Correct Answer: B

Rationale: A Venturi mask is the most appropriate choice for delivering a precise amount of oxygen to a client with dyspnea. Unlike other oxygen delivery devices, the Venturi mask allows for accurate oxygen concentration delivery by controlling the amount of air entrained. This feature is crucial in ensuring the client receives the prescribed oxygen concentration, especially in cases where precise oxygen delivery is required.

Correct Answer: C

Rationale: A client who was vaccinated for pneumococcus and influenza 6 months ago would have a reduced risk of developing pneumonia compared to those who have not been vaccinated. Vaccination helps protect individuals from specific pathogens, thereby lowering the risk of infection. Clients with dysphagia, AIDS, or a closed head injury and receiving ventilation are at higher risk for pneumonia due to compromised immunity, respiratory function, or protective airway reflexes, respectively.

Correct Answer: B

Rationale: Avocados contain high levels of tyramine, which can cause a hypertensive crisis when consumed with phenelzine, a monoamine oxidase inhibitor (MAOI). It is essential for clients taking MAOIs to avoid foods rich in tyramine to prevent dangerous interactions and potential health risks.

Correct Answer: B

Rationale: After a thoracentesis, some expected complications include dyspnea, fever, and hypotension. Localized bloody drainage on the dressing is a common and expected finding post-thoracentesis due to the procedure's nature of puncturing the chest wall.
Therefore, the healthcare provider should not consider this finding as a risk for complications.

Correct Answer: B

Rationale: When assessing a client with a history of asthma, the nurse should identify environmental allergies as a risk factor for asthma. Environmental allergens such as pollen, dust mites, mold, and pet dander can trigger asthma symptoms and exacerbate the condition. Gender, alcohol consumption, and other factors may not directly contribute to the development or exacerbation of asthma.