Magnetocardiogram (MCG)

Definition

A magnetocardiogram (MCG) is a non-invasive diagnostic tool that measures the magnetic fields produced by the electrical activity of the heart. It provides information similar to an electrocardiogram (ECG) but with higher sensitivity to certain cardiac conditions.

5 Must Know Facts For Your Next Test

1. MCGs detect magnetic fields generated by ionic currents in myocardial cells during cardiac cycles.
2. The sensitivity of MCGs to weak magnetic fields allows for early detection of ischemic heart disease.
3. Unlike ECGs, MCGs are not affected by the body's electrical conductivity properties, providing clearer signals.
4. MCGs are typically measured using Superconducting Quantum Interference Devices (SQUIDs).
5. The spatial resolution of an MCG can help localize areas of abnormal electrical activity within the heart.

Review Questions

• What type of device is commonly used to measure magnetocardiograms and why?
• How does an MCG differ from an ECG in terms of signal detection and clarity?
• Why might an MCG be preferred over traditional methods for detecting ischemic heart disease?

Related terms

Superconducting Quantum Interference Device (SQUID): An extremely sensitive magnetometer used to measure very weak magnetic fields, often employed in MCG measurements.

Electrocardiogram (ECG): A test that records the electrical activity of the heart through electrodes placed on the skin.

Ischemic Heart Disease: A condition characterized by reduced blood flow to the heart muscle, often detectable by both ECG and MCG.