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20 Cards in this Set
- Front
- Back
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Name the three major pacemaker cells and their rates of automaticity:
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1. SA Node, 60-100 bpm
2. AV Node, 40-60 bpm 3. Purkinje / ventricle muscle, 20-30 bpm |
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What is an ectopic pacemaker?
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Any pacemaker other than the SA node
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a) What is an early beat from the atria called?
b) A late beat from the AV node? |
a) Premature atrial contraction
b) Junctional escape beat |
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List the five step approach to reading ECGs
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1) Rate
2) Rhythm 3) P wave 4) PR interval 5) QRS complex |
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What are normal values for PR interval?
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less than 0.11 sec is too short, greater than 0.20 sec is too long
(approx 3-5 small boxes) |
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What condition is present if P waves don't give rise to QRS complex?
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Heart block
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What is the normal length of the QRS interval?
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0.06-0.11 sec
approx 1.5-3 small boxes |
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Which leads would be effected by a septal wall M.I?
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V1+V2
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What leads would be effected by an inferior wall MI?
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II, III, aVF
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Which leads are effected by a lateral wall MI?
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V5, V6
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Which leads are affected by anterior wall MI?
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V3, V4
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What area of the heart do leads II, III and avF detect?
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Inferior Wall
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What areas of the heart do leads V1 and V2 detect?
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Septal Wall
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What areas of the heart do leads V3, V4 detect?
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Anterior Wall
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What areas of the heart do leads V5, V6 detect?
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Lateral Wall
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What plane do the hexaxial limb leads sit in?
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coronal plane (frontal plane)
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What plane do the precordal leads sit on?
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Transverse plane; splits heart onto top/bottom halves
(Axial plane) / horizontal plane |
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Draw Einthroven's Triangle
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check notes
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How much time does each small box on an ECG represent?
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1/25 second (0.04 sec)
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What does the p-wave represent? Axis? Normal duration?
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Atrial depolarization
Axis: 0 to +75' (downward and to the left) Duration 0.08 --> 0.11 sec |
