1 / 10

ECG Basics

ECG Basics. Anatomy of the Heart. Sinus Node (SA node) – the primary pacemaker of the heart; Atrioventricular Node (AV node) – slows and transmits electrical signal from atria to ventricles. Bundle of His – rapidly sends electrical signal through ventricles

cuthbert
Download Presentation

ECG Basics

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. ECG Basics

  2. Anatomy of the Heart Sinus Node (SA node) – the primary pacemaker of the heart; Atrioventricular Node (AV node) – slows and transmits electrical signal from atria to ventricles. Bundle of His – rapidly sends electrical signal through ventricles Right and Left Bundle branches – carry fast electrical signals through the ventricles Bundle Branches (bundles of Purkinje fibers)

  3. Where is the Rate Determined? SAnode – pacemaker of the heart; rate of 60- 100 bpm if SA node fails, then the Atrial foci will pace the heart; rate of 60-80 bpm If the Atrial foci fail, then the AV node (Junctional foci) will pace the heart, send electrical activity up through the atria and down through the ventricles; rate of 40-60 bpm If the Junctional foci fail, then the Purkinje fibers (ventricular foci) will pace; rate of 20-40 bpm

  4. Breaking Down an EKG – What It All Means

  5. P wave – Atrial Depolarization (atrial contraction) < 0.11 seconds PR interval – Time from atria to Purkinje fibers 0.12 - 0.20 seconds QRS complex – Ventricular Depolarization (ventricular contraction) First negative deflection – Q wave First Positive deflection – R wave Negative following the R wave – S wave 0.05 – 0.10 seconds ST segment – Ventricle remains depolarized 0.04 seconds T wave – rapid ventricular repolarization QT interval – repolarization Ventricular contraction last from Q wave to end of T wave < 0.42 seconds U wave – Purkinje fibers repolarization -usually present with post-MI patients R-R interval – duration of one heart beat

  6. What else to consider? • What is the heart rate? • Atrial HR – number of P waves • Ventricular HR – number of QRS complexes • Normally – should be equal • Is the rhythm regular or irregular? • Are the R-R interval equally spaced? • Is there a P wave for every QRS? • Yes – sinus rhythm • No – more information needed

  7. It’s all about the paper • Each small square is 1 mm tall by 1 mm wide • Time x amplitude • Between two thick black lines is 0.20 seconds, therefore 5 thick line boxes equal 1 minute. • Can use a 6 second strip to calculate rate and rhythm.

  8. Let’s Practice! • P wave = ________ • PR interval = ________ • QRS interval = _________ • ST segment = ________ • T wave = ________ P wave = 0.10 * PR interval = 0.16 * QRS interval = 0.04 * ST segment = 0.14 * T wave = 0.18

  9. More Practice! • What is the heart rate? • Is this rhythm regular or irregular? • Is there a P wave for every QRS complex? • Is this a sinus rhythm? What is the heart rate? 60 bpm * Is this rhythm regular or irregular? Regular * Is there a P wave for every QRS complex? Yes * Is this a sinus rhythm? Yes

  10. Strip of the Month

More Related