Correct Answer: A

Rationale: Wearing a mask is an essential infection control measure to prevent the spread of respiratory illnesses, including COVID-19. By wearing a mask, Nurse Emma can reduce the risk of inhaling or exhaling respiratory droplets that may contain infectious particles, thus helping to protect herself and the family members she is visiting. Masks are particularly crucial when interacting with individuals who are sick or when physical distancing may be challenging. While using gloves, face shields, and gowns are also important infection control measures in certain situations, wearing a mask is the most relevant and effective measure during a home visit to prevent respiratory transmission of infections.

Correct Answer: C

Rationale: When Nurse Maris is estimating the proportion of the population affected by the problem, she is assessing the magnitude of the problem. The magnitude criterion involves determining the extent of the issue within the community, such as the number of individuals affected or at risk. By understanding the magnitude of a health problem, nurses can better prioritize their efforts to address the most pressing issues that affect a large portion of the population. This criterion helps in identifying which health problems have the highest impact and require immediate attention in order to improve community health outcomes.

Correct Answer: C

Rationale: In a patient with ARDS who is experiencing refractory hypoxemia despite maximal ventilatory support and prone positioning, the use of extracorporeal membrane oxygenation (ECMO) is a potentially life-saving adjunctive therapy. ECMO works by providing temporary support for gas exchange outside the body, allowing the lungs to rest and heal while providing adequate oxygenation and carbon dioxide removal. The use of ECMO has been associated with improved oxygenation and reduced mortality in severe cases of ARDS, especially in patients who fail conventional therapies. High-frequency oscillatory ventilation (HFOV) has not consistently shown mortality benefit in ARDS, continuous renal replacement therapy (CRRT) is not directly indicated for hypoxemia in ARDS, and inhaled nitric oxide (iNO) has shown limited benefit in improving oxygenation in ARDS without a clear impact on mortality.

Correct Answer: D

Rationale: While urinalysis can provide valuable information about a person's health status and can be part of a clinical assessment, it is not typically considered a common screening test for specific diseases or conditions. The other options listed - Pap smears for cervical cancer screening, cholesterol levels for heart disease screening, and PSA levels for prostate cancer screening - are all commonly used screening tests aimed at early detection of specific diseases. Urinalysis is more commonly used as part of a broader health assessment or diagnostic evaluation rather than a dedicated screening tool for a specific condition.

Correct Answer: A

Rationale: Urinary tract infections are strongly associated with the occurrence of preterm labor. It is important to screen for and address any urinary tract infections during pregnancy to reduce the risk of complications like preterm labor. Diagnostic procedures, such as obtaining a urine sample for testing, help healthcare providers identify and treat any infections promptly to promote a healthy pregnancy. Therefore, the nurse can explain to Patient Presley that the diagnostic procedure is necessary to detect and address any potential urinary tract infections that could impact her pregnancy.