Te is calculated as Te = TCT - Ti. Which option correctly expresses this relationship?

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Multiple Choice

Te is calculated as Te = TCT - Ti. Which option correctly expresses this relationship?

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.

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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