EKG #1 Flashcards
SA node intrinsic rate
60-100
atrial foci intrinsic rate
60-100
AV node intrinsic rate
40-60
ventricular foci intrinsic rate
20-40
why does the conduction velocity decease at the AV node
to allow for ventricular filling
Pacemaker: Cells that display
automaticity
conduction velocity at AV node
.01-.05
at rest cardiac cells are
polarized + on the outside
If the electrical signal is moving towards the electrode what way is the deflection on the wave from
up (+)
The basic triage shape of the EKG is called what
Einthoven’s triangle
Lead I goes from (?) + ot -
right arm to left arm both sides are -
Lead II direction and polarity
right arm left foot, both +
Lead III direction and polarity
left hand to left foot arm + foot -
what is the primary lead we look at
II
AVR, AVL, AVF are called what kind of leads
augmented
what side of the agumneted leads are +
the positive
what plane are the limb leads in
frontal
what plane are the pre cordial leads in
Transverse
Locations of the precordial leads
V1 – fourth intercostal space (ICS) to the right of the sternum
V2 – fourth intercostal (ICS) space to the left of the sternum
V3 – midway between V2 and V4
V4 – fifth intercostal space (ICS) at the midclavicular line
V5 – anterior axillary line at the same level as V4 (5th intercostal space)
V6 – midaxillary line at the same level as leads V4 and V5
are the precoardial leads biporlar or uni polar
unipolar
