeks, and light to medium stress incontinence can resolve after eight to twelve weeks of use.
Biofeedback uses measuring devices to help the patient become aware of his or her body's functioning. By using electronic devices or diaries to track when the bladder and urethral muscles contract, the patient can gain control over these muscles. Biofeedback can be used with pelvic muscle exercises and electrical stimulation to relieve stress and urge incontinence.
Time voiding while urinating and bladder training are techniques that use biofeedback. In time voiding, the patient fills in a chart of voiding and leaking. From the patterns that appear in the chart, the patient can plan to empty his or her bladder before he or she would otherwise leak. Biofeedback and muscle conditioning, known as bladder training, can alter the bladder's schedule for storing and emptying urine. These techniques are effective for urge and overflow incontinence
A 2013 randomized controlled trial found no benefit of adding biofeedback to pelvic floor muscle exercise in stress urinary incontinence, but observing improvements in both groups.[non-primary source needed] In another randomized controlled trial the addition of biofeedback to the training of pelvic floor muscles for the treatment of stress urinary incontinence, improved pelvic floor muscle function, reduced urinary symptoms, and improved of the quality of life.[non-primary source needed]
A number of medications exist to treat incontinence including: fesoterodine, tolterodine and oxybutynin. While a number appear to have a small benefit, the risk of side effects are a concern. For every ten or so people treated only one will become able to control their urine and all medication are of similar benefit.
Surgery may be used to alleviate incontinence only after other treatments have been tried. Many surgical options have high rates of success. Urodynamic testing seems to confirm that surgical restoration of vault prolapse can cure motor urge incontinence.
The procedure of choice for stress urinary incontinence in females is what is called a sling procedure. A sling usually consists of a synthetic mesh material in the shape of a narrow ribbon but sometimes a biomaterial (bovine or porcine) or the patients own tissue that is placed under the urethra through one vaginal incision and two small abdominal incisions. The idea is to replace the deficient pelvic floor muscles and provide a backboard of support under the urethra.
The tension-free transvaginal tape(TVT)
The tension-free transvaginal tape(TVT) sling procedure treats urinary stress incontinence by positioning a polypropylene mesh tape underneath the urethra. The 20-minute outpatient procedure involves two miniature incisions and has an 86-95% cure rate. Complications, such as bladder perforation, can occur in the retropubic space if the procedure is not done correctly. This minimally invasive procedure is a common treatment for stress urinary incontinence.
The transobturator tape (TOT)
The transobturator tape (TOT) sling procedure aims to eliminate stress urinary incontinence by providing support under the urethra. This minimally-invasive procedure eliminates retropubic needle passage and involves inserting a mesh tape under the urethra through three small incisions in the groin area. While the procedure has shown risks during its infancy, recent developments have increased the cure rate to 90%.
The mini-sling procedure also known as TVT-Secure. The reported short term cure rates of the TVT-Secure ranged from 67% to 83%.
The needleless sling
The needleless sling is a single incision TOT. It is implanted via one unique incision. The needleless has approximately 136% more surface area than the mini sling, which may better support the pelvic floor and urethra, and no sharp instruments are required to implant the sling besides the scalpel used to make the incision, which may enhance patient comfort.
The readjustable sling
The readjustable sling consists of a standard synthetic mesh sling combined with sutures that attach to an implantable tensioning device that resides permanently under the skin in the abdominal wall. Once implanted, this Readjustable Mechanical External (REMEEX) device can be re-accessed under local anesthesia to fine tune the sling should incontinence reappear months or years after the initial surgery.
Most stress incontinence in women results from the bladder dropping down toward the vagina. Therefore, common surgery for stress incontinence involves pulling the bladder up to a more normal position. Working through an incision in the vagina or abdomen, the surgeon raises the bladder and secures it with a string attached to muscle, ligament or bone. For severe cases of stress incontinence, the surgeon may secure the bladder with a wide sling. This not only holds up the bladder but also compresses the bottom if the bladder and the top of the urethra, further preventing leakage.
The Marshall-Marchetti-Krantz (MMK) procedure, also known as retropubic suspension or bladder neck suspension surgery, is performed by a surgeon in a hospital setting. Developed in 1949 by doctors Victor F. Marshall (urologist), Andrew A. Marchetti (OB/GYN), and Kermit E. Krantz (OB/GYN) is the standard by which new procedures are measured. The patient is placed under general anesthesia, and long, thin, flexible tube (catheter) is inserted into the bladder through the narrow tube (urethra) that drains the body's urine. An incision is made across the abdomen, and the bladder is exposed. The bladder is separated from surrounding tissues. Stitches (sutures) are placed in these tissues near the bladder neck and urethra. The urethra is then lifted, and the sutures are attached to the pubic bone itself, or to tissue (fascia) behind the pubic bone. The sutures support the bladder neck, helping the patient gain control over urine flow. Approximately 85% of women who undergo the Marshall-Marchetti-Krantz procedure are cured of their stress incontinence.
Men also can use an external urine collection device that is worn around the penis. There are two principal types. The traditional type is referred to as a condom or Texas catheter. These are not appropriate for men who are uncircumcised, have large or small anatomy or those who have retracted anatomy. Condom catheter users frequently experience complications including urinary tract infections and skin breakdown. A recent innovation is the Men's Liberty that attaches only to the tip of the penis with safe hydrocolloid adhesive and works with all types and sizes of male anatomy. There has not been a confirmed UTI or serious skin injury caused by Men's Liberty.
Hospitals often use some type of incontinence pad, a small but highly absorbent sheet placed beneath the patient, to deal with incontinence or other unexpected discharges of bodily fluid. These pads are especially useful when it is not practical for the patient to wear a diaper.
The most common form of urine management in hospitals is indwelling or Foley catheters. These catheters may cause infection and other associated secondary complications.
Research projects that assess the efficacy of anti-incontinence therapies often quantify the extent of urinary incontinence. The methods include the 1-h pad test, measuring leakage volume; using a voiding diary, counting the number of incontinence episodes (leakage episodes) per day; assessing of the strength of pelvic floor muscles, measuring the maximum vaginal squeeze pressure.
Urination, or voiding, is a complex activity. The bladder is a balloonlike muscle that lies in the lowest part of the abdomen. The bladder stores urine, then releases it through the urethra, the canal that carries urine to the outside of the body. Controlling this activity involves nerves, muscles, the spinal cord and the brain.
The bladder is made of two types of muscles: the detrusor, a muscular sac that stores urine and squeezes to empty, and the sphincter, a circular group of muscles at the bottom or neck of the bladder that automatically stay contracted to hold the urine in and automatically relax when the detrusor contracts to let the urine into the urethra. A third group of muscles below the bladder (pelvic floor muscles) can contract to keep urine back.
A baby's bladder fills to a set point, then automatically contracts and empties. As the child gets older, the nervous system develops. The child's brain begins to get messages from the filling bladder and begins to send messages to the bladder to keep it from automatically emptying until the child decides it is the time and place to void.
Failures in this control mechanism result in incontinence. Reasons for this failure range from the simple to the complex.
Incontinence happens less often after age 5: About 10 percent of 5-year-olds, 5 percent of 10-year-olds, and 1 percent of 18-year-olds experience episodes of incontinence. It is twice as common in girls as in boys.
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