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Precision

the degree to which a measurement can be reproduced

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Accuracy

the extent to which a measurement agrees with a standard

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Random

unavoidable error but can be minimized

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Systematic

due to a faulty measuring device or a procedural flaw

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Parallax

shift in position of an object due to the viewing angle

**most common error made**

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I-Time

time spent inhaling

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E-Time

time spent exhaling

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I:E Ratio

inspiratory/expiratory ratio

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Total Cycle Time

sum of both the I-time and the E-time

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I-time/I-time: E-time/I-time

formula for I:E Ratio

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Normal I:E Ratio

1:2 or 1:3

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COPD I:E Ratio

1:4 or 1:5

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Infant I:E Ratio

1:1 or 1:1.5

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Normal Breathing Rate

12-20 b/m

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Ventilator Breathing Rate

8-12 b/m

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Inverse I:E Ratio

when E-time exceeds I-time

**only used on patients who have ARDS and the patient must be very heavily sedated**

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I-time/E-time: E-time/E-time

inverse I:E ratio formula

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E-time= 60/RR-I-time

calculating I:E ratio when the respiratory rate and either I-time or E-time is given

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1) TCT= 60/RR; 2) I-time= TCT/sum of I:E ratio; 3) E-time= TCT- I-time

calculating the I-time and E-time when TCT and I:E ratio are given

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