axis deviation n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Axis Deviation PowerPoint Presentation
Download Presentation
Axis Deviation

Loading in 2 Seconds...

play fullscreen
1 / 25

Axis Deviation - PowerPoint PPT Presentation


  • 356 Views
  • Uploaded on

Axis Deviation. Chapter 5. Definition. Electrical axis... The general direction in the frontal plane or toward which lead the QRS complex is predominately oriented ...the mean direction of depolarization through the frontal plane of the heart. Mean QRS Axis Calculation. Lead II.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Axis Deviation' - paiva


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
definition
Definition
  • Electrical axis...
    • The general direction in the frontal plane or toward which lead the QRS complex is predominately oriented
    • ...the mean direction of depolarization through the frontal plane of the heart
mean qrs axis calculation1
Mean QRS Axis Calculation
  • General rules
    • the mean QRS axis points midway between any two leads that show tall R waves of equal height
    • the mean QRS axis is oriented at right angles (90°) to any lead showing a bi-phasic complex
normal versus deviation
Normal versus Deviation

Left

3 ?

1 ?

2 ?

Right

+ 90∘

axis deviation2
Axis Deviation
  • RAD = If R wave in III > R wave in II
  • LAD = If R wave in aVL > I; and deep S wave in III
causes of left axis deviation
Causes of Left Axis Deviation

FYI

• left anterior hemiblock

• Q waves of inferior myocardial infarction

• artificial cardiac pacing

• emphysema

• hyperkalaemia

• Wolff-Parkinson-White syndrome - right sided accessory pathway

• tricuspid atresia

• ostium primum ASD

• injection of contrast into left coronary artery

note: left ventricular hypertrophy is not a cause left axis deviation

causes of right axis deviation
Causes of Right Axis Deviation

FYI

• normal finding in children and tall thin adults

• right ventricular hypertrophy

• chronic lung disease even without pulmonary hypertension

• anterolateral myocardial infarction

• left posterior hemiblock

• pulmonary embolus

• Wolff-Parkinson-White syndrome - left sided accessory pathway

• atrial septal defect

• ventricular septal defect