science

Pericardial effusion

Pericardial effusion 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 Pericardial effusion rather than just read about it. In short: A pericardial effusion is an abnormal accumulation of fluid in the pericardial cavity. The pericardium is a two-part membrane surrounding the heart: the outer fibrous connective membrane and an inner two-layered serous membrane.

Key takeaways

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

Reference excerpt

A pericardial effusion is an abnormal accumulation of fluid in the pericardial cavity. The pericardium is a two-part membrane surrounding the heart: the outer fibrous connective membrane and an inner two-layered serous membrane. The two layers of the serous membrane enclose the pericardial cavity (the potential space) between them. This pericardial space contains a small amount of pericardial fluid, normally 15-50 mL in volume. The pericardium, specifically the pericardial fluid provides lubrication, maintains the anatomic position of the heart in the chest (levocardia), and also serves as a barrier to protect the heart from infection and inflammation in adjacent tissues and organs. By definition, a pericardial effusion occurs when the volume of fluid in the cavity exceeds the normal limit. If large enough, it can compress the heart, causing cardiac tamponade and obstructive shock. Some of the presenting symptoms are shortness of breath, chest pressure/pain, and malaise. Important etiologies of pericardial effusions are inflammatory and infectious (pericarditis), neoplastic, traumatic, and metabolic causes. Echocardiogram, CT and MRI are the most common methods of diagnosis, although chest X-ray and EKG are also often performed. Pericardiocentesis may be diagnostic as well as therapeutic (form of treatment).

Signs and symptoms Pericardial effusion presentation varies from person to person depending on the size, acuity and underlying cause of the effusion. Some people may be asymptomatic and the effusion may be an incidental finding on an examination. Others with larger effusions may present with chest pressure or pain, dyspnea, shortness of breath, and malaise (a general feeling of discomfort or illness). Yet others with cardiac tamponade, a life-threatening complication, may present with dyspnea, low blood pressure, weakness, restlessness, hyperventilation (rapid breathing), discomfort with lying flat, dizziness, syncope or even loss of consciousness. This causes a type of shock, called obstructive shock, which can lead to organ damage. Non-cardiac symptoms may also present due to the enlarging pericardial effusion compressing nearby structures. Some examples are nausea and abdominal fullness, dysphagia and hiccups, due to compression of stomach, esophagus, and phrenic nerve respectively.

Causes Any process that leads to injury or inflammation of the pericardium or inhibits appropriate lymphatic drainage of the fluid from the pericardial cavity leads to fluid accumulation. Pericardial effusions can be found in all populations worldwide but the predominant etiology has changed over time, varying depending on the age, location, and comorbidities of the population in question. Out of all the numerous causes of pericardial effusion, some of the leading causes are inflammatory, infectious, neoplastic and traumatic. These causes can be categorized into various classes, but an easy way to understand them is dividing them into inflammatory versus non-inflammatory.

Inflammatory Infectious: Viral: coxsackie A and B viruses, HIV (seen in 5-43% of HIV patients), hepatitis viruses, parvovirus B19 Bacterial: Mycobacterium (tuberculosis), gram positive cocci (Streptococcus, Staphylococcus), Mycoplasma, Neisseria (meningitides, gonorrhea), Coxiella burnetii. Tuberculosis is the leading cause of pericardial effusion in the developing world, with the mortality rate ranging from 17 to 40%. Fungal: Histoplasma, Candida Protozoal: Echinococcus, Trichinosis, Toxoplasma Cardiac injury syndromes: Heart surgery (postpericardiotomy syndrome), post-myocardial infarction (Dressler's syndrome), coronary interventions such as drug eluting stents. Post-cardiac surgery pericardial effusions contribute to 54% of total effusions in the pediatric population. Cardiac inflammation: idiopathic pericarditis is the most common inflammatory cause of pericardial effusion in the United States. Autoimmune: lupus, rheumatoid arthritis, Sjögren syndrome, scleroderma, Dressler's syndrome, sarcoidosis Drug hypersensitivity/ side effects: Chemotherapy drugs (doxorubicin and cyclophosphamide), Minoxidil Others: kidney failure, uremia

Non-Inflammatory Neoplastic: pericardial effusions may present as primary manifestations of underlying malignancy. Primary tumor: the most common primary pericardial tumor is mesothelioma. Various imaging appearances such as solid and cystic components could be encountered on CT scan on those with mesothelioma. Other less common primary tumors are sarcoma, lymphoma, and primitive neuroectodermal tumour. Secondary cancers: that have spread to the pericardium such as breast and lung cancer. Pericardial irregular thickening and/or nodularity, focal, or diffuse FDG uptake on PET scan and lack of preserved fat plane with an adjacent tumor are strongly suggestive of cancer spread from other parts of the body. Metabolic: hypothyroidism (myxedema coma), severe protein deficiency Traumatic: penetrating or blunt chest trauma, aortic dissection Reduced lymphatic drainage: congestive heart failure, nephrotic syndrome

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Pericardial effusion

Start with the simplest possible case. Write down what Pericardial effusion 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 Pericardial effusion 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 Pericardial effusion 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 Pericardial effusion

In research: Pericardial effusion 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 Pericardial effusion 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: Pericardial effusion is common in secondary-school and first-year university syllabi. It links to neighbouring topics Disorders of fascia, Pericardial disorders, so understanding it makes those chapters shorter.
In everyday life: Look for Pericardial effusion 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 Pericardial effusion in 20 minutes

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

Frequently asked questions

What is Pericardial effusion in simple terms?

Why does Pericardial effusion 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 Pericardial effusion?

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 Pericardial effusion.