biology

Lance–Adams syndrome

Lance–Adams syndrome 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 Lance–Adams syndrome rather than just read about it. In short: Lance–Adams syndrome (LAS) is a sequela of hypoxic encephalopathy due to respiratory arrest, airway obstruction, cardiac arrest, etc., several days after the onset of hypoxic encephalopathy. A condition that presents with functional myoclonus associated with increased cortical excitability in a few weeks.

Key takeaways

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

Reference excerpt

Lance–Adams syndrome (LAS) is a sequela of hypoxic encephalopathy due to respiratory arrest, airway obstruction, cardiac arrest, etc., several days after the onset of hypoxic encephalopathy. A condition that presents with functional myoclonus associated with increased cortical excitability in a few weeks. It was first reported by James Lance and Raymond Adams in 1963. It is a disease that presents Myoclonus as a sequela of hypoxic disorders in the brain due to asphyxiation and cardiopulmonary arrest. It is exacerbated by mental and physical anxiety such as intention, intentional movement, and tension.

Pathology It appears due to Basal ganglia lesions due to hypoxic encephalopathy.

Treatment Clonazepam and Valproate, which enhance serotonin and GABAA receptor, are widely used as therapeutic agents . It has been reported that Levetiracetam was effective in cases in which clonazepam and valproic acid were ineffective. Other reports have shown that piracetam has been shown to be effective.

Perampanel From around 2017, reports that Perampanel are effective have been gathered, and cases of complete cure have been reported. In April 2021, a group at Kyoto University reported a case of Lance Adams syndrome 11 years after onset due to hypoxic encephalopathy caused by a bronchial asthma attack, and in March 2022, a group at Kitasato University reported a case of Lance Adams syndrome after a hanging neck injury 1 year and 6 months after onset. There are an increasing number of reports showing improvement even in chronic cases, such as a case report of a patient who was able to hold a standing position after treatment with perampanel and significant improvement in motor myoclonus.

References

Worked examples

Example 1 — a first encounter with Lance–Adams syndrome

Start with the simplest possible case. Write down what Lance–Adams syndrome 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 Lance–Adams syndrome 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 Lance–Adams syndrome 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 Lance–Adams syndrome

In research: Lance–Adams syndrome 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 Lance–Adams syndrome 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: Lance–Adams syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brain disorders, Extrapyramidal and movement disorders, Medical signs, so understanding it makes those chapters shorter.
In everyday life: Look for Lance–Adams syndrome 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 Lance–Adams syndrome in 20 minutes

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

Frequently asked questions

What is Lance–Adams syndrome in simple terms?

Why does Lance–Adams syndrome 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 Lance–Adams syndrome?

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 Lance–Adams syndrome.