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Carnegie ECG

the normal cardiac conduction cycle

QuestionAnswer
isoelectric line before P wave equals SA node firing
P wave equals atrial depolarization
PR segment equals av node delay, His, BBs, PFs
QRS complex equals ventricular depolarization, muscle cells depolarize
ST segment equals ventricular repolarization
T wave equals ventricular repolarization
isoelectric line after T wave equals resting phase; relaxation, filling
what papers speed is used when running an ECG? 25 millimeters per second
1 millimeter on the ECG paper equals how much time? . 04 seconds
1 millimeter equals how much voltage? . 1 millivolts
10 millimeters equals how many millivolts? 1mv
one big box equals .20 seconds
lower case letters represent less than 5 boxes
uppercase letters represent 5 boxes or more
The Q wave is the first negative
the R wave is the first positive
The S wave is the first negative after first positive
the QRS complex duration is less than. 10 seconds
A normal PR interval is .12-. 20 seconds
the PR interval is made up of the P wave and the PR segment
which wave represents atrial depolarization? The P wave
which wave represents ventricular depolarization? The QRS complex
which wave represents ventricular repolarization? T waves
Created by: ICVT2b
 

 



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