Module 1exf ppt

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ECG Rhythm Interpretation Module I ECG Basics

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Course Objectives • To recognize the normal rhythm of the heart - “Normal Sinus Rhythm.”

• To recognize the 13 most common rhythm disturbances. • To recognize an acute myocardial infarction on a 12-lead ECG. For more presentations www.medicalppt.blogspot.com

Learning Modules • • • • • •

ECG Basics How to Analyze a Rhythm Normal Sinus Rhythm Heart Arrhythmias Diagnosing a Myocardial Infarction Advanced 12-Lead Interpretation For more presentations www.medicalppt.blogspot.com

Normal Impulse Conduction Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers For more presentations www.medicalppt.blogspot.com

Impulse Conduction & the ECG Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers For more presentations www.medicalppt.blogspot.com

The “PQRST” • P wave - Atrial depolarization • QRS - Ventricular depolarization

• T wave - Ventricular repolarization For more presentations www.medicalppt.blogspot.com

The PR Interval Atrial depolarization + delay in AV junction (AV node/Bundle of His)

(delay allows time for the atria to contract before the ventricles contract) For more presentations www.medicalppt.blogspot.com

Pacemakers of the Heart • SA Node - Dominant pacemaker with an intrinsic rate of 60 - 100 beats/minute.

• AV Node - Back-up pacemaker with an intrinsic rate of 40 - 60 beats/minute. • Ventricular cells - Back-up pacemaker with an intrinsic rate of 20 - 45 bpm. For more presentations www.medicalppt.blogspot.com

The ECG Paper • Horizontally – One small box - 0.04 s – One large box - 0.20 s

• Vertically – One large box - 0.5 mV

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The ECG Paper (cont) 3 sec

3 sec

• Every 3 seconds (15 large boxes) is marked by a vertical line. • This helps when calculating the heart rate. NOTE: the following strips are not marked but all are 6 seconds long. For more presentations www.medicalppt.blogspot.com

End of Module I ECG Basics Proceed to Module I Practice Quiz on WebCT

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