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1 A Cardiac Rhythym Strip Analysis

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Question
Answer
EKG paper each small block =____   0.04 seconds (1 small block)  
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EKG paper 5 small blocks =____   0.20 seconds (1 large block)  
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P wave represents   atrial depolarization or atrial contraction  
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Abnormal P waves would be seen with which dysrhythmias?   PAC’s, sinus block/arrest, Aflutter, AFib  
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Causes of Abnormal P waves?   Atrial hypertrophy, hyperkalemia, PAC’s  
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PR interval represents?   conduction through the AV node, slowed conduction allowing time for the ventricles to fill  
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Length of normal PR interval?   0.12-0.20secs (3-5 small boxes)  
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PR interval is Measured from   beginning of P wave to beginning of QRS complex  
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Abnormally long PRI >0.20 would be seen with which dysrhythmia?   First degree heart block  
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QRS represents   ventricular depolarization or ventricular contraction  
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Length of normal QRS?   0.06-0.10seconds or <0.12secs (< 3 small boxes)  
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Abnormally long QRS >0.12secs would be seen with?   Interventricular conduction delays, Left Bundle Branch Block(LBBB)  
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T wave represents?   ventricular repolarization  
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Cause of Abnormal Tall Peaked T waves is?   Hyperkalemia  
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Tall peaked T waves would be seen with?   MI, BBB  
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ST elevation or depression is this normal or abnormal?   abnormal  
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ST elevation or depression is seen with?   Ischemia or Injury (MI)  
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QT interval represents?   total depolarization and repolarization of the ventricles  
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Length of normal QT interval?   <0.40secs  
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Abnormally long QT interval >0.40 is caused by?   Hypocalcemia, hypothyroid, Amiodorone(Meds), MI  
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Abnormally long QT interval would be seen with?   Life threatening dysrhythmias, MI  
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What is the Easy method for determining the heart rate from the EKG strip?   number of R waves in 6sec strip X 10  
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What is the most accurate method for determining the heart rate from the EKG strip?   1500 divided by number of small blocks between R waves  
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