basic ekg interpretation l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Basic EKG Interpretation PowerPoint Presentation
Download Presentation
Basic EKG Interpretation

Loading in 2 Seconds...

play fullscreen
1 / 14

Basic EKG Interpretation - PowerPoint PPT Presentation


  • 313 Views
  • Uploaded on

Basic EKG Interpretation. History. Mid 1880’s - Ludwig & Waller discovered that the heart’s rhythm could be monitored from a person’s skin 1901 - Dr. William Einthoven invented the EKG machine EKG - Electrocardiogram - Electrical activity of the heart (contraction of the myocardium).

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 'Basic EKG Interpretation' - adamdaniel


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
history
History
  • Mid 1880’s - Ludwig & Waller discovered that the heart’s rhythm could be monitored from a person’s skin
  • 1901 - Dr. William Einthoven invented the EKG machine
  • EKG - Electrocardiogram - Electrical activity of the heart (contraction of the myocardium)
electrical conduction
Electrical Conduction
  • Heart muscle cells - “myocytes”
  • “Depolarization” moves as a wave through the myocardium
  • “Depolarization” stimulates the heart’s myocytes, they become + and contract
  • Cell-to-cell depolarization through the myocardium is carried with Na+ ions
slide4
EKG
  • Myocardial contraction is caused by depolarization. The recovery phase that follows depolarization is known as repolarization.
  • The SA Node (“Sinus Node) is the heart’s dominant pacemaker. - Sinus Rhythm
  • Each depolarization wave emitted through the SA Node spreads through the atria producing a P Wave.
slide5
P Wave = Atrial Depolarization
  • AV Node - Conducting pathway b/t the atria and the ventricles
  • When a wave of atrial depolarization enters the AV Node, depolarization slows, producing a brief pause, thus allowing blood to enter the ventricles. Ca++ ions
ventricular conduction
Ventricular Conduction
  • Depolarization shoots rapidly through the HIS Bundle, and the Left & Right Bundle Branches
  • The HIS Bundle and both Bundle Branches are made up of rapidly conducting Purkinje fibers.
  • Depolarization of the entire ventricular myocardium produces a QRS complex.
  • QRS represents ventricular contraction.
ventricular conduction7
Ventricular Conduction
  • The Q Wave, when present, always occurs at the beginning of the QRS complex and is the first downward deflection.
  • The next upward deflection represents the RWave.
  • The next downward wave is the S Wave.
  • The horizontal segment of baseline that follows the QRS is known as the ST Segment.
continued
Continued.
  • If the ST Segment is elevated or depressed beyond baseline level, this is usually a sign of problems.
  • The ST Segment represents the initial phase of Ventricular Repolarization.
  • The T Wave represents the final, “rapid” phase of ventricular repolarization.
  • The T Wave is usually a low, broad hump.
slide9
Repolarization is accomplished by K+ ions leaving the myocites.
  • Ventricular systole (contraction) begins with the QRS and persists until the end of the T Wave.
  • Physiologically, a cardiac cycle represents atrial contraction, and ventricular contraction followed by a resting stage. Page 29
recording the ekg
Recording the EKG
  • Page 31
  • Smallest divisions are 1 mm high X 1 mm wide.
  • 5 small squares make up one large square
  • The height or depth of waves is voltage.
  • The upward or downward deflection is called amplitude.
ekg recordings
EKG Recordings
  • The amount of time represented by the distance b/t two heavy lines is .2 of a second.
  • Each small division represents .04 seconds.
  • A standard EKG has 6 limb leads and six chest leads.
  • Bipolar limb leads - Page 38.
limb leads
Limb Leads
  • AVR, AVL, & AVF are unipolar limb leads.
  • Page 42.
  • Page 43.
  • Page 44.
  • 6 Chest Leads
  • V1 - V6
slide13
Rate
  • R to R intervals
  • 300, 150, 100, 75, 60, 50
  • 6 second strip
  • Count cycles and add a zero to the end