biology

Neonatal encephalopathy

Neonatal encephalopathy is a biology 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 Neonatal encephalopathy rather than just read about it. In short: Neonatal encephalopathy (NE), previously known as neonatal hypoxic-ischemic encephalopathy (neonatal HIE or NHIE), is defined as a encephalopathy syndrome with signs and symptoms of abnormal neurological function, in the first few days of life in an infant born after 35 weeks of gestation. In this condition there is difficulty initiating and maintaining respirations, a subnormal level of consciousness, and associate…

Key takeaways

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

Reference excerpt

Neonatal encephalopathy (NE), previously known as neonatal hypoxic-ischemic encephalopathy (neonatal HIE or NHIE), is defined as a encephalopathy syndrome with signs and symptoms of abnormal neurological function, in the first few days of life in an infant born after 35 weeks of gestation. In this condition there is difficulty initiating and maintaining respirations, a subnormal level of consciousness, and associated depression of tone, reflexes, and possibly seizures. Hypoxia refers to deficiency of oxygen, Ischemia refers to restriction in blood flow to the brain. The result is "encephalopathy" which refers to damaged brain cells. Encephalopathy is a nonspecific response of the brain to injury which may occur via multiple methods, but is commonly caused by birth asphyxia, leading to cerebral hypoxia.

Signs and symptoms In neonates born at or beyond 35 weeks, neonatal encephalopathy may present itself as the following symptoms:

Reduced level of consciousness Seizures (which peak at 48 hours) Difficulty initiating and maintaining respiration Depression of tone and reflexes

Diagnosis Cord blood gas analysis can be used to determine if there is perinatal hypoxia/asphyxia, which are potential causes of hypoxic-ischemic encephalopathy or cerebral palsy, and give insight into causes of intrapartum fetal distress. Cord blood gas analysis is indicated for high-risk pregnancies, in cases where C-sections occurred due to fetal compromise, if there were abnormal fetal heart rate patterns, Apgar scores of 3 or lower, intrapartum fever, or multifetal gestation. Evidence of brain injury related to the hypoxic-ischemic events that cause neonatal encephalopathy can be seen with brain MRIs, CTs, magnetic resonance spectroscopy imaging or ultrasounds. Neonatal encephalopathy may be assessed using Sarnat staging. Brain MRI is usually performed within eight days of life. Features that can be seen on MRI brain are: periventricular leukomalacia, basal ganglia and thalamus lesions, and multicystic encephalopathy. Besides that, diffusion MRI would show low apparent diffusion coefficient (ADC) values in the first seven days of life. This is followed by pseudonormalisation of ADC values (normalisation of ADC values despite having persistent underlying brain injuries) which can persists up to two weeks.

Treatment

In the past, treatment options were limited to supportive medical therapy. Currently, neonatal encephalopathy is treated using hypothermia therapy. This has been shown to reduce brain damage, reduce future disability, and improve survival. Hypothermia therapy is also sometimes termed hypothermic neural rescue therapy. Clinical trials are taking place to investigate the effectiveness of stem cell-based interventions, which are thought to have the potential to reduce mortality and improve the long-term development of newborn infants with neonatal encephalopathy.

Prognosis HIE is a major predictor of neurodevelopmental disability in term infants. 25 percent have permanent neurological deficits.

Epidemiology Overall, the relative incidence of neonatal encephalopathy is estimated to be between 2 and 9 per 1000 term births. 40% to 60% of affected infants die by 2 years old or have severe disabilities. In 2013 it was estimated to have resulted in 644,000 deaths down from 874,000 deaths in 1990.

References

External links

Worked examples

Example 1 — a first encounter with Neonatal encephalopathy

Start with the simplest possible case. Write down what Neonatal encephalopathy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Neonatal encephalopathy 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 Neonatal encephalopathy 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 Neonatal encephalopathy

In research: Neonatal encephalopathy appears in biology 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 Neonatal encephalopathy 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: Neonatal encephalopathy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Neonatology, Neurological disorders in children, so understanding it makes those chapters shorter.
In everyday life: Look for Neonatal encephalopathy 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 Neonatal encephalopathy in 20 minutes

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

Frequently asked questions

What is Neonatal encephalopathy in simple terms?

Why does Neonatal encephalopathy matter?

Because it connects several biology 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 Neonatal encephalopathy?

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 Neonatal encephalopathy.