Respiratory Therapy CRT Exam Questions | NBRC TMC Practice
Questions with Verified Answers – 2024–2025
This document offers a targeted set of practice questions with verified answers for
the Certified Respiratory Therapist (CRT) exam via the NBRC TMC pathway.
Questions cover high-priority topics such as respiratory assessment, airway care,
oxygen delivery, mechanical ventilation, pharmacologic agents, and emergency
protocols. Ideal for respiratory therapy students preparing for national certification
in 2024–2025.
1. What is changed when a pat is on PV?: Change the set pressure increased
or decreased to adjust Vt
2. What equation is used to reduce PaCo2 on a pat vented with VC
ventilation when the rate is needing to be changed due to volume being
high enough?: -Desired F= known F X PaCo2/desired PaCo2
3. What is the equation to find desired Vt in VC ventilation?: Desired Vt=
known Paco2 X Known Vt/desired PaCo2
4. What is increased to increase Vt with a PVC time cycled ventilation?:
With pressure control ventilation PCV the set pressure is generally increased
to obtain the targeted Vt. PCV is Time cycled If It is short increasing it will
increase volume delivery without increasing pressure.
5. What do you change if Vt and pressure plateu are already high to
improve PaCo2?: frequancy
1/5
, 6. What will need to be changed on a ventilated pat on VC and PV to
decrease the PaCo2?: minute volume Ve
7. What are the causes of respiratory acidosis in a nonventilated
patient?:pulmonary edema pneumonia
asthma
chest wall abnormalities
neuromuscular disorders central
nervous system problems
8. What two values are effected if patient has respiratory acidosis and Va is
not adequante on volume ventilation and pressure ventilation?: PaCo2
elevated above >45mmhg and pH decreased <7.35
9. What two things can be adusted when a patient is on PCV with
respiratory acidosis?: Inspiratory time set pressure reaches alveolar level if
this doesnt work set pressure increased to improve volume
10. What change in ventilation is made to ventilator to correct respiratory
alkalosis or acidosis?: Vt or rate
11. What change is made right away when a patient is on mechanical
ventilatio?: minute volume Ve
12. What should a therapist do if the heart rate increased during
suctioning?-: immediately stop suctioning and provide 100% O2
13. For above the cuff suctioning, what pressure is left on to continuously
suction?: 20mmHg
14. What is the correct size of catheter used to suction?: 1/2 the size of the
ET tube. equation for a size 8 ET tube 3x8=24 24/2=12Fr Size 12Fr is used
2/5
Questions with Verified Answers – 2024–2025
This document offers a targeted set of practice questions with verified answers for
the Certified Respiratory Therapist (CRT) exam via the NBRC TMC pathway.
Questions cover high-priority topics such as respiratory assessment, airway care,
oxygen delivery, mechanical ventilation, pharmacologic agents, and emergency
protocols. Ideal for respiratory therapy students preparing for national certification
in 2024–2025.
1. What is changed when a pat is on PV?: Change the set pressure increased
or decreased to adjust Vt
2. What equation is used to reduce PaCo2 on a pat vented with VC
ventilation when the rate is needing to be changed due to volume being
high enough?: -Desired F= known F X PaCo2/desired PaCo2
3. What is the equation to find desired Vt in VC ventilation?: Desired Vt=
known Paco2 X Known Vt/desired PaCo2
4. What is increased to increase Vt with a PVC time cycled ventilation?:
With pressure control ventilation PCV the set pressure is generally increased
to obtain the targeted Vt. PCV is Time cycled If It is short increasing it will
increase volume delivery without increasing pressure.
5. What do you change if Vt and pressure plateu are already high to
improve PaCo2?: frequancy
1/5
, 6. What will need to be changed on a ventilated pat on VC and PV to
decrease the PaCo2?: minute volume Ve
7. What are the causes of respiratory acidosis in a nonventilated
patient?:pulmonary edema pneumonia
asthma
chest wall abnormalities
neuromuscular disorders central
nervous system problems
8. What two values are effected if patient has respiratory acidosis and Va is
not adequante on volume ventilation and pressure ventilation?: PaCo2
elevated above >45mmhg and pH decreased <7.35
9. What two things can be adusted when a patient is on PCV with
respiratory acidosis?: Inspiratory time set pressure reaches alveolar level if
this doesnt work set pressure increased to improve volume
10. What change in ventilation is made to ventilator to correct respiratory
alkalosis or acidosis?: Vt or rate
11. What change is made right away when a patient is on mechanical
ventilatio?: minute volume Ve
12. What should a therapist do if the heart rate increased during
suctioning?-: immediately stop suctioning and provide 100% O2
13. For above the cuff suctioning, what pressure is left on to continuously
suction?: 20mmHg
14. What is the correct size of catheter used to suction?: 1/2 the size of the
ET tube. equation for a size 8 ET tube 3x8=24 24/2=12Fr Size 12Fr is used
2/5
