Correct Answer: A

Rationale: In this situation, the priority action is to provide high-flow oxygen to the client. Sudden onset dyspnea and severe chest pain can be indicative of a pulmonary embolism, which is a life-threatening emergency. Oxygen therapy helps improve oxygenation and stabilizes the client's condition. Checking for Chvostek's sign, administering IV vasopressors, or monitoring for a headache are not the immediate priorities in this critical situation.

Correct Answer: A

Rationale: Cheyne-Stokes respirations are characterized by a pattern of breathing that ranges from very deep to very shallow with periods of apnea (temporary cessation of breathing). This pattern is often seen in clients near the end of life or with certain medical conditions affecting the respiratory control center in the brain. The alternating deep and shallow breaths can be distressing for both the client and caregivers. It is crucial for the nurse to recognize this pattern to provide appropriate care and support to the client and their family during this challenging time.

Correct Answer: C

Rationale: In the scenario of a pulmonary embolism, the priority medication to administer is Heparin. Heparin is an anticoagulant that helps prevent the formation of new blood clots and the growth of existing ones, which is crucial in managing pulmonary embolism. Furosemide is a diuretic used to treat fluid retention, Dexamethasone is a corticosteroid used for inflammation, and Atropine is an anticholinergic medication used for various purposes such as treating bradycardia.

Correct Answer: B

Rationale: In a client with a high respiratory rate, low PaO2, and low SaO2, the priority intervention is to improve oxygenation. Administering oxygen via a face mask will help increase the oxygen supply to the client's lungs and tissues, addressing the hypoxemia. While mechanical ventilation may be necessary in severe cases, administering oxygen is the initial and most appropriate intervention to address the client's respiratory distress. Sedatives should not be given without ensuring adequate oxygenation. Assessing for pulmonary embolism is important but not the priority at this moment when the client is experiencing respiratory distress and hypoxemia.

Correct Answer: C

Rationale: During an asthma attack, hypoxemia can lead to inadequate oxygen supply to the brain, causing symptoms like restlessness, confusion, and agitation. These manifestations result from the body's response to low oxygen levels, aiming to increase oxygenation. Nausea, dysphagia, and hypotension are not typical manifestations of hypoxemia during an asthma attack.