Medical devices have poor contact and do not respond to patient data in a timely manner. It doesn't matter much, the main thing is to see if the equipment is reading properly. If you are not sure, you can ask the nurse to reconnect the wiring on the patient.
Introduction: ECG is the abbreviation of electrocardiogram, meaning electrocardiogram, refers to the heart in each cardiac cycle, by the pacing point, atrium, ventricle successive excitation, accompanied by bioelectric changes, through the electrocardiographic tracer from the surface of the body to elicit a variety of forms of potential changes in the graph.
Principle: The tissues and fluids around the heart can conduct electricity, so the human body can be viewed as a volume conductor with three degrees of space: length, width, and thickness. The heart is like a power source, the sum of the action potential changes of countless cardiomyocytes can be conducted and reflected to the body surface. There are potential differences between many points on the body surface, and there are also many points that are isoelectric without potential differences between each other.