EKG I Flashcards
P wave represents
depol of atrial contractile cells
QRS complex represents
depol of ventricular contractile cells
T wave represents
repol of ventricular contractile cells
REpolarization =
REstores the neg charge
(the wave’s) R side of P wave represents
right atrial depol
(the wave’s) L side of P wave represents
left atrial depol
PR segment represents
conduction pause at the AV node
atrial repol is where on an EKG
not seen
PR segment is from end of _____ to start of _____
end of atrial depol
->
start of ventricular depol
PR interval is from start of _____ to start of _____
start of atrial depol
->
start of ventricular depol
atrial depol occurs _____ (one word)
spontaneously
part of ventricles that depol first
septum
-> then goes outward
part of ventricles that repol first
apex
-> then goes upward
QRS interval represents
the time it takes for ventricular depol
ST segment is from end of _____ to start of _____
end of ventricular depol
->
start of ventricular repol
QT interval is from start of _____ to end of _____
start of ventricular depol
->
end of ventricular repol
depol moving towards electrode
depol @ electrode, moves back to baseline
depol moving away from electrode
repol moving towards electrode
repol @ electrode, moves back to baseline
repol went past electrode, now too far, goes back to baseline
repol moving away from electrode
which leads look at LEFT LATERAL side of heart
lead I
lead aVL
V5
V6
which leads look at INFERIOR heart
lead II
lead III
lead aVF
which leads looks at RIGHT side of heart
lead aVR
V1
which leads look at ANTERIOR heart
V2
V3
V4
what are precordial leads
chest leads
V1-V6
V1 location
4th intercostal space- to the right of the sternum
V2 location
4th intercostal space- to the left of the sternum
V3 location
between V2 and V4
V4 location
5th intercostal space- left midclavicular line
V5 location
between V5 and V6
V6 location
5th intercostal space- left midaxillary line
define “a single vector”
average direction myocyte charges (current flow) are headed in
how many stickers (electrodes) and how many leads are used for an EKG
10 stickers (electrodes)
12 leads
a 12 lead EKG gives you how many views of the heart
12
Q wave represents
septum depol
size of R wave if right ventricle dominant
small
size of R wave if left ventricle dominant
large
equation for QT interval
QT = VD + RP + VR
(= QRS wave + ST seg + T wave)
VD: ventricular depol
RP: refractory period
VR: ventricular repol
why is QT elongation bad
more time for arrhythmia to happen
normal size for QT interval
< 50% of R-R interval
