The 12Lead EKG Chapter 12 - PowerPoint PPT Presentation

Loading...

PPT – The 12Lead EKG Chapter 12 PowerPoint presentation | free to view - id: 86175-ZDc1Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

The 12Lead EKG Chapter 12

Description:

The 12Lead EKG Chapter 12 – PowerPoint PPT presentation

Number of Views:46
Avg rating:3.0/5.0
Slides: 16
Provided by: X359
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: The 12Lead EKG Chapter 12


1
The 12-Lead EKGChapter 12
  • Robert J. Huszar, MD
  • Instructor
  • Patricia L. Thomas, MBA, RCIS

2
Outline
  • Electrical Axes and Vectors
  • The electrical current, vectors, and the lead
    axis
  • The hexaxial reference figure
  • The QRS axis
  • Determination of Axis

3
Electrical Axes Vectors
  • Instantaneous cardiac vector-the electrical
    current generated by the depolarization or
    repolarization of the atria or ventricles at any
    given moment
  • Graphically as an arrow that has magnitude,
    direction, and polarity
  • Length of the shaft of the arrow represents the
    magnitude of the electrical current
  • Orientation or position of the arrow indicates
    the direction of flow of the electrical current
  • The tip of the arrow represents the positive pole
    of the electrical current
  • The tail is the negative pole

4
(No Transcript)
5
Magnitude, Direction, and Polarity
6
Normal DepolarizationFigure 12-2
  • Interventricular Septum 1 2
  • Right Ventricle 3
  • Left Ventricle (thick lateral portion) 3
  • Left Ventricular (lateral/posterior/base) 4

7
(No Transcript)
8
The Hexaxial Reference Figure
  • Composite of the two triaxial reference figures
    (limb leads augmented leads)
  • Purpose is to determine the direction of the QRS
    axis
  • Each - pole is assigned a degree number 00 to
    1800
  • The top are given numbers
  • The bottom are given numbers
  • NOT TO BE CONFUSED WITH the - poles of the
    lead axes

9
(No Transcript)
10
Electrical Axis Calculation
  • Plotting of the net direction or the electrical
    axis
  • QRS axis is most important it is correlates with
    the anatomy of the heart
  • Pathophysiology causes a shift in the axis

11
(No Transcript)
12
Calculate the Axis
  • 1. Calculate the algebraic sum of QRS in Leads I
    III
  • 2. Plot the vector results on a triaxial
    reference system
  • 3. Draw the perpendicular until Lead I III
    cross.
  • 4. Draw a separate line from the center to the
    intersection of the two perpendiculars gives the
    electrical axis.
  • 5. Determine location (normal, RAD or LAD)

13
(No Transcript)
14
Practical Method EA
15
THE ENDOFCHAPTER 12
  • Hauszar Robert, Basic Dysrhythmias,
    Interpretation Management, Third Edition,
    Mosby, Inc. 2002, pp. 171-187.
  • Scheidt, Stephen M.D., Basic Electrocardiography,C
    IBA-GEIGY Pharmaceuticals, 1986
  • pp. 3,18,19
About PowerShow.com