(Augmented voltage left arm) recording of the hearts voltage difference left arm electrode and the central point between right arm and the left leg aVF (Augmented voltage right arm) The recording of the hearts voltage between the right arm electrode and left arm and leg central point aVL (Rhythm strip) Lead III Difference of voltage between left arm and left leg Augmented leads aVR,aVL,aVF aVR Upper outer arms and the inner lower calves Lead I Records electrical voltage difference between right and left arm Lead II Records voltage difference between right arm and left leg. ST segment The beginning of ventricular depolarization should be flat at baseline T Wave Ventricular depolarization What age do you have to have a baseline ECG? 40-45 How often is ECG performed? Every 5-10 yrs Sedentary lifestyle Non active living that leads to obesity and other heart issues Electro-cardiograph How a ECG recording is obtained MultichannelĮlectro-cardiograph 12 lead instrument which record activity of the heart simulataneously from 12 views Computerized electro-cardiograph Have simultaneous 12 lead interpretive analysis How long does it take for an ECG tracing ? About 1 minute on a single 8x10" sheet of paper ECG machines traces impulses onto what? Heated sensitive paper to create a permanent record of its activity Where are electrodes placed on a patient? Limbs and chest to pick up electrical current produced by the contractions of the heart Amplifier Enlarges the impulses of the heart Galvanometer Transforms amplified impulses into mechanical motion Stylus Heated pen produces a printed representation on ECG paper First 3 leads are the standard or bipolar leads Monitor two electrodes.
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