Sclerotherapy

Key takeaways

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

Reference excerpt

Sclerotherapy (the word reflects the Greek skleros, meaning hard) is a procedure used to treat blood vessel malformations (vascular malformations) and also malformations of the lymphatic system. A medication is injected into the vessels, which makes them shrink. It is used for children and young adults with vascular or lymphatic malformations. In adults, sclerotherapy is often used to treat spider veins, smaller varicose veins, hemorrhoids, and hydroceles. Sclerotherapy is one method for the treatment of spider veins, varicose veins (which are also often treated with surgery, radiofrequency, and laser ablation), and venous malformations. In ultrasound-guided sclerotherapy, ultrasound is used to visualize the underlying vein so the physician can deliver and monitor the injection. Sclerotherapy often takes place under ultrasound guidance after venous abnormalities have been diagnosed with duplex ultrasound. Sclerotherapy under ultrasound guidance and using microfoam sclerosants has been shown in a literature reviewed paper published by the American Vein and Lymphatic Society to be effective in controlling reflux from the sapheno-femoral and sapheno-popliteal junctions. However, some authors believe that sclerotherapy is not suitable for veins with reflux from the greater or lesser saphenous junction, or for veins with axial reflux. This is due to the emergence of more effective technologies, including laser ablation and radiofrequency, which have demonstrated superior efficacy to sclerotherapy for treatment of these veins.

Historical aspects Sclerotherapy has been used in the treatment of spider veins and occasionally varicose veins for over 150 years. Like varicose vein surgery, sclerotherapy techniques have evolved during that time. Modern techniques including ultrasonographic guidance and foam sclerotherapy are the latest developments in this evolution. The first reported attempt at sclerotherapy was by D Zollikofer in Switzerland in 1682, who injected an acid into a vein to induce thrombus formation. Both Debout and Cassaignaic reported success in treating varicose veins by injecting perchlorate of iron in 1853. Desgranges in 1854 cured 16 cases of varicose veins by injecting iodine and tannin into the veins. This was approximately 12 years after the probable advent of great saphenous vein stripping in 1844 by Madelung. However, due to high rates of side-effects with the drugs used at the time, sclerotherapy had been practically abandoned by 1894. With the improvements in surgical techniques and anaesthetics over that time, stripping became the treatment of choice. Work continued on alternative sclerosants in the early 20th century. During that time carbolic acid and perchlorate of mercury were tried and whilst these showed some effect in obliterating varicose veins, side-effects also caused them to be abandoned. Prof. Sicard and other French doctors developed the use of sodium carbonate and then sodium salicylate during and after the First World War. Quinine was also used with some effect during the early 20th century. At the time of Coppleson's book in 1929, he was advocating the use of sodium salicylate or quinine as the best choices of sclerosant. Further work on improving the technique and development of safer more effective sclerosants continued through the 1940s and 1950s. Of particular importance was the development of sodium tetradecyl sulfate (STS) in 1946, a product still widely used to this day. George Fegan in the 1960s reported treating over 13,000 patients with sclerotherapy, significantly advancing the technique by focussing on fibrosis of the vein rather than thrombosis, concentrating on controlling significant points of reflux and emphasizing the importance of compression of the treated leg. The procedure became medically accepted in mainland Europe during that time. However, it was poorly understood or accepted in England or the United States, a situation that continues to this day amongst some sections of the medical community. The next major development in the evolution of sclerotherapy was the advent of duplex ultrasonography in the 1980s and its incorporation into the practise of sclerotherapy later that decade. Knight was an early advocate of this new procedure and presented it at several conferences in Europe and the United States. Thibault's article was the first on this topic to be published in a peer-reviewed journal. The work of Cabrera and Monfreaux in utilising foam sclerotherapy along with Tessari's "3-way tap method" of foam production further revolutionised the treatment of larger varicose veins with sclerotherapy. This has now been further modified by Whiteley and Patel to use 3 non-silicone syringes for more long lasting foam.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Sclerotherapy

Start with the simplest possible case. Write down what Sclerotherapy 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 Sclerotherapy 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 Sclerotherapy 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 Sclerotherapy

In research: Sclerotherapy 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 Sclerotherapy 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: Sclerotherapy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Vascular surgery, so understanding it makes those chapters shorter.
In everyday life: Look for Sclerotherapy 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.

How to study Sclerotherapy in 20 minutes

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

Frequently asked questions

What is Sclerotherapy in simple terms?

Sclerotherapy (the word reflects the Greek skleros, meaning hard) is a procedure used to treat blood vessel malformations (vascular malformations) and also malformations of the lymphatic system. A medication is injected into the vessels, which makes them shrink.

Why does Sclerotherapy 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 Sclerotherapy?

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 Sclerotherapy.