IT ET TCT - MCC RSPT
MODULE D - VENTILATOR CALCULATIONS CALCULATING TOTAL CYCLE TIME, TI, TE, I:E RATIOS, and f
1. Given an inspiratory time of 1.2 seconds and an expiratory time of 3 seconds, calculate the I:E ratio and the respiratory rate.
IT ET TCT 1.2 3 4.2 sec f 60 60 14.3 ~ 14 breaths/min
TCT 4.2 I : E 1.2 : 3 1.2 1 1.2 3, 2.5,1: 2.5
3
2. Given an inspiratory time of 0.8 seconds and an expiratory time of 1.5 seconds, calculate the I:E ratio and the respiratory rate.
IT ET TCT 0.8 1.5 2.3 sec f 60 60 26.1 ~ 26 breaths/min
TCT 2.3 I : E 0.8 : 1.5 0.8 1 0.8 1.5, 1.9,1: 1.9
1.5
3. Given an inspiratory time of 1.0 seconds and an expiratory time of 1.75 seconds, calculate the I:E ratio and the respiratory rate.
IT ET TCT 1.0 1.75 2.75 sec f 60 60 21.8 ~ 22 breaths/min
TCT 2.75 I : E 1.0 : 1.75 1.0 1 1 1.75, 1.75,1: 1.75
1.75
4. Given a f of 40/minute and a I:E ratio of 1:2, calculate the inspiratory and expiratory times.
TCT 60 60 1.5 sec f 40
IT TCT 1.5 sec 1.5 0.5 sec I E 1 2 3
ET TCT - IT 1.5 sec - 0.5 sec 1.0
5. A newborn is being ventilated on a time-cycled, pressure limited ventilator. The ventilatory parameters are as follows:
Rate: 40/minute PEEP: 5 cm H2O
Peak Pressure: 32 cm H2O Inspiratory Time: 0.4 seconds
What is the I:E ratio?
TCT 60 60 1.5 sec f 40
ET TCT - IT 1.5 sec - 0.4 sec 1.1sec
I : E 0.4 : 1.1 0.4 1 0.4 1.1, 2.75,1: 2.75 1.1
6. The RCP receives an order to initiate mechanical ventilation at a rate of 45
breaths/minute and an I:E ratio of 1:2. Which of the following inspiratory times would
achieve the specified ratio?
a. 0.54 b. 0.48 c. 0.44 d. 0.40 e. 0.20
TCT 60 60 1.3 sec f 45
IT TCT 1.3 sec 1.3 0.4 sec I E 1 2 3
7. The doctor orders a f of 50/minute and an I:E ratio of 1:1.5. Calculate the TI and TE.
TCT 60 60 1.2 sec f 50
IT TCT 1.2 sec 1.2 0.48 sec I E 1 1.5 2.5
ET TCT - IT 1.2 - 0.48 .72 sec
8. The doctor orders a f of 60/minute and an I:E ratio of 1:1. Calculate the TI and TE.
9. The doctor orders a f of 30/minute and an I:E ratio of 1:3. Calculate the TI and TE.
TCT 60 60 1.0 sec f 60
IT TCT 1sec 1 0.5 sec I E 11 2
ET TCT - IT 1- 0.5 .5 sec
TCT 60 60 2.0 sec f 30
IT TCT 2 sec 2 0.5 sec I E 1 3 4
ET TCT - IT 2 - 0.5 1.5 sec
10. The doctor orders a f of 35/minute and an inspiratory time of 0.75 seconds. What is the I:E ratio?
TCT 60 60 1.7 sec f 35
ET TCT - IT 1.7 sec - 0.75 sec 0.95 sec I : E 0.75 : 0.95 0.75 1 0.75 0.95, 1.27,1: 1.27
0.95
11. The doctor orders a f of 40/minute and an inspiratory time of 0.6 seconds. What is the I:E
ratio?
TCT 60 60 1.5 sec f 40
ET TCT - IT 1.5 sec - 0.6 sec 0.9 sec
I : E 0.6 : 0.9 0.6 1 0.6 0.9, 1.5,1: 1.5 0.9
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