Basic EKG principals Flashcards
The EKG results from electrical changes associated with activation first of the
atria and then of the ventricles.
Atrial depolarization causes the
P wave
Ventricle depolarization causes the
QRS
Regarding the QRS, if the first deflection is downward it is a
Q wave
Regarding the QRS, any upward deflection is an
R wave
Regarding the QRS, a downward deflection after the R wave is a
S wave
When the depolarization wave spreads toward a lead, the deflection is
Predominately upward
When the depolarization wave spreads away from a lead, the deflection is
predominately downward
Name the six limb leads___.
I II III VR VL VF
The six limb leads look at the heart from the
sides and the feet in a vertical plane
The cardiac axis is estimated from leads
I, II, and III.
The cardiac axis is the average
direction of spread of depolarization as seen from the front.
The chest or V leads look at the heart from the
front and the left side in a horizontal plane.
Lead V1 is positioned over the
right ventricle
Lead V6 is positioned over the
left ventricle