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ECG

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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

ECG

ECG is used to recording the electrical activity of the heart