*NURSING > EXAM REVIEW > Dysrhythmias.docx (All)
1. Terminology a. Polarized resting state (no electrical activity) b. Depolarization Discharge of energy c. Repolarization return of electrical charge to original state (required to rec... eive next impulse) d. Impulse travels through the heart in a specific pathway/time frame 2. Sequence a. Polarized movement of charged ions across myocardial cell membrane (Na + K) Depolarization (wave motion) repolarization b. Electrical Activity i. Stimulus tells the heart ot beat ii. Precedes/causes mechanical activity (AEB ECG Wave tracing) c. Mechanical Activity i. Response to electrical stimuli ii. Contraction (AEB Pulse) d. During the R sequence; Atrial Diastole 3. Conduction Sequence a. SA Node AV Node Bundle of His L/R Bundle Branches Punkinjie Fibers 4. Rate at each site (the fastest node sets the tempo) (kids depend on chronotropy) The site with the fastest rate will take over TEST QUESTION a. SA Node 60-100 (15-30% of CO) b. AV Node 40-60 c. Punkinjie Fibers 20-40 [Show More]
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