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ECG Rhythm Interpretation
Module I
ECG Basics
www.indiandentalacademy.com
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com
www.indiandentalacademy.com
Course Objectives
• To recognize the normal rhythm of the
heart - “Normal Sinus Rhythm.”
• To recognize the 13 most common
rhythm disturbances.
• To recognize an acute myocardial
infarction on a 12-lead ECG.
www.indiandentalacademy.com
Learning Modules
• ECG Basics
• How to Analyze a Rhythm
• Normal Sinus Rhythm
• Heart Arrhythmias
• Diagnosing a Myocardial Infarction
• Advanced 12-Lead Interpretation
www.indiandentalacademy.com
Normal Impulse Conduction
Sinoatrial node
AV node
Bundle of His
Bundle Branches
Purkinje fibers
www.indiandentalacademy.com
Impulse Conduction & the ECG
Sinoatrial node
AV node
Bundle of His
Bundle Branches
Purkinje fibers
www.indiandentalacademy.com
The “PQRST”
• P wave - Atrial
depolarization
• T wave - Ventricular
repolarization
• QRS - Ventricular
depolarization
www.indiandentalacademy.com
The PR Interval
Atrial depolarization
+
delay in AV junction
(AV node/Bundle of His)
(delay allows time for
the atria to contract
before the ventricles
contract) www.indiandentalacademy.com
Pacemakers of the Heart
• SA Node - Dominant pacemaker with an
intrinsic rate of 60 - 100 beats/minute.
• AV Node - Back-up pacemaker with an
intrinsic rate of 40 - 60 beats/minute.
• Ventricular cells - Back-up pacemaker
with an intrinsic rate of 20 - 45 bpm.
www.indiandentalacademy.com
The ECG Paper
• Horizontally
– One small box - 0.04 s
– One large box - 0.20 s
• Vertically
– One large box - 0.5 mV
www.indiandentalacademy.com
The ECG Paper (cont)
• Every 3 seconds (15 large boxes) is
marked by a vertical line.
• This helps when calculating the heart
rate.
NOTE: the following strips are not marked
but all are 6 seconds long.
3 sec 3 sec
www.indiandentalacademy.com
End of Module I
ECG Basics
Proceed to Module I Practice Quiz
on WebCT
www.indiandentalacademy.com
Thank you
For more details please visit
www.indiandentalacademy.com
www.indiandentalacademy.com

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Module 1

  • 1. ECG Rhythm Interpretation Module I ECG Basics www.indiandentalacademy.com INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com
  • 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 3. Course Objectives • To recognize the normal rhythm of the heart - “Normal Sinus Rhythm.” • To recognize the 13 most common rhythm disturbances. • To recognize an acute myocardial infarction on a 12-lead ECG. www.indiandentalacademy.com
  • 4. Learning Modules • ECG Basics • How to Analyze a Rhythm • Normal Sinus Rhythm • Heart Arrhythmias • Diagnosing a Myocardial Infarction • Advanced 12-Lead Interpretation www.indiandentalacademy.com
  • 5. Normal Impulse Conduction Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers www.indiandentalacademy.com
  • 6. Impulse Conduction & the ECG Sinoatrial node AV node Bundle of His Bundle Branches Purkinje fibers www.indiandentalacademy.com
  • 7. The “PQRST” • P wave - Atrial depolarization • T wave - Ventricular repolarization • QRS - Ventricular depolarization www.indiandentalacademy.com
  • 8. The PR Interval Atrial depolarization + delay in AV junction (AV node/Bundle of His) (delay allows time for the atria to contract before the ventricles contract) www.indiandentalacademy.com
  • 9. Pacemakers of the Heart • SA Node - Dominant pacemaker with an intrinsic rate of 60 - 100 beats/minute. • AV Node - Back-up pacemaker with an intrinsic rate of 40 - 60 beats/minute. • Ventricular cells - Back-up pacemaker with an intrinsic rate of 20 - 45 bpm. www.indiandentalacademy.com
  • 10. The ECG Paper • Horizontally – One small box - 0.04 s – One large box - 0.20 s • Vertically – One large box - 0.5 mV www.indiandentalacademy.com
  • 11. The ECG Paper (cont) • Every 3 seconds (15 large boxes) is marked by a vertical line. • This helps when calculating the heart rate. NOTE: the following strips are not marked but all are 6 seconds long. 3 sec 3 sec www.indiandentalacademy.com
  • 12. End of Module I ECG Basics Proceed to Module I Practice Quiz on WebCT www.indiandentalacademy.com
  • 13. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com