This document is a presentation about ECG rhythm interpretation. It consists of slides that cover ECG basics, normal impulse conduction through the heart, the components of the ECG waveform, heart pacemakers, how to read the ECG paper, and concludes the first module on ECG basics. The presentation encourages visiting the given website for more free medical presentations.

1. • FOR MORE FREE MEDICAL POWERPOINT
PRESENTATIONS VISIT WEBSITE
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blogspot.com
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2. ECG Rhythm Interpretation
Module I
ECG Basics
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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.
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4. Learning Modules
• ECG Basics
• How to Analyze a Rhythm
• Normal Sinus Rhythm
• Heart Arrhythmias
• Diagnosing a Myocardial Infarction
• Advanced 12-Lead Interpretation
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5. Normal Impulse Conduction
Sinoatrial node
AV node
Bundle of His
Bundle Branches
Purkinje fibers
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6. Impulse Conduction & the ECG
Sinoatrial node
AV node
Bundle of His
Bundle Branches
Purkinje fibers
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7. The “PQRST”
• P wave - Atrial
depolarization
• QRS - Ventricular
depolarization
• T wave - Ventricular
repolarization
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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) For more presentations www

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.
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10. The ECG Paper
• Horizontally
– One small box - 0.04 s
– One large box - 0.20 s
• Vertically
– One large box - 0.5 mV
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11. The ECG Paper (cont)
3 sec 3 sec
• 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.
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12. End of Module I
ECG Basics
Proceed to Module I Practice Quiz
on WebCT
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13. • FOR MORE FREE MEDICAL POWERPOINT
PRESENTATIONS VISIT WEBSITE
•www.medicalppt.
blogspot.com
For more presentations www