initial ventricular activation
plateau of the action potential
atrial depolarization - right atrium first then left atrium
sinus node is before the P wave but is too small to be recorded
from initiation of atrial to initiation of ventricular activation
sum of total AP in the ventricles
Bipolar lead I
left arm (LA) minus right arm (RA) (left arm positive)
Bipolar lead II
left leg (LL) minus right arm (RA) (LL positive)
Bipolar lead III
left arm (LL) minus LA (LL positive)
Which leads are the best to see P waves?
II and VI
Which leads are the best to see the anterior part of the left ventricle?
leads V1 - V4
Which leads are the best to see the lateral part of the left ventricle?
leads I, aVL, V4 - v6
Which leads are the best to see the inferior part of the left ventricle?
leads II, III, and aVF
a squalene triangle that describes the positioning of the leads in regards to the body and the heart
however, this makes calculations difficult, so an equilateral triangle is used instead
a representation of the limb leads using an equilateral triangle to make calculations easier