ECG
ECG is used to recording the electrical activity of the heart
ECG
The study of electrical activity of the heart is termed as Electrocardiogram and the instrument use to measure the electrical activity is termed as Electrocardiograph Waveform of human heart P wave Due to atrial contraction Amplitude : 0.25mv Duration :0.12-0.22 s QRS wave Due to relaxation of atria and contraction of ventricles Amplitude : 1.60 mv Duration :0.07-0.1 s T wave Due to ventricular relaxation Amplitude:0.1-0.5mv Duration : 0.05-0.15s U wave Slow relaxation of intraventricular system Amplitude : less than 0.1mv Duration. : 0.2 s ECG LEAD SYSTEM Electrodes are
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