MEDLINEplus Health Information: Return to home page   A service of the National Library of Medicine: Go to NLM home page
Search     Advanced Search    Site Map    About MEDLINEplus    Home
Health Topics: conditions, diseases and wellness Drug Information: generic and brand name drugs Dictionaries: spellings and definitions of medical terms Directories: doctors, dentists and hospitals Other Resources: organizations, libraries, publications, MEDLINE

Medical Encyclopedia

Disease     Injury     Nutrition     Poison     Special     Surgery     Symptoms     Tests

Abdominal Quadrants
Body 2, back view
Body 3, side view
Kidney - blood and urine flow
Kidney anatomy
Tuberculosis in the kidney
 
Overview   Symptoms   Treatment   Prevention   

Pyelonephritis

Alternative names:

acute pyelonephritis; complicated urinary tract infection; infection of the kidney; kidney infection; urinary tract infection - complicated

Definition:

An infection of the kidney and the ducts that carry urine away from the kidney (ureters).

Causes, incidence, and risk factors:

Pyelonephritis can be further classified according to the extent and severity of damage to the kidneys. Types include:

Pyelonephritis most commonly occurs as a result of urinary tract infection (cystitis), particularly in the presence of transient (occasional) or persistent backflow of urine from the bladder into the ureters or kidney pelvis (vesicoureteric reflux ).

Although cystitis (bladder infection) is common, pyelonephritis occurs much less often. The incidence of pyelonephritis is approximately 3 to 7 out of 10,000 people. The risk is increased if there is a history of cystitis, renal papillary necrosis, kidney stones, vesicoureteric reflux, or obstructive uropathy. The risk is also increased when there is a history of chronic or recurrent urinary tract infection, and when the infection is caused by a particularly virulent bacteria.

Acute pyelonephritis can be severe in the elderly and in people who are immunosuppressed (for example, those with cancer or AIDS).


Adam

The information provided herein should not be used for diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Copyright 2000 adam.com, Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Health Topics | Drug Information | Dictionaries | Directories | Other Resources