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Pelvic inflammatory disease

Pelvic inflammatory disease (or disorder) (PID) is a generic term for infection of the female uterus, fallopian tubes, and/or ovaries as it progresses to scar formation with adhesions to nearby tissues and organs. This may lead to tissue necrosis with/or without abscess formation. Pus can be released into the peritoneum. 2/3 of patients with laparoscopic evidence of previous PID were not aware they had had PID (Cecil's 5th ed). PID is often associated with, because it is a common result of infection with, sexually transmitted diseases. PID is a vague term and can also refer to viral, or fungal, or parasitic, but usually with bacterial infections. more...

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PID should be classified by affected organs, the stage of the infection, and the organism(s) causing it. Although very commonly a sexually transmitted infection is the likely cause, other routes are possible for some agents including lymphatic, often postpartum, postabortal (either miscarriage or abortion) or IUD related, and hematogenous spread.

Epidemiology

In the United States, more than one million women are affected by PID each year, and the rate is highest with teenagers. Approximately 50,000 women become infertile in the US each year from PID . N. gonorrhoea is isolated in only 40-60% of women with acute salpingitis (current obgyn 9th ed 2003). C. trachomatis was estimated by current obgyn 9th ed to be the cause in about 60% of cases of , which may lead to PID. It is unsure how much is due to a single organism and how much is due to multiple organisms; many other pathogens that are in normal vaginal flora become involved in PID. 10% of women in one study had asymptomatic Chlamydia trachomatis infection and 65% had asymptomatic infection with Neisseria gonorrhoeae (current obgyn 9th ed.) It was noted in one study that 10-40% of untreated women with N. gonorrhoea develop PID and 20-40% of women infected with C. trachomitis developed PID.(Cecil's essentials of medicine 5th ed.). "PID is the leading cause of infertility. A single episode of PID results in infertility in 13% of women." (Cecil's 5th ed.) This rate of infertility increases with each infection.

Diagnosis

There may be no actual symptoms of PID. If there are symptoms, fever, cervical motion tenderness, lower abdominal pain, new or different discharge, painful intercourse, or irregular menstrual bleeding may be noted. It is important to note that PID can occur and cause serious harm without causing any noticeable symptoms. Laparoscopic idenitification is helpful in diagnosing tubal disease, 65-90% positive predictive value in patients with presumed PID (current obgyn 9th ed 2003). Regular STD testing is important for prevention. Treatment is usually started empirically because of the terrible complications. Definitive criteria include: histopathologic evidence of endometritis, thickened filled fallopian tubes, or laparoscopic findings. Gram-stain/smear becomes important in identification of rare and possibly more serious organisms (cecil's 5th ed.).

Prognosis

Although the PID infection itself may be cured, effects of the infection may be permanent. This makes early identification by someone who can prescribe appropriate curative treatment so important in the prevention of damage to the reproductive system. Since early gonococcal infection may be asymptomatic, regular screening of individuals at risk for common agents (history of multiple partners, history of any unprotected sex, or people with symptoms) or because of certain procedures (post pelvic operation, postpartum, miscarriage or abortion). Prevention is also very important in maintaining viable reproduction capabilities. If the initial infection is mostly in the lower tract, after treatment the person may have little difficulties. If the infection is in the fallopian tubes or ovaries, more serious complications are more likely to occur.

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Pelvic inflammatory disease
From Gale Encyclopedia of Medicine, 4/6/01 by Karen J Wells

Definition

Pelvic inflammatory disease (PID) is a term used to describe any infection in the lower female reproductive tract that spreads upward to the upper female reproductive tract. The lower female genital tract consists of the vagina and the cervix. The upper female genital tract consists of the body of the uterus, the fallopian or uterine tubes, and the ovaries.

Description

PID is the most common and the most serious consequence of infection with sexually transmitted diseases (STD) in women. Over one million cases of PID are diagnosed annually in the United States, and it is the most common cause for hospitalization of reproductive-age women. Sexually active women aged 15-25 are at highest risk for developing PID. The disease can also occur, although less frequently, in women having monogamous sexual relationships. The most serious consequences of PID are increased risk of infertility and ectopic pregnancy.

To understand PID, it is helpful to understand the basics of inflammation. Inflammation is the body's response to disease-causing (pathogenic) microorganisms. The affected body part may swell due to accumulation of fluid in the tissue or may become reddened due to an excessive accumulation of blood. A discharge (pus) may be produced that consists of white blood cells and dead tissue. Following inflammation, scar tissue may form by the proliferation of scar-forming cells and is called fibrosis. Adhesions of fibrous tissue form and cause organs or parts of organs to stick together.

PID may be used synonymously with the following terms:

  • Salpingitis (Inflammation of the fallopian tubes)
  • Endometritis (Inflammation of the inside lining of the body of the uterus)
  • Tubo-ovarian abscesses (Abscesses in the tubes and ovaries)
  • Pelvic peritonitis (Inflammation inside of the abdominal cavity surrounding the female reproductive organs).

Causes & symptoms

A number of factors affect the risk of developing PID. They include:

  • Age. The incidence of PID is very high in younger women and decreases as a woman ages.
  • Race. The incidence of PID is 8-10 times higher in nonwhites than in whites.
  • Socioeconomic status. The higher incidence of PID in women of lower socioeconomic status is due in part to a woman's lack of education and awareness of health and disease and her accessibility to medical care.
  • Contraception. Induced abortion, use of an IUD, non-use of barrier contraceptives such as condoms, and frequent douching are all associated with a higher risk of developing PID.
  • Lifestyle. High risk behaviors, such as drug and alcohol abuse, early age of first intercourse, number of sexual partners, and smoking all are associated with a higher risk of developing PID.
  • Types of sexual practices. Intercourse during menses and frequent intercourse may offer more opportunities for the admission of pathogenic organisms to the inside of the uterus.
  • Disease. 60-75% of cases of PID are associated with STDs. A prior episode of PID increases the chances of developing subsequent infections.

The two major causes of STDs are the organisms, Neisseria gonorrhoeae and Chlamydia trachomatis. The main symptom of N. Gonorrheae infection (gonorrhea) is a vaginal discharge of mucus and pus. Sometimes bacteria from the colon normally in the vaginal cavity may travel upward to infect the upper female genital organs, facilitated by the infection with gonorrhea. Infections with C. trachomatis and other nongonoccal organisms are more likely to have mild or no symptoms.

Normally the cervix produces mucus which acts as a barrier to prevent disease-causing microorganisms, called pathogens, from entering the uterus and moving upward to the tubes and ovaries. This barrier may be breached in two ways. A sexually transmitted pathogen, usually a single organism, invades the lining cells, alters them, and gains entry. Another way for organisms to gain entry happens when trauma or alteration to the cervix occurs. Childbirth, spontaneous or induced abortion, or use of an intrauterine contraceptive device (IUD) are all conditions that may alter or weaken the normal lining cells, making them susceptible to infection, usually by several organisms. During menstruation, the cervix widens and may allow pathogens entry into the uterine cavity.

Recent evidence suggests that bacterial vaginosis (BV), a bacterial infection of the vagina, may be associated with PID. BV results from the alteration of the balance of normal organisms in the vagina, by douching, for example. While the balance is altered, conditions are formed that favor the overgrowth of anaerobic bacteria, which thrive in the absence of free oxygen. A copious discharge is usually present. Should some trauma occur in the presence of anaerobic bacteria, such as menses, abortion, intercourse, or childbirth, these organisms may gain entrance to the upper genital organs.

The most common symptom of PID is pelvic pain. However, many women with PID have symptoms so mild that they may be unaware that an infection exists.

In acute salpingitis, a common form of PID, swelling of the fallopian tubes may cause tenderness on physical examination. Fever may be present. Abscesses may develop in the tubes, ovaries, or in the surrounding pelvic cavity. Infectious discharge may leak into the peritoneal cavity and cause peritonitis, or abscesses may rupture causing a life-threatening surgical emergency.

Chronic salpingitis may follow an acute attack. Subsequent to inflammation, scarring and resulting adhesions may result in chronic pain and irregular menses. Due to blockage of the tubes by scar tissue, women with chronic salpingitis suffer a high risk of having an ectopic pregnancy. The fertilized ovum is unable to travel down the fallopian tube to the uterus and implants itself in the tube, on the ovary, or in the peritoneal cavity. This condition can also be a life-threatening surgical emergency.

IUD

IUD usage has been strongly associated with the development of PID. Bacteria may be introduced to the uterine cavity while the IUD is being inserted or may travel up the tail of the IUD from the cervix into the uterus. Uterine tissue in association with the IUD shows areas of inflammation that may increase its susceptibility to pathogens.

Susceptibility to STDs

Susceptibility to STDs involves many factors, some of which are not known. The ability of the organism to produce disease and the circumstances that place the organism in the right place at a time when a trauma or alteration to the lining cells has occurred are factors. The individual's own immune response also helps to determine whether infection occurs.

Diagnosis

If PID is suspected, the physician will take a complete medical history and perform an internal pelvic examination. Other diseases that may cause pelvic pain, such as appendicitis and endometriosis, must be ruled out. If pelvic examination reveals tenderness or pain in that region, or tenderness on movement of the cervix, these are good physical signs that PID is present.

Specific diagnosis of PID is difficult to make because the upper pelvic organs are hard to reach for samplings. The physician may take samples directly from the cervix to identify the organisms that may be responsible for infection. Two blood tests may help to establish the existence of an inflammatory process. A positive C-reactive protein (CRP) and an elevated erythrocyte sedimentation rate (ESR) indicate the presence of inflammation. The physician may take fluid from the cavity surrounding the ovaries called the cul de sac; this fluid may be examined directly for bacteria or may be used for culture. Diagnosis of PID may also be done using a laparoscope, but laparoscopy is expensive, and it is an invasive procedure which carries some risk for the patient.

Treatment

The goals of treatment are to reduce or eliminate the clinical symptoms and abnormal physical findings, to get rid of the microorganisms, and to prevent long term consequences such as infertility and the possibility of ectopic pregnancy. If acute salpingitis is suspected, treatment with antibiotics should begin immediately. Early intervention is crucial to keep the fallopian tubes undamaged. The patient is usually treated with at least two broad spectrum antibiotics that can kill both N. gonorrhoeae and C. trachomatis plus other types of bacteria that may have the potential to cause infection. Hospitalization may be required to ensure compliance. Treatment for chronic PID may involve hysterectomy, which may be helpful in some cases.

If a woman is diagnosed with PID, she should see that her sexual partner is also treated to prevent the possibility of reinfection.

Alternative treatment

Alternative therapy should be complementary to antibiotic therapy. For pain relief, an experienced practitioner may apply castor oil packs, or use acupressure or acupuncture. Some herbs, such as Echinacea (Echinacea spp.) and calendula (Calendula officinalis) are believed to have antimicrobial activity and may be taken to augment the action of prescribed antibiotics. General tonic herbs, as well as good nutrition and rest, are important in recovery and strengthening after an episode of PID. Blue cohosh (Caulophyllum thalictroides) and false unicorn root (Chamaelirium luteum) are recommended as tonics for the general well-being of the female genital tract.

Prognosis

PID can be cured if the initial infection is treated immediately. If infection is not recognized, as frequently happens, the process of tissue destruction and scarring that results from inflammation of the tubes results in irreversible changes in the tube structure that cannot be restored to normal. Subsequent bouts of PID increase a woman's risks manyfold. Thirty to forty percent of cases of female infertility are due to acute salpingitis.

With modern antibiotic therapy, death from PID is almost nonexistent. In rare instances, death may occur from the rupture of tubo-ovarian abscesses and the resulting infection in the abdominal cavity. One recent study has linked infertility, a consequence of PID, with a higher risk of ovarian cancer.

Prevention

The prevention of PID is a direct result of the prevention and prompt recognition and treatment of STDs or of any suspected infection involving the female genital tract. The main symptom of infection is an abnormal discharge. To distinguish an abnormal discharge from the mild fluctuations of normal discharge associated with the menstrual cycle takes vigilance and self-awareness. Sexually active women must be able to detect symptoms of lower genital tract disease. Ideally these women will be able to have a frank dialogue regarding their sexual history, risks for PID, and treatment options with their physicians. Also, these women should have open discussions with their sexual partners regarding disclosure of significant symptoms of possible infection.

Lifestyle changes should be geared to preventing the transfer of organisms when the body's delicate lining cells are unprotected or compromised. Barrier contraceptives, such as condoms, diaphragms, and cervical caps should be used. Women in monogamous relationships should use barrier contraceptives during menses and take their physician's advice regarding intercourse following abortion, childbirth, or biopsy procedures.

Key Terms

Adhesion
The joining or sticking together of parts of an organ that are not normally joined together.
C-reactive protein (CRP)
A protein present in blood serum in various abnormal states, like inflammation.
Ectopic
Located away from normal position; ectopic pregnancy results in the attachment and growth of the fertilized egg outside of the uterus, a life-threatening condition.
Endometriosis
The presence and growth of functioning endometrial tissue in places other than the uterus; often results in severe pain and infertility.
Erythrocyte sedimentation rate (ESR)
The rate at which red blood cells settle out in a tube of unclotted blood, expressed in millimeters per hour; elevated sedimentation rates indicate the presence of inflammation.
Fibrosis
The formation of fibrous, or scar, tissue which may follow inflammation and destruction of normal tissue.
Hysterectomy
Surgical removal of the uterus.

Laparoscope
A thin flexible tube with a light on the end which is used to examine the inside of the abdomen; the tube is inserted into the abdomen by way of a small incision just below the navel.

Further Reading

For Your Information

    Books

  • Kurman, Robert J., ed. Blaustein's Pathology of the Female Genital Tract. New York: Springer-Verlag, 1994.
  • Landers, D.V., and R. L. Sweet, eds. Pelvic Inflammatory Disease. New York: Springer, 1997.

    Other

  • Pelvic Inflammatory Disease. Fact Sheet (November 1997). National Institute of Allergy and Infectious Diseases. National Institutes of Health, Bethesda, MD 20892. www.niaid.nih.gov/factsheets/stpid.htm (8 Dec. 1997).
  • Pelvic Inflammatory Disease. Onhealth (1997). www.healthnet.ivi.com (17 Dec. 1997).

Gale Encyclopedia of Medicine. Gale Research, 1999.

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