Definition Of Fever Of Unknown Origin Research Articles

Update on Fever of Unknown Origin in Children: Focus on Etiologies and Clinical Approach.

Fever of unknown origin (FUO) can be caused by four etiological categories of diseases. The most common cause of FUO in children is represented by infections, followed by inflammatory conditions and neoplastic causes; a decreasing quote remains still without diagnosis. Despite the fact that several diagnostic and therapeutic approaches have been proposed since the first definition of FUO, none of them has been fully validated in pediatric populations. A focused review of the patient's history and a thorough physical examination may offer helpful hints in suggesting a likely diagnosis. The diagnostic algorithm should proceed sequentially, and invasive testing should be performed only in select cases, possibly targeted by a diagnostic suspect. Pioneering serum biomarkers have been developed and validated; however, they are still far from becoming part of routine clinical practice. Novel noninvasive imaging techniques have shown promising diagnostic accuracy; however, their positioning in the diagnostic algorithm of pediatric FUO is still not clear. This narrative review aims to provide a synopsis of the existent literature on FUO in children, with its major causes and possible diagnostic workup, to help the clinician tackle the complex spectrum of pediatric FUO in everyday clinical practice.

Fever of unknown origin in children: A challenge persisting with advancing medical care

Although huge advances have been made in the field of medicine, fever of unknown origin (FUO) continues to be a significant health problem and an important cause of morbidity and mortality, especially in children. The aim of this study was to study current spectrum of FUO, newly emerging challenges and outcome of FUO. A prospective observational study was conducted over a 16 month period (May 2012-September 2013). 53 children aged 4 months to 15 years met the definition of FUO and were included. Children with known immunodeficiency disorders or other chronic disorders were excluded. A diagnosis was reached in 47 (88.7%) patients. Infections were the commonest cause accounting for FUO in 37 (69.8%) patients. Haematological disorders were found in 8 (15%) and autoimmune diseases in 2 (3.8%) patients. Among infections, the most common causes of FUO were tuberculosis (TB) (37.8%), enteric fever (29.7%), Epstein-Barr virus (EBV) (8.1%) and brucellosis (8.1%). TB was extra-pulmonary in 11 cases and pulmonary in 3 cases. Amongst the haematological disorders, 3 patients had haemophagocytic lymphohistiocytosis (HLH), 3 had leukemia, 1 had non-Hodgkin lymphoma and 1 had autoimmune lymphoproliferative syndrome. Juvenile idiopathic arthritis with systemic onset and polyarteritis nodosa accounted for the two cases of autoimmune disease. Elevated C-reactive protein (CRP) levels were associated with an infectious etiology. Bone tenderness, thrombocytopenia and neutropenia predicted haematological malignancy. 1 patient of HLH died of complications during initial hospitalization and 3 other patients (1 HIV, 2 TB) died on follow up. TB, especially extrapulmonary, and enteric fever are still significant public health problems and were the commonest causes of FUO in our population. Due to advances in diagnostic facilities, some diseases like urinary tract infection (UTI) and hepatitis have become less common; however, other diseases like EBV have become more common causes of FUO. HLH is emerging as a significant cause of morbidity and mortality in FUO patients.

Fieber unklarer Genese im 21. Jahrhundert

Fever of unknown origin (FUO) is a rare but important disease. The definition of FUO has not changed in the last 50 years. Classical FUO is defined by an illness of at least 3 weeks duration with fever greater than 38 masculine C, and no established diagnosis after 1 week of hospital investigation. The causes of FUO can be divided in four categories: infectious diseases, noninfectious inflammatory diseases, neoplasms, and others (miscellaneous). Recent studies have surprisingly shown that despite improved diagnostic procedures the percentage of patients with FUO, in which no diagnosis after intensive investigations in specialized centres can be found, has increased. However, finding the correct diagnosis in FUO is essential for these patients for psychological and vital reasons. Therefore and because of economic reasons patients with FUO should be investigated in specialized centres with a department for rheumatology and infectious diseases.

Fever of unknown origin responding to steroid therapy.

It is not uncommon to find cases of fever of unknown origin (FUO) in which no final diagnosis is made ever after various examinations. We investigated such cases of undiagnosed FUO, with fever persisting for a long periods and responding to steroid therapy. Among 4,596 patients who were hospitalized over 3-year period from September 1991, 25 met Petersdorf's definition of FUO. Among these 25 patient, six cases were steroid-responsive undiagnosed FUO (SR-FUO). Patients with SR-FUO had the following characteristics: marked inflammatory findings and severe illness; without a definite underlying disease being found despite various examinations; no findings which indicated any known diseases such as adult-onset Still's disease, polymyalgia rheumatica, or other collagen diseases; elderly onset, at 58 to 77 years of age (mean age: 67 years); no improvement with antibiotics, antituberculous agents, or antimycotic drugs; significant improvement of symptoms and signs with steroid therapy; and a relatively good prognosis. SR-FUO, which is not caused by any known disease and is highly responsive to steroids, is included among the FUO cases which we have difficulty in diagnosing and treating.