Chapter 48 – ECK paper, Electrodes & Leads, and Standard Leads
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electrocardiograph paper
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is heat sensitive and pressure sensitive
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ECG graph paper
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has horizontal and vertical lines that measure at 1-mm intervals
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time
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the horizontal lines on the paper represent
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amplitude
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the vertical lives on the paper represent
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1-mm on each side
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one small square measures
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5-mm on each side
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every fifth line, both vertical and horizontally, creates a larger square and measures
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0.04 per seconds
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one small 1-mm square passes the stylus every
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0.02 per seconds
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one large 5-mm square passes the stylus every
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25-mm per second
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normal ECG paper travels past the stylus at a rate of
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lead 1
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records tracings between the RA and the LA, recording electrical activity of the lateral part f the left ventricle
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lead2
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records tracings between the RA and the LL, recording electrical activity of the inferior surface of the left ventricle lead to record the rhythm strip
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lead3
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records tracings between the LA and the LL and records the electrical activity of the inferior surface of the left ventricle
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The first three leads are called the
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standard or bipolar leads because they each us tow limb electrodes to record the hearts electrical activity
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electrodes
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small sensors metal plates or disposable unit placed on the skin during an EKG to receive the electrical activity from the heart
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lead wires
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attached to electrodes to record the patients electricity
