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Respiratory Therapy – Formulas Practice Test

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Te is calculated as Te = TCT - Ti. Which option correctly expresses this relationship?
Correct Answer:
Te = TCT - Ti
Explanation:
The idea being tested is how expiratory time relates to the total cycle time and the inspiratory time. The total cycle time (TCT) is made up of two phases: inspiration (Ti) and expiration (Te). Therefore Te is what’s left after you subtract Ti from TCT, so Te = TCT − Ti. This captures the fact that the breathing cycle is partitioned into a inhalation portion and an exhalation portion that together fill the entire cycle. If you tried other forms, they wouldn’t match how the cycle is composed: Te would not equal Ti, division of TCT by Ti changes the meaning and units, and adding Ti to TCT would exceed the total cycle time. The correct expression is Te = TCT − Ti.

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