Which assessment finding for a client receiving oxygen therapy with a nonrebreather mask requires the nurse to intervene immediately?
The oxygen flow rate is set at 12 L/min.
The exhalation ports are open during exhalation.
The exhalation ports are closed during inhalation.
The reservoir bag is not inflated during inhalation.
The Correct Answer is D
A. This flow rate is within the normal range (10–15 L/min) for a nonrebreather mask, which is sufficient to maintain partial inflation of the reservoir bag and deliver high-concentration oxygen.
B. This is normal function. The exhalation ports allow carbon dioxide to escape during exhalation while preventing rebreathing of exhaled air.
C. This is expected and appropriate. Closing the exhalation ports during inhalation ensures the patient draws oxygen from the reservoir bag rather than room air.
D. A collapsed bag indicates that the patient is not receiving adequate high-concentration oxygen, which can quickly lead to hypoxemia and respiratory compromise. Causes may include low oxygen flow, a loose mask, or tubing obstruction. Immediate intervention is required to check the oxygen source, ensure proper mask fit, inspect tubing for kinks or disconnections, and monitor oxygen saturation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Septicis correct because an abscessed tooth is a localized bacterial infection. If untreated, bacteria can enter the bloodstream and lead to systemic infection and sepsis. Sepsis can progress to septic shock, which is characterized by widespread vasodilation, increased capillary permeability, hypotension, and poor tissue perfusion. A dental abscess is a known source of bacteremia and systemic infection.
B. Obstructiveis incorrect because obstructive shock occurs when there is a physical obstruction to blood flow, such as in pulmonary embolism, cardiac tamponade, or tension pneumothorax. An abscessed tooth does not cause mechanical obstruction of circulation.
C. Cardiogenicis incorrect because cardiogenic shock results from the heart’s inability to pump effectively, often due to myocardial infarction or severe heart failure. There is no indication of cardiac pump failure related to a dental abscess.
D. Hypovolemicis incorrect because hypovolemic shock occurs due to significant blood or fluid loss, such as hemorrhage, vomiting, diarrhea, or burns. An abscess does not directly cause volume depletion.
Correct Answer is D
Explanation
A. This is incorrect.
B. This is incorrect.
C. This is incorrect.
D. Step 1: Convert the patient’s weight from pounds to kilograms
Weight (kg) = 198 ÷ 2.2
Weight (kg) ≈ 90 kg
Step 2: Calculate the Heparin drip rate in units/hr
Drip rate (units/hr) = 16 units/kg/hr × 90 kg
Drip rate = 1,440 units/hr
Step 3: Determine the concentration of the Heparin bag
Concentration = 12,500 units ÷ 250 mL
Concentration = 50 units/mL
Step 4: Calculate the flow rate in mL/hr
Flow rate (mL/hr) = Drip rate ÷ Concentration
Flow rate = 1,440 ÷ 50
Flow rate = 28.8 mL/hr
Step 5: Match the calculated flow rate to the options
28.8 mL/hr
Final Answer: D. 28.8 mL/hr
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