Card Set Information
Where is impulse generated?
Sinoatrial (SA) node - right atrium near Sup. VC
Where is the AV node?
Posterior septal wall of right atrium near tricuspid valve
What is the order of conduction?
AV (His) bundle
Right/Left bundle branches
Purkinje fiber network
What are the Bipolar limb leads?
I - right arm to left arm
II - right arm to left leg
III - left arm to left leg
What are the Augmented unipolar limb leads?
aVR - V to right arm
aVL - V to left arm
aVF - V to left leg
What is the triangle made up by the bipolar limb leads?
What is responsible for the P wave?
Atrial muscle depolarization
What is responsible for the QRS complex?
also, atrial repolarization
Measure of conduction through the AV node
Measure of time where all myocardium in Phase 2 plateau state
What is responsible for the T wave?
Repolarization of the ventricles
What is responsible for the U wave?
Repolarization of myocardial "M" cells
What are the leads of a 12 lead ECG?
Bipolar (I, II, III)
Augmented unipolar (aVR, aVL, aVF)
Precordial leads (V1-V6)
3. Sinus rhythm
1. >100 bpm
2. <60 bpm
3. impulse originates at SA node
Define Mean QRS Vector
How to determine?
Sum of all vectors in ventricles during depolarization
Closest to most positive lead
If both I and aVF have positive QRS, then probably normal