Respiratory Therapy CRT Exam Questions

Respiratory Therapy CRT Exam Questions 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?