1 / 36

Understanding EKGs

Understanding EKGs. Vectors. A vector has direction A vector has magnitude Vectors can be added or summated. Vector A. Vector B. Resultant Vector. A + B. EKG 2. EKG 3. Normal Waves of the EKG. P wave – atrial depolarization T a wave – atrial repolarization

galvin
Download Presentation

Understanding EKGs

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Understanding EKGs

  2. Vectors • A vector has direction • A vector has magnitude • Vectors can be added or summated

  3. Vector A Vector B Resultant Vector A + B

  4. EKG 2

  5. EKG 3

  6. Normal Waves of the EKG • P wave – atrial depolarization • Ta wave – atrial repolarization • Q wave – initial negative deflection from ventricular depolarization • R wave – first positive deflection from ventricular depolarization • S wave – first negative deflection following the R

  7. Normal Waves Con’td • R’ wave – second positive deflection • S’ wave – second negative deflection following R • T wave – ventricular repolarization

  8. P Wave Characteristics • Duration is < 0.12 seconds • Amplitude is < 4 mm • Contour is normally gently rounded, not notched or peaked • Normally upright in I, II, aVF • Inverted in aVR

  9. QRS Characteristics • Normal duration is < 0.11 seconds • Amplitude (R or S wave) is > 5 mm and < 30 mm • Dominantly positive in I, II, aVF • Dominantly negative in aVR

  10. T Wave Characteristics • Same polarity as dominant wave of QRS • Positive in I, II, aVF • Inverted in aVR • Asymmetrical, ascending more slowly than descending

  11. Segments and Intervals of the EKG • P-R Interval • From beginning of P to beginning of QRS • Measures time taken by impulse to travel from SA node to ventricular fibers • Normal duration 0.12-0.20 seconds • ST Segment • From end of QRS to beginning of T • Should be isoelectric (on baseline)

More Related