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Terms in this set (16)
general definition of electrocardiograpghy
non-invasive way to measure cardiac electrical activity (galvanometer)
what is necessary for a galvanometer to work/detect a signal?
must have a DIFFERENCE in POLARITY
A completely polarized or depolarized muscle will show no signal
what are the 2 rules of electrocardiography
1. depolarization moving toward the positive electrode = + deflection
2. deflection size is proportional to muscle mass
what type of deflection should I expect to see if the wave of depolarization is moving toward the positive electrode?
positive (line moving up)
what type of deflection should I expect to see if the wave of depolarization is moving away from the positive electrode?
negative (line going down)
what type of deflection should I expect to see if the wave of depolarization is moving perpendicular to the positive electrode (left)?
none (flat line)
on what side of the heart is the positive electrode placed?
on what side of the heart is the negative electrode placed?
what does the P wave represent?
atrial depolarization (end of P wave = complete atrial depolarization)
what does the PR segment represent
depolarization through the AV node
what does the Q-wave represent
depolarization through the bundle of His and Purkinji system. This happens from LEFT TO RIGHT in the septum which results in a NEGATIVE deflection
what does the R wave represent
depolarization of the ventricles(thick muscles = large positive deflection)
what does the S wave represent
depolarization near the atrium. The moving away from the positive lead results in a negative deflection
progression of ventricular depolarization
time between depolarization and repolarization
repolarization (from epicardium to endocardium)
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