As the RN, you know that the best diagnostic test to determine if a patient has hypoxemia is which of the following?

A. Leave the patient to get the respiratory therapist: Leaving the patient without an airway is dangerous and can result in hypoxia or cardiac arrest within minutes. The nurse must remain with the patient, call for help, and begin manual ventilation immediately to maintain oxygenation.

B. Provide adjunct oxygenation by manually ventilating patient with a bag mask valve and 100% oxygen: When a patient self-extubates, restoring oxygenation is the highest priority. Using a bag-valve mask with 100% oxygen supports ventilation until the airway can be resecured, preventing rapid desaturation and hypoxemia.

C. Check patient’s blood pressure first: While vital signs are important, assessing and maintaining the airway takes precedence over circulatory assessment. Airway and breathing are addressed before circulation in all emergency situations according to the ABC priorities.

D. Lay patient’s bed flat: Laying the bed flat may increase aspiration risk and make manual ventilation more difficult. Keeping the head of the bed elevated or in a neutral position allows for easier airway access and promotes better ventilation.

A. He has acute respiratory failure on top of chronic respiratory failure (acute on chronic respiratory failure): The patient has a history of COPD, which can lead to baseline chronic respiratory compromise. The acute onset of cough, fever, shortness of breath, and SpO2 of 80% indicates a sudden worsening of gas exchange on top of chronic insufficiency.

B. Hypercapnic respiratory failure: While COPD patients are at risk for hypercapnic respiratory failure (elevated CO2), the key feature here is acute decompensation on a background of chronic disease, which encompasses hypoxemia and possibly hypercapnia.

C. An allergic reaction to a medication: Allergic reactions typically present with rash, swelling, or airway obstruction rather than fever, productive cough, and hypoxemia. This does not fit the patient’s presentation.

D. Heart failure: While heart failure can cause shortness of breath and hypoxemia, the presence of fever, cough, and a known COPD history makes an acute pulmonary process on top of chronic lung disease more likely than acute heart failure in this context.