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ECG Parts
Key parts and lengths of the ECG
15
Medical
Graduate
09/27/2010

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Cards

Term
P wave
Definition
Atrial depolarization
Term
QRS complex
Definition
Ventricular depolarization (and hidden atrial repolarization)
Term
T wave
Definition
Ventricular repolarization
Term
PR interval (From the start of the P wave to the start of the QRS)
Definition
0.12-0.20 seconds
Term
QRS Interval (start of the Q to the end of the S)
Definition
Should be less than 0.12 seconds
Term
Q wave
Definition
Should be less than one box in height (distance from the baseline)
Term
Length of each small box
Definition
0.04 seconds
Term
Left Axis Deviation (LAD)
Definition
When Lead I is + but aVF is - (patient's upper left quadrant)
Term
Normal
Definition
When aVF and Lead I are + (patient's lower left quadrant)
Term
Right axis deviation
Definition
When aVF is + but Lead I is - (patient's lower right quadrant)
Term
Extreme Right Axis Deviation (No Man's Land)
Definition
When both aVF and Lead I are - (patient's upper right quadrant)
Term
SA node's intrinsic rate
Definition
60-100 bpm
Term
AV node's intrinsic rate
Definition
40-60 bpm
Term
Ventricle's intrinsic rate
Definition
20-40 bpm
Term
300, 150, 100, 75, 60, 50
Definition
Order for calculating rate
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