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Basic Math Operations

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Precision
the degree to which a measurement can be reproduced
Accuracy
the extent to which a measurement agrees with a standard
3 Types of Errors
...
Random
unavoidable error but can be minimized
Systematic
due to a faulty measuring device or a procedural flaw
Parallax
shift in position of an object due to the viewing angle
most common error made
I-Time
time spent inhaling
E-Time
time spent exhaling
I:E Ratio
inspiratory/expiratory ratio
Total Cycle Time
sum of both the I-time and the E-time
I-time/I-time: E-time/I-time
formula for I:E Ratio
Normal I:E Ratio
1:2 or 1:3
COPD I:E Ratio
1:4 or 1:5
Infant I:E Ratio
1:1 or 1:1.5
Normal Breathing Rate
12-20 b/m
Ventilator Breathing Rate
8-12 b/m
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
I-time/E-time: E-time/E-time
inverse I:E ratio formula
E-time= 60/RR-I-time
calculating I:E ratio when the respiratory rate and either I-time or E-time is given
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