biology

Seldinger technique

Seldinger technique 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 Seldinger technique rather than just read about it. In short: The Seldinger technique, also known as Seldinger wire technique, is a medical procedure to obtain safe access to blood vessels and other hollow organs. It is named after Sven Ivar Seldinger (1921–1998), a Swedish radiologist who introduced the procedure in 1953.

Key takeaways

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

Reference excerpt

The Seldinger technique, also known as Seldinger wire technique, is a medical procedure to obtain safe access to blood vessels and other hollow organs. It is named after Sven Ivar Seldinger (1921–1998), a Swedish radiologist who introduced the procedure in 1953.

Uses The Seldinger technique is used for angiography, insertion of chest drains and central venous catheters, insertion of PEG tubes using the push technique, insertion of the leads for an artificial pacemaker or implantable cardioverter-defibrillator, and numerous other interventional medical procedures.

Complications The initial puncture is with a sharp instrument, and this may lead to hemorrhage or perforation of the organ in question. Infection is a possible complication, and hence asepsis is practiced during most Seldinger procedures. Loss of the guidewire into the cavity or blood vessel is a significant and generally preventable complication.

Description The desired vessel or cavity is punctured with a sharp hollow needle, with ultrasound guidance if necessary. A round-tipped guidewire is then advanced through the lumen of the needle, and the needle is withdrawn. A sheath or blunt cannula can now be passed over the guidewire into the cavity or vessel. Alternatively, drainage tubes are passed over the guidewire (as in chest drains or nephrostomies). After passing a sheath or tube, the guidewire is withdrawn. An introducer sheath can be used to introduce catheters or other devices to perform endoluminal (inside the hollow organ) procedures, such as angioplasty. Fluoroscopy may be used to confirm the position of the catheter and to manoeuvre it to the desired location. Injection of radiocontrast may be used to visualize organs. Interventional procedures, such as thermoablation, angioplasty, embolisation or biopsy, may be performed. Upon completion of the desired procedure, the sheath is withdrawn. In certain settings, a sealing device may be used to close the hole made by the procedure.

A modified technique, known as the accelerated Seldinger technique, has also been described where the needle, guidewire, dilator, and sheath are inserted as one unit.

History Prior to the description of the Seldinger technique, sharp trocars were used to create lumens through which devices could be passed. This had a high rate of complications. However, with the introduction of the Seldinger technique, angiography became a relatively risk-free procedure, and the field of interventional radiology blossomed. Building on the work of Seldinger, Charles Dotter and Andreas Gruentzig developed angioplasty.

References

External links

Flash animation of the Seldinger technique Archived 2006-10-17 at the Wayback Machine (FRCA.co.uk) Higgs, ZC; Macafee, DA; Braithwaite, BD; Maxwell-Armstrong, CA (2005). "The Seldinger technique: 50 years on". Lancet. 366 (9494): 1407–9. doi:10.1016/S0140-6736(05)66878-X. PMID 16226619. S2CID 42628400.

Illustrations

Worked examples

Example 1 — a first encounter with Seldinger technique

Start with the simplest possible case. Write down what Seldinger technique 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 Seldinger technique 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 Seldinger technique 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 Seldinger technique

In research: Seldinger technique 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 Seldinger technique 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: Seldinger technique is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diagnostic cardiology, Eponyms in medicine, Interventional radiology, so understanding it makes those chapters shorter.
In everyday life: Look for Seldinger technique 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 Seldinger technique in 20 minutes

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

Frequently asked questions

What is Seldinger technique in simple terms?

Why does Seldinger technique 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 Seldinger technique?

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 Seldinger technique.