NSG 4330 Lecture 2: Complex Care Class 2 Notes ECG
11 Nov 2020
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Av node: backup pacemaker of the heart to lead to contraction of the ventricles. Waveform: waveform or deflection is movement away from baseline is either positive (upward) or negative direction (downward). A waveform that is partly positive and partly negative is biphasic, waveform that rests on the baseline is isoelectric. Positive electrode consider like an eye, looks at the flow of electrical current, leading to the waveform to point in the direction that the impulse is going. Leads: lead 1: records the difference in electrical potential between the left arm and right arm electrodes. Views the lateral wall of the left ventricle: lead 2: most commonly used. Records difference in electrical potential between the left arm (+) and right arm (-) electrodes. Views the inferior surface of the left ventricle: lead 3: records the difference in electrical potential between the left leg (+) and left arm (-) electrodes.
