This document provides an overview of Module I of an ECG rhythm interpretation course. The module introduces ECG basics including normal impulse conduction through the heart, the components of the ECG waveform, and normal pacemakers of the heart. It describes how to analyze an ECG including identifying the P wave, QRS complex, T wave, and PR interval. It also reviews the layout of the ECG paper including time and voltage measurements. The document directs the reader to proceed to a practice quiz after reviewing the basics covered in Module I.

1. FOR MORE FREE MEDICAL POWERPOINT PRESENTATIONS VISIT WEBSITE www.medicalppt.blogspot.com

2. ECG Rhythm Interpretation Module I ECG Basics

3. 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.

4. Learning Modules ECG Basics How to Analyze a Rhythm Normal Sinus Rhythm Heart Arrhythmias Diagnosing a Myocardial Infarction Advanced 12-Lead Interpretation

5. Normal Impulse Conduction Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers

6. Impulse Conduction & the ECG Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers

7. The “PQRST” P wave - Atrial depolarization T wave - Ventricular repolarization QRS - Ventricular depolarization

8. 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)

9. 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.

10. The ECG Paper Horizontally One small box - 0.04 s One large box - 0.20 s Vertically One large box - 0.5 mV

11. The ECG Paper (cont) 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. 3 sec 3 sec

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

13. FOR MORE FREE MEDICAL POWERPOINT PRESENTATIONS VISIT WEBSITE www.medicalppt.blogspot.com