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Reumatologia/Rheumatology
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2/2005
vol. 43
 
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LIST DO REDAKCJI/LETTER TO THE EDITOR
Etiology of enhanced body temperature in patients admitted due to fever of unknown origin: analysis of 100 consecutive cases

Aneta Franczak-Drygalska
,
Katarzyna Jankiewicz-Ziobro
,
Anna Kotulska
,
Eugeniusz J. Kucharz

Ru 2005; 43, 2: 103-104
Data publikacji online: 2005/04/28
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Dear Sirs,

Fever can be defined as a body temperature higher than 38.3°C [2]. Regular temperature should be 36.6°C but it can fluctuate depending on the place and time of measurement. An increase in temperature may be due to many internal and external factors. Fever-inducing substances are called pyrogens. The most common pyrogens are bacterial endotoxins, cytokines such as interleukin-1, tumor necrosis factor-a, interleukin-6 and interferons. Common occurrence of these pyrogens is the reason why fever is one of the most common symptom in adult patients in outpatient clinics. Most cases of febrile conditions are easy to diagnose. Careful history taking and physical examinations are enough to know the cause of the fever. Sometimes fever higher than 38.3°C on several occasions lasted at least 3 weeks without detectable etiology and then it is called fever of unknown origin (FUO).

FUO was described for the first time by Petersdorf [7]. Later the FUO definition was modified by Durack and Street [3] who classified FUO into four types: classic, nosocomial, immune deficiency-related, and human immunodeficiency virus-related. The definition and etiology of the latter three types is rather well-known and it is difficult to consider them as FUO. Classic FUO is the most common type of FUO in inpatients and outpatients. The most common causes of the classic FUO are infections, malignancy and systemic diseases of the connective tissue (so-called collagen diseases).

The study was designed to analyze cases of fever in patients hospitalized in the Department of Internal Medicine and Rheumatology, Medical University of Silesia in Katowice admitted with a preliminary diagnosis of FUO.

One hundred consecutive cases of patients with classic FUO admitted from January 1, 2004 to June 30, 2004 were analyzed. The group consisted of 26 men and 74 women. Patients with neutropenia, HIV infection and those with nosocomial infections were excluded from the study.

The cause of FUO was revealed in 95 patients, and the remaining 5 ones were diagnosed as FUO after hospitalization. Table 1 summarizes causes of fever in our patients.

Systemic inflammatory connective tissue diseases were the most common cause of FUO in patients referred to the hospital as FUO (35%) in the investigated patients. Together with vasculitis they account for almost half of the patients. The cause of...


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