Respiratory Therapy CRT Exam
questions and answers.
What is changed when a pat is on PV? -
\Change the set pressure increased or decreased to adjust Vt
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
What is the equation to find desired Vt in VC ventilation? -
\Desired Vt= known Paco2 X Known Vt/desired PaCo2
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.
What do you change if Vt and pressure plateu are already high to improve PaCo2? -
\frequancy
What will need to be changed on a ventilated pat on VC and PV to decrease the
PaCo2? -
\minute volume Ve
What are the causes of respiratory acidosis in a nonventilated patient? -
\pulmonary edema
pneumonia
asthma
chest wall abnormalities
neuromuscular disorders
central nervous system problems
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
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
What change in ventilation is made to ventilator to correct respiratory alkalosis or
acidosis? -
\Vt or rate
, What change is made right away when a patient is on mechanical ventilatio? -
\minute volume Ve
What should a therapist do if the heart rate increased during suctioning? -
\immediately stop suctioning and provide 100% O2
For above the cuff suctioning, what pressure is left on to continuously suction? -
\20mmHg
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
A patient with CHF has what type of secretions? -
\Thin white or pink frothy secreations but won't block the airway
What is the normal ratio of Vd to Vt (Vd/Vt)? -
\0.2 to 0.4
Where does the contraction start of the ventricle? -
\Starts at Q
What is pip? -
\Peak inspiratory pressure, this is the peak at which the flow is given at an inspiration
What is SpO2?` -
\Saturation of O2 on the Hb
What is an HME? -
\artificial nose humidity, filter,warms
What is slope (aka rise)? -
\Inspiratory rise time, it slows or speeds the rate at which pressure and flow exit the
ventilator for a specific period of time
What is trigger? -
\The sensativity set too low can also cause auto peep
What is FIO2? -
\% of O2 to improve Oxygenation. A way to measure O2 to the tissues. Check ABG's to
keep PaO2 ath 60-90mmHg below 0.4 to 0.5
What is minimal occluding volume? -
\volume of air measured to seal the cuff at 1 to 2%
questions and answers.
What is changed when a pat is on PV? -
\Change the set pressure increased or decreased to adjust Vt
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
What is the equation to find desired Vt in VC ventilation? -
\Desired Vt= known Paco2 X Known Vt/desired PaCo2
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.
What do you change if Vt and pressure plateu are already high to improve PaCo2? -
\frequancy
What will need to be changed on a ventilated pat on VC and PV to decrease the
PaCo2? -
\minute volume Ve
What are the causes of respiratory acidosis in a nonventilated patient? -
\pulmonary edema
pneumonia
asthma
chest wall abnormalities
neuromuscular disorders
central nervous system problems
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
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
What change in ventilation is made to ventilator to correct respiratory alkalosis or
acidosis? -
\Vt or rate
, What change is made right away when a patient is on mechanical ventilatio? -
\minute volume Ve
What should a therapist do if the heart rate increased during suctioning? -
\immediately stop suctioning and provide 100% O2
For above the cuff suctioning, what pressure is left on to continuously suction? -
\20mmHg
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
A patient with CHF has what type of secretions? -
\Thin white or pink frothy secreations but won't block the airway
What is the normal ratio of Vd to Vt (Vd/Vt)? -
\0.2 to 0.4
Where does the contraction start of the ventricle? -
\Starts at Q
What is pip? -
\Peak inspiratory pressure, this is the peak at which the flow is given at an inspiration
What is SpO2?` -
\Saturation of O2 on the Hb
What is an HME? -
\artificial nose humidity, filter,warms
What is slope (aka rise)? -
\Inspiratory rise time, it slows or speeds the rate at which pressure and flow exit the
ventilator for a specific period of time
What is trigger? -
\The sensativity set too low can also cause auto peep
What is FIO2? -
\% of O2 to improve Oxygenation. A way to measure O2 to the tissues. Check ABG's to
keep PaO2 ath 60-90mmHg below 0.4 to 0.5
What is minimal occluding volume? -
\volume of air measured to seal the cuff at 1 to 2%
