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ECG Rhythm Interpretation: Understanding Normal Heart Rhythms and Common Disturbances, Slides of Cardiology

A part of an online course on ecg rhythm interpretation offered by docsity.com. It covers the basics of ecg, impulse conduction, the pqrst complex, the pr interval, and pacemakers of the heart. The course objectives include recognizing the normal rhythm of the heart, common rhythm disturbances, and diagnosing a myocardial infarction.

Typology: Slides

2011/2012

Uploaded on 10/19/2012

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ECG Rhythm Interpretation
Module I
ECG Basics
Docsity.com
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ECG Rhythm Interpretation

Module I

ECG Basics

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.

Normal Impulse Conduction

Sinoatrial node

AV node

Bundle of His

Bundle Branches

Purkinje fibers

Impulse Conduction & the ECG

Sinoatrial node

AV node

Bundle of His

Bundle Branches

Purkinje fibers

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) Docsity.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.

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