Fever of unknown origin (FUO) 원인불명열(FUO)

Definition of unexplained fever

oral_tem_s.jpg Photo 8-6.

Take your temperature to see if you have a fever.

A fever of unknown cause is known as fever when the fever continues to occur in children for 8 days or longer, and in adults for 3 weeks or longer, but the obvious cause of the fever is not found by examination findings and the first clinical examination.
It is also defined as an unknown fever or an unknown fever),
A fever of at least 38.3°C (101°F) or higher in 14 days lasting for at least 4 hours, and at least 4 or more times of that fever is sometimes defined as an unexplained fever.
sauce; Emergency Pediatrics, A guide to ambulatory care, 5th edi. Roger M. Barkin, Peter Rosen, p.245
It is also defined differently.
Causes of unexplained fever
Fever is diagnosed as unexplained fever when a fever continues for 3 weeks or more in adults and 8 days or more in children, but the cause of fever is not found even after diligently searching for the cause.
Fever when the cause of the fever is found in the hospital for 7 days and the cause is not found is sometimes diagnosed as a fever of unknown cause.
When It looks for the cause of the fever for more than 3 weeks outside the hospital, it is called an unknown fever when I cannot find the cause of the fever.
fever-unknown-origin-1s.jpg Figure 37.
If the fever persists for 8 days or more (for children), or continues for 3 weeks or longer (for adults) without being able to clearly determine the cause of the fever from the first examination findings and clinical examination.
In this case, it can be defined as a fever of unknown cause.
Vol. 21 Children and Adolescents Home ∙ School Nursing References and Sources-11.
Diagnosis of fever of unknown origin If the fever continues for 8 to 2 weeks, and the cause of the fever is not clearly found even after the past medical history, family history, current medical history, symptoms, signs, examination findings, etc.
are synthesized and appropriate clinical tests are performed, it is called an unknown fever.
These unexplained columns are defined in several ways.
Tuberculosis, other infectious diseases, cancer, leukemia, A fever can be caused by a urinary tract infection.
Even if you repeat appropriate examinations and clinical tests to find out why you have a fever when you have such a disease, you may not be able to make a diagnosis for the first time.
Infected with Salmonella from pet turtles or snakes and contracted Salmonella infectious disease,
After eating poorly managed melon or watermelon,
you can become infected with Salmonella and get a Salmonella infectious disease.
When suffering from these infectious diseases,
the diagnosis may not be made for the first few days, and the diagnosis may be made with unexplained fever.
Malaria, which is only prevalent in that region when traveling to a certain region or country,
Rocky Mountain spotted fever Q
You can get a fever for more than 8 days due to a specific infectious disease in a specific area, such as fever.
Some people are diagnosed with unexplained fever because they do not know whether they have such a disease and have not been able to make a diagnosis for the first time.
After eating raw milk, you can get Brucellosis disease and have a fever for more than 8 days.
After eating uncooked food, you can get infectious diseases such as larval organ transfer syndrome and intestinal sputum,
and you may continue to have a fever for more than 8 days.
Twenty percent of unexplained fevers can go away spontaneously without knowing the cause of the fever, even if you try to find the cause of the fever.
80% of unexplained fevers in children and adolescents are caused by infectious diseases or diseases such as:

Viral (sex) infectious disease
Brucella disease
Jagjit adverb
Tularemia
Appendicitis and resulting abscess
osteomyelitis
Combustion rheumatoid arthritis
Inflammatory enteritis
malignant tumor
Meningitis that is not completely cured
Kawasaki disease
Cat scratch disease
endocarditis
urinary tract infection
Other Treatment of unexplained fever If you have a fever and get sick a lot, you should be admitted to the hospital and have repeated checkups to diagnose.
Sometimes the appropriate clinical tests also need to be repeated several times.
Sometimes, parents may complain that their child has a fever even though they don’t actually get a fever when they take the child’s temperature incorrectly, read the temperature incorrectly, or take a fever with the wrong thermometer.
If their child doesn’t actually have a fever, but your child has a fever, you can misdiagnose it as a fever of unknown cause.
The type of fever you have all day, or for a week or two during that time, is helpful in diagnosing the disease that causes the fever.
That’s why parents need to measure and record the heat at home.
If you feel like your child has a fever for a long time, you should check your child temperature first to see if your child really had a fever.
After being admitted to the hospital, you can find out more about your your child past and present medical history, measure your child’s body temperature directly by a nurse, etc., and repeat medical examinations several times to diagnose an unexplained fever.
CBC blood test, erythrocyte sedimentation rate (ESR) test, antinuclear antibody (ANA), C-reactive protein, Anti-streptolysin O level test (ASO level/Streptolysin), urine chemistry test and urine bacterial culture test, liver function test, chest X-ray, other types of a blood test, blood, cerebrospinal fluid, urine, feces, etc.
By doing a bacterial culture test and a tuberculin skin reaction test to find out if there is tuberculosis, you can diagnose which tuberculosis infectious disease or other diseases other than the infectious disease cause fever in any part of the body.
Sometimes some of these clinical tests are repeated several times.
If you suspect rheumatoid fever or juvenile rheumatoid arthritis, Erythrocyte sed rate/ESR test, Antinuclear Antibody/ANA test, C-reactive protein, Test for antistritolysin O (ASO) titer, etc.
Antinuclear antibody tests and rheumatoid factor tests are valuable for diagnosing juvenile rheumatoid arthritis, and antinuclear antibody tests are useful for diagnosing systemic lupus erythematosus.
Diagnosing unexplained fever like this really requires a lot of pediatric science.
Unexplained fever is one of the challenging clinical health problems, so it can be evaluated by a good doctor if properly handled.
In general, symptoms can be treated with antipyretic analgesics or anti-inflammatory drugs such as aspirin, acetaminophen (Tylenol under the trade name Acetaminophen), or “Ibuprofen” until the disease-causing fever of unknown cause is clearly diagnosed.
As long as you don’t.
If the result of the urine chemistry test and urine bacterial culture test is abnormal when there is a fever of unknown cause, use a renal ureter, bladder ultrasound, etc. to determine whether there is posterior urethral valve obstruction, bladder ureter reflux, kidney disease, or urinary tract infection.
If appendicitis, peritonitis, or abscess in the abdominal cavity are suspected, an intraperitoneal CT scan can be done.
You may get a fever due to vasculitis caused by Kawasaki disease.
In that case, it is diagnosed by performing an appropriate test to diagnose the disease.
If the CBC blood test is abnormal and you have a fever or leukemia is suspected, a bone marrow puncture test and a bone marrow bacterial culture test may be done.
Other rare diseases such as fungal intrathoracic lymphadenitis, pneumonia, sarcoidosis, and histoplasmosis may cause unexplained fever.
It can be diagnosed by suspicion of such a disease and by performing appropriate tests to diagnose it.
[Parents should also be at least a half-doctors-Encyclopedia of Child and Family Nursing]-Vol. 7 Pediatric Infectious Diseases-See column of unknown cause urinalysis_chemical_s.jpg Photo 38.
If necessary, a urine chemistry test and a urine bacterial culture test are also performed.
Figure 39. Bacterial culture tests are also performed with urine, blood, feces, cerebrospinal fluid, etc. as needed.
Sometimes repeated tests.