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What does an EKG record?
electrical activity of the heart
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What occurs during depolarization?
contraction
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Where is the SA node?
Upper right wall of Right Atrium
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What is the BPM of the SA Node?
60-100
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Where is the AV Node?
Floor of Right Atrium
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What is the main purpose of the AV Node?
To delay the impulse from the SA node to the bundle of His
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Describe the route of electrical impulse
SA Node >AV Node >Bundle of His > L/R bundles > Purkinje Fibers
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What is the P Wave?
depolarization of atria
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What is the QRS wave?
Ventricular depolarization
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What occurs during the ST segment?
plateau of repolarization
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What occurs during the T wave
Final rapid repolarization
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When does systole occur?
Q-T interval
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How long is the PR interval? **
< .2 sec
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How long is the QRS? **
<.08 sec
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How long is the QT? **
< .4 sec
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Which is the main lead used?
II
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How much is each small box worth?
.04 sec
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How much is each lg box worth?
.20 sec
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What are the numbers you need to remember to determine heart rate?
300-150-100-75-60-50
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How many ticks do you need to have to determine a HR?
2
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How do you determine Atrial Flutter?
Saw tooth PT waves, QRS fairly normal
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What is Atrial Flutter?
when the atrias are irritated, there's extra stimulation (NOT contraction) from atrias
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Atrial Flutter:
Atrial bpm <,=,> Vent. bpm
Atrial bpm > Ventricular bpm
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What is unique about atrial fibrillation?
- Irregularly Irregular
- wavy P waves, and irregular QRS rate
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Describe Premature Ventricular Contractions
- extra beat in QRS
- occurs from decreased O2 or K
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Describe V.Tach (V Flutter)
- 150-250 bpm
- Large QRS, no PT
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Describe V Fibrillation
- Twitching ventricles
- no rhythym or waves at all
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What is heart block describing
an irregular delay in the AV node
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Describe 1st degree heart block
- AV node is delaying impulse > .2 sec (PR interval)
- Will be consistent
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Describe 2nd degree heart block (Mobitz 1)
- Going, Going, Gone
- Normal PR interval, then longer and longer
- irregular pulse occuring regularly
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Describe 2nd degree heart block (Mobitz 2)
- 2:1 - 2P waves then QRS
- 3:1 - 3P waves then QRS
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Describe 3rd degree heart block
- AV Node is completely blocked
- there's no communication between atria and ventricles
- QRS is very wide, p waves are normal
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