- A patient with sleep apnea is being set up with oxygen therapy via nasal cannula at 3 L/min for overnight use. The CPCT/A notices the patient breathes primarily through their mouth when sleeping. The night nurse mentions the patient's SpO2 drops to 86% during sleep despite the oxygen. What equipment adjustment would best address this situation?
Answer: Switch to a simple face mask at 6 L/min to ensure oxygen delivery regardless of breathing pattern preferences
When you encounter oxygen therapy questions involving patients who mouth-breathe, focus on matching the delivery method to the patient's actual breathing pattern rather than trying to force a change in their natural behavior.
Answer D is correct because a simple face mask at 6 L/min delivers oxygen regardless of whether the patient breathes through their nose or mouth. Since this patient primarily mouth-breathes during sleep, the nasal cannula becomes ineffective—oxygen flows into the nose but the patient isn't breathing through it. A face mask covers both the nose and mouth, ensuring oxygen delivery matches the patient's natural breathing pattern. The 6 L/min flow rate is appropriate for a simple face mask and should help address the low SpO2 of 86%.
Answer A is wrong because increasing nasal cannula flow won't help if the patient isn't breathing through their nose—you're just delivering more oxygen to the wrong place. Answer B suggests a partial rebreather mask, but this delivers unnecessarily high oxygen concentrations and requires higher flow rates that aren't needed for this situation. Answer C attempts to force the patient to change their breathing pattern with a chin strap, but this is uncomfortable during sleep and fights against the patient's natural physiology rather than accommodating it.
For CPCT/A oxygen therapy questions, remember this key principle: match the delivery device to how the patient actually breathes, not how you think they should breathe. Comfort and compliance are essential for effective overnight therapy.
- While setting up suction equipment in the ICU, the CPCT/A notices that the collection canister contains approximately 200 mL of bloody secretions from the previous patient. The canister capacity is 800 mL, and a new patient requiring frequent suctioning is being admitted. What is the most appropriate action regarding the collection canister?
Answer: Empty and replace the canister since cross-contamination prevention requires fresh equipment for each new patient assignment
Infection control principles require using clean equipment for each new patient to prevent cross-contamination. The canister must be emptied and replaced regardless of volume remaining. Choice B violates basic infection control by exposing the new patient to previous patient's secretions. Choice C is inappropriate and doesn't address contamination concerns. Choice D fails to follow standard precautions for preventing healthcare-associated infections.
- A CPCT/A is setting up oxygen equipment for a patient who has both COPD and is currently experiencing anxiety. The order reads 'O2 at 2 L/min via NC, titrate to maintain SpO2 88-92%.' The patient's current SpO2 is 85% on room air. After applying oxygen at 2 L/min, the SpO2 increases to 94%. What adjustment should be made?
Answer: Decrease oxygen to 1 L/min to bring the SpO2 into the target range of 88-92% as ordered for this patient
For COPD patients, the target SpO2 of 88-92% is intentionally lower to prevent CO2 retention. The current SpO2 of 94% exceeds this target, so oxygen should be decreased to 1 L/min. Choice A would worsen CO2 retention risk. Choice C ignores the specific titration order and safe COPD oxygen management. Choice D provides excessive oxygen and changes the delivery method without justification.
- A CPCT/A is setting up oxygen equipment for a patient who will be ambulating in the hallway. The patient requires continuous oxygen at 3 L/min and will be walking approximately 150 feet from their room to the physical therapy department. Which equipment setup would be most appropriate for this situation?
Answer: Large wheeled oxygen tank with 25 feet of oxygen tubing to allow freedom of movement while maintaining continuous flow
For ambulation requiring continuous oxygen, a large wheeled oxygen tank provides the mobility needed while delivering the prescribed continuous flow rate. Choice A is incorrect because extension tubing that long creates safety hazards and mobility restrictions. Choice B changes the delivery method from continuous to intermittent without physician order. Choice D is unsafe due to excessive tubing length creating trip hazards and potential disconnection.
- A patient with COPD is ordered oxygen therapy at 2 L/min via nasal cannula. When setting up the equipment, the CPCT/A notices the oxygen flowmeter reads 4 L/min but the physician's order specifies 2 L/min. The patient appears comfortable and has an oxygen saturation of 96%. What is the most appropriate immediate action?
Answer: Adjust the flowmeter to 2 L/min as ordered and document the correction made to the previous incorrect setting
The CPCT/A must follow the physician's order exactly as written. Oxygen is considered a medication and must be administered at the prescribed flow rate. The correct action is to adjust to 2 L/min as ordered and document the correction. Choice A is wrong because exceeding ordered oxygen levels can cause CO2 retention in COPD patients. Choice C is unnecessary since there's a clear order to follow. Choice D is not a standard protocol and delays proper treatment.
- During setup of portable suction equipment for patient transport, the CPCT/A discovers that the battery indicator shows only 25% charge remaining. The transport to radiology is expected to take 45 minutes including waiting time. The suction unit specifications indicate 2 hours of operation at full charge. What is the most appropriate action?
Answer: Replace the portable unit with a fully charged backup device to ensure adequate suction availability throughout transport
Patient safety requires ensuring adequate suction availability throughout the entire transport period. A backup unit with full charge eliminates any risk of equipment failure. Choice A is risky because 25% of 2 hours is 30 minutes, which leaves no safety margin for unexpected delays. Choice C provides insufficient charge time and still creates risk. Choice D is unsafe because suction capability must be available whenever the patient has potential airway compromise.
- When setting up wall suction for a post-operative patient, the CPCT/A tests the system and finds that suction pressure builds up normally to 120 mmHg when the tubing is occluded, but drops to 40 mmHg when a suction catheter is attached and activated. The wall suction gauge shows normal function. What is the most likely explanation for this pressure drop?
Answer: There is a poor connection between the suction catheter and the connecting tubing, allowing air to enter the system
A significant pressure drop from 120 mmHg to 40 mmHg when attaching a catheter indicates air entering the system, most commonly from a poor connection. This prevents proper vacuum maintenance. Choice A is unlikely as manufacturing defects in catheter walls are rare. Choice B is incorrect because this degree of pressure drop is not normal. Choice C is wrong because smaller catheters would maintain pressure better, not worse.
- When setting up suction equipment for a patient with a tracheostomy, the CPCT/A notes that the previous suction pressure was set at 80 mmHg. The nurse indicates this patient requires more aggressive suctioning due to thick secretions. What is the maximum appropriate suction pressure for adult tracheostomy suctioning?
Answer: 100-120 mmHg, as higher pressures are needed for tracheostomy suctioning compared to oral suctioning procedures
For adult tracheostomy suctioning, the maximum safe pressure is 100-120 mmHg. This provides effective suctioning while preventing tissue damage. Choice B exceeds safe limits and can cause mucosal trauma and bleeding. Choice C is dangerously high and can cause severe tissue damage and cardiovascular complications. Choice D confuses chest tube suction pressures with airway suctioning and would cause immediate harm to respiratory tissues.
- While setting up wall suction for oral suctioning, the CPCT/A connects the tubing and turns the suction to 120 mmHg. When testing the suction by occluding the tubing end, no suction is felt and the pressure gauge reads zero. The wall suction outlet appears to be functioning normally. What is the most likely cause of this problem?
Answer: There is a loose connection or leak somewhere in the tubing assembly between the wall outlet and collection canister
When suction pressure reads zero despite the wall outlet functioning, the most common cause is a loose connection or leak in the tubing system. This prevents proper vacuum from building up. Choice A is incorrect because catheter size affects flow rate, not complete loss of suction. Choice B is wrong since 120 mmHg is appropriate for oral suctioning. Choice D is incorrect because an overfilled canister would show some pressure, not zero pressure.
- A patient receiving oxygen via simple face mask at 8 L/min reports feeling claustrophobic and keeps removing the mask. The physician's order states 'oxygen to maintain SpO2 >92%.' The patient's current oxygen saturation is 89% with the mask off. What equipment modification would be most appropriate?
Answer: Switch to a nasal cannula at 6 L/min to provide equivalent oxygen delivery while reducing the claustrophobic sensation
A nasal cannula at 6 L/min can provide similar oxygen delivery to a simple face mask at 8 L/min while being much more comfortable and less claustrophobic. This addresses both the patient's comfort and oxygen needs. Choice B uses a more confining mask that would worsen claustrophobia. Choice C provides lower oxygen concentration than needed. Choice D is not practical for adult patients and is primarily used in pediatric settings.
