Chapter03-63ec6.pdf - Chapter 3 Individual Vectors Chapter...

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6/25/12 1 Chapter 3 Individual Vectors Chapter 3 Vectors A vector is a diagrammatic way to show: ! Strength of electrical impulse ! Direction of electrical impulse Each cell gives rise to its own electrical impulse. Each varies in intensity and direction . The heart has a few million individual vectors.
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6/25/12 2 Chapter 3 Adding and Subtracting Vectors Vectors: ! Represent amounts of energy and direction + Add up when going in same direction " " # Cancel each other out if they point in opposite directions > At an angle, they add or subtract energy and change directions when they meet Chapter 3 Electrical Axis of the Heart The final vector: Sum of all ventricular vectors = electrical axis of the heart Each wave and segment has its own respective vector: ! P wave vector ! T wave vector ! ST segment vector ! QRS vector ECG: Measurement of vectors as they pass under an electrode
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6/25/12 3 Chapter 3 Electrodes and Waves Positive impulse moving away from electrode is converted
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