The nurse is explaining to a patient how ACE inhibitors affect blood pressure. Which statement accurately describes the action of these medications?
They lower heart rate.
They inhibit vasoconstriction.
They increase aldosterone secretion.
They promote sodium retention.
The Correct Answer is B
Choice A reason: ACE inhibitors do not lower heart rate. They lower blood pressure by blocking the conversion of angiotensin I to angiotensin II, which is a potent vasoconstrictor. Beta blockers are the drugs that lower heart rate and blood pressure.
Choice B reason: ACE inhibitors inhibit vasoconstriction. This is the correct statement that describes the action of these medications. By blocking the angiotensin II formation, they prevent the narrowing of the blood vessels and reduce the resistance to blood flow.
Choice C reason: ACE inhibitors do not increase aldosterone secretion. They decrease it. Aldosterone is a hormone that causes the kidneys to retain sodium and water, which increases blood volume and pressure. By blocking the angiotensin II formation, ACE inhibitors reduce the stimulation of aldosterone secretion and promote sodium and water excretion.
Choice D reason: ACE inhibitors do not promote sodium retention. They promote sodium excretion. As explained above, ACE inhibitors reduce the aldosterone secretion and prevent the kidneys from reabsorbing sodium and water. This lowers the blood volume and pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Decreased cardiac output would result in a decrease in blood pressure, not an increase. Cardiac output is the amount of blood pumped by the heart per minute.
Choice B reason: Decreased vascular resistance would also result in a decrease in blood pressure, not an increase. Vascular resistance is the force that opposes the blood flow in the blood vessels.
Choice C reason: Hypovolemia would also result in a decrease in blood pressure, not an increase. Hypovolemia is the condition of having low blood volume due to fluid loss or dehydration.
Choice D reason: Vasoconstriction would result in an increase in blood pressure. Vasoconstriction is the narrowing of the blood vessels, which increases the vascular resistance and the blood pressure.
Correct Answer is B
Explanation
Choice A reason: Respiratory acidosis does not cause no change in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is known as the Bohr effect, which is a physiological response to low pH and high CO2 levels.
Choice B reason: Respiratory acidosis causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is the correct statement that describes the expected finding in this patient. The decrease in affinity of hemoglobin with oxygen is a compensatory mechanism that tries to restore the oxygen balance in the body.
Choice C reason: Respiratory acidosis does not cause an increase in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. An increase in affinity of hemoglobin with oxygen would mean that hemoglobin holds on to oxygen more tightly, which would worsen the hypoxia in the patient.
Choice D reason: Respiratory acidosis does not cause a decrease in blood CO2. It causes an increase in blood CO2, which is the primary cause of the low pH. A decrease in blood CO2 would indicate respiratory alkalosis, which is a condition of high pH and low CO2 levels.
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