What is Interstitial cystitis?
Interstitial cystitis (IC) is a chronic pelvic pain disorder. It is characterized by irritation or inflammation of the bladder wall. The main symptom of this condition is recurring pain or discomfort in the bladder and pelvic region.
The symptoms and severity of IC vary greatly among individuals. Most researchers believe that IC is caused by several diseases rather than a single disease. The condition is typically chronic, rather than acute or progressive, which means that symptoms do not typically become worse over time, but remain constant. In women, symptoms of IC can become more severe before or during menstruation.
Although the cause of IC remains unknown, some researchers theorize that the condition is an autoimmune response to the triggering factors of a urinary tract infection. Others speculate that interstitial cystitis may occur when the bladder wall becomes damaged and allows irritants in the urine to penetrate its deeper layers. Heredity may also be a factor in developing the condition.
Some symptoms of IC resemble the symptoms typically caused by a bacterial infection of the bladder. However, medical tests have found no bacteria present in the urine of IC patients. In addition, IC patients are unresponsive to antibiotics, which are usually effective in treating bacterial infections.
Previously, interstitial cystitis cases were mainly classified as either ulcerative or nonulcerative, depending on whether ulcers had formed on the patient's bladder wall. However, there is much debate over whether this classification is useful.
Most IC cases are nonulcerative and factors, such as the capacity of the bladder or the presence of mast cells have greater influence on treatment decisions. These elements can be obtained when the bladder is measured and examined while under anesthesia. Mast cells in the tissues of the bladder may indicate an allergic or autoimmune reaction. In some cases, the success or failure of treatments (e.g., whether IC responds to dietary changes) may help characterize the type of interstitial cystitis.
There is no diagnostic test that exclusively identifies IC at this time. Tests that may be performed include a variety of diagnostic tests, including urine tests and cystoscopy, a procedure that uses a lighted scope to view the inside of the urethra and bladder.
According to the National Institute of Diabetes and Digestive and Kidney Diseases, around 1.3 million Americans are estimated to have this condition. Women account for 90 percent of cases. Researchers are working to identify the cause of this condition and develop less-invasive diagnostic techniques.
Treatment options for interstitial cystitis
Symptoms of Interstitial cystitis
- Pelvic pain and pressure.
- Urgent need to urinate (sometimes 60 to 80 times a day) and burning during urination.
- Sensation of incomplete emptying of the bladder.
- Pain during sexual intercourse.
- Vaginal and rectal pain (sometimes).
It is recommended that patients experiencing symptoms of interstitial cystitis (IC) notify their physician. Diagnosis of the condition typically begins with a complete medical history. Patients will be asked to describe their symptoms including how long they have experienced them and their severity. Patients also may be asked to answer a short questionnaire called the Pelvic Pain Urgency/Frequency (PUF) survey to help the physician identify if the pelvic pain is coming from the bladder. In some cases, the patient will be instructed to maintain a written record detailing the frequency of fluid intake and urination (bladder diary), also known as an intake and output log. A pelvic examination will be part of the evaluation for female patients.
The symptoms of interstitial cystitis closely resemble those of other urinary system disorders, and no diagnostic test can conclusively identify IC in patients. For these reasons, IC is considered a diagnosis of exclusion. Physicians must rule out conditions such as endometriosis, sexually transmitted diseases (e.g., herpes), urinary tract infection, kidney stones, bladder cancer, irritable bowel syndrome (IBS) and others before diagnosing interstitial cystitis. It is important to note that some conditions, such as endometriosis, can coexist with IC. Physicians will use appropriate diagnostic tests to determine which conditions may be present in addition to IC.
To exclude other conditions and diagnose IC, physicians typically use urine tests including a urine culture, a prostate secretion culture (in men) and procedures such as cystoscopy. During a cystoscopy, the patient is anesthetized while the physician uses a hollow, lighted tube with several lenses (cystoscope) to view the inside of the bladder and urethra. At this time, a liquid (generally saline) is released into the bladder to stretch (distend) the organ to its limits. Cystoscopy can detect inflammation, thickness and stiffness of the bladder wall and the presence of Hunner's ulcers. These are large sores in the bladder wall, which occur in only 5 to 10 percent of cases.
When the bladder is completely distended, areas of pinpoint bleeding, known as glomerulations, may be identified. The physician may also choose to remove a tissue sample (biopsy) at this time to confirm if inflammation is present and rule out the possibility of bacterial infections and bladder cancer.
The KCL test is another diagnostic procedure that some physicians may use to test for interstitial cystitis and evaluate a patient's potential response to treatments such as medications that work on the bladder lining. For the KCL test, a catheter is used to fill the bladder with a potassium chloride solution. The solution may reveal deficiencies in the layer of the bladder wall. However, the test is painful and may be only 60 to 75 percent accurate. The KCL test is not widely used to diagnose IC.
On average, individuals with IC typically experience symptoms for approximately four years before being definitively diagnosed with the condition, according to the Mayo Clinic. Patients are diagnosed with IC when:
- Urinary frequency, urgency and/or pain in the bladder, pelvic area or genitalia are present.
- Cystoscopy results confirm that the bladder wall is inflamed and Hunner's ulcers or glomerulations are present.
- Other conditions that could cause the symptoms have been ruled out.
How is interstitial cystitis treated?
There is no cure for interstitial cystitis (IC) at this time. Even when symptoms dissipate, they may still recur weeks, months or years later. The following treatment methods, however, may provide symptom relief for patients:
Lifestyle modificationPatients can often reduce IC symptoms by making certain lifestyle modifications, such as quitting smoking, performing gentle stretching exercises and resting when pain is severe. It may also be helpful to limit consumption of the following foods and beverages, which may contribute to irritation and inflammation of the bladder:
- Acidic foods (e.g., tomatoes, pineapple)
- Artificial sweeteners
- Caffeinated beverages
- Citrus beverages
Bladder trainingSome patients have found adequate IC pain relief by practicing bladder training techniques. Bladder training methods vary, but basically the patient decides to empty her bladder at predetermined times. Individuals also may use distractions and relaxation techniques to accommodate their bladder training. Gradually, the length between scheduled periods of urination is increased. Patients may choose to track their progress in a diary.
Transcutaneous electrical nerve stimulation (TENS)Some IC patients obtain relief with TENS, a procedure in which mild pulses of electricity enter the patient's body through electrodes placed on the lower back or just above the pubic region. These electrical impulses may be administered through special devices placed inside a woman's vagina or a man's rectum as well. Although the effect of TENS on IC is not fully understood, scientists suspect that the pulses of electricity may:
- Increase blood flow to the patient's bladder
- Strengthen the patient's pelvic muscles, which help control bladder function
- Trigger the release of pain-blocking substances
Oral medicationsThe Food and Drug Administration (FDA) approved the first oral medication for interstitial cystitis in 1996. The drug, pentosan polysulfate sodium (Elmiron), improved interstitial cystitis symptoms in 38 percent of patients who were treated in clinical trials, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Patients taking pentosan polysulfate sodium may not experience relief from IC pain for the first two to four months, and urinary frequency may not decrease for up to six months. The main side effect of this treatment is minor gastrointestinal discomfort. It works by regenerating or protecting the superficial layer that lines the bladder. It prevents the painful substances from getting to the muscle and nerve layer.
Physicians may also recommend over-the-counter medications, such as aspirin and ibuprofen, for IC-related discomfort or pain. Antidepressants and antihistamines have also helped improve urinary symptoms in some patients. Opioid analgesics (e.g. acetaminophen with codeine) or longer-acting opioids may be prescribed for patients with severe IC pain. Patients should always consult their physician before taking a new medication.
Bladder instillationA catheter is guided through the patient's urethra into the bladder, where it passes a measured amount of a drug called dimethyl sulfoxide (DMSO). DMSO is held for about 10 to 15 minutes on average before being expelled from the patient's bladder. Treatments are administered every one to two weeks for a total of six to eight weeks, and repeated as necessary. This procedure, also called a bladder bath or wash, takes place in a physician's office.
Physicians believe that DMSO works in many ways. Because the drug penetrates the bladder wall, it may be more effective in reaching the tissue to reduce swelling and block pain. DMSO may also prevent the muscles from contracting, thereby reducing urinary frequency, urgency and pain. Patients who receive bladder instillation must have certain blood tests, such as kidney and liver function tests and a complete blood count (CBC) approximately every six months. Some patients experience a garlic-like taste and odor on their breath and skin, which typically disappears 72 hours after treatment.
Other treatments are being investigated for similar use. However, DSMO is the only treatment of its kind currently approved by the FDA for use in IC patients
Bladder hyperdistentionThe physician stretches the bladder to full capacity by filling it with a gas or liquid while the patient is under anesthesia. Some patients experience marked improvement in IC symptoms after this procedure is administered during a diagnostic cystoscopy. However, this form of treatment is not ideal because it requires anesthesia and helps only a small number of patients.
Although researchers are unsure why this procedure sometimes helps alleviate IC symptoms, some believe that the procedure may increase the bladder's capacity and interrupt the pain signals transmitted by the bladder's nerves. IC symptoms may become worse 24 to 48 hours after this procedure. However, they should return to normal or improve within two to four weeks of distention.
SurgerySurgery for IC should be considered only if pain is debilitating and all other treatments have failed. Most physicians are reluctant to operate on IC patients because the outcome of the surgery cannot be predicted and symptoms may persist after surgery. Patients considering surgery for IC are encouraged to speak to the physician and family members about the potential benefits, risks and side effects as well as any short- and long-term complications that may occur. Surgery for IC requires anesthesia, hospitalization and a recovery period that can last anywhere from weeks to months. Surgical procedures to reduce IC symptoms include:
- Fulguration. A procedure in which a cystoscope (a hollow, lighted tube with several lenses) is inserted through the patient's urethra and electricity or a laser is used to burn off Hunner's ulcers (large sores in the bladder wall). After the area heals, the ulcers and dead tissue fall off, leaving healthy, new tissue in their place.
- Resection. A procedure in which a cystoscope is inserted through the patient's urethra, allowing the physician to cut around and remove any ulcers that may be present.
- Augmentation. A procedure that enlarges the bladder by removing inflamed and damaged sections of the bladder and rebuilding the organ with tissue from the patient's small or large intestine. After the patient's incisions heal, urinary frequency may diminish. The effect of augmentation on IC pain varies significantly, and the condition may recur on the portion of intestine used to rebuild the bladder.
- Neuromodulation. This is a surgical variation of TENS, in which small electrodes are permanently implanted beneath the skin in the patient's lower back next to the third sacral nerve root. If test stimulation is successful, a permanent battery is implanted beneath the skin for stimulations at regular intervals. Although neuromodulation has proven to be a very effective form of symptom relief for some patients, its results are not always lasting and the treatment is still in the pre-clinical trial testing phase. Therefore, neuromodulation is not available to the general public at this time.
- Cystectomy. The surgical removal of the bladder. Following a cystectomy, the body needs another method of storing and removing urine. Therefore, a urostomy is typically performed. During this procedure, the ureters are attached to a portion of the patient's colon, which opens onto the skin of the abdomen. Urine then empties through this opening, called a stoma, into a bag located outside of the patient's body.
Some physicians employ another technique, which also requires a stoma, but permits urine to be stored in a pouch located inside the patient's abdomen. The patient then inserts a catheter into the stoma to empty the pouch at certain intervals each day. The stoma must be kept very clean to avoid infection. A third method, which is practiced by very few physicians, involves creating a new bladder by attaching a portion of the patient's colon to the urethra. After the patient heals, the new bladder can be emptied by urinating at scheduled times or placing a catheter inside the urethra. Some patients continue to experience phantom IC pain after a cystectomy.
Tofranil (Imipramine), Motrin (Ibuprofen), Soma (Carisoprodol)
- Elimination of caffeine-containing beverages, alcohol, artificial sweeteners, spicy foods, citrus fruits and tomatoes in the diet may help relieve symptoms.
- A bland diets helps some patients.
What might complicate it?
Scar tissue from chronic inflammation may cause the bladder to stiffen and contract, reducing bladder capacity from twelve ounces to two ounces. Other complications include reflux of urine (urine is forced back up the ureter to the kidney), chronic pelvic pain, and depression (resulting from decreased quality of life due to constant urinary symptoms and pain).
Although a cure is not yet available, new treatment options are proving effective in long-term relief of bladder pain and discomfort associated with interstitial cystitis.
Urologist, internist, gynecologist, and infectious disease specialist.
Last updated 4 July 2021