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Atrial Fibrillation_fall 2012


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Unformatted text preview: nder any circumstances Includes Phases 0, 1, 2, and part of 3 Relative Refractory Period Relative Refractory Period Period of time during which cardiac tissue is more difficult than normal to excite, but can still be stimulated Occurs at some point during Phase 3 Electrocardiogram Electrocardiogram http://faculty­web.at.northwestern.edu/at/beaman/ecg/primer.html Accessed November 8, 2008 Electrocardigraphic Electrocardigraphic Waves and Intervals P wave – Atrial depolarization (contraction) PR interval – Time between atrial contraction and ventricular contraction – 120­200 msec Electrocardigraphic Electrocardigraphic Waves and Intervals QRS complex – Ventricular depolarization (contraction) (Phase 0) – < 100 msec ST segment – Represents plateau phase (Phase 2) T wave – Ventricular repolarization (Phase 3) Electrocardigraphic Electrocardigraphic Waves and Intervals QT interval – Measurement of ventricular refractoriness – Measured from beginning of QRS complex to end of T wave – Used as monitoring parameter for certain drugs ≤ 440 msec Relationship Between ECG and Relationship Between ECG and Ventricular Action Potential Mechanism of Arrhythmia Formation Mechanism of Arrhythmia Formation Error...
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