NURS MISC Critical Care Test 1 - Respiratory Testbank Top Predicted Questions and Correct Answers 2024

What percentage of room air is made up of oxygen? - 21% What is hypoxemia? - decreased (arterial) oxygen content in the blood. (Measured by ABG) What is hypoxia? - decreased oxygen supply to the tissues. (Measured by pulse oximetry) Low-flow oxygenation systems - are less precise than high-flow oxygenation systems these systems are affected by the pts. rate and depth of respirations these systems DO NOT PROVIDE A CONSTANT FIO2 (FIO2= the % of O2 concentration ex: nasal cannula, simple face mask, partial non-rebreather, & non-rebreather masks High-flow oxygenation systems - these systems deliver a SPECIFIC (PRECISE) & CONSTANT % OF O2 without dependence on the client's breathing. these O2 delivery methods are more PRECISE than the low-flow systems ex: venture mask, trach collar, T-piece How many liters (L) of oxygen can a nasal cannula deliver? - 1-6L of O2; can be turned up to 10L, but will not deliver over the % of o2 that is specific to nasal cannulas What O2 concentration (FIO2) can a nasal cannula deliver? - between 24-44% What level of oxygenation requires humidification? - any level 4L or greater, can also be used on flows less than 4 if oxygen is becoming drying and irritating to the pt. What type of oxygenation system are nasal cannulas considered? - low-flow oxygenation systems because the amount of room air that the pt. takes in mixes with the given O2 and dilutes it; also, because the amount of O2 taken in by the pt. varies based on the pts. rate and depth respirations (pt. will receive somewhere b/w 24-44% of O2 while on nasal cannula oxygenation) How many liters of O2 can a simple face mask deliver? - 6-8L What concentration of oxygen (FIO2) can be achieved through a simple face mask? - 35- 50% Why is a simple face mask considered a LOW-FLOW system? - because of the design of the mask; the patient can still take in atmospheric air through the holes on the sides of the mask Cons of the simple face mask - can be a problem to claustrophobic patients, they may feel trapped behind the mask the mask has to be removed to eat the mask can cause skin breakdown over the ears and around the face How many liters of oxygen can a PARTIAL NON-REBREATHER MASK deliver? - 8- 10L @ What concentration can a partial non-rebreather mask deliver oxygen (FIO2)? - 50- 75% Why is the PARTIAL NON-REBREATHER (PARTIAL REBREATHER) MASK considered a LOW-FLOW system? - because the partial rebreather mask is designed like a simple face mask causing the pt. to still breath in atmospheric air. The only difference is the attached reservoir bag. Make sure that the reservoir bag REMAINS INFLATED @ ALL TIMES Mask is poorly fitting, and has to be removed to eat How many liters of oxygen can the non-rebreather deliver? - 10-15L