science

Periodic fever, aphthous stomatitis, pharyngitis and adenitis

Periodic fever, aphthous stomatitis, pharyngitis and adenitis is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Periodic fever, aphthous stomatitis, pharyngitis and adenitis rather than just read about it. In short: Periodic fever, aphthous stomatitis, pharyngitis and adenitis syndrome is a medical condition, typically occurring in young children, in which high fever occurs periodically at intervals of about 3–5 weeks, frequently accompanied by aphthous-like ulcers, pharyngitis and cervical adenitis (cervical lymphadenopathy). The syndrome was described in 1987 and named two years later.

Key takeaways

Periodic fever, aphthous stomatitis, pharyngitis and adenitis belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Periodic fever, aphthous stomatitis, pharyngitis and adenitis to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Periodic fever, aphthous stomatitis, pharyngitis and adenitis from memory before moving on to harder problems.

Reference excerpt

Periodic fever, aphthous stomatitis, pharyngitis and adenitis syndrome is a medical condition, typically occurring in young children, in which high fever occurs periodically at intervals of about 3–5 weeks, frequently accompanied by aphthous-like ulcers, pharyngitis and cervical adenitis (cervical lymphadenopathy). The syndrome was described in 1987 and named two years later.

Signs and symptoms The key symptoms of PFAPA are those in its name: periodic high fever at intervals of about 3–5 weeks, as well as aphthous ulcers, pharyngitis and adenitis. In between episodes, and even during the episodes, the children appear healthy. At least 6 months of episodes.

Cause The cause of PFAPA is unknown. It is frequently discussed together with other periodic fever syndromes. Possible causes include primarily genetic factors or it may be due to an initial infection. The condition appears to be the result of a disturbance of innate immunity. The changes in the immune system are complex and include increased expression of complement related genes (C1QB, C2, SERPING1), interleukin-1-related genes (interleukin-1β, interleukin 1 RN, CASP1, interleukin 18 RAP) and interferon induced (AIM2, IP-10/CXCL10) genes. T cell associated genes (CD3, CD8B) are down regulated. Flares are accompanied by increased serum levels of activated T lymphocyte chemokines (IP-10/CXCL10, MIG/CXCL9), G-CSF and proinflammatory cytokines (interleukin 6, interleukin 18). Flares also manifest with a relative lymphopenia. Activated CD4+/CD25+ T-lymphocyte counts correlated negatively with serum concentrations of IP-10/CXCL10, whereas CD4+/HLA-DR+ T lymphocyte counts correlated positively with serum concentrations of the counterregulatory IL-1 receptor antagonist.

Diagnosis

Diagnosis requires recurrent negative throat cultures and that other causes (such as EBV, CMV, FMF) be excluded.

Treatment PFAPA syndrome typically resolves spontaneously. Treatment options are used to lessen the severity of episodes. These treatments are either medical or surgical: One treatment often used is a dose of a corticosteroid at the beginning of each fever episode. A single dose usually ends the fever within several hours. However, in some children, they can cause the fever episodes to occur more frequently. Interleukin-1 inhibition appears to be effective in treating this condition. There has been some evidence for the use of medications to reduce the frequency of flare-ups, including colchicine and cimetidine. Surgical removal of the tonsils appears to be beneficial compared to no surgery in symptom resolution and number of future episodes. However, the evidence to support surgery is of moderate quality. Children with PFAPA have an impaired quality of life, which may be treated via individual counseling.

Prognosis According to present research, PFAPA does not lead to other diseases and spontaneously resolves as the child gets older, with no long term physical effects.

However, PFAPA has been found in adults and may not spontaneously resolve. Children with PFAPA experience lower physical, emotional, and psychosocial functioning. Their performance in school is also substantially impacted.

References

External links

Worked examples

Example 1 — a first encounter with Periodic fever, aphthous stomatitis, pharyngitis and adenitis

Start with the simplest possible case. Write down what Periodic fever, aphthous stomatitis, pharyngitis and adenitis claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Periodic fever, aphthous stomatitis, pharyngitis and adenitis before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Periodic fever, aphthous stomatitis, pharyngitis and adenitis ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Periodic fever, aphthous stomatitis, pharyngitis and adenitis

In research: Periodic fever, aphthous stomatitis, pharyngitis and adenitis appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Periodic fever, aphthous stomatitis, pharyngitis and adenitis in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Periodic fever, aphthous stomatitis, pharyngitis and adenitis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Autoinflammatory syndromes, Fever, Otorhinolaryngology, so understanding it makes those chapters shorter.
In everyday life: Look for Periodic fever, aphthous stomatitis, pharyngitis and adenitis outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Periodic fever, aphthous stomatitis, pharyngitis and adenitis in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Periodic fever, aphthous stomatitis, pharyngitis and adenitis means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Periodic fever, aphthous stomatitis, pharyngitis and adenitis out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Periodic fever, aphthous stomatitis, pharyngitis and adenitis in simple terms?

Why does Periodic fever, aphthous stomatitis, pharyngitis and adenitis matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Periodic fever, aphthous stomatitis, pharyngitis and adenitis?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Periodic fever, aphthous stomatitis, pharyngitis and adenitis.