science

Infantile apnea

Infantile apnea 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 Infantile apnea rather than just read about it. In short: Infantile apnea is a rare disease that is characterized by cessation of breathing in an infant for at least 20 seconds or a shorter respiratory pause that is associated with a slow heart rate, bluish discolouration of the skin, extreme paleness, gagging, choking and/or decreased muscle tone. Infantile apnea occurs in children under the age of one and it is more common in premature infants.

Key takeaways

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

Reference excerpt

Infantile apnea is a rare disease that is characterized by cessation of breathing in an infant for at least 20 seconds or a shorter respiratory pause that is associated with a slow heart rate, bluish discolouration of the skin, extreme paleness, gagging, choking and/or decreased muscle tone. Infantile apnea occurs in children under the age of one and it is more common in premature infants. Symptoms of infantile apnea occur most frequently during the rapid eye movement (REM) stage of sleep. The nature and severity of breathing problems in patients can be detected in a sleep study called a polysomnography which measures the brain waves, heartbeat, body movements and breathing of a patient overnight. Infantile apnea can be caused by developmental problems that result in an immature brainstem or it can be caused other medical conditions. As children grow and develop, infantile apnea usually does not persist. Infantile apnea may be related to some cases of sudden infant death syndrome (SIDS) however, the relationship between infantile apnea and SIDS is not known.

Causes Having a family history of sleep apnea. Being overweight or obese. Having certain medical conditions (cerebral palsy, Down syndrome, sickle cell disease, abnormalities in the skull or face) Being born with a low birth weight. Having a large tongue.

Diagnosis

Classification There are three major categories of apnea known as central, obstructive, and mixed apnea.

Central Apnea Central apnea is characterized by insufficient responsiveness from respiratory centers such as the medulla, which results in poor coordination of the body systems that are necessary for breathing. Respiratory muscles and nerves to lose the ability to effectively receive and process signals from the brain causing respiratory efforts to cease. Central apnea is quite common and can be found in healthy, full-term infants for short periods of time before breathing patterns in the infant stabilize. In premature infants, central apnea is attributed to an underdeveloped respiratory system which results in decreased response to higher carbon dioxide levels and difficulty breathing. Head trauma may also cause central apnea as it interferes with normal signalling of the central respiratory system, this might be present in infants who suffer from abuse so investigating patient background is an important consideration.

Obstructive Apnea Obstructive apnea occurs when the airway passages are obstructed and little to no air exchange occurs, resulting in impaired breathing. In some cases, it occurs when patients are born with a small airway opening. Patients with obstructive apnea often have vigorous inspiratory effort but the efforts are still ineffective. Normally, the muscles at the level of the throat relax and dilate while asleep in order to open up airway however, patients with obstructive apnea may have decreased neuromuscular tone of the muscles responsible for dilating the pharynx during sleep. The inability of the vocal cords to move and the presence of a foreign body may also cause obstructive apnea. Cases of obstructive apnea are rarely found in infants that are healthy.

Mixed Apnea Mixed apnea is a combination of both central and obstructive factors. The majority of premature infants with sleep apnea have mixed apnea.

Epidemiology When infants have a lower birth weight or younger gestational age, there is a greater risk of infantile apnea. With the advancement of neonatal intensive care units and the greater technology available, there are more successful premature births compared to the past. With the greater number of premature infants being born, there is also a greater number of children with infantile apnea. Approximately 85 percent of infants born with a weight less than 2.2 pounds (1 kg) experience infantile apnea within the first month after birth. This risk decreases to 25 percent for infants weighing less than 5.5 pounds (2.5 kg). Studies have found that almost 2% of the pediatric population experience obstructive sleep apnea.

References

Worked examples

Example 1 — a first encounter with Infantile apnea

Start with the simplest possible case. Write down what Infantile apnea 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 Infantile apnea 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 Infantile apnea 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 Infantile apnea

In research: Infantile apnea 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 Infantile apnea 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: Infantile apnea is common in secondary-school and first-year university syllabi. It links to neighbouring topics Breathing abnormalities, Pediatrics, Sleep disorders, so understanding it makes those chapters shorter.
In everyday life: Look for Infantile apnea 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 Infantile apnea in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Infantile apnea 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 Infantile apnea out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Infantile apnea in simple terms?

Why does Infantile apnea 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 Infantile apnea?

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 Infantile apnea.