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Unformatted text preview: s in impulse generation – Abnormal automaticity
– Triggered activity Errors in impulse conduction – Reentry Reentry
Reentry Permits indefinite propagation of cardiac impulse Continued activation of previously refractory cardiac tissue Can occur at any level of conduction system Common in heart disease or conduction abnormalities
– Usually does not occur in healthy hearts Requirements of Reentry Requirements of Reentry 2.) Area of unidirectional block (prolonged refractoriness) 3.) Slow conduction in other pathway (shorter refractory period) 1.) 2 pathways for impulse conduction Process of Reentry Process of Reentry 1.) Premature Beat 2.) Area of unidirectional block (prolonged refractoriness)
5.) Previously refractory tissue now excitable (due to slow conduction in antegrade pathway) 3.) Slow conduction in other pathway (shorter refractory period) (Antegrade Pathway) 4.) Reenters area of unidirectional block (Retrograde Pathway) Atrial Fibrillation/Flutter Atrial Fibrillation/Flutter Pathophysiology
– Atrial fibrill...
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- Fall '12