science

Transcatheter pulmonary valve replacement

Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement rather than just read about it. In short: Transcatheter pulmonary valve replacement (TPVR), also known as percutaneous pulmonary valve implantation (PPVI), is the replacement of the pulmonary valve via catheterization through a vein. It is a significantly less invasive procedure in comparison to open heart surgery and is commonly used to treat conditions such as pulmonary atresia.

Key takeaways

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Reference excerpt

Transcatheter pulmonary valve replacement (TPVR), also known as percutaneous pulmonary valve implantation (PPVI), is the replacement of the pulmonary valve via catheterization through a vein. It is a significantly less invasive procedure in comparison to open heart surgery and is commonly used to treat conditions such as pulmonary atresia.

Uses TPVR can be used to repair congenital defects in the pulmonary valve or right ventricular outflow tract dysfunction, such as pulmonary atresia, Tetralogy of Fallot, or persistent truncus arteriosus. TPVR can also be used to replace dysfunctional artificial heart valves. For those experiencing symptoms, TPVR is indicated when the right ventricular systolic pressure is above 60 mmHg and/or when there is moderate to severe pulmonary regurgitation. For those not experiencing any symptoms, TPVR is indicated if there is severe right ventricular outflow tract narrowing and/or severe pulmonary insufficiency, with decreased exercise capacity, progressive right ventricular dilation, progressive right ventricular dysfunction, progressive tricuspid valve regurgitation, right ventricular systolic pressure above 80 mmHg, or cardiac fibrillation. For dysfunctional artificial conduits, TPVR immediately resolves pulmonary regurgitation and normalizes the right ventricular outflow tract gradient, and is associated with significant improvements in symptoms and improvements in long-term ventricular function.

Contraindications Active infection, central vein occlusion, coronary occlusion, and need for other surgeries such as for arrhythmia are contraindications for TPVR. If coronary compression (which impairs coronary blood flow) is observed with balloon dilation in the right ventricular outflow tract, TPVR is also contraindicated. This test is performed to prevent potentially fatal complications, for which approximately 5% of candidates are at risk. TPVR is not recommended for tracts that are less than 16 mm or more than 29 mm in diameter.

Complications There is a low incidence of major complications, which is likely due to pre-procedural assessments preventing individuals with unfavourable anatomy from undergoing the procedure. The most common complication is fracture of the stent frame. This is seen in up to 30% of cases. The majority of stent fractures are diagnosed by routine imaging and are not clinically relevant. Stent fractures leading to obstruction of the right ventricular outflow tract is the most common reason for repeat intervention and can be treated with valve-in-valve procedures (placing a new valve inside the failed valve). More severe fractures may require surgery. Risk factors for stent fractures include younger age, smaller tract diameter, and position of the valve directly below the sternum. Tears or ruptures of the right ventricular outflow tract may occur during the procedure, especially if the tract is already heavily calcified. This is reported to occur in up to 9% of procedures. Most cases are manageable by using a covered stent and do not lead to severe bleeding. Infective endocarditis occurs at a rate of about 1%-3%. Most cases do not directly impact the implanted valve, and most cases can be treated with antibiotics. However, infective endocarditis can also cause valve explantation or sepsis, which can lead to death. Rare complications that may require urgent surgery include valve migration, valve embolization, pulmonary artery occlusion, pulmonary artery rupture, or coronary artery compression impeding blood flow. Death is rare, and is usually attributable to other comorbidities rather than from the implantation procedure itself.

Procedure

Pre-procedural assessment Several tests are performed before the procedure to assess whether the procedure is suitable for the individual and to record their anatomy in preparation for the procedure. Ventricular function and size are assessed with an echocardiogram. The right ventricle and the anatomy of the outflow tract, including any anatomical variations, are also assessed with cardiac magnetic resonance imaging. The severity of the outflow tract defect or pulmonary regurgitation is assessed with Doppler ultrasonography.

Operation TPVR is a percutaneous procedure, meaning the device is brought into the body through the skin and into a vein. Patients are put under general anesthesia. The heart is typically reached by passing through the femoral vein, jugular vein, or subclavian vein. A balloon dilation test is performed first, to confirm that coronary compression will not occur and the procedure can continue. Stent fractures can be prevented by using pre-stenting, using a bare metal stent before TPVR. After the valve is implanted, balloon dilation is used to create the diameter of the valve. At the end of the procedure, pressure is applied to the area to encourage hemostasis (stop bleeding).

Recovery Patients undergoing TPVR are typically ambulatory within 6 hours of finishing the procedure and can be discharged home within 24 hours. As cardiopulmonary bypass is not required, a stay in the intensive care unit and an extended hospital stay are generally not needed.

History TPVR was developed as a less invasive alternative to other treatment options requiring open heart surgery, such as patch augmentation, replacing the native valve with an artificial heart valve, or using a valved conduit. These surgeries typically require repeat surgeries to repair issues including pulmonary regurgitation, valve narrowing, kinking of the conduit, or calcification, leading to significant morbidity. The first TPVR was performed in 2000. This device was further developed into the Melody transcatheter pulmonary valve by Medtronic. The Melody device received approval from Health Canada in 2006 and from the US Food and Drug Administration (FDA) in 2010. A similar device, the Edwards Sapien pulmonic transcatheter heart valve, produced by Edwards Lifesciences, first received FDA approval in 2015. The comparatively lower risks of TPVR and reduced need for reintervention compared to traditional surgical treatments has led to a paradigm shift favouring earlier treatment for right ventricular outflow tract defects, which were previously postponed due to the risks of traditional surgery.

See also Cardiac catheterization Percutaneous aortic valve replacement

References

Worked examples

Example 1 — a first encounter with Transcatheter pulmonary valve replacement

Start with the simplest possible case. Write down what Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement

In research: Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement 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: Transcatheter pulmonary valve replacement is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cardiac procedures, so understanding it makes those chapters shorter.
In everyday life: Look for Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Transcatheter pulmonary valve replacement 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.
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Frequently asked questions

What is Transcatheter pulmonary valve replacement in simple terms?

Why does Transcatheter pulmonary valve replacement 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 Transcatheter pulmonary valve replacement?

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 Transcatheter pulmonary valve replacement.