Critical Care Nursing Practice Questions

Correct Answer: C

Rationale: The correct answer is C (10 to 20 mg/dL). The normal BUN-to-creatinine ratio is approximately 10:1. With a serum creatinine level of 0.7 mg/dL, the expected BUN level should be around 7 to 14 mg/dL. Therefore, choice C (10 to 20 mg/dL) falls within this expected range. Choices A, B, and D are incorrect as they do not align with the typical BUN-to-creatinine ratio and would indicate abnormal kidney function.

Correct Answer: C

Rationale: The correct answer is C because the SUPPORT study revealed disparities between patients' care preferences and the actual care provided. This is supported by the findings that many patients did not receive treatments aligned with their preferences. Choice A is incorrect because the study actually highlighted communication challenges between patients and healthcare providers. Choice B is incorrect as the study showed that critical care units often do not meet the needs of dying patients and their families. Choice D is incorrect as the study found that pain and suffering of patients at the end of life are not always well controlled in hospitals.

Correct Answer: C

Rationale: The correct answer is C: Taking all asthma medications as prescribed. This is the most appropriate action to prevent exacerbation of asthma symptoms. By taking medications as prescribed, the patient can effectively manage and control their asthma, reducing the risk of exacerbation. Following the prescribed medication regimen helps to keep inflammation in check and maintain airway function. Choice A is incorrect because while follow-up appointments are important, they do not directly prevent exacerbation. Choice B is incorrect as limiting activity may not address the underlying cause of exacerbation. Choice D is incorrect as taking medications on an "as needed" basis may not provide consistent control of asthma symptoms, leading to potential exacerbation.

Correct Answer: D

Rationale: The correct answer is D: Richmond Agitation Sedation Scale (RASS). RASS is specifically designed to monitor agitation and sedation levels in critically ill patients, providing a standardized and objective assessment. It includes clear descriptors for different levels of agitation and sedation, allowing for consistent monitoring and treatment adjustments. CAM-ICU is mainly used for delirium assessment, not agitation. FACES assessment tool is more appropriate for pain assessment. Glasgow Coma Scale is focused on assessing level of consciousness, not agitation specifically. By using RASS, healthcare providers can accurately track agitation levels and evaluate the effectiveness of interventions in managing agitation in critically ill patients.

Correct Answer: B

Rationale: Certainly. Hypovolemia, or low blood volume, can lead to low cardiac output and cardiac index because the heart has less blood to pump, resulting in reduced circulation. Exercise typically increases cardiac output to meet increased demand. Myocardial infarction may reduce cardiac output temporarily, but not consistently. Shock, a condition where the body's tissues do not receive enough oxygen and nutrients, can lead to low cardiac output, making it a possible cause.