Correct Answer: B

Rationale: The correct answer is B because calibrating the system with central venous and arterial blood samples ensures accuracy of the mixed venous oxygen saturation (SvO2) measurement. This calibration allows for comparison of the values obtained from both sources to confirm the accuracy of the measurement. Choice A is incorrect because zero referencing the transducer at the level of the phlebostatic axis does not directly address the accuracy of the SvO2 measurement. Choice C is incorrect because ensuring patency of the catheter using normal saline pressurized at 300 mm Hg does not directly impact the accuracy of the SvO2 measurement. Choice D is incorrect because using noncompliant pressure tubing does not ensure the accuracy of the SvO2 measurement. The length of the tubing and the presence of stopcocks are not directly related to obtaining an accurate SvO2 value.

Correct Answer: B

Rationale: The correct answer is B because calibrating the system with central venous and arterial blood samples ensures accuracy of the mixed venous oxygen saturation (SvO2) measurement. This calibration allows for comparison of the values obtained from both sources to confirm the accuracy of the measurement. Choice A is incorrect because zero referencing the transducer at the level of the phlebostatic axis does not directly address the accuracy of the SvO2 measurement. Choice C is incorrect because ensuring patency of the catheter using normal saline pressurized at 300 mm Hg does not directly impact the accuracy of the SvO2 measurement. Choice D is incorrect because using noncompliant pressure tubing does not ensure the accuracy of the SvO2 measurement. The length of the tubing and the presence of stopcocks are not directly related to obtaining an accurate SvO2 value.

Correct Answer: D

Rationale: The correct answer is D because the vision of the American Association of Critical-Care Nurses focuses on creating respectful, healing, and humane environments. This aligns with the core values of nursing, emphasizing compassion, dignity, and patient-centered care. A is incorrect as the focus is not solely on the work environment. B is incorrect as it emphasizes the role of physicians over the collaborative approach advocated by the AACN. C is incorrect as it only addresses meeting patient needs, whereas the vision encompasses a broader scope of creating healing environments.

Correct Answer: B

Rationale: The correct answer is B: Caring practices. In this situation, the patient and her husband are dealing with complex medical conditions and emotional distress. Caring practices involve providing compassionate, empathetic, and supportive care to the patient and her family members during this difficult time. The nurse needs to show sensitivity, understanding, and emotional support to help them cope with their situation. Clinical judgment (A) is important but not the primary focus in this scenario. Collaboration (C) is essential in the interdisciplinary team, but caring practices take precedence in addressing the emotional needs. Response to diversity (D) is also important, but in this case, the focus is more on providing compassionate care rather than addressing cultural or social diversity issues.

Correct Answer: A

Rationale: The correct answer is A because breastfeeding helps stimulate the uterus to contract, which reduces the risk of postpartum hemorrhage in the mother. When the baby suckles at the breast, it triggers the release of oxytocin, a hormone that causes the uterus to contract. This contraction helps the uterus to return to its pre-pregnancy size and shape, promoting faster healing and reducing bleeding. Choice B is incorrect because lactation initiation is a separate process that involves hormonal changes and milk production, which may not occur immediately after delivery. Choice C is incorrect as bonding can occur through various interactions beyond breastfeeding. Choice D is incorrect as neonatal hypoglycemia is primarily prevented by ensuring the baby receives adequate nutrition, which can also be achieved through other feeding methods besides breastfeeding.