Cardiac Dysrhythmias and Conduction Disorders
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| show | 1. Abnormal Automaticity. 2. Triggered activity due to problems with refractory phase. 3. Re-entry (circus) pathways of electrical conduction.
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| show | Tachycardia and Bradycardia
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| Tachycardias are usually due to what? | show 🗑
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| show | Excessive vagal stimulation (George Washington's vasovagal syncope)
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| When does an SA node block occur? What happens? | show 🗑
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| What are worse- problems with the atria or problems with the ventricles? | show 🗑
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| show | Transmission through the AV node is delayed or occasionally blocked. 1st degree: transmission is delayed. 2nd degree: transmission is delayed and sometimes blocked.
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| What is complete (3rd degree) AV node blockade? | show 🗑
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| show | No direct communication between the top of the heart and bottom of the heart.
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| What can be involved with premature contractions? | show 🗑
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| What is an ectopic pacemaker? | show 🗑
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| The myocardium is more or less active when it is damaged? | show 🗑
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| What is the most common cause of premature contractions? | show 🗑
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| What can cause premature contractions? | show 🗑
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| show | In the atria of normal people.
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| show | Ventricles; Ventricular fibrillation.
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| Ectopic pacemakers in the ________________ are more serious and symptomatic. | show 🗑
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| show | 1) Usually due to an ectopic pacemaker, which sets rhythm for rest of heart. 2) heart undergoes bursts of paroxysmal activity. 3) Can be halted by vagal stimulation producing AV node block. (pretend to poop)
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| show | Temporary bouts of tachycardia.
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| show | Ventricular Fibrillation
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| What is Vtach due to? | show 🗑
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| What is the problem of re-entry of impulses in the heart? | show 🗑
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| show | Not nearly as dangerous as VF. Ventricles can often maintain their own rhythm. Blood passively leaks into ventricles, especially as the atria tend to quiver and squeeze blood into the ventricles.
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| Dysrhythmias are abnormal cardiac rhythms that occur because of either ________________ or __________________. | show 🗑
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| Antidysrhythmics act by _________________ or __________? | show 🗑
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| Many antidysrhythmic drugs can make things worse. What is this called? | show 🗑
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| What does it mean that drugs have effects which are state-dependent? Is this good or bad? | show 🗑
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sam_melillo
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