Project: Ghana Emergency Medicine Collaborative Document Title: Cardiology – EKG Interpretation Author(s): Patrick Carter (University of Michigan), MD 2012 License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution Share Alike-3.0 License: http://creativecommons.org/licenses/by-sa/3.0/

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5@<"=2*'+"2>4"?>7'3*26+"•  P wave: the sequential activation

(depolarization) of the right and left atria

•  QRS complex: right and left ventricular depolarization (normally the ventricles are activated simultaneously)

•  ST-T wave: ventricular repolarization

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5@<"=2*'+"2>4"?>7'3*26+"•  U wave: origin for this wave is not clear - but

probably represents "after depolarizations" in the ventricles

•  PR interval: time interval from onset of atrial depolarization (P wave) to onset of ventricular depolarization (QRS complex)

•  QRS duration: duration of ventricular muscle depolarization

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5@<"=2*'+"2>4"?>7'3*26+"•  QT interval: duration of ventricular depolarization

and repolarization

•  RR interval: duration of ventricular cardiac cycle (an indicator of ventricular rate)

•  PP interval: duration of atrial cycle (an indicator or atrial rate)

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19232(7'3-+)(+"/0"2"h:/(234-26"?>023(7"A.  Anterior Infarction

A.  V1,V2,V3,V4 B.  Left Anterior Descending (LAD)

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C.  Posterior Infarction A.  Depression in V1,V2,V3 B.  Right Coronary C.  Provides blood supply to SA Node, AV Node, His Bundle

D.  Inferior Infarction A.  II, III, AVF B.  Right or Left Coronary

A.  Most Commonly Right Coronary

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Tachycardia Narrow Complex Wide Complex

Regular ST SVT Atrial flutter

ST w/ aberrancy SVT w/ aberrancy

VT

Irregular A-fib A-flutter w/ variable conduction MAT

A-fib w/ aberrancy

A-fib w/ WPW VT

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Retrograde P waves

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