A 66 year old man is being admitted with the diagnosis of intestinal obstruction. His medical history shows he had bladder surgery 7 years ago for bladder cancer. He also received postoperative radiation therapy at that time.
My question is: Could there be some link connecting the intestinal obstruction now and the bladder cancer including actions taken to correct it then? Obstruction of the bowel may be caused by ileus -- in which the bowel doesn't function correctly but there is no "mechanical" (anatomic) problem -- or by mechanical causes.
Mechanical obstruction occurs when movement of material through the intestines is physically blocked. The mechanical causes of obstruction are numerous and may include the following:
Hernias
Postoperative adhesions or scar tissue
Impacted feces (stool)
Gallstones
Tumors blocking the intestines
Granulomatous processes (abnormal tissue growth)
Intussusception
Volvulus (twisted intestine)
Foreign bodies (ingested materials that obstruct the intestines)
If the obstruction blocks the blood supply to the intestine, the tissue may die, causing infection and gangrene. Risk factors for tissue death include intestinal malignancy , Crohn's disease , hernia , and previous abdominal surgery.
Surgery is by far the most widely used treatment for bladder cancer. It is used for all types and stages of bladder cancer. Several different types of surgery are used. Which type is used in any situation depends largely on the stage of the tumor. Many surgical procedures are available today that have not gained widespread acceptance. They can be difficult to perform, and good outcomes are best achieved by those who perform many of these surgeries per year. The types of surgery are as follows:
Transurethral resection with fulguration: In this operation, an instrument (resectoscope) is inserted through the urethra and into the bladder. A small wire loop on the end of the instrument then removes the tumor by cutting it or burning it with electrical current (fulguration). This is usually performed for the initial diagnosis of bladder cancer and for the treatment of stages Ta and T1 cancers. Often, after transurethral resection, additional treatment is given (for example, intravesical therapy) to help treat the bladder cancer.
Radical cystectomy: In this operation, the entire bladder is removed, as well as its surrounding lymph nodes and other structures that may contain cancer. This is usually performed for cancers that have at least invaded into the muscular layer of the bladder wall or for more superficial cancers that extend over much of the bladder or that have failed to respond to more conservative treatments. Occasionally, the bladder is removed to relieve severe urinary symptoms.
Segmental or partial cystectomy: In this operation, part of the bladder is removed. This is usually performed for solitary low-grade tumors that have invaded the bladder wall but are limited to a small area of the bladder.
As the name implies, radical cystectomy is major surgery. Not only the entire bladder but also other structures are removed.
In men, the prostate and seminal vesicles (small tubes that carry semen from the prostate to the penis) are removed. This operation stops production of semen and may affect your sexual function. However, nerve-sparing techniques can spare erectile function in some men after surgery.
In women, the womb (uterus), ovaries, and part of the vagina are removed. This permanently stops menstruation, and you can no longer become pregnant. The operation may also interfere with sexual and urinary functions.
Removal of the bladder is complicated because it requires creation of a new pathway for urine to leave the body. This is called urinary diversion. Some people wear a bag outside their body to collect urine. Others have a small pouch made inside the body to collect urine. The pouch is usually made by a surgeon from a small piece of the intestine. Most patients (both men and women) are candidates for continent urinary tract reconstruction so that volitional (voluntary) voiding may be restored.
Surgeons and medical oncologists are working together to find ways to avoid radical cystectomy. A combination of chemotherapy and radiation therapy may allow some patients to preserve their bladder; however, the toxicity of the therapy is significant, with many patients requiring surgery to remove the bladder at a later date.
If your urologist recommends surgery as treatment for your bladder cancer, be sure you understand the type of surgery you will have and what effects the surgery will have on your life.
Even if the surgeon believes that the entire cancer is removed by the operation, many people who undergo surgery for bladder cancer receive chemotherapy after the surgery. This "adjuvant" chemotherapy is designed to kill any cancer cells remaining after surgery and to increase the chance of a cure.
Some patients may receive chemotherapy before radical cystectomy. This is called "neoadjuvant" chemotherapy and may be recommended by your surgeon and oncologist. Neoadjuvant chemotherapy can kill any microscopic cancer cells that may have spread to other parts of the body and can also shrink the tumor in your bladder before surgery.
If it has been decided that you need chemotherapy in conjunction with your radical cystectomy, the decision to elect neoadjuvant or adjuvant chemotherapy will be made together on a case-by-case basis by the patient, medical oncologist, and urologic oncologist. the obstruction could be due to adhesions caused by his previous operation. |
