Correct Answer: A

Rationale: The most important intervention for managing ventilator-associated pneumonia (VAP) caused by methicillin-resistant Staphylococcus aureus (MRSA) in a patient undergoing mechanical ventilation in the ICU is to start appropriate antimicrobial therapy targeting MRSA. Vancomycin or linezolid are commonly used antibiotics for MRSA infections. These medications are effective against MRSA and can help in treating the infection and preventing further complications. It is crucial to initiate antimicrobial therapy promptly once the diagnosis of VAP caused by MRSA is suspected or confirmed to improve patient outcomes. Other interventions such as bronchoalveolar lavage for diagnostic purposes, contact precautions, or antifungal therapy may be relevant but the priority is to start effective antibiotic therapy to target the specific pathogen causing the infection.

Correct Answer: B

Rationale: Opsonization is a process in the immune response where opsonins, which are proteins such as antibodies and complement proteins, bind to pathogens such as bacteria, making them more easily recognized and engulfed by phagocytic cells like macrophages and neutrophils. This coating of pathogens by opsonins enhances the efficiency of phagocytosis, helping in the elimination of pathogens from the body. Opsonins do not facilitate cell lysis, neutralize toxins, or stimulate histamine release; their main function is to tag pathogens for phagocytosis.

Correct Answer: C

Rationale: The initial action the nurse should take when faced with a situation where a patient refuses to take medication after education and explanation is to notify the physician. The physician may need to be informed so they can reassess the medication and potentially explore alternative options or make adjustments based on the patient's concerns and preferences. It is important for medical decisions to be made in collaboration with the healthcare team to ensure the best care for the patient. Consulting the physician also helps in avoiding any potential negative outcomes resulting from the patient's refusal to take the prescribed medication. Once the physician is aware, further actions can be discussed and implemented to address the patient's concerns.

Correct Answer: B

Rationale: Gingivitis is a dental condition characterized by inflammation and bleeding of the gingival tissues. It is often caused by poor oral hygiene leading to the accumulation of bacterial plaque along the gumline. The plaque contains bacteria that release toxins, leading to inflammation of the gums. If left untreated, gingivitis can progress to periodontitis, a more serious condition that affects the supporting structures of the teeth. Regular dental cleanings, proper oral hygiene practices, and professional treatment can help manage and prevent gingivitis.

Correct Answer: C

Rationale: Nurse Gina has to consider that most of the elderly are dependent on others financially. This is an important factor to take into account when planning and providing care for elderly patients. Many elderly individuals rely on financial assistance from family members, government programs, or retirement funds. Understanding the financial status of elderly patients helps nurses like Gina provide adequate care and support to meet their needs effectively. This can involve coordinating with social services or financial assistance programs to ensure that the patients' financial concerns are addressed along with their healthcare needs.