Lecture 4 - Lecture 4: Propagated Electrical Activity in...

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Lecture 4: Propagated Electrical Activity in the Heart PGY452/552 R. Rasmusson
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Electrical Activity Moves Through the Heart in an Orderly Fashion The electrical properties of the cells and the electrical connections between cells determines the properties of propagation. Abnormalities of propagated electrical activity are known as arrhythmias
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Normal Propagated electrical activity progresses as a wave front of the sodium mediated upstroke. A well defined upstroke is critical to rapid spread of electrical activity.
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Rhythmic activity starts at the SA node
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Regions of slow electrical activity include the sino-atrial node (SA node) and the Atrio-Ventricular node (AV node) Slow propagation usually is accompanied by slow (calcium mediated action potential upstrokes) Fast propagation requires a large current source.
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P-Wave corresponds to excitation of the Atrium. QRS complex corresponds the the depolarization of the ventricle. T wave corresponds to the repolarization
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This note was uploaded on 02/22/2011 for the course PGY 452 taught by Professor Dr.baizer during the Spring '11 term at SUNY Buffalo.

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Lecture 4 - Lecture 4: Propagated Electrical Activity in...

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