Electrocardiography Flashcards
(23 cards)
what does the plateu phase look like on an ecg
flat line on ecg
what is the RMP (value)
-85
what charge is the inside at RMP
- the inside is negative
- when the heart is at rest, there is no charge difference = flat line
diastole
heart muscles are relaxed and fill with blood
systole
heart muscles are contracting and blood is pumped out of the heart into the arteries
autorhythmic cells
SA node- AV node, Bundle of his - purkinjie fibers
plateu phase
myocardium is fully depolarised (flat line)
repolarization deflection
no deflection - not clear
s wave direction
always down
r wave direction
always up
chest leads direction
horizontal
limb leads direction
vertical
two properties of chest leads
- unipolar
- positive electrode
V1
4th ICS right side of sternum
V2
4th ICS left side of sternum
V6
6th ICS mid axilla line
V3, V4, V5
in between - equidistant
which leads are bipolar
- standard leads
- so they are given both a positive and negative charge
- signal moves from negative to positive
limb leads advantage
- can be used to determine electrical axis
- placed on the bony parts
lead 2
right arm to left leg
lead 1
right arm to left arm
lead 3
left arm to left leg
view of avR
NON SPECIFIC VIEW
