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Carnegie ECG
the normal cardiac conduction cycle
Question | Answer |
---|---|
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 |