EKGs Flashcards
what bundles caries the message from the RA to the LA?
bachmann’s bundle
what does the p wave indicate
atrial depolarization
with a right bundle branch block what will happen?
The QRS will be wider
what does the t wave represent
ventricular repolarization
what should the QRS be less than?
120 msec
time it takes to conduct through the AV node
PR segment
how long should the PR interval be?
0.12-0.20 sec
if there is an incomplete bundle branch block what will the length of the QRS be?
100-120
when would the PR interval be less than 120 msec? there is a delta wave
Wolff-Parkinson-White
What causes the delta wave with Wolff-Parkinson-White
accessory pathway
get an early depolarization of ventricles
“slurring” of the R wave
why is the only way to get the conduction from atria to ventricles an AV node?
non-conductive material between
if the PR interval is longer than 200 msec what in there?
a block
when should the T wave end?
before 1/2 the distance b/w each R wave
what happens when the T wave ends longer than 1/2 the distance b/w R waves
Long QT interval
what is limb lead I
right arm to left arm
what is limb lead II
right arm to left leg
avR
right shoulder
avF
foot (vertical line)
avL
left shoulder
for inferior what 3 leads do you look at?
II, III, aVF
what leads tell you the lateral side of the heard?
I, aVL, V5, V6
what leads tell you the septal part of the heart
Vi, V3
what leads for anterior part of the heart
V3,V4
if the movement of electricity is traveling towards the positive end of the lead what do you get?
a positive deflection above baseline