science

Heart-hand syndromes

Heart-hand syndromes 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 Heart-hand syndromes rather than just read about it. In short: Heart-hand syndromes are a group of rare diseases that manifest with both heart and limb deformities. As of July 2013, known heart-hand syndromes include Holt–Oram syndrome, Berk–Tabatznik syndrome, brachydactyly-long thumb syndrome, patent ductus arteriosus-bicuspid aortic valve syndrome, heart hand syndrome, Slovenian type and Heart-hand syndrome, Spanish type.

Key takeaways

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

Reference excerpt

Heart-hand syndromes are a group of rare diseases that manifest with both heart and limb deformities. As of July 2013, known heart-hand syndromes include Holt–Oram syndrome, Berk–Tabatznik syndrome, brachydactyly-long thumb syndrome, patent ductus arteriosus-bicuspid aortic valve syndrome, heart hand syndrome, Slovenian type and Heart-hand syndrome, Spanish type.

Types

Heart-hand syndrome type 1

Heart-hand syndrome type 1 is more commonly known as Holt–Oram syndrome. Is the most prevalent form of heart-hand syndrome. It is an autosomal dominant disorder that affects bones in the arms and hands (the upper limbs) and may also cause heart problems. The syndrome includes an absent radial bone in the arms, an atrial septal defect, and a first degree heart block.

Heart-hand syndrome type 2

Heart-hand syndrome type 2 is also known as Berk–Tabatznik syndrome. Berk–Tabatznik syndrome is a condition with an unknown cause that shows symptoms of short stature, congenital optic atrophy and brachytelephalangy. This condition is extremely rare with only two cases being found.

Heart-hand syndrome type 3

Heart-hand syndrome type 3 is very rare and has been described only in three members of a Spanish family. It is also known as Heart-hand syndrome, Spanish type.

Heart-hand syndrome, Slovenian type

Several people in multiple generations have had this type. It causes sudden cardiac death due to ventricular tachycardia, and it prominently causes a unique type of brachydactyly with mild hand involvement and more severe foot involvement.

Brachydactyly-long thumb syndrome

Described in one family. A unique feature in the syndrome is symmetric brachydactyly with long thumbs.

Patent ductus arteriosus-bicuspid aortic valve syndrome It has been confirmed that Patent ductus arteriosus-bicuspid aortic valve syndrome is a distinct syndrome from an allelic variant of Char syndrome. Hand anomalies include metacarpal hypoplasia.

Genetics It is unknown if heart-hand syndromes are caused by shared or distinct genetic defects. It has been claimed that congenital heart diseases are caused by a limited number of shared genetic defects. Holt–Oram syndrome, Brachydactyly-long thumb syndrome, Patent ductus arteriosus-bicuspid aortic valve syndrome and Heart-hand syndrome, Slovenian type are known to be autosomally dominant disorders. Brachydactyly-long thumb syndrome is known to have been transmitted from male-to-male in a single instance.

See also Cardiovascular disease Congenital heart defect Congenital limb deformities Hand deformity

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with Heart-hand syndromes

Start with the simplest possible case. Write down what Heart-hand syndromes 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 Heart-hand syndromes 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 Heart-hand syndromes 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 Heart-hand syndromes

In research: Heart-hand syndromes 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 Heart-hand syndromes 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: Heart-hand syndromes is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare syndromes, so understanding it makes those chapters shorter.
In everyday life: Look for Heart-hand syndromes 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 Heart-hand syndromes in 20 minutes

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

Frequently asked questions

What is Heart-hand syndromes in simple terms?

Why does Heart-hand syndromes 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 Heart-hand syndromes?

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 Heart-hand syndromes.