science

Phonocardiogram

Phonocardiogram 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 Phonocardiogram rather than just read about it. In short: A phonocardiogram (or PCG) is a plot of high-fidelity recording of the sounds and murmurs made by the heart with the help of the machine called the phonocardiograph; thus, phonocardiography is the recording of all the sounds made by the heart during a cardiac cycle. Medical use Heart sounds result from vibrations created by the closure of the heart valves.

Key takeaways

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

Reference excerpt

A phonocardiogram (or PCG) is a plot of high-fidelity recording of the sounds and murmurs made by the heart with the help of the machine called the phonocardiograph; thus, phonocardiography is the recording of all the sounds made by the heart during a cardiac cycle.

Medical use

Heart sounds result from vibrations created by the closure of the heart valves. There are at least two; the first (S1) is produced when the atrioventricular valves (tricuspid and mitral) close at the beginning of systole and the second (S2) when the aortic valve and pulmonary valve (semilunar valves) close at the end of systole. Phonocardiography allows the detection of subaudible sounds and murmurs and makes a permanent record of these events. In contrast, the stethoscope cannot always detect all such sounds or murmurs and provides no record of their occurrence. The ability to quantitate the sounds made by the heart provides information not readily available from more sophisticated tests and provides vital information about the effects of certain drugs on the heart. It is also an effective method for tracking the progress of a patient's disease.

Discrete and the packet wavelet transform According to a review by Cherif et al., discrete wavelet transform (DWT) is better at not affecting S1 or S2 while filtering heart murmurs. Packet wavelet transform affects internal components structure much more than DWT does.

History

Awareness of the sounds made by the heart dates to ancient times. The idea of developing an instrument to record it may date back to Robert Hooke (1635–1703), who wrote: "There may also be a possibility of discovering the internal motions and actions of bodies - whether animal, vegetable, or mineral, by the sound they make". The earliest known examples of phonocardiography date to the 1800s. Monitoring and recording equipment for phonocardiography was developed through the 1930s and 1940s. Standardization began by 1950, when the first international conference was held in Paris. A phonocardiogram system manufactured by Beckman Instruments was used on at least one of the Project Gemini crewed spaceflights (1965–1966) to monitor the heartbeat of astronauts on the flight. It was one of many Beckman Instruments specialized for and used by NASA. John Keefer filed a patent for a phonocardiogram simulator in 1970 while he was an employee of the U.S. government. The original patent description indicates that it is a device which via electrical voltage mimics the human heart's sounds.

Fetal Phonocardiogram A fetal phonocardiogram (or fPCG) is a specialized application of phonocardiography designed to be a non-invasive diagnostic technique to capture the sounds of the fetal heart in utero. These fetal phonocardiograms can be analyzed to detect any abnormalities in the fetal heart. Fetal phonocardiography has become an important tool in prenatal care, as it allows clinicians to detect and monitor potential heart problems in the fetus before birth. The use of phonocardiography to study the fetal heart dates back to the 1960s, when researchers first began to explore the feasibility of detecting fetal heart sounds using external microphones. Early studies focused on using phonocardiography to measure fetal heart rate and rhythm. Over time, advances in technology and techniques have enabled researchers to use fetal phonocardiography to detect a wider range of fetal heart abnormalities. Fetal phonocardiography is typically performed during routine prenatal visits, starting around 18–20 weeks of gestation. The procedure involves placing a small microphone on the mother's abdomen over the fetal heart. The microphone captures the sounds of the fetal heart, which are then amplified and recorded for analysis. Khandoker et al. developed a multi-channel fetal phonocardiogram (fPCG) with four sound transducers applied in a simple and consistent pattern across the maternal abdomen. The intellectual property (IP) technology license was given to the home-based monitoring device, the Emirati startup, that helps pregnant mothers monitor fetal heartbeat and the baby's cardiac activity.

Illustrations

Worked examples

Example 1 — a first encounter with Phonocardiogram

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

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

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

Frequently asked questions

What is Phonocardiogram in simple terms?

Why does Phonocardiogram 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 Phonocardiogram?

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 Phonocardiogram.