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Basic ECG Interpretation Study guide.

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Basic ECG Interpretation Study guide.

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  • October 12, 2024
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  • 2024/2025
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Basic ECG Interpretation Study guide
Basic ECG Interpretation
-Normal conduction system = electrical impulses

-Components of an ECG complex

-Determining rate & regularity

-Measuring intervals (PR, QRS & QT)

-Identify: Normal Sinus Rhythm, Sinus Bradycardia, Sinus Tachycardia
& Sinus Arrythmia & Treatment for each
Conduction System of the Heart




Cardiac Conduction System




"Primary Pacemaker" of heart's conduction system?
-SA node: 60-100
Inherent Rates

, -SA Node: 60-100

-AV node: 40-60 (can take over when SA node fails)

-Purkinje Fibers: 15-40
ECG Complex
-Bottom line = "isoelectric line"

-Waves should leave isoelectric line and come back to it

-Each box represents 0.04 seconds

-K+ inside cardiac cells and Na+ outside cardiac cells; this switches
when we have electrical movement (e.g., atrial depolarization)




P Wave [Atrial depolarization]
-The P wave indicates atrial depolarization or atrial
contraction or SA node activity

-So if the question is "How long does it take the atria to depolarize?" -
look at the P wave and count the boxes!




PR Interval (PRI) - [Start of Atrial depolarization to start of Ventricular
depolarization]

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