Which of the following best describes the primary physiological role of B-type natriuretic peptide (BNP) in the regulation of cardiovascular function?

BNP promotes the synthesis of angiotensin II to enhance fluid retention and increase blood pressure.

BNP increases heart rate and cardiac contractility to enhance cardiac output.

BNP increases blood pressure by causing vasoconstriction and stimulating aldosterone release.

BNP decreases blood pressure by causing vasodilation and promoting sodium and water excretion.

Answer and Explanation

The Correct Answer is D

A. BNP does not promote the synthesis of angiotensin II; instead, it counteracts the effects of the renin-angiotensin-aldosterone system (RAAS) by reducing fluid retention and blood pressure, which is the opposite of what angiotensin II does.
B. BNP does not increase heart rate or cardiac contractility. Its role is primarily in reducing cardiac workload by lowering blood pressure and decreasing fluid volume.
C. BNP does not increase blood pressure; rather, it acts to decrease it by causing vasodilation and inhibiting the effects of aldosterone, which would otherwise increase blood pressure by promoting sodium and water retention.
D. BNP decreases blood pressure by causing vasodilation and promoting the excretion of sodium and water, which reduces blood volume and, consequently, lowers the blood pressure. This is its primary role in cardiovascular regulation, especially in response to heart failure.

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Correct Answer is D

Explanation

A. "Water moves from areas where the concentration of sodium is higher to areas where the concentration is lower.": This statement incorrectly describes the direction of water movement. Water typically moves towards areas of higher solute concentration (higher sodium levels) through osmosis.

B. "Sodium moves from areas where the concentration of solute is lower to areas where the concentration is higher.": Sodium does not move this way in dehydration; the main issue is the movement of water, not sodium, in response to osmotic gradients.

C. "Water and sodium particles move together to areas where sodium particles are higher.": Water and sodium do not move together. Water follows solute (sodium) through osmotic processes, but sodium does not move in this manner during dehydration.

D. "Water moves from areas where the concentration of sodium is lower to the areas where the concentration of sodium is higher.": This statement correctly explains the principle of osmosis. In dehydration, water is lost from the body, leading to higher sodium concentration in the blood. This higher concentration draws water from cells to balance the osmotic pressure, resulting in elevated sodium levels.

A. Apply positive pressure ventilation and provide supportive care with pain management. B. Perform needle decompression of the pleural space followed by chest tube insertion. C. Administer intravenous antibiotics and arrange for an elective surgical repair. D. Provide high-flow oxygen and intubate the patient for mechanical ventilation.

Correct Answer is B

Explanation

A. Apply positive pressure ventilation and provide supportive care with pain management: While supportive care is important, positive pressure ventilation may not be sufficient to address the underlying issue, which is likely a pneumothorax or hemothorax.
B. Perform needle decompression of the pleural space followed by chest tube insertion: This is the most appropriate initial management for a patient with paradoxical chest wall movement, which is a sign of flail chest and likely pneumothorax. Needle decompression can relieve pressure in the pleural space, and chest tube insertion can help drain any fluid or air that has accumulated.
C. Administer intravenous antibiotics and arrange for an elective surgical repair: While infection may be a concern, it is not the most immediate priority in this case. The patient's respiratory distress needs to be addressed first.
D. Provide high-flow oxygen and intubate the patient for mechanical ventilation: While oxygen therapy may be necessary, intubation should be considered as a last resort if other measures fail to improve oxygenation. In this case, needle decompression and chest tube insertion are more likely to be effective in improving respiratory function.

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Which of the following best describes the primary physiological role of B-type natriuretic peptide (BNP) in the regulation of cardiovascular function?

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Naxlex Comprehensive Predictor Exams

A charge nurse is reinforcing teaching with a newly licensed nurse about fluid shifts. The newly licensed nurse asks why sodium levels are high during dehydration. Which of the following responses should the charge nurse provide?

Correct Answer is D

Explanation

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Correct Answer is B

Explanation

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