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Basic EKG InterpretationReviewDr Chow
Chow2Basic EKG InterpretationObjectivesUpon completion of this workshop, each participant should be able to:1. Describe and discuss the cardiac conduction system.2. Demonstrate the 5 steps in basic EKG interpretation.3. Describe the characteristics of Sinus, Junctional andVentricular rhythms.4. Identify the following waveforms making up an EKG tracing:a. P-waveb. PR intervalc.QRS complexd. ST segmente.T wavef.QT interval5. Measure a PR Interval and a QRS Complex6. Recognize the following EKG tracings:a.Sinus rhythmb. Sinus Bradycardiac.Sinus Tachycardiad. Junctional Rhythms (Escape, Accelerated, and Tachycardia)e.Ventricular Rhythms (Escape and Accelerated)f.Ventricular Tachycardiag. Ventricular Fibrillationh. Atrial Fibrillationi.Atrial Flutterj.Paced Rhythms (Failure to Sense and Failure to Capture)k. PEA7. Identify common interventions and medications for specific rhythms
Cardiac Conduction:Sino-Atrial Node:(SA Node) primary pacemaker of the heart. Initiatesall Sinus Rhythms. Intrinsic Rate of 60-100/minuteAtrial Ventricular Node:Intrinsic Rate of 40-60/minute. AV Junctioninitiates all junctional rhythms.Bundle of His:Makes up part of the AV junction. Connects the atriaand ventricles electricallyBundle Branches:Right and Left Bundle Branches allow rapidelectrical conduction to both ventricles. (Divide and conquer)Purkinje fibers:permeate into 1/3 of the ventricle. Has intrinsic rate of20- 40/minute. All rhythms initiated in the ventricles are Ventricular.
Atrial Depolarization:Depolarization is electrical impulses spreading through the electricalconduction system. Depolarization results in change in electrical charge ofcells causing muscle fibers to contract. Atrial Contraction provides an atrialkick which allows for better filling of the ventricles. Loss of the atrial kickcan decrease cardiac output by 30%.Ventricular Depolarization:Ventricular Repolarization:
P Wave and PR Interval:Represents SA node and Atrial depolarizationShould all look alikePR interval = time it takes for the impulse to get through the AV nodeNormal PR interval is .12 to .20 secondsProlong FIXED PR interval = 1stdegree A-V blockQRS Complex:Q is downward deflection before the RR is the first upward deflectionS is the downward deflection after the RQRS is measured from where it leaves the baseline to where itcomes back to the baseline.06-.10 secondsRepresents Ventricular Depolarization
Q Wave:First downward deflection of the QRS complex. Normally notsignificant and sometimes not visible. Significant if more than 25% of theQRS complex and greater than .04 seconds.

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Term
Summer
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Tags
Cardiac electrophysiology, QRS complex, Q

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