12 Lead EKG Flashcards
What polarity is the right arm for leads?
Always negative
Who invented the Electrocardiogram?
Einthoven
What polarity is the left leg for limb leads?
Always Positive
Which limb lead can be either positive or negative polarity?
Left arm
What are he three different types of ECG leads?
Bipolar, unipolar, precordial
Which limb leads are bipolar?
I, II, and III
What is the normal polarity of cardiac cells?
Polarized
What occurs when cardiac cell depolarization occurs?
Sodium enters into the cell and Potassium exits from the cell
What pathways connect the SA node to the AV node?
Internodal pathways
In a 12 lead how should a QRS complex appear on aVR?
Negative
What are the first four things you look at for a 12 lead?
First impression
Rate
Rhythm
Axis
What are things to consider with wide QRS?
Ventricular Focus
Paced Rhythm
Right or left block
How do you determine right or left branch blocks?
Wide
negative deflection (Left branch)
positive deflection (Right branch)
How to determine axis in 12 lead?
Look at lead 1 and aVF and determine whether most of the rhythm occurs above or below the isoelectric line
How should ST segments appear?
at the isoelectric line
