Module_7b 8.32.16 PM

Module_7b 8.32.16 PM - ECG Rhythm Interpretation Module VII...

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For more presentations www.medicalppt.blo ECG Rhythm Interpretation Module VII b Reading 12-Lead ECG’s
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For more presentations www FOR MORE FREE MEDICAL POWERPOINT PRESENTATIONS VISIT WEBSITE www.medicalppt. blogspot.com
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For more presentations www Course Objective To systematically analyze a 12-lead ECG.
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For more presentations www Learning Modules ECG Basics How to Analyze a Rhythm Normal Sinus Rhythm Heart Arrhythmias Diagnosing a Myocardial Infarction Advanced 12-Lead Interpretation Reading 12-Lead ECG’s
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For more presentations www Reading 12-Lead ECGs In Module VII a we introduced a 6 step approach for analyzing a 12-lead ECG and covered the first 3 steps. In this module we will cover the last 3 steps. 1. Calculate RATE 2. Determine RHYTHM 3. Determine QRS AXIS 4. Calculate INTERVALS 5. Assess for HYPERTROPHY 6. Look for evidence of INFARCTION
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For more presentations www Rate Rhythm Axis Intervals Hypertrophy Infarct Intervals refers to the length of the PR and QT intervals and the width of the QRS complexes. You should have already determined the PR and QRS during the “rhythm” step, but if not, do so in this step. In the following few slides we’ll review what is a normal and abnormal PR, QRS and QT interval. Also listed are a few common causes of abnormal intervals.
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For more presentations www Rate Rhythm Axis Intervals Hypertrophy Infarct PR interval < 0.12 s 0.12-0.20 s > 0.20 s High catecholamine states Wolff-Parkinson-White Normal AV nodal blocks Wolff-Parkinson-White 1st Degree AV Block
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For more presentations www Rate Rhythm Axis Intervals Hypertrophy Infarct QRS complex < 0.10 s 0.10-0.12 s > 0.12 s Normal Incomplete bundle branch block Bundle branch block PVC Ventricular rhythm Remember: If you have a BBB determine if it is a right or left BBB. If you need a refresher see Module VI . 3 rd degree AV block with ventricular escape rhythm Incomplete bundle branch block
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For more presentations www Rate Rhythm Axis Intervals Hypertrophy Infarct QT interval The duration of the QT interval is proportionate to the heart rate. The faster the heart beats, the faster the ventricles repolarize so the shorter the QT interval. Therefore what is a “normal” QT varies with the heart rate. For each heart rate you need to calculate an adjusted QT interval, called the “corrected QT” (QTc): QTc = QT / square root of RR interval
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Rate Rhythm Axis Intervals Hypertrophy Infarct QTc interval < 0.44 s > 0.44 s Normal Long QT A prolonged QT can be very dangerous. It may predispose an individual to a type of ventricular tachycardia called Torsades de Pointes. Causes include drugs, electrolyte abnormalities, CNS disease, post-MI, and congenital heart disease. Torsades de Pointes
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This note was uploaded on 12/21/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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Module_7b 8.32.16 PM - ECG Rhythm Interpretation Module VII...

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