ECG is a recording of the electrical activity resulting from a neural contract within the heart muscle responsible for constriction and expansion of the atria and ventricles.
The ECG appears in the form of a graph consisting of several small and large waves with specific measurements and any abnormalities in the normal function of the heart muscle that the doctor can diagnose through a difference in planning measurements.
The drawing begins with a small wave (P) resulting from the removal of the atrial fibrillation (constriction). This continues in 80 parts of a second that is shaped as a small plateau that does not naturally rise more than one square.
Followed by a large wave (QRS) resulting from the removal of the polarization of the ventricles (constriction), which lasts for 100 parts of the second is a sharp peak up to four squares.
Another wave shown in the intact heart muscle layout is a small (T) wave similar in shape and wave size (P) showing the result of re-polarization of the ventricles (extrusion).
The process of ECG by connecting the electrodes of the device to the four sides of the patient during the reclining on the back in a state of calm and relaxation and connect 6 other poles at certain points on the patient’s chest is as follows:
The first point: On the Farag between the fourth ribs on the right side of the shear bone.
Second point: On the fourth-left gap on the left side of the shear bone.
Third point: Be halfway between the second and fourth points diagonally.
The fourth point: Determines downwards from the middle of the left collarbone until the fifth rib.
The fifth point: Determines downwards from the front line of the left armpit until the fifth rib.
Sixth point: Specifies down from the middle line of the left armpit until the space between the ribs fifth.
The patient is connected to the device accurately and to improve the delivery of electricity from the body of the patient to the device can wipe the patient’s skin wet cotton or put a small amount of gel designed for planning devices and any radio or mobile phone should be removed and the removal of anything metallic on the patient’s body such as clock and jewelry.
It is worth mentioning that the inventor of the ECG device is Professor Dr. Waller in 1887. The charting device can not diagnose all cardiac arrhythmia, but it diagnoses most of the most serious, such as angina and heart stroke, one of the most important methods of diagnosis in the medical field in modern times.