EEG

             EEG or electrocardiograph

is an instrument used for recording the electrical activity of the heart.The electrical forces prodused by the heart during cardiac cycle(systole and diastole)are recorded on a graph called electrocardiogram.It is the technique in which several electrodes are attached to the living skin,which transmit the electrical activity
of the human heart to the ECG machine. The test will be painless. It gives us the information regarding the heart muscles and the rhythm of the heart.This technique was first found out by Wilhem Einthoven in1903. The ECG of a human heart consist of three waves, namely P wave,QRS coplex and T wave
.The P wave is the upward deflection which represents the depolarisation of the auricles.The QRS complex is the large triangular wave which represents the ventricular depolarization.The T wave is the small wave which indicates the ventricular repolarisation.