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9 Cards in this Set
- Front
- Back
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What is the QT interval?
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ventricular contraction to ventricular repolarization
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one "small box" on the graph is equiv to
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.04 seconds
40 miliseconds |
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normal ECG PR interval
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one big box!
0.12- 0.20sec(onebigbox) |
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Normal ECG measurements- QRS complex
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.06-.1 second
(three small boxes is too long!) |
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What are normal values for the QT interval?
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normal values depend on heart rate!
for a given beat, QT determined by preceding RR interval As heart rate increases, the QT shortens As heart rate decreases, the QT lengthens! at resting heart rate, QT normally less than 1/2 RR interval |
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What's the normal value for a PR interval?
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.16 seconds
4 boxes! |
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How do you find the end of the T wave in an ECG?
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tangent to the steepest slope of the last limb of the T wave and the baseline
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How would you measure the heart rate on an ECG strip if it is regular?
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Measure R-R interval!
count big boxes (.2 sec) between intervals, divide into 300 |
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How would you measure the heart rate on an ECG if it is irregular?
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Countthenumberofcomplexesin6sec(usingthe3sectimemarkersatthetopofthepage)andmultiplyby10
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