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