science

Lincoln sign

Lincoln sign 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 Lincoln sign rather than just read about it. In short: Lincoln sign is the medical sign consisting of excessive popliteal artery pulsation due to hemodynamic effects of aortic regurgitation. This sign is associated with Marfan syndrome, in which aortic root dilation and aortic incompetence are common features.

Key takeaways

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

Reference excerpt

Lincoln sign is the medical sign consisting of excessive popliteal artery pulsation due to hemodynamic effects of aortic regurgitation. This sign is associated with Marfan syndrome, in which aortic root dilation and aortic incompetence are common features.

History The name Lincoln sign is based on a hypothetical diagnosis for a patient, namely the USA's 16th president Abraham Lincoln. In 1962, Dr Abraham M. Gordon suggested that Lincoln had Marfan's syndrome. In 1964, Dr Harold Schwartz adduced further evidence that Lincoln might have had Marfan syndrome. Later, Schwartz suggested that, based upon evidence shown in a famous photograph, Lincoln had the aortic insufficiency associated with what is now called Lincoln sign. However, Gordon's hypothesis is highly controversial.

See also Abraham Lincoln § Health Medical and mental health of Abraham Lincoln Aortic insufficiency § Physical examination

References

External links

Worked examples

Example 1 — a first encounter with Lincoln sign

Start with the simplest possible case. Write down what Lincoln sign 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 Lincoln sign 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 Lincoln sign 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 Lincoln sign

In research: Lincoln sign 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 Lincoln sign 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: Lincoln sign is common in secondary-school and first-year university syllabi. It links to neighbouring topics Medical sign stubs, Medical signs, so understanding it makes those chapters shorter.
In everyday life: Look for Lincoln sign 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 Lincoln sign in 20 minutes

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

Frequently asked questions

What is Lincoln sign in simple terms?

Why does Lincoln sign 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 Lincoln sign?

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 Lincoln sign.