Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

ECG Rhythm Interpretation: Normal Sinus Rhythm and Arrhythmias, Slides of Cardiology

A part of an ecg rhythm interpretation module on docsity.com. It focuses on normal sinus rhythm, its parameters, and the formation of arrhythmias. Various types of arrhythmias, including those arising from problems in the sa node, atrial cells, av junction, and ventricular cells.

Typology: Slides

2011/2012

Uploaded on 10/19/2012

amla
amla 🇮🇳

4.5

(13)

86 documents

1 / 14

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
ECG Rhythm Interpretation
Module III
Normal Sinus Rhythm
Docsity.com
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe

Partial preview of the text

Download ECG Rhythm Interpretation: Normal Sinus Rhythm and Arrhythmias and more Slides Cardiology in PDF only on Docsity!

ECG Rhythm Interpretation

Module III

Normal Sinus Rhythm

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 Sinus Rhythm (NSR)

  • Etiology: the electrical impulse is formed in the SA node and conducted normally.
  • This is the normal rhythm of the heart; other rhythms that do not conduct via the typical pathway are called arrhythmias.

NSR Parameters

  • Rate 60 - 100 bpm
  • Regularity regular
  • P waves normal
  • PR interval 0.12 - 0.20 s
  • QRS duration 0.04 - 0.12 s

Any deviation from above is sinus tachycardia, sinus bradycardia or an arrhythmia Docsity.com

SA Node Problems

The SA Node can:

  • fire too slow
  • fire too fast

Sinus Bradycardia Sinus Tachycardia

Sinus Tachycardia may be an appropriate response to stress.

Atrial Cell Problems

Atrial cells can:

  • fire occasionally from a focus
  • fire continuously due to a looping re-entrant circuit

Premature Atrial Contractions (PACs)

Atrial Flutter

Atrial Cell Problems

Atrial cells can also:

  • fire continuously from multiple foci or fire continuously due to multiple micro re-entrant “wavelets”

Atrial Fibrillation

Atrial Fibrillation

Teaching Moment

Multiple micro re- entrant “wavelets” refers to wandering small areas of activation which generate fine chaotic impulses. Colliding wavelets can, in turn, generate new foci of activation.

Atrial tissue

Ventricular Cell Problems

Ventricular cells can:

  • fire occasionally from 1 or more foci
  • fire continuously from multiple foci
  • fire continuously due to a looping re-entrant circuit

Premature Ventricular Contractions (PVCs) Ventricular Fibrillation

Ventricular Tachycardia

End of Module III

Normal Sinus Rhythm

Proceed to Module III Practice Quiz on WebCT