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With a focus on methods of recording changes in the electric field of the heart, researchers have long been left aside the question of the existence of a magnetic field of the heart. But the electric field and magnetic field are just two sides of a single electromagnetic field. If any change of the electric field in time in the same space should occur associated magnetic field. So, probably, can be regarded as a kind heart and a magnet with varying parameters. And could the study of biological magnet to enrich our knowledge about the heart and assist in the diagnosis of various diseases? The first steps towards solving this problem have been made. New search - new worries. The intensity of the recorded magnetic fields is very small, so it is necessary to ensure a thorough screening of interference, including Earth's magnetic field. However, the first shot magneto cardiograms gave a very interesting material that gives hope to receive soon a new sensitive indicator for the diagnosis of heart disease.
Electrocardiographic methods of diagnosis, as is almost always necessary companions of the modern diagnostic apparatus, may still be insufficient to detect certain diseases.
Sometimes it is very important is information about the mechanical work of the heart. Comes to rescue ultrasound. Propagation velocity, absorption and reflection of ultrasonic waves are different for different tissues and organs, which allow using the source and destination of such oscillations, detect these differences. To see the reflection of ultrasound from various bodies on the screen of the tube, it is necessary to convert the ultrasound into electrical signals.
Ultrasonic location can be successfully applied to study the heart, allowing a precise characterization and peculiarities of the heart. The recorded curves reflect the motion of the walls of different parts of the heart and its valves.