Cardiology: Chapter 45

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5 Terms

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What is Echocardiography?

A test that uses sounds waves (ultrasound) to create moving pictures of the heart

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What is a defibrillator used for?

A device used to shock the heart when it stops beating normally, helping it start beating the right way again

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Why are ECG stress tests performed?

Checks if your heart gets enough blood and oxygen when it’s working harder, either through exercise or medicine's

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Arrhythmia

the heart is not beating in a normal rhythm — it can be too fast, too slow, or uneven.

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Explain the function of the amplifier, galvanometer, and stylus

  • Amplifier: makes the heart’s electrical signals stronger so they can be seen clearly.

  • Galvanometer: detects and measures the heart’s electrical signals.

  • Stylus: draws the lines (the heart’s electrical activity) on the ECG paper.