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25 Cards in this Set
- Front
- Back
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What is the Q phase |
Depolarization of the AV node |
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What is the R phase |
Depolarization of the IV septum |
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What is the S phase |
Complete depolarization of the Ventricles |
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What is the QRS phase |
Complete ventricular contractions |
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How long should QRS last |
.06 - 1 seconds |
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What is the P wave
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Atrial Depolarization |
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How long does P wave last
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0.08 - 0.1 Seconds |
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What is T wave |
Ventricular Repolarization |
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Which Layer of the Heart Depolarizes first |
Endocardium |
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Which layer of the heart repolarizes first
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Epicardium |
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What is the P-R interval and how long does it last.
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.12 - .2 seconds
Used to assess AV delay and conduction speed Shorter = Higher HR Longer = Lower HR |
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What is the S-T segment |
Period of Electrical Neutrality Plateau period of the action potential Ventricles are completely depolarized |
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What is the Q-T interval and how long does it last and what does it diagnose |
02-.4 Seconds Period of Ventricular Systole Faster HR = Shorter Q-T interval because action potential is shorter Diagnostic for Long QT syndrome |
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What is the T-P segment (Interval) |
Atrial and Ventricular Diastole |
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What is the R-R interval
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Reflects the time of a single heart beat |
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What is SInus arrythmia |
Change in HR with the respiratory cycle Inspiration = increase HR Expiration = decrease in HR |
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What causes pathological arrhythmias |
Altered Conduction Altered Automaticity (SA Node) |
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What is a 1st degree AV Block |
Prolonged PR Interval (Greater than 0.20 sec) No treatment necessary |
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What are the types of 2nd Degree Block |
1. Mobitz Type I 2. Mobitz Type II 3. Bundle Branch Blcok |
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What is Mobitz type 1 block |
Defect in AV node causing progressively longer P-R interval No Treatment Necessary |
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What is Mobitz Type 2 Block |
P-R interval is constant but every nth QRS complex is missing Defect is below AV node so PR interval not changed Needs Pacemaker in either atria or ventricle |
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What is a bundle Branch Black |
Impulse spreads slowly through ventricles causing extended QRS complex. Right bundle branch block = Bunny ears Left Bundle Branch Block = Notch Top |
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What is a 3rd degree block |
Complete conduction block No impulse through AV node Atrial and ventricles are in Electric Isolation Ventricles beet at rate of purkinje fibers (20-40 bpm) CO and BP compromised Needs Pacemaker |
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What is Atrial Fibrillation
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No detectable P- Waves Regular R-R interval (Heart Rate) |
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What is Ventricular Fibrillation |
Wavy Baseline No Coordinated Ventricular Contraction Decreased CO and Mean Arterial Pressure Needs Defibrillation and CPR |
