unit 5 big test
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what is cardiac output- definition and formula
how effectively the heart is pumping. stroke volume multiplied by HR
what does automaticity refer to
the ability to initiate signals
what does irritability refer to
the ability to respond to signals
what does conductivity refer to
the ability to pass on a signal
what is the path of electricity in the heart
the SA node, intraarterial tracts and Backman’s Bundle, internodal tracts, the AV node, the bundle of His, bundle branches, purkenji fibers
what brings the electrical impulse to the LA
Bachman’s bundle
what happens to the impulse at the AV node
it pauses, allowing the atria to empty
what is the inherent rate of the SA node
60-100
what is the inherent rate of the AV junction
40-60
what is the inherent rate of the purkenji fiberes
20-40
what does the P wave represent
atrial depolarization
what does the PR segment represent
atrial systole and the pause at the AV node
what does the PR interval represent. where do you measure it?
the whole atrial cycle except repolarization. measure from beginning of P to Q
what does the QRS complex represent
ventricular depolarization
what does the ST segment represent. where do you measure it
from the end of S to the beginning of T. it represents ventricular systole.
what does the QT interval represent
the complete ventricular cycle
what does the t wave represent
ventricular repolarization
what does the U wave represent
late repolarization, which is not usually seen
what does the Ta wave represent
atrial repolarization, not usually seen as it’s hidden in the QRS
what is the appropriate measurement for the PR interval
0.12-0.20 seconds
what is the appropriate measurement for the QT interval
0.36-0.44 seconds
how do you use the 6 second method
count number of QRS in six seconds and multiply by 10
how do you use the 1500 method
count the small boxes between QRS complexes and divide 1500 by the number you counted.
how do you use the 300 method
count the number of big boxes between QRS and divide 300 by the number of boxes