Term
| What is the sequence of 12-Lead Analysis? |
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Definition
*Rate
*Rhythm
*Axis
*Hypertrophy
-Bundle Branch Block
*Ischemia/Infarction |
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Term
| How many fascicles are there in the Left bundle? |
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Definition
| *Three- Anterior, posterior and septal fascicle. |
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Term
| What are some causes of right axis deviation? |
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Definition
*Normal in adolescents and in children
*Right ventricular hypertrophy
*Left posterior hemiblock
*PHTN (COPD, emphysema)
*Dextrocardia
*Ectopic ventricular beats and rhythms |
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Term
| What are some causes of left axis deviation? |
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Definition
*Left anterior Hemiblock (LAH)
*Ectopic ventricular beats and rhythms
*MI
*Pregnancy |
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Term
| What are the leads used to determine axis? What is the system called? |
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Definition
*Leads I, II, III, aVR, aVL, aVF
*Hexaxial lead system |
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Term
| What does pathologic left axis deviation indicate? |
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Definition
| * Left anterior hemiblock |
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Term
| What is the most common cause of a left anterior hemiblock? |
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Definition
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Term
| What is diagnostic for RVH? |
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Definition
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Term
| What does the small R wave in V1 represent? |
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Definition
| *Interventricular septum depolarization |
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Term
| What amplitude and duration does one little box represent? |
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Definition
*Amplitude: 1mm
*Duration: 40msec (0.04 sec)
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Term
| What does one large box represent in amplitude and duration? |
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Definition
*Amplitude: 5mm
*Duration: 200msec or 0.2sec |
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Term
| What is a normal standardization mark? |
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Definition
| *Typically 10mm high and 0.2 sec long |
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Term
| What part of the ECG is considered the baseline? |
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Definition
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Term
Why is there a delay in AV junction?
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Definition
*To protect ventricle from rapid rates
*To allow the heart to work as an effective pump (allows time for filling) |
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