Fevers of unknown origin (FUO)

Mind Map by LewisLewis, updated more than 1 year ago
Created by LewisLewis over 5 years ago


Infectious diseases Mind Map on Fevers of unknown origin (FUO), created by LewisLewis on 07/25/2014.

Resource summary

Fevers of unknown origin (FUO)
1 With increasing duration of fever of unknown origin, decreases the probability that it is caused by an infection
2 Non-fever
2.1 Most frequently found in young women
2.2 It does not exceed 37.5° (axillary measurement)
2.3 No pathological significance, with physiological accentuation of the physiological circadian rhythm
3 Triggered fever
3.1 Frequently observed in children or adolescents of both sexes
3.2 Found in individuals with special behavioral characteristics such as hypersensitivity, fragility, but also cunning and temerity
3.3 Motivating factor is usually a difficult moment in school or family
4 Fever of unknown origin (FUO)
4.1 Definition
4.1.1 Temperature > 38.3°C
4.1.2 Fever lasting > 3 weeks
4.1.3 Failure of any attempt to justify the diagnosis of febrile symptoms after a week research hospital
4.2 Causes
4.2.1 Infectious Extrapulmonary tuberculosis Malaria Mononucleosic syndromes Endocarditis Fungal infections
4.2.2 Non infectious Hematologic malignancies Solid tumors Immunological diseases Granulomatous diseases Extensive tissue necrosis with resorption of pyrogenic substances (heart attacks, pulmonary thromboembolism) Hemorrhage Hemolysis Replacement diseases and metabolic diseases Endocrinopathies Hypersensitivity to drugs Direct, local stimulation, of the thermoregulatory centers (eg. tumor or cerebral hemorrhage)
4.3 The most useful and fast criterion is the anamnesis, with the search and evaluation of the symptomatology, followed by the 1st level examinations
4.4 Classification
4.4.1 Classical T > 38.3° Duration of > 3 wk Evaluation of ≥ 3 visits or 3 d in hospital Leading causes Cancer Infections Inflammatory conditions Undiagnosed
4.4.2 Nosocomial Leading causes Nosocomial infections (e.g. from C. difficile) Postoperative complications Drug-induced fever Deep vein thrombosis (DVT) Characteristics T > 38.3° Patient hospitalized ≥ 24h, fever not present or incubating on admission Evaluation of at least 3 d
4.4.3 Neutropenic (immune deficient) Common agents involved Bacteria Fungi (Candida and Aspergillus) Characteristics T > 38.3° Absolute neutrophil count ≤ 500 per mm3 Evaluation of at least 3 d
4.4.4 HIV associated Causes Majority due to opportunistic infections Mycobacteria, CMV, toxoplasma, Pneumocystis jirovecii, Cryptococcus Tumors IRIS HIV infection itself Characterized by fever, rash and lymphadenopathy in 40-70% of patients Fever is either continuous or recurrent The use of HAART has reduced the incidence of HIV-associated FUO Characteristics T > 38.3° Duration of > 4 wk for outpatients, > 3 d for inpatients HIV infection confirmed
4.5 Opportunistic infections
4.5.1 The relative frequency of each cause of FUO is influenced by many factors, such as: Counts of CD4+ Viral load Geographical context and local prevalence of certain infectious agents
4.6 Diagnosis
4.6.1 Anamnesis At first you should exclude the 3 minor causes of FUO Factitious fever: assess the fever personally Usual hypertermia: establish an appropriate thermal curve Drug-induced fever
4.6.2 Physical evaluation Associated symptoms Fever + rash: Rickettsial, borreliosis Fever + jaundice: hepatitis, colangitis Fever + lymphadenopathy: HIV, EBV, CMV, lymphoma Fever + diarrhea: HIV, intestinal parasites Fever + urinary frequency/dysuria/stranguria: UTI Fever + pain: localized abscess Fever + pathological pulmonary examination: TB Fever + localized or diffuse myoarthralgias: borreliosis Fundoscopical evaluation Infectious endocarditis HIV (HIV retinopathy) CMV (CMV retinitis is the most common retinal infection in patients with advanced HIV infection) Toxoplasmosis Cryptococcosis Skin lesions or mucous membrane lesions Abnormal masses Enlarged masses Painful points
4.6.3 Lab and instrumental examinations First-level exams Blood count with formula Study of lymphocyte subsets (CD4+, CD8+) Standard urinalysis (with evaluation of the sediment) Inflammatory indices Markers of organ function Indicators of immunologic disorders Multi-test Merieux QuantiFERON, Mantoux test with tuberculin PPD Cultures and serological tests Full serology for hepatitis virus infection Second-level exams Third-level exams (invasive) Biopsies Endoscopy (gastroscopy, colonoscopy, broncos copy with BAL) Exploratory laparoscopy
4.6.4 Ex adiuvantibus diagnosis
5 Evaluation of the type of fever
5.1 Malaria: rarely typical with prophylaxis
5.2 Cyclic neutropenia
5.2.1 Fever and neutropenia every 21 days
5.3 Horgkin's disease
5.4 Familial Mediterranean fever (FMF)
5.4.1 Familiarity, association with sierositis
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